Entries |
Document | Title | Date |
20080225560 | SWITCHING CONTROLLER FOR PARALLEL POWER CONVERTERS - A switching controller for parallel power converters is disclosed. The switching controller includes an input circuit coupled to an input terminal of the switching controller to receive an input signal. An integration circuit is coupled to the input circuit to generate an integration signal in response to the pulse width of the input signal. A control circuit generates a switching signal for switching the power converters. The switching signal is enabled in response to the enabling of the input signal. A programmable delay time is generated between the input signal and the switching signal. The pulse width of the switching signal is determined in response to the integration signal. | 09-18-2008 |
20080259661 | Control Process for Redundancy Use in the Event of a Fault of a Polyphase Power Converter Having Distributed Energy Stores - The invention relates to a method for controlling a power converter having at least two phase modules, which each have an upper and a lower valve branch, each having at least three series-connected two-pole subsystems, in the event of failure of at least one subsystem of a valve branch of a phase module. According to the invention, the valve branch (TI, T | 10-23-2008 |
20080278980 | DC-AC converter with fast response speed - An exemplary direct current to alternating current converter includes a pulse width modulator having a plurality of pulse signal outputs that can provide a plurality of pulse signals, a driving circuit having a plurality of switching units, and a transformation circuit having a plurality of transformers. Each of the switching units includes a P-type transistor and an N-type transistor. Each pulse signal output is electrically connected to the P-type and N-type transistors of one of the switching units. Each of the transformers is connected to two of the switching units, and the P-type transistors and the N-type transistors of the two switching units are not switched on simultaneously. | 11-13-2008 |
20090034303 | DISCONTINUOUS PULSE WIDTH MODULATION FOR DOUBLE-ENDED INVERTER SYSTEM - Systems and methods are provided for controlling a double-ended inverter system having a first inverter and a second inverter. The method comprises determining a required output current and determining a desired second inverter current. The method further comprises determining a second inverter switching function, wherein only a selected leg in the second inverter is modulated at a duty cycle, determining a first inverter switching function based on the second inverter switching function, and modulating the first inverter and the second inverter using the first inverter switching function and the second inverter switching function. | 02-05-2009 |
20090034304 | Inverter for grounded direct current source, more specifically for a photovoltaic generator - An inverter ( | 02-05-2009 |
20090097287 | Inverter control circuit and control method thereof - In an inverter control circuit for controlling an inverter circuit, when an analog signal from the inverter circuit is amplified and converted from analog to digital, a timing at which a gain of an amplifier is switched is securely detected, and the gain is switched. An inverter control circuit includes: a timer circuit for generating a PWM signal with which an electric conductive state of a switch device of an inverter circuit is controlled; an amplifier for amplifying and outputting an analog signal generated with a load electric current of the inverter circuit; and a gain control circuit for controlling the switching of the gain of the amplifier in synchronization with an output change timing of the PWM signal. | 04-16-2009 |
20090147554 | PARALLEL CONNECTED INVERTERS - A distributed power system wherein a plurality of power converters are connected in parallel and share the power conversion load according to a prescribed function, but each power converter autonomously determines its share of power conversion. Each power converter operates according to its own power conversion formula/function, such that overall the parallel-connected converters share the power conversion load in a predetermined manner. | 06-11-2009 |
20090185400 | PARALLEL INVERTER SYSTEM - A parallel inverter system needs neither a dedicated line for synchronizing common portions nor switching operations, and includes a plurality of inverter units operating in parallel. An inverter control circuit of each inverter unit includes a sinusoidal signal generating circuit, a PWM control signal generating circuit, a phase difference circuit, a frequency difference circuit, and a feedback circuit. The feedback circuit inputs to the sinusoidal signal generating circuit an addition result value which is obtained by adding to a commanded value for reference frequency a value obtained from multiplication of a phase difference by a predetermined gain and a value obtained from multiplication of a frequency difference by a predetermined gain. The phase difference among outputs from the inverter units occurring in the parallel operation of the inverter units is reduced by changing the output frequencies of the inverter units. (140 word) | 07-23-2009 |
20090251933 | METHOD FOR CONTROLLING INVERTERS - The invention relates to a method for controlling the voltage and power of several HF inverters ( | 10-08-2009 |
20090296434 | High efficiency, multi-source photovoltaic inverter - A photovoltaic (PV) inverter system operates continuously in a buck converter mode to generate a sum of full wave rectified sine wave currents at a current node common to a plurality of buck converters in response to a plurality of full wave rectified sine wave currents generated via the plurality of buck converters. The PV inverter system increases the level of the voltage sourcing each buck converter when a corresponding DC power source voltage is lower than the instantaneous voltage of a utility grid connected to the PV inverter system. | 12-03-2009 |
20090310390 | ELECTRICAL POWER SOURCE, OPERATIONAL METHOD OF THE SAME, INVERTER AND OPERATIONAL METHOD OF THE SAME - The present invention is an electric power source in which a plurality of inverters operate on the same frequency and the plurality of inverters are connected in parallel so that a resistance value expressed by (1−β·G)/(α·G) where α is the output voltage feedback gain, β is the output current feed forward gain, and G is the inverter current gain, is made to be the equivalent output impedance; and is an electrical power source in which the cross-current between the inverters are made to be an acceptable value or below by adjusting the output of each of the inverters by controlling the equivalent output impedance by modifying both or either one of the output voltage feedback gain α or the output current feed forward gain α. | 12-17-2009 |
20100165678 | SYSTEM FOR CONVERTING AT LEAST ONE ELECTRICAL INPUT DIRECT CURRENT INTO AN ELECTRICAL POLYPHASE OUTPUT ALTERNATING CURRENT - A system for converting at least one electrical input direct current into an electrical output alternating current comprising M phases and supplied to M output terminals includes N polyphase inverters, connected in parallel, each converting the input direct current into an intermediate alternating current comprising M phases and supplied to M intermediate terminals; N×M first electromagnetic coupling coils, each being connected to a respective intermediate terminal; N×M magnetic cores, each first coil being wound around a respective core. | 07-01-2010 |
20100177540 | POWER CONVERSION APPARATUS - In a power conversion apparatus that boosts a solar light voltage, converts it to AC and supplies AC power to a load or system, power loss is reduced and efficiency is improved. An inverter unit, in which AC sides of three single-phase inverters receive DC power from respective sources with a voltage ratio of 1:3:9 as respective inputs are connected in series. Gradational output voltage control of an output voltage is carried out using the sum of the respective generated AC voltages. Also, a solar light voltage is boosted by a chopper circuit to generate the highest voltage DC power source. When the solar light voltage exceeds a predetermined voltage, the boosting of the chopper circuit is stopped, thereby reducing power loss due to the boosting. | 07-15-2010 |
