| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 307085000 | Connecting or disconnecting | 67 |
| 20090072626 | POWER SUPPLY APPARATUS HAVING SWITCHABLE SWITCHING REGULATOR AND LINEAR REGULATOR - A control circuit is provided in which two power sources can be efficiently switched, for a power supply apparatus provided with a step down switching regulator and a linear regulator. A PWM controller generates a pulse width modulation signal with which a duty ratio is controlled so that output voltage of the switching regulator approaches a predetermined reference voltage. A compulsory OFF circuit monitors a switching voltage, and when a first threshold voltage is exceeded, switches a synchronous rectifier transistor OFF. A minimum ON time setting circuit limits the duty ratio of the pulse width modulation signal, so that ON time of the switching transistor is longer than a predetermined minimum value. A selector circuit monitors an error voltage, and when a predetermined state continues for a predetermined first period, puts the linear regulator in an operating state, and the step down switching regulator in a halt state. | 03-19-2009 |
| 20090284080 | METHOD OF CONTROLLING DC/DC CONVERTER, FUEL CELL VEHICLE FOR CARRYING OUT SUCH METHOD - A triangular-wave current flows through a reactor of a DC/DC converter for converting voltages between increased and reduced levels. Surges are reduced, which are developed in an output voltage serving as a control voltage when the triangular-wave current changes across a zero value at which the current direction is changed. When a primary current flowing through the reactor changes across | 11-19-2009 |
| 20090302687 | Medium Voltage Land Connection for Marine Vessels - A device for electrically connecting a polyphase ship distribution network to a polyphase land supply network includes a connection unit for connecting the land supply network. The connection unit is connected to a back-to-back link by way of an input transformer, the link having current converters that are interconnected via at least one direct current voltage circuit. An output transformer is connected downstream of the back-to-back link. The output voltage of the transformer lies between 5 and 50 kV. The output transformer can be connected to the ship distribution network via a single multi-phase interconnecting cable. | 12-10-2009 |
| 20100052429 | Power Generation and Control System - A power generation and control system is easily installed in a consumer household, a business, or an end-user establishment for generating power and preventing power from flowing to a power grid from a consumer circuit during a power outage A communications transceiver is adapted to transmit a permission signal for allowing power generation only after the control system has been installed. The control system can be adapted to replace an existing circuit breaker in a household circuit breaker box and prevents power from traveling from consumer power generators to the grid during a power outage. In the same manner that end-users can add appliances to existing circuits, end-users can easily add additional power generation devices without hiring a professional electrician and without worrying about causing harm to utility workman during power outages. | 03-04-2010 |
| 20100207456 | CONTROL OF SMALL DISTRIBUTED ENERGY RESOURCES - A method includes operating a microsource in a grid mode in which the microsource is connected to a utility grid. The microsource is located in a microgrid and is configured to deliver a power P | 08-19-2010 |
| 20110018355 | CAPACITIVE LOAD DRIVING CIRCUIT, LIQUID EJECTION DEVICE, AND PRINTING APPARATUS - A capacitive load driving circuit that drives an electrical load having a capacitive component, includes: a first power supply generating a first voltage; a second power supply generating a second voltage different from the first voltage; a plurality of charge storage elements charged by the first power supply; a first connection unit that connects the plurality of charge storage elements to the electrical load by switching connections among the charge storage elements; and a second connection unit that connects the second power supply to the electrical load. | 01-27-2011 |
| 20110043045 | SYSTEMS AND METHODS FOR ASYNCHRONOUS SAMPLING DATA CONVERSION - Disclosed herein are systems and methods for converting data samples representing alternating electric currents. The data samples may be obtained by sampling a first alternating electric current having a first frequency at a sampling frequency, sampling a second alternating electric current having a second frequency at the sampling frequency, and converting the data samples using a conversion algorithm to compensate for any discrepancy caused by the difference between the first frequency and the second frequency. The corrected data samples may be utilized to determine various characteristics of the alternating electric current, such as voltage magnitude, voltage phase angle, current magnitude, current phase angle, and other related attributes. In one application, the systems and methods disclosed herein may be utilized in connection with an intelligent electronic device used to couple a first electrical system, such as a power generator, to a second electrical system, such as a utility intertie. | 02-24-2011 |