20100254171 | Medium Voltage Inverter System - An inverter system for driving electrical loads such as multi-phase induction motors is disclosed utilizing five single-phase inverter cells configured in a wye configuration. Inverter cells such as neutral-point-clamp inverter cells are configured to generate a voltage waveform between two output terminals and further configured with a terminal providing a neutral voltage reference point with respect to each of the two output terminals. The inverter cells may be configured with the neutral voltage reference points connected together and with one output terminal from each inverter cells connected together to provide three outputs of the inverter system at different voltage phases and with the common neutral reference point as the wye connection of the three outputs. The other three single phase inverter cells may be added to each of the three outputs to boost the output voltage of the inverter system and decrease the maximum voltage requirements on each inverter cell. | 10-07-2010 |
20100284205 | Voltage Transforming Apparatus - A voltage transforming apparatus includes a first high voltage side coil, a first low voltage side coil magnetically coupled to the first high voltage side coil, a second low voltage side coil magnetically coupled to the first high voltage side coil, and a first switch switching an externally supplied voltage between being supplied to the first low voltage side coil and the second low voltage side coil and being supplied to the first high voltage side coil. The first low voltage side coil and the second low voltage side coil are provided such that a magnetic flux that is generated by current flowing through the first low voltage side coil and a magnetic flux that is generated by current flowing through the second low voltage side coil cancel each other out when a voltage is supplied via the first switch. | 11-11-2010 |
20100290258 | Inverter Topology For Improved Efficiency And Reduced Harmonic Distortion - An inverter circuit for generating an AC signal from a DC input is described herein. The inverter comprises a primary inverter for generating a first portion of a signal, the primary inverter using switches that when actuated efficiently produce the first portion of the signal, the first portion of the signal being an approximation of a sine wave, the approximation of the sine wave having an error component; a secondary inverter for generating a second portion of the signal, the secondary inverter using switches to produce a waveform that that attenuates the error component of the first portion of the signal; and combining means such as a transformer which combine the first and second portions of the generated signal to produce a substantially improved approximation of a sine wave. An inverter circuit may further comprise: a filter connected to the transformer for smoothing a residual carrier frequency from the secondary portion of the signal; wherein the filter comprises a rectifier connected to the DC input of the primary inverter. | 11-18-2010 |
20110075455 | DC-AC Inverters - A method of operating a DC-AC inverter to produce AC power having alternating positive and negative half cycles is disclosed. The inverter includes an input connected to a DC power source, an output, a first buck converter coupled between the input and the output and a second buck converter coupled between the input and output. The method includes alternately operating the first buck converter and the second buck converter to alternately produce the positive and negative half cycles at the output. | 03-31-2011 |
20110103109 | AC POWER SOURCE APPARATUS - An AC power source apparatus includes a first AC voltage generator having a first switch set, to output a first AC voltage having a positive-negative asymmetrical waveform by turning on/off the first switch set to a first end of a load; a second AC voltage generator having a second switch set, to output a second AC voltage having a positive-negative asymmetrical waveform and a phase difference of 180 degrees with respect to the first AC voltage by turning on/off the second switch set to a second end of the load; and a control circuit to turn on/off the first switch set, and by setting a phase difference of 180 degrees with respect to the turning on/off of the first switch set, turn on/off the second switch set. A voltage across the load is an AC voltage having a positive-negative symmetrical waveform. | 05-05-2011 |
20110157934 | SELECTIVE ENABLEMENT OF POWER SUPPLY SECTIONS FOR IMPROVING EFFICIENCY - Systems and methods are disclosed for maximizing the efficiency of a power supply according to the value of a load to be powered. One embodiment provides a power supply system including a first and second stage. The first stage has at least one AC to DC conversion section for converting an AC input to DC at an upper DC voltage value. The second stage has at least one DC to DC regulation section for converting at least a portion of the DC at the upper DC voltage value to DC at a lower DC voltage value and supplying the lower DC voltage value to a DC output. One or both of the first and second stages includes more than one section operating in parallel. A controller selectively enables a selected combination of the AC to DC conversion sections and the DC to DC regulation sections according to an expected or actual value of the load. | 06-30-2011 |
20110194319 | ALTERNATING CURRENT POWER SUPPLY DEVICE AND METHOD OF CONTROLLING SAME - An alternating current power supply device comprises a DC power supply for generating direct current power, a plurality of, e.g., three first DC/AC inverter to third DC/AC inverter which are arranged in parallel and electrically connected to the DC power supply, for converting the direct current power generated by the DC power supply into alternating current power and supplying the alternating current power to a load, and a control unit for controlling the driving of the first DC/AC inverter to the third DC/AC inverter. The capacitance A of the first DC/AC inverter is set to W/6, the capacitance A of the second DC/AC inverter is set to W/3, and the capacitance A of the third DC/AC inverter is set to W/2. | 08-11-2011 |
20110216561 | Low-Inductance Power Semiconductor Assembly - A power semiconductor assembly includes at least two bridge branches each including at least two circuit breakers connected to a phase output. Each of the circuit breakers has at least two parallel-connected switching elements integrated into a semiconductor chip. Each of the circuit breakers is arranged in a power semiconductor module and the individual power semiconductor modules are arranged adjacent to one another in a first direction. The semiconductor chips of a particular circuit breaker are arranged adjacent to one another in the corresponding power semiconductor module in a second direction extending perpendicular to the first direction. | 09-08-2011 |
20110216562 | DC-TO-DC POWER CONVERSION - This disclosure includes systems and methods for managing the interaction between inverter-based DC and other power systems. In one embodiment, a 3-phase isolation transformer is fluxed to create a 3-phase rotating field from the output of a source inverter. An inductive filter turns that output into three sine waves. A secondary inverter regenerates the system, sometimes after the isolation transformer is fluxed, and by advancing or retarding the secondary inverter's phase, current (and, thus, the DC voltage and power direction) is controlled. In another embodiment, an inverter is supplied by a DC source. The inverter is controlled to match its output voltage, current, and phase to a live AC grid, then the two are connected. The inverter frequency is then driven to advance the phase of the inverter in relation to the grid. Alternatively, the inverter voltage is then driven at a level greater than that of the grid. | 09-08-2011 |
20110222323 | POWER CONVERTER WITH DISTRIBUTED CELL CONTROL - A device for converting a DC voltage into an AC voltage and vice versa comprises a control system to control the voltage conversion and at least one phase leg ( | 09-15-2011 |