| 20110101787 | SERIES/PARALLEL POWER SUPPLY SWITCHING - A device which can dynamically configure an array of power supply cells such as photovoltaic (PV) solar cells to provide power to a load device based on the power requirements of the load device. By selectively configuring the array of power supply cells according to one of a number of available series/parallel connection schemes, the supplied power can be more closely tailored by a controller to the requirements of the load device. | 05-05-2011 |
| 20110234009 | FUEL CELL DEVICE AND METHOD FOR FEEDING ELECTRICAL CURRENT TO ELECTRICAL NETWORK - A method is disclosed for producing electrical current by a fuel cell device, which inputs electrical current to an electrical network. A fuel cell device can be arranged to be parallel connected to the electrical network. A phase reference signal can be utilized in the inputting of the electrical current, and electrical current inputted to electrical network can be current controlled by a power transformer having a power stage. The fuel cell device can be switched off from the electrical network when a malfunction occurs in the electrical network. The fuel cell device can be changed, using the phase reference signal, to the switched off operation mode for performing voltage controlled operation of the power transformer. A controllable load can be used for maintaining a power stability between the voltage controlled power transformer and other parts of the fuel cell device. When the malfunction has vanished, the fuel cell device can be changed, using the phase reference signal, to a switched on operation mode for performing current controlled operation of the power transformer. | 09-29-2011 |
| 20110278939 | Electrical Power Transfer Plug and Connection System - A system and method that offers the provision too rapidly and safely connect electrical generation sources, including inverters used by solar collecting panels, or wind turbines, and backup hydrocarbon fueled generators or any other supplemental power sources including storage batteries, fuel cells and future electric automobiles. Thus enabling the feeding of power to all circuits in the home or small business, not just isolated circuits in a structure. The system is compliant with electric codes, requires no costly rewiring inside the structure or in the electrical circuit panel and can be accomplished entirely from the outside of the home or small business adjacent to the electric service meter for the home or small business structure. It offers owners, utilities and equipment manufacturers a simple, safe, cost effective method for interconnection of renewable generation and storage devices with the electric grid for participation in smart energy management and net metering initiatives with local utility companies. | 11-17-2011 |
| 20120228951 | Connecting a Photovoltaic Array at a High Open Circuit Voltage - For connecting a PV array via an inverter to an AC power grid, at first a DC link at the input side of the inverter is pre-charged from the AC power grid. A link voltage of the DC link is adjusted to a pre-set value with the inverter connected to the AC power grid, the pre-set value being lower than an open circuit voltage of the PV array, and then the PV array at its open circuit voltage is directly connected to the DC link, while the link voltage is continuously adjusted to the pre-set value. | 09-13-2012 |
| 20120306279 | Photovoltaic Voltage Regulation - A photovoltaic system includes: a photovoltaic generator comprising strings that each includes one or more photovoltaic cells; a power converter; switches; and a controller. The power converter is configured to convert direct current (DC) power provided by the photovoltaic generator into alternating current (AC) power, and to output the AC power. Each switch is associated with one of the strings and is configured to connect the associated string to the power converter when set to a first setting, such that power generated by the first string can flow to the power converter. Each switch is also configured to disconnect the string from the power converter when set to a second setting. The controller is configured to control the power provided by the photovoltaic generator by selectively connecting the strings of the photovoltaic generator to the power converter by controlling the settings of the switches. | 12-06-2012 |
| 20130033115 | RE-COMBINER BOX OF PHOTOVOLTAIC SYSTEM - An apparatus for a photovoltaic system in which multiple poles are connectable with multiple fuses is provided. The apparatus includes a rotor configured to occupy at least first and second rotational angles, a disconnect unit including a plurality of interrupter housings respectively configured to connect at least one of the multiple poles with at least one of the multiple fuses in accordance with a rotational angle of the rotor, at least one of the plurality of the interrupter housings being mutually connectable, a transmission unit disposed and configured to electrically combine the multiple poles into a lesser number of the multiple poles, a housing sized to house the rotor, the disconnect unit and the transmission unit and an actuator arm disposed at the exterior of the housing and configured to be selectively actuated to cause the rotor to occupy the at least one of the rotational angles. | 02-07-2013 |
| 20130193767 | Method and Apparatus for Managing the Distribution of Electrical Energy in a Power Distribution Grid - A power distribution grid comprising a plurality of cells configured to be electrically connected to each other and a power management system. A cell in the plurality of cells is configured to distribute electrical energy to an area corresponding to the cell. The cell has a plurality of entry nodes configured to allow the electrical energy to flow into the cell. The power management system is configured to manage a distribution of the electrical energy to the area by the cell independently of the distribution of the electrical energy to other areas by other cells in the plurality of cells. | 08-01-2013 |
| 20130193768 | POWER SUPPLY SYSTEM - To provide a power supply system equipped with a storage battery assembly including a plurality of storage battery control units, the power supply system being configured such that a group of the storage battery control units, which are selected from the storage battery control units, and which have output voltages within a predetermined voltage range, are first connected to the parallel connection line, and such that the voltage range is set so as to maximize the number of the storage battery control units having output voltages within the voltage range. | 08-01-2013 |
| 20130307343 | Method for Sequentially Disconnecting/Connecting Electrical Current Sources From/To A Common Load - The disclosure relates to methods for sequentially disconnecting at least two electrical current sources from a common load or for sequentially connecting the current sources to a load, wherein the current sources are each connected to the common load via a switching unit, each comprising a parallel circuit comprising an electromechanically actuated switch and an associated semiconductor switch. In the two methods, first semiconductor switches are closed if they are still not closed and the relevant electromechanical switches are opened. In the method for sequential disconnection, then at least two of the semiconductor switches that were actuated or that were already closed are opened sequentially. In the method for sequential connection, a plurality of the semiconductor switches are first opened, of which then at least two are closed sequentially. The disclosure also relates to a photovoltaic system comprising an apparatus that is suitable for implementing the method. | 11-21-2013 |
| 20140001872 | POWER SWITCHING CIRCUIT AND ELECTRONIC DEVICE USING SAME | 01-02-2014 |
| 20140091632 | PARALLELING MODULE FOR A GENERATOR SYSTEM - Some embodiments relate to an example power management system. The power management system includes a first enclosure and a second enclosure. A first generator is inside the first enclosure and a second generator is inside the second enclosure. The power management system further includes a paralleling enclosure and a paralleling module inside the paralleling enclosure. The paralleling module includes at least one switching device within the paralleling enclosure to electrically connect the first generator to the second generator. The paralleling enclosure further includes a plurality of connectors that permit electrical connection between the paralleling module and the first generator, the second generator and an output without opening the paralleling enclosure. | 04-03-2014 |
| 20140175891 | Current Generator - A current generator is disclosed. An example current generator includes a plurality of current cells connected in parallel, each current cell being connected to a switch. The current generator further includes a first summer configured to sum the output of each current cell of a first subset of the plurality of current cells and a second summer configured to sum the output of each current cell of a second subset of the plurality of current cells. The current generator also includes a combiner configured to combine the outputs of the first and second summers. Further, each switch is switchable according to a sequence to generate a summed output of the current cells at a plurality of quantization levels to generate positive and/or negative alternations of a pseudo-sinusoidal, alternating current. | 06-26-2014 |
| 20140265609 | SOLAR PANELS WITH CONTACTLESS PANEL-TO-PANEL CONNECTIONS - A solar panel array comprises a first plurality of solar panels arranged side-by-side in a first course and a second plurality of solar panels arranged side-by-side in a second course, the second course partially overlapping the first course. Electrical energy produced by each solar panel of the array is aggregated with the electrical energy produced by the other solar panels of the array without physical electrical contacts between the solar panels. In one embodiment, contactless inductive couplers are used to couple the electrical energies of the panels together. | 09-18-2014 |
| 20140339903 | ELECTRIC POWER TRANSMITTING APPARATUS AND METHOD FOR CONTROLLING ELECTRIC POWER TRANSMISSION - An electric power transmitting apparatus and a method for controlling electric power transmission that switches a connection state of a coupling electrode in accordance with the shape and the size of an electric power receiving apparatus, a position where the electric power receiving apparatus is placed. | 11-20-2014 |
| 307086000 | Condition responsive | 46 |
| 20090066163 | TWO-SOURCE SERIES INVERTER - Systems and methods are disclosed for a two-source series inverter. The systems and methods combine operation of a first voltage source and a second voltage source in series powering a novel voltage combining arrangement and a conventional inverter via a switch configuration to power a load. The switch configuration is controlled by a plurality of control signals generated by a controller based on a variety of control modes, and feedback signals. | 03-12-2009 |
| 20100096933 | Method and system for high-reliability power switching - The present disclosure is directed to systems and methods for high-reliability power switching. | 04-22-2010 |