20110235377 | Circuit and Method for Generating an AC Voltage from a Plurality of Voltage Sources Having a Temporally Variable DC Output Voltage - A circuit comprising at least one parallel-connected partial circuit for feeding at least one inverter circuit. A partial circuit consists of an unregulated voltage source having a temporally varying DC output voltage, a voltage doubling circuit and a voltage regulating circuit with an associated regulating device. In the inventive method, the voltage doubling circuit doubles the voltage of the unregulated voltage source. The regulation of the current/voltage characteristic curve, the MPP tracking, of the unregulated voltage source is effected by the regulating device of the voltage regulating circuit. | 09-29-2011 |
20110273916 | POWER CONVERTING APPARATUS - A power converting apparatus includes a first inverter ( | 11-10-2011 |
20120002450 | BIDIRECTIONAL INVERTER FOR CONVERSION BETWEEN A DIRECT CURRENT SOURCE AND AN ALTERNATING CURRENT GRID - A bidirectional inverter is disclosed, the inverter including DC terminals and being connectable to a grid via grid AC terminals. The inverter includes a first subinverter and a second subinverter, both subinverters being connected in parallel to the DC terminals, and being connected in parallel to the grid AC terminals by subinverter AC terminals. Each subinverter includes a full bridge and a switchable freewheel path, both being configured to drive current between the grid AC terminals in a driving direction, and configured to block a current between the grid AC terminals in a blocking direction opposite the driving direction. The driving direction of the first subinverter is the blocking direction of the second subinverter. | 01-05-2012 |
20120014147 | POWER LAYER GENERATION OF INVERTER GATE DRIVE SIGNALS - Solid state switches of inverters are controlled by timing signals computed in power layer interface circuitry for individual inverters. Multiple inverters may be placed in parallel with common three-phase output. Common control circuitry generates timing signals or data used to reconstruct the common signals and sends these signals to the power layer interface circuitry. A processor in a power layer interface circuitry used these signals to recomputed the timing signals. Excellent synchronicity may be provided between parallel inverters that each separately reconstruct the timing signals based upon the identical received data. | 01-19-2012 |
20120020125 | VOLTAGE REGULATOR FOR FUEL CELL AND METHOD THEREFOR - A voltage regulator for a fuel cell and a method therefor are disclosed. Inputs of converters are connected to the fuel cell in parallel and outputs of the converters are connected between a positive terminal and a negative terminal of a load in series. The output of the fuel cell is converted by the converters and combined to output as an output voltage, which is provided to the load as a working voltage of the load. A control circuit in the voltage regulator receives a feedback signal related to the output voltage to feedback control the converters, such that each converter outputs the same constant voltage. | 01-26-2012 |
20120020126 | CONTROL DEVICE OF TRANSFORMER COUPLING TYPE BOOSTER - A control device of a transformer coupling type booster performs switching control of applying ON/OFF switching signals to the respective switching elements and alternately repeating, at a predetermined cycle, a voltage positive polarity period where an inter-terminal voltage of the low-voltage side winding and an inter-terminal voltage of a high-voltage side winding have a positive polarity, and a voltage negative polarity period where those inter-terminal voltages have a negative polarity. Upon performing the foregoing control, added is control of providing a zero voltage period between the voltage positive polarity period and the voltage negative polarity period of the inter-terminal voltage of the low-voltage side winding and the inter-terminal voltage of the high-voltage side winding in order to lower a transformer effective current value. In this case, the zero voltage period is formed between the voltage positive polarity period and the voltage negative polarity period of the inter-terminal voltage of the low-voltage side winding and the inter-terminal voltage of the high-voltage side winding by providing a phase difference between the respective switching signals to be applied to the respective switching elements of the low-voltage side inverter and providing a phase difference between the respective switching signals to be applied to the respective switching elements of the high-voltage side inverter. | 01-26-2012 |
20120069612 | ARRANGEMENT FOR EXCHANGING POWER - An arrangement for exchanging power with a three-phase electric power network includes a Voltage Source Converter having three phase legs with each a series connection of switching cells. The three phase legs are interconnected in a neutral point by forming a wye-connection. The arrangement also includes a device connected to the neutral point of the converter and configured to provide a current path for a zero-sequence current. A control unit is configured to calculate a value for amplitude and phase position for a zero-sequence current for which, when added to said three phase legs upon generation of a negative-sequence current, the resulting energy stored in energy storing capacitors in each phase leg will be constant and to control semiconductor devices of said switching cells to add such a zero-sequence current to the currents of each phase leg of the converter. | 03-22-2012 |
20120087163 | POWER SUPPLY APPARATUS - A relay contact is connected between positive power supply input terminals of first and second inverters, and a relay contact is connected between negative power supply input terminals of the inverters. A positive DC power supply terminal is connected to the positive power supply input terminal of the first inverter, and a negative DC power supply terminal is connected to the negative power supply input terminal of the second inverter. A drive unit opens or closes the relay contacts when a voltage appearing between the positive and negative DC power supply terminals is larger than a predetermined value or is not larger than the predetermined value, respectively. A diode has its anode and cathode connected to the negative power supply input terminal of the first inverter the positive power supply input terminal of the second inverter, respectively. | 04-12-2012 |
20120092908 | Multi-Level Parallel Power Converters - Multi-level power converters are disclosed. In one embodiment, a multi-level power converter includes an input for receiving an input voltage and a converter output for providing a variable output voltage. The multi-level power converter includes a plurality of switching circuits. Each switching circuit is connected to the input in parallel with each other switching circuit. Each switching circuit includes an output. Each switching circuit is selectively operable to couple its output to the input voltage or a reference voltage. The multi-level power converter includes a parallel multi-winding autotransformer (PMA). The PMA includes a plurality of windings and a magnetic core having a plurality of magnetically connected columns. Each winding is positioned around a different one of the columns and has a beginning and an end. The output of each switching circuit is coupled to the beginning of a different winding. The end of each winding is connected to the converter output in parallel with each other winding. | 04-19-2012 |
20120099353 | POWER CONVERTING APPARATUS - A power converting apparatus includes a main inverter having a high-voltage DC power supply that operates at a low frequency employing SiC MOSFETs having a high withstand voltage exceeding 600 V and a sub-inverter having a low-voltage capacitor that operates through high-frequency PWM employing Si MOSFETs having a low withstand voltage. With AC sides of the main inverter and the sub-inverter connected in series, the power converting apparatus outputs AC power having a prescribed voltage waveform by adding voltages individually generated by the main inverter and the sub-inverter. Specifically, the SiC MOSFETs are used only in the main inverter of which devices are required to have a high withstand voltage and the Si MOSFETs are used in the sub-inverter of which devices may have a relatively low withstand voltage, whereby conduction loss is reduced with an inexpensive circuit configuration. | 04-26-2012 |
20120113695 | CONTROL METHOD FOR CONVERTING POWER, AND ELECTRONIC POWER CONVERTER ADAPTED TO CARRY OUT SAID METHOD - A control method and apparatus are provided to convert a DC voltage into alternating voltage. The apparatus includes a first inverter and a second inverter to generate a first alternating voltage and a second alternating voltage, respectively. Also included is an interphase transformer to combine these alternating voltages in parallel to obtain a first resulting alternating voltage. The apparatus also includes a third inverter and a fourth inverter to generate a third and fourth alternating voltage, respectively. These are combined to form a second resulting alternating voltage. The second resulting alternating voltage is displaced in phase approximately 180° in relation to the first resulting alternating voltage. | 05-10-2012 |
20120113696 | Inverter System Having a Decoupling Switching Element - An inverter system for converting a constant output signal of an energy-generating module, e.g., a solar cell module, into an alternating current signal, includes: an input port for receiving the constant output signal, an inverter circuit connected downstream from the input port and provided for generating the alternating current signal by switching over at least one inverter circuit element, and a decoupling switching element situated between the input port and the inverter circuit. The decoupling switching element is configured to be selectively switched over immediately before the at least one inverter circuit element is switched over in order to decouple the at least one inverter circuit element from the input port at the point in time of the switch-over. | 05-10-2012 |
20120134186 | INVERTER ARRAY WITH LOCALIZED INVERTER CONTROL - An apparatus for delivering AC power to an AC load may include a plurality of inverters to receive direct current (DC) power from a respective DC power source and respectively provide AC power to an AC load. The apparatus may further include a first controller to generate a first control signal based on total AC current and total AC voltage being delivered to the AC load by the plurality of inverters. The apparatus may further include a plurality of secondary controllers to each receive the first control signal and each produce a respective secondary control signal based on the first control signal. The respective secondary control signal for each of the plurality of secondary controllers is configured to control a corresponding one of the plurality of inverters to provide a portion of the AC power. | 05-31-2012 |
20120188805 | POWER SUPPLY CONVERSION CIRCUIT OF MULTI-PHASE POWER SUPPLY - A power supply conversion circuit includes a PWM chip and many sub-circuits. Each sub-circuit includes an inductor, a first capacitor connected to ground, a first resistor connected in series with the first capacitor to form a branch parallel to the inductor, a differential pair having a first differential signal trace and a second differential signal trace, a second resistor, and a second capacitor. The first trace is connected between the connection of the first resistor and the first capacitor and the PWM chip. The second resistor is connected between the connection of the first resistor and the inductor and the second capacitor. The second trace is connected between the connection of the second resistor and the second capacitor and the PWM chip. The ratios of the capacitances of each two second capacitors are the same as that of the lengths of the traces of each two corresponding differential pairs. | 07-26-2012 |
20120218790 | POWER CONVERSION SYSTEM - A power conversion system includes n (n being an integer of 2 or more) power conversion devices (P | 08-30-2012 |
20120230072 | CIRCUIT ASSEMBLY HAVING A CONVERTER PART COMPRISING A CENTRAL CONTROL UNIT - Circuit assembly ( | 09-13-2012 |
20120262960 | SOLAR GENERATION METHOD AND SYSTEM - The invention describes a solar generation method by means of a system ( | 10-18-2012 |
20120275202 | SERIES MULTIPLEX POWER CONVERSION APPARATUS - A series multiplex power conversion apparatus includes a plurality of phases. Each of the plurality of phases includes a plurality of power conversion cells coupled in series to each other. Each of the plurality of power conversion cells includes a current detector configured to detect a current through one phase among the plurality of phases corresponding to the current detector. Each of the plurality of power conversion cells is configured to independently stop a power conversion operation based on the current detected by the current detector. | 11-01-2012 |
20120314465 | CONTACTLESS ELECTRICITY-SUPPLYING DEVICE - There is provided a contactless electricity-supplying device that can safely and efficiently supply power to a load. | 12-13-2012 |
20130016543 | DC TO AC CONVERTERAANM KU; Chen-WeiAACI TAOYUAN HSIENAACO TWAAGP KU; Chen-Wei TAOYUAN HSIEN TWAANM LEE; Lei-MingAACI TAOYUAN HSIENAACO TWAAGP LEE; Lei-Ming TAOYUAN HSIEN TW - A DC to AC converter includes a first switch, a second switch, a first half bridge inverter, and a second half bridge inverter. The first switch includes a first terminal and a second terminal. The second switch includes a first terminal and a second terminal. A portion between the first terminal of the first switch and the first terminal of the second switch is operable to receive a direct current power source. The first half bridge inverter includes a first terminal, a second terminal, and an output terminal. The second half bridge inverter includes a first terminal, a second terminal, and an output terminal. A portion between the output terminal of the first half bridge inverter and the output terminal of the second half bridge inverter is operable to output an alternative current. | 01-17-2013 |
20130021829 | ARRANGEMENT AND A METHOD FOR SUPPLYING ELECTRIC POWER - An arrangement for supplying electric power to a load through a filter bus includes at least two Voltage Source Converters connected in parallel to the filter bus through an inductor each and configured to share the load. Each converter is associated with a control unit configured to regulate the voltage (v | 01-24-2013 |
20130051094 | CASCADED FLYING CAPACITOR MODULAR HIGH VOLTAGE INVERTERS - A high voltage inverter is provided which includes a plurality of k-level flying capacitor H bridge modules, k being greater than 2, each having a positive dc terminal, a negative dc terminal, and two ac terminals, a connecting unit for connecting said ac terminals of said plurality of k-level flying capacitor H bridge modules in series to form a cascading set of modules, and a dc source connected to an ac source and having a transformer, a rectifier rectifying an output voltage of said transformer, and a capacitor connected between the positive and negative dc terminals. | 02-28-2013 |
20130063991 | VOLTAGE CONVERTER CONFIGURATIONS FOR SOLAR ENERGY SYSTEM APPLICATIONS - A system includes a low switching frequency power converter configured to be coupled to a solar cell, wherein the low switching frequency power converter is configured to generate alternating current (AC) power based on low voltage direct current (DC) power transmitted from the solar cell and transmit the converted AC power. The system also include a multi-pulse transformer configured to receive the converted AC power and generate transformed power based on the converted AC power, wherein the transformed power comprises power at a voltage level that differs from the a voltage level of the converted AC power. | 03-14-2013 |
20130063992 | CONNECTION APPARATUS FOR POWER CONVERTER - A power converter apparatus is provided with a lead-in board in which alternating-current power received from power converting units is connected in parallel, and a connection base including frames for installing the power converting units therein. The frames are provided with connection sections for connecting the main, circuits of the power converting units. The lead-in board is provided with breakers for cut off alternating-current power from the power converting units. | 03-14-2013 |
20130088900 | ENERGY STORAGE SYSTEM AND CONTROLLING METHOD OF THE SAME - An energy storage system and a controlling method of the energy storage system are provided. The energy storage system reduces power consumption and increases inverter efficiency by providing a plurality of inverters in parallel and selectively driving ones of the inverters according to a power requirement of the load. The energy storage system supplies an alternating current (AC) power to a load. The energy storage system includes: a battery for supplying a direct current (DC) power; a plurality of inverters for connecting in parallel between the battery and the load to convert the DC power to the AC power; and a controller for selectively driving the inverters in accordance with a power requirement of the load. | 04-11-2013 |