| 20110062787 | Intelligent Solar Energy Collection System - A street-lighting and solar energy collection system is disclosed. The system comprises a plurality of lighting/solar energy collecting units, an AC and DC power transmission means and a control unit. The system operates in one of the two operation modes. In the first operation mode as the street-lighting system, the units receive AC power from the power grid for lighting. In the second operation mode as the solar energy collecting system, the units transmit generated DC electricity to a centralized DC to AC converter in the control unit. The control unit further provides a means for switching the system in between two modes. When the system is operated as the solar energy collection system, it is disconnected from the power grid. The generated DC electricity from each unit is converted by the AC to DC converter in the control unit and is subsequently injected into the power grid. Communication devices in the units and in the control unit form an ad hoc communication network. Instructions for operations can be sent from the control unit to the units. Further, the operation status from each unit can be collected and be sent to the control unit. | 03-17-2011 |
| 20110115301 | METHOD AND AREA ELECTRIC POWER SYSTEM DETECTING ISLANDING BY EMPLOYING CONTROLLED REACTIVE POWER INJECTION BY A NUMBER OF INVERTERS - An area electric power system includes a number of direct current power sources, and a number of inverters operatively associated with the number of direct current power sources. Each of the number of inverters is structured to provide real power and controlled reactive power injection to detect islanding. An output is powered by the number of inverters. A number of electrical switching apparatus are structured to electrically connect the number of inverters to and electrically disconnect the number of inverters from a utility grid. A number of devices are structured to detect islanding with respect to the utility grid responsive to a number of changes of alternating current frequency or voltage of the output. | 05-19-2011 |
| 20110187200 | ANTI-ISLANDING FOR GRID-TIE INVERTER USING COVARIANCE ESTIMATION AND LOGIC DECISION MAKER - An anti-islanding implementation that introduces a small, continuously varying phase shift pattern in the output current of an inverter. In grid-connected mode, this phase shift pattern has no impact on the frequency of the inverter's output voltage. However, when islanded, the phase shift will cause the voltage frequency to deviate from nominal. Changes in the output current phase thus correlate well with the voltage frequency, so a covariance index is used to detect an islanding configuration. When this index exceeds a threshold, a larger phase shift pattern is introduced in the output current, large enough to cause the voltage frequency to fall outside the inverter's trip protection window without compromising the inverter's power quality yet ensuring reliable tripping of the inverter. | 08-04-2011 |
| 20120007436 | ISOLATED OPERATION DETECTION DEVICE - With a method whereby reactive power is changed from a fluctuating output to a constant output by a frequency rise or fall monitor circuit stage level being exceeded, and an isolated operation is detected, a problem occurs with a small scale grid in that, as the frequency is liable to fluctuate due to a load fluctuation, there is liable to be a false detection of an isolated operation. In contrast, an abnormal frequency stage detection can be performed such that the frequency at a point when the rising edge of a reactive power fluctuation is detected, and the frequency at a point when the falling edge is detected, are detected sequentially, and an abnormal frequency stage detection is recognized when the order of the difference between the current detection value and the previous detection value is “increase”, “decrease”, “increase”. | 01-12-2012 |
| 20120056484 | Inverters - We describe a photovoltaic power conditioning unit for delivering power from multiple photovoltaic panels to an ac mains power supply output, comprising: a dc input for receiving power from multiple photovoltaic panels; an ac output for delivering ac power to the ac supply; a bank of electrolytic energy storage capacitors for storing energy from the dc source for delivery to the ac supply; a dc-to-ac converter coupled to the ac output and having an input coupled to the bank for converting energy stored in the bank to ac power for the ac supply; and further comprising: a plurality of sense and control circuits, one for each capacitor in the bank, wherein each circuit is coupled in series with a capacitor, and is configured to disconnect the associated capacitor from the bank upon detection of a current flow thorough the associated capacitor of greater than a threshold current value. | 03-08-2012 |
| 20120098347 | ELECTRONIC CIRCUIT BREAKER WITH ALTERNATE MODE OF OPERATION USING AUXILIARY POWER SOURCE - An electronic circuit breaker includes controllable mechanical contacts adapted to connect a primary power source to at least one load; and control circuitry for monitoring the flow of power from the primary power source to the load, detecting fault conditions and automatically opening the contacts in response to the detection of a fault condition. A primary power source supplies power to the control circuitry when the contacts are closed, and an auxiliary power source supplies power to the control circuitry when the contacts are open, whether by a trip or by manual opening. | 04-26-2012 |