20130088901 | MULTILEVEL INVERTER - Multilevel DC to AC power converter has three DC inputs (IN | 04-11-2013 |
20130107590 | SOLID STATE PULSED POWER GENERATOR | 05-02-2013 |
20130141951 | METHOD FOR FEEDING ELECTRICAL POWER INTO A THREE-PHASE AC VOLTAGE SYSTEM - The present invention relates to a method for feeding an unbalanced, three-phase current into a three-phase AC voltage system, comprising the steps of: producing a positive phase-sequence system for the current to be fed in, producing a negative phase-sequence system for the current to be fed in, superimposing the positive phase-sequence system and the negative phase-sequence system to form the current to be fed in and feeding the current composed in this manner into the three-phase AC voltage system. | 06-06-2013 |
20130155735 | STACKED VOLTAGE SOURCE INVERTER WITH SEPARATE DC SOURCES - A stacked voltage source inverter having separate DC sources is described herein. This inverter is applicable to low or medium voltage, low to medium power applications such as photovoltaic utility interface systems, battery storage application such as peak shaving with renewables, motor drive applications and for electric vehicle drive systems. The stacked inverter consists of at least one phase wherein each phase has a plurality of low voltage full bridge inverters equipped with an independent DC source. This inverter develops a near sinusoidal approximation voltage waveform with fast switching and small low pass AC output filter. A system controller controls operating parameters for each inverter. The inverter may have either single-phase or multi-phase embodiments connected in either wye or delta configurations. | 06-20-2013 |
20130155736 | BI-DIRECTIONAL ENERGY CONVERTER WITH MULTIPLE DC SOURCES - A multiple dc sources bi-directional energy converter includes a plurality of direct current (DC) power sources; one alternating current (AC) power source; at least one stacked alternating current (AC) phase, each stacked alternating current (AC) phase having at least two or more full bridge converters, each respectively coupled to one of the direct current power sources, each full bridge converter having an inductor electrically coupled thereto; and a local controller coupled to each full bridge converter controlling the firing sequence of the switching devices in said full bridge converter to generate an approximately nearly sinusoidal voltage waveform when operated as a voltage source inverter in one direction or generate an approximately nearly constant direct current (DC) output when operated as a full-wave active rectifier in the opposite direction. | 06-20-2013 |
20130176757 | REACTIVE ENERGY COMPENSATOR AND ASSOCIATED METHOD FOR BALANCING HALF-BUS VOLTAGES - A reactive energy compensator that can be electrically connected to an AC electrical network, including at least one input direct voltage bus, at least one voltage inverter including switches and first and second capacitors having first and second voltages at their terminals, control means for the switches, including computation means capable of generating a target control current, means for combining the target control current and the output current from the inverter, means for transmitting a control signal capable of driving the switches, and correction means for the control signals of the switches, the correction means being capable of adding a balancing current to the target control current, the balancing current being able to correct the target control current so as to reduce the difference between the values of the first and second voltages, the target control current being increased for an even harmonic of the network frequency. | 07-11-2013 |
20130188406 | REACTIVE ENERGY COMPENSATOR COMPRISING N PARALLEL INVERTERS, N CAPACITOR BANKS, AND MEANS FOR CONNECTING THE BANKS THROUGH PASSIVE ELECTRICAL COMPONENTS - A reactive energy compensator is provided. The compensator is connected to an alternating electrical network including M phase(s), M being an integer greater than or equal to 1. The compensator includes M connection terminals, N banks of capacitor(s) capable of providing reactive energy, N being an integer greater than or equal to 2, N two-way voltage inverters, connected to each other in parallel and each connected to a unique capacitor bank, each inverter being able to convert a direct current into an alternating current including M phase(s) in one direction and the alternating current into direct current in the other direction, each inverter including first and second input terminals and M output terminal(s), the input terminals being connected to the corresponding capacitor bank, each output terminal corresponding to a phase of the alternating current and being connected to a corresponding connection terminal, and a device for balancing the voltage of the N capacitor banks. | 07-25-2013 |
20130201736 | SOLAR INVERTER SYSTEM AND CONTROL METHOD THEREOF - A solar inverter system includes a first inverter, a second inverter, and a controller. The first inverter has a first input terminal, and a first output terminal. The first input terminal is coupled to a solar panel. The second inverter has a second input terminal, and a second output terminal. The second input terminal is coupled to the solar panel. The first output terminal and the second output terminal are parallel with a utility grid. The controller is coupled to the first inverter and the second inverter for controlling the first inverter and the second inverter to output total output power in turn, or controlling the first inverter and the second inverter to output the total output power simultaneously. | 08-08-2013 |
20130242628 | SOLAR POWER CONDITIONER - A solar power conditioner includes: a synchronous controller; and electric power converters connected in series with each other and arranged at panel groups, respectively. Each electric power converter executes a MPPT control for tracking a maximum power point of an output electric power of the panel group, and converts a voltage and a current of the output electric power of the panel group. The synchronous controller synchronously controls the electric power converters to superimpose converted voltages in series, the converted voltages outputting from the electric power converters, so that the electric power converters output a predetermined pseudo sine wave voltage or a predetermined alternating current voltage. | 09-19-2013 |
20130250635 | CONTROL TECHNIQUES FOR PHOTOVOLTAIC POWER PLANTS - A photovoltaic power plant includes solar cells and inverters that convert direct current generated by the solar cells to alternating current. The reactive powers generated by the inverters are based on a reactive power generated by a virtual inverter. The virtual inverter has an equivalent impedance representing the impedances of the inverters in the photovoltaic power plant. The reactive power setpoints of the inverters may be received from a local interpreter. The local interpreter may generate the reactive power setpoints from a global reactive power setpoint generated by a grid controller. | 09-26-2013 |
20130258729 | MEDIUM VOLTAGE POWER APPARATUS - A power apparatus includes power modules. Each of the power modules includes an input transformer and power cell units. The input transformer has at least one primary winding and a plurality of secondary windings, and the primary winding is electrically connected to an AC power source. The power cell units are connected in series with one phase output line to a multi-phase load, in which the power cell units are electrically connected to the secondary windings, respectively. | 10-03-2013 |
20130286697 | POWER QUALITY MANAGEMENT SYSTEM - A power quality management system includes a plurality of phase balancers, each phase balancer including single phase converters coupled between two phase lines and a plurality of controllers to control the plurality of phase balancers. Each controller includes a voltage unbalance detection module to detect amount of voltage unbalance in a plurality of phase lines and a voltage unbalance compensation module to generate reference current commands for each of the single phase converters to reduce the voltage unbalance. | 10-31-2013 |
20130286698 | POWER CONVERTING APPARATUS, OPERATING METHOD THEREOF, AND SOLAR POWER GENERATION SYSTEM - There are provided a power converting apparatus and an operating method thereof, and a solar power generation system. The power converting apparatus for a solar power generation system includes: a power converting unit converting an input signal generated by a solar cell module into an output signal; and a control circuit unit controlling an operation of the power converting unit, wherein the power converting unit includes at least one transformer, and a current sensor and a switching circuit connected to a primary winding of the at least one transformer, and the control circuit unit calculates a voltage and a current of the input signal using a current of the primary winding of the at least one transformer sensed by the current sensor and performs a maximum power point tracking (MPPT) control so that the power converting unit is operated at a maximum power point. | 10-31-2013 |
20130286699 | POWER SUPPLYING APPARATUS, METHOD OF OPERATING THE SAME, AND SOLAR POWER GENERATION SYSTEM INCLUDING THE SAME - There are provided a power supplying apparatus, a method of operating the same, and a solar power generation system including the same. The power supplying apparatus includes: a power supply unit generating a direct current (DC) input signal; a main circuit unit including a plurality of flyback converter circuits connected to the power supply unit to generate a DC output signal; and a control circuit unit controlling an operation of the main circuit unit, wherein the control circuit unit connects the plurality of flyback converter circuits to each other in series or in parallel according to a level of the DC input signal. Therefore, even in the case in which the level of the DC input signal is high, a circuit maybe configured using a circuit device having a low withstand voltage range and damage and deterioration of the circuit device may be prevented. | 10-31-2013 |
20130308357 | THREE-LEVEL UNIT INVERTER SYSTEM - In aspects of the invention, each three-level inverter unit has an output current detector. The output from each detector is given to connection wires via a resistor, the connection wires connecting the inverter units. The voltage across the resistor is detected and the deviation, or increment, of the current value of the unit concerned from the average value is determined. The rising up edge of the ON pulses for the IGBT to be controlled is delayed, corresponding to the magnitude of the deviation. Thus, the output current is balanced between the inverter units. | 11-21-2013 |
20130314957 | HIGH VOLTAGE HIGH POWER MULTI-LEVEL DRIVE STRUCTURE - A high voltage, high power multi-level drive structure includes a plurality of neutral-point-piloted (NPP) converter cells stacked together. At least one clamping diode is connected to one or many NPP converter cell to provide a neutral-point-pilot-clamped (NPPC) converter structure. Flying capacitors connected to the NPPC converter structure yield a neutral-point-clamped-flying-capacitor converter cell structure. | 11-28-2013 |
20140016380 | MULTI-LEVEL VOLTAGE CONVERTER - A multi-level voltage converter includes a multi-point converter circuit and at least one full bridge inverter circuit. The multi-point converter circuit is configured for converting a DC voltage into an intermediate multi-level voltage. The full bridge inverter circuit is electrically connected in series with the multi-point converter circuit and configured for receiving the intermediate multi-level voltage to generate a multi-level output voltage corresponding to a single phase output. | 01-16-2014 |
20140036557 | CASCADED H-BRIDGE (CHB) INVERTER LEVEL SHIFT PWM WITH ROTATION - Cascade H-Bridge inverters and carrier-based level shift pulse width modulation techniques are presented for generating inverter stage switching control signals, in which carrier waveform levels are selectively shifted to control THD and to mitigate power distribution imbalances within multilevel inverter elements using either complementary carrier or complementary reference modulation techniques. | 02-06-2014 |
20140049996 | HYBRID DC-TO-AC CONVERSION SYSTEM AND METHOD OF OPERATING THE SAME - A hybrid DC-to-AC conversion system includes a first DC input voltage, a second DC input voltage, a power conversion apparatus, and a comparison unit. The power conversion apparatus is connected in parallel to the first DC input voltage and the second DC input voltage to convert the first DC input voltage or the second DC input voltage into an AC output voltage. The comparison unit receives the AC output voltage and an external reference voltage. The comparison unit outputs a control signal to make the first DC input voltage supply a load when an absolute value of the AC output voltage is less than or equal to the external reference voltage, whereas the comparison unit outputs the control signal to make the second DC input voltage supply the load when the absolute value of the AC output voltage is greater than the external reference voltage. | 02-20-2014 |
20140056042 | POWER LAYER GENERATION OF INVERTER GATE DRIVE SIGNALS - Solid state switches of inverters are controlled by timing signals computed in power layer interface circuitry for individual inverters. Multiple inverters may be placed in parallel with common three-phase output. Common control circuitry generates timing signals or data used to reconstruct the common signals and sends these signals to the power layer interface circuitry. A processor in a power layer interface circuitry used these signals to recomputed the timing signals. Excellent synchronicity may be provided between parallel inverters that each separately reconstruct the timing signals based upon the identical received data. | 02-27-2014 |
20140078797 | CONTROL FOR FAULT-BYPASS OF CASCADED MULTI-LEVEL INVERTER - A cascaded multi-level inverter is controlled in fault bypass operation. Rather than relying on approximations or feedback forms, the reference voltages are generated as an analytic solution. The analytic solution and its implementation are not affected by the output frequency of the inverter and it is able to provide maximum possible balanced line-line voltage to a three-phase motor. In addition, the analytic solution provides exact limits for the allowable operation region of the motor power factor in order to prevent overvoltage conditions of the cell inverter. | 03-20-2014 |
20140104906 | ENERGY STORAGE DEVICE, AND SYSTEM HAVING AN ENERGY STORAGE DEVICE - The invention relates to an energy storage device ( | 04-17-2014 |
20140119075 | Parallel Connected Inverters - A distributed power system wherein a plurality of power converters are connected in parallel and share the power conversion load according to a prescribed function, but each power converter autonomously determines its share of power conversion. Each power converter operates according to its own power conversion formula/function, such that overall the parallel-connected converters share the power conversion load in a predetermined manner. | 05-01-2014 |
20140177300 | SWITCHED-MODE POWER SUPPLY SYSTEM AND AIRCRAFT COMPRISING SUCH A SYSTEM - An electric power supply system, comprising:
| 06-26-2014 |
20140185341 | DC TO AC POWER CONVERSION APPARATUS AND METHOD THEREOF - A DC-to-AC power conversion method is provided, including: generating an AC reference signal and an AC zero crossing detection signal; generating an error signal based on the AC reference signal and an output current or an output voltage at an AC output terminal; generating a turn-off signal based on the error signal and an input current at a DC input terminal; detecting or predicting a valley voltage of a resonance voltage to generate a turn-on signal; generating first, second, third and fourth switching signals based on the AC zero crossing detection signal, the turn-off signal and the turn-on signal; and controlling first, second, third and fourth switching elements of power conversion modules with the first, second, third and fourth switching signals, to enable the first and second power conversion modules to convert the input current of the DC input terminal to the output current of the AC output terminal. | 07-03-2014 |