| 20120104866 | IMAGE FORMING APPARATUS - An image forming apparatus to safely supply or interrupt power according to opening or closing of a cover includes a power source unit to output low power and high power, an interlock switch unit to be turned on or off according to opening or closing of a cover, and an engine power circuit unit. The engine power circuit unit includes cover opening/closing sensing switches connected to the interlock switch unit to be turned on or off according to whether the interlock switch unit is on or off, and power supply switches connected to the power source unit to apply or interrupt the power from the power source unit according to a determination of whether the cover opening/closing sensing switches are on or off. | 05-03-2012 |
| 20120126629 | Controller, power inverter, photovoltaic power supply system, and method for controlling deactivation of at least one photovoltaic module - Various embodiments may provide a controller for photovoltaic power supply, configured to be connected with one or more photovoltaic modules and configured to be connected with an AC grid terminal, wherein the controller is configured to monitor the status of the AC grid power and to generate a signal for deactivation of the photovoltaic modules if the AC power is off, wherein the controller is further configured to generate the signal such that it controls the activation of the at least one photovoltaic module with an active signal having a non-zero signal voltage level and such that it controls the deactivation of the at least one photovoltaic module with an inactive signal, wherein the deactivation of the at least one photovoltaic module results in that the connections between a plurality of photovoltaic modules are interrupted or that the photovoltaic modules are short circuited. | 05-24-2012 |
| 20120175965 | System and Method for Reducing Mismatch in a Photovoltaic Structure - A photovoltaic structure having a reduced mismatch, and a system, method and computer program for reducing mismatch in a photovoltaic structure are provided. The photovoltaic structure has a plurality of photovoltaic elements arranged in a plurality of rows and a plurality of columns. The photovoltaic elements are electrically connected to one another in a plurality of parallel circuits connected together. At least two of the photovoltaic elements from one of the rows are connected in different parallel circuits to reduce partial shading loss for a plurality of time instants. The system, method and computer program provide a connection matrix for the photovoltaic structure based on irradiance levels for the photovoltaic elements to enable connection of the photovoltaic elements to one another to reduce partial shading loss for a plurality of time instants. | 07-12-2012 |
| 20120175966 | POWER SUPPLY SYSTEM - In a power supply system with a storage battery assembly including storage battery pack groups, when electric power is supplied from at least one of the storage battery pack groups to a load connected to a parallel connection line, the storage battery pack group having the highest output voltage is selected from the storage battery pack groups capable of being commonly connected to the parallel connection line, and is first connected to the parallel connection line, and the highest output voltage of the output voltages of the storage battery pack groups connected to the parallel connection line is set as a reference voltage, and only the storage battery pack groups having an output voltage within a predetermined voltage range during discharging relative to the reference voltage are connected to the parallel connection line. | 07-12-2012 |
| 20130033116 | Power detecting circuit with fast power removing detection, electronic device and method thereof - A power detecting circuit with fast power removing detection is disclosed. The power detecting circuit comprises an isolating device, coupled between an external power source and an internal power source, for isolating the external power source, and the internal power source, and a comparator, coupled to the external power source, for determining if the external power source is removed, and accordingly generating a removing signal. | 02-07-2013 |
| 20130140904 | AUTOMATIC TRANSFER SWITCH HAVING AN INTERLOCK ARRANGEMENT - An automatic transfer switch to automatically electrically connect an electrical panel to a second power source, e.g., an electric generator, during interruption or failure of a first power source, e.g., a utility power supply, includes a powered interlock arrangement that is operative to prevent the electrical panel from being electrically connected to both power sources simultaneously. | 06-06-2013 |
| 20130162050 | CONNECTION DEVICE FOR DETECTING CONNECTION STATUS, ELECTRICAL CONNECTION ASSEMBLY, AND ELECTRONIC APPARATUS - A connection device for detecting connection status is used for detecting that an electrical connector is inserted in upside up position or upside down position. In the connection device, first connecting terminals are disposed on a first side while second connecting terminals are disposed on a second side. When the electrical connector is connected to the connection device, the terminals, which do not establish connection with the electrical connector, contact with a metal housing of the electrical connector. Therefore, at least two of these terminals are short circuited. Through determining which group of the first connecting terminals and the second connecting terminals is short circuited, a control module determines that the electrical connector is inserted in upside up position or upside down position. | 06-27-2013 |