20140254219 | POWER CONVERSION SYSTEM - A power conversion system comprising a plurality of modules each having an input and an output and being connected in series. Each module is connected to at least one DC power source that supplies power to the module. Voltage control circuitry provided within each of the modules to vary the voltage supplied between the input and the output between a maximum module voltage and a minimum module voltage. A control unit in communication with the voltage control circuitry of each of the modules varies the voltage supplied across the input and output of each of the modules such that the total voltage across the series connected modules forms an AC signal or a rectified version of an AC signal. | 09-11-2014 |
20140268948 | ELECTROMAGNETIC INTERFERENCE (EMI) REDUCTION IN INTERLEAVED POWER CONVERTER - A power converter system includes an interleaved power converter having a plurality of parallel-connected phase legs between DC terminals and an AC terminal. A plurality of parallel-connected inductors are each connected to one of the plurality of parallel-connected phase legs to provide a summed output of the parallel-connected phase legs to the AC terminal. A controller generates PWM signals used to control the state of each of the plurality of phase legs by comparing a carrier signal to a reference signal, wherein a period of the carrier signal is randomly varied from a nominal period. | 09-18-2014 |
20140293668 | Hybrid AC/DC Converter For HVDC Applications - A power electronic converter, for connecting AC and DC networks and transferring power therebetween, comprises: first and second DC terminals for connection in use to a DC network; at least one primary converter limb extending between the first and second DC terminals and having first and second primary limb portions separated by a primary AC terminal for connection in use to a respective phase of a multi-phase AC network, at least one of the first and second primary limb portions including at least one primary active switching module to selectively allow current to flow through the corresponding primary converter limb in a first direction from the corresponding primary AC terminal to the DC terminals and in a second direction from the DC terminals to the corresponding primary AC terminal; and at least one secondary converter limb extending between the first and second DC terminals and having first and second secondary limb portions separated by a secondary AC terminal for connection in use to a further respective phase of the said multi-phase AC network, each of the first and second secondary limb portions including at least one passive current check element to limit current flow through the corresponding secondary converter limb to a single direction from the corresponding secondary AC terminal to the DC terminals. | 10-02-2014 |
20140334204 | APPARATUS FOR PARALLEL OPERATION OF PULSE-WIDTH MODULATION POWER CONVERTERS - To perform an anti-windup control without interference with a cross current compensating function even in case of voltage saturation. | 11-13-2014 |
20140376289 | METHODS, SYSTEMS, COMPUTER PROGRAM PRODUCTS, AND DEVICES FOR RENEWABLE ENERGY SITE POWER LIMIT CONTROL - The present invention provides methods, systems, computer program products, and devices for renewable energy site power limit control that address conditions of plant saturation and loop delay. In an exemplary embodiment, power limit control of the present invention is broken into two levels of control: a site-wide real power limit control that produces a single site-wide command, SitePlimCom, for all inverters, and inverter-level power limit control that outputs a command, Inv[x].PlimCom[k], for individual inverters. In some embodiments, the invention has one or more of the following features: an integrator with nonlinear gains, limit based anti-windup, a power limit control term based on the sum of both integrator and feed-forward terms, and an inverter-level controller designed to meet slew rate and site power overshoot constraints. The invention can be used at any renewable energy site employing inverters wherein improved dynamic control performance is needed, including solar, wind, and tidal energy sites. | 12-25-2014 |
20150016159 | Multiphase Power Converter Circuit and Method - A multiphase power converter circuit includes at least two single phase power converter circuits. Each single phase power converter circuit includes at least one converter series circuit with a number of converter units. The converter series circuit is configured to output a series circuit output current. A synchronization circuit is configured to generate at least one synchronization signal. At least one of the converter units is configured to generate an output current such that at least one of a frequency and a phase of the output current is dependent on the synchronization signal. | 01-15-2015 |
20150016160 | POWER CONVERTER - A power converter includes inverters, AC sides of the inverters being connected in parallel, and a controller configured to control total output power of the inverters by controlling output power of at least one of the inverters in a control cycle shorter than a shortest communication cycle which allows communication with each of the inverters. | 01-15-2015 |
20150016161 | POWER CONVERTER - A power converter includes inverters, AC sides of the inverters being connected in parallel, a power command value determiner configured to determine a first power command value and a second power command value, the first power command value being lower than a proportional division power value obtained by proportionally dividing a required power value required as total output power of the inverters based on respective rated outputs of the inverters, the second power command value being higher than the proportional division power value, and a controller configured to control output powers of the inverters at the first power command value and the second power command value determined by the power command value determiner. | 01-15-2015 |
20150062984 | POWER CONVERSION CIRCUIT AND POWER CONVERSION SYSTEM - A power converter, includes a first terminal and a second terminal which are connected to a direct current; a third terminal connected to an alternating current; N multi-level bridge arms connected in parallel to the first terminal and the second terminal, where the N multi-level bridge arms work in a parallel-interleaved manner, each multi-level bridge arm of the N multi-level bridge arms includes an alternating current node, and multiple time-varying levels are generated at the alternating current node, where the multiple levels are more than two levels; and a coupling inductor, including N windings coupled by one common magnetic core, where one end of each winding of the N windings is connected to an alternating current node of one multi-level bridge arm of the N multi-level bridge arms, and the other end of each winding of the N windings is connected to the third terminal. | 03-05-2015 |
20150085541 | MULTI-LEVEL INVERTER AND POWER SUPPLY SYSTEM - A multi-level inverter includes two N-level inverter units with pulse width modulation waves staggered by a phase of 180 degrees, and N is an integer greater than or equal to 3; a direct current power source module, where an output end thereof is connected to input ends of the two N-level inverter units; a transformer, where the transformer includes a primary side and a secondary side, an inductor of the primary side and an inductor of the secondary side are coupled, and one end of the inductor of the primary side and one end of the inductor of the secondary side are connected to output ends of the two N-level inverter units respectively. The two N-level inverter units are reversely coupled, and the other end of the inductor of the primary side and the other end of the inductor of the secondary side are connected. | 03-26-2015 |
20150092462 | CONTROL CIRCUIT AND CONTROL METHOD FOR INVERTER CIRCUIT, AND CONTROL CIRCUIT AND CONTROL METHOD FOR POWER CONVERSION CIRCUIT - A control circuit controls the inverter circuit in one of the non-master-slave inverters connected in parallel in a power system. The control circuit includes: a target parameter controller for generating a compensation value for adjusting a target parameter to the target value; a cooperative correction value generator for generating a correction value for cooperating with another of the inverters; a PWM signal generator for generating a PWM signal based on a correction compensation value obtained by adding the correction value to the compensation value; a weighting unit for weighting the correction compensation value; and a communication unit for communicating with other inverters. The communication unit transmits the weighted correction compensation value to the other inverters. The cooperative correction value generator generates the correction value using an operation result based on the weighted correction compensation value and a reception compensation value received by the communication unit from the other inverters. | 04-02-2015 |
20150131345 | METHOD AND APPARATUS FOR MINIMISING A CIRCULATING CURRENT OR A COMMON-MODE VOLTAGE OF AN INVERTER - The present disclosure discloses a method and an apparatus implementing the method for minimising a circulating current of parallel-connected inverters. The method can include, for at least one parallel-connected inverter, measuring a common-mode voltage of the inverter, and controlling a cycle length of the switching cycle on the basis of the common-mode voltage. | 05-14-2015 |
20150138855 | APPARATUS FOR CONTROLLING PARALLELED INVERTER - An apparatus for controlling paralleled inverter is disclosed. In the apparatus for controlling paralleled inverter, one synchronization signal is shaped by at least two inverters to respectively transmit a voltage command and an operation command. | 05-21-2015 |
20150295515 | SWITCHING STAGE, ENERGY CONVERSION CIRCUIT, AND CONVERSION STAGE FOR WIND TURBINES COMPRISING THE ENERGY CONVERSION CIRCUIT - The present invention relates to an energy conversion circuit comprising a switching stage with a positive DC voltage terminal ( | 10-15-2015 |
20150303829 | STACKED VOLTAGE SOURCE INVERTER WITH SEPARATE DC SOURCES - A stacked voltage source inverter having separate DC sources is described herein. This inverter is applicable to low or medium voltage, low to medium power applications such as photovoltaic utility interface systems, battery storage application such as peak shaving with renewables, motor drive applications and for electric vehicle drive systems. The stacked inverter consists of at least one phase wherein each phase has a plurality of low voltage full bridge inverters equipped with an independent DC source. This inverter develops a near sinusoidal approximation voltage waveform with fast switching and small low pass AC output filter. A system controller controls operating parameters for each inverter. The inverter may have either single-phase or multi-phase embodiments connected in either wye or delta configurations. | 10-22-2015 |
20150303830 | LARGE SCALE ENERGY STORAGE SYSTEM ENABLING BALANCED CONTROL OF INVERTERS - There is disclosed a large scale energy storage system enabling balanced control of inverters, the large scale energy storage system including an inverter controller comprising a PWM generation circuit configured to generate a reference PWM signal and a first O/E converter configured to convert the reference PWM signal transmitted from the PWM generation circuit into an optical signal and to output the optical signal, and a plurality of PCS inverters configured to output a grid voltage, each of the PCS inverters comprising a second O/E converter embedded therein to convert the PWM signal and the optical signal output from the inverter controller into an optical signal and a plurality of inverter modules. | 10-22-2015 |
20150349662 | PULSE-WIDTH MODULATION CONTROL OF PARALLELED INVERTERS - A system includes a paralleled inverter circuit and a controller. The paralleled inverter circuit includes a first inverter and a second inverter. The controller is configured to control a first plurality of switches of the first inverter and a second plurality of switches of the second inverter based upon a control vector. The controller controls the paralleled inverter circuit using a first unit vector for a first time period and controls the paralleled inverter circuit using a second unit vector for a second time period. The first unit vector and the second unit vector are selected based upon the control vector, and the first time period and the second time period are determined based upon the control vector. | 12-03-2015 |
20160079883 | CONTROLLING A MODULAR CONVERTER IN TWO STAGES - A modular converter having a plurality of converter modules for converting an input voltage into an output voltage to be supplied to a load by receiving a control input reference vector, a control input vector and a control input parameter vector; determining a control output reference vector from the control input reference vector, the control input vector and the control input parameter vector in a first control stage; and controlling the converter modules by generating switching signals based on the control output reference vector in a further control stage. | 03-17-2016 |
20160087548 | UNIVERSAL POWER CONVERSION DEVICES FOR ALTERNATING CURRENT ELECTRIC APPARATUS - The present disclosure is directed to universal power conversion devices for alternating current electric apparatus. One example power conversion device includes a plurality of transformers and a plurality of terminal blocks. The plurality of terminal blocks comprise at least an AC input terminal block for receiving an input alternating current signal and a primary coil terminal block. The primary coil terminal block has a plurality of output terminals respectively connected to a plurality of taps of a plurality of primary coils of the plurality of transformers. A plurality of jumpers respectively providing electrical connection between respective output terminals of the AC input terminal block and input terminals of the primary coil terminal block are selectively reconfigurable for reconfiguring a power conversion applied to the input alternating current signal by the power conversion device. | 03-24-2016 |
20160118909 | PARALLEL INVERTER SYSTEM, AND SHUTDOWN CONTROL METHOD AND SHUTDOWN CONTROL DEVICE FOR PARALLEL INVERTER SYSTEM - Provided are a parallel inverter system, and a shutdown control method and a shutdown control device for the parallel inverter system. A shutdown instruction is determined and responded according to a level of the shutdown instruction. The shutdown instruction is determined to be an emergency shutdown instruction under certain emergency shutdown conditions, and a driving signal for the power switch devices of the inverter apparatus is needed to be instantly locked out. The shutdown instruction is determined to be a normal shutdown instruction under non-emergency shutdown conditions, a switch-off signal is transmitted to alternating-current switches connected to the inverter apparatus to be shut down, states of the alternating-current switches connected to the inverter apparatus to be shut down are detected, the driving signal for the power switch devices of the inverter apparatus to be shut down is instantly locked out in a case that the alternating-current switches are switched off. | 04-28-2016 |
20160134201 | CONTROL METHOD AND CONTROL DEVICE FOR INVERTER SYSTEM - The present application discloses a control method and a control device for parallel inverters. The method comprises: receiving a feedback signal Vmg reflecting load voltage and a voltage reference signal Vref to generate a command signal P | 05-12-2016 |
20160172997 | MODULAR POWER CONVERSION PLATFORM | 06-16-2016 |
20160380556 | SYSTEM AND METHOD FOR OPTIMIZING FUNDAMENTAL FREQUENCY MODULATION FOR A CASCADED MULTILEVEL INVERTER - A system and a method for optimizing fundamental frequency modulation in a cascaded multilevel inverter (CMI) are provided. The CMI includes at least a first H-bridge module and a second H-bridge module connected in series with the first H-bridge module. The first H-bridge module is operated according to a first duty cycle and the second H-bridge module is operated according to a second duty cycle. The first duty cycle is greater than the second duty cycle. The first and second H-bridge modules are controlled utilizing fundamental frequency modulation. A portion of the first duty cycle is transferred to the second duty cycle thereby optimizing fundamental frequency modulation by at least improving power sharing between the first and second H-bridge modules and improving equalization of DC capacitor currents and voltage ripples while maintaining the same fundamental modulation to the output voltage waveform. | 12-29-2016 |