| 20130169056 | MULTI-MODULE INVERTERS AND CONVERTERS FOR BUILDING INTEGRABLE PHOTOVOLTAIC MODULES - Provided are multi-module inverters and/or converters for connecting to a set of building integrable photovoltaic (BIPV) modules that are interconnected in series and arranged into photovoltaic arrays on building structures. Outputs from multiple multi-module inverters and/or converters in one array may be combined using parallel connections and then connected to an electrical grid, standalone electrical network, or central inverter. Each set is connected to a different multi-module inverter and/or converter and may have a variable number of BIPV modules. A multi-module inverter and/or converter may be positioned within or integrated into one of the BIPV modules or attached to a building structure supporting the array. In certain embodiments, a multi-module inverter and/or converter is installed in a ventilation channel on the back side of a module. A multi-module inverter and/or converter may be also integrated into an electrical routing structure connected to one of the BIPV modules. | 07-04-2013 |
| 20140035377 | LOCALIZED POWER POINT OPTIMIZER FOR SOLAR CELL INSTALLATIONS - In one embodiment, a solar cell installation includes several groups of solar cells. Each group of solar cells has a local power point optimizer configured to control power generation of the group. The local power point optimizer may be configured to determine an optimum operating condition for a corresponding group of solar cells. The local power point optimizer may adjust the operating condition of the group to the optimum operating condition by modulating a transistor, such as by pulse width modulation, to electrically connect and disconnect the group from the installation. The local power point optimizer may be used in conjunction with a global maximum power point tracking module. | 02-06-2014 |
| 20140103729 | STARTING OF A SOLAR POWER PLANT - A method of optimizing one or more starting parameters of a solar power generator system and a solar power generator system, wherein the solar power generator system includes a solar panel array and a converter for converting power obtained from the panel array. The method can include measuring an output voltage of the panel array, comparing the output voltage with a starting voltage (V | 04-17-2014 |
| 20140246915 | Inverters - We describe a photovoltaic power conditioning unit for delivering power from multiple photovoltaic panels to an ac mains power supply output, comprising: a dc input for receiving power from multiple photovoltaic panels; an ac output for delivering ac power to the ac supply; a bank of electrolytic energy storage capacitors for storing energy from the dc source for delivery to the ac supply; a dc-to-ac converter coupled to the ac output and having an input coupled to the bank for converting energy stored in the bank to ac power for the ac supply; and further comprising: a plurality of sense and control circuits, one for each capacitor in the bank, wherein each circuit is coupled in series with a capacitor, and is configured to disconnect the associated capacitor from the bank upon detection of a current flow through the associated capacitor of greater than a threshold current value. | 09-04-2014 |
| 20140375135 | Circuit Including a Switched Capacitor Bridge and Method - A method includes selectively coupling first and second input nodes of a capacitive bridge to first and second voltages, respectively, and selectively coupling first and second output nodes of the capacitive bridge to first and second output terminals, respectively, during a first phase of a clock cycle. The method further includes selectively coupling the first and second input nodes to the second and first voltages, respectively, and selectively coupling the first and second output nodes to the second and first output terminals, respectively, during a second phase of the clock cycle. | 12-25-2014 |
| 20160154385 | PROTECTION CIRCUIT TO PREVENT POWER-ON OPERATION MOTHERBOARD | 06-02-2016 |
| 20160172905 | Communication Failure Handling | 06-16-2016 |
| 307087000 | Attainment of voltage, frequency or phase relationship | 24 |
| 20080290735 | Remanent voltage generator tachometer and control for induction machine - In a power generating system the remanent voltage of an induction machine is measured. The frequency of the remanent voltage is compared to a predetermined threshold. When the frequency of the remanent voltage is greater than the predetermined threshold the induction machine is connected to the power grid. Induction machine is disconnected from power grid once generated power drops below a predetermined threshold. Once the induction machine is disconnected, it is prevented from being reconnected to the power grid until a predetermined time period elapses. | 11-27-2008 |
| 20090021082 | Generator Systems and Methods Using Timing Reference Signal to Control Generator Synchronization - A power generation system includes a generator configured to be connected to a bus. The system also includes a timing reference signal generator circuit configured to detect a timing variation of a voltage on the bus and to generate a timing reference signal from a timing reference other than the voltage on the bus in response to detection of the variation. The system further includes a generator control circuit configured to synchronize operation of the generator to the timing reference signal. | 01-22-2009 |
| 20090108678 | Power system with method for adding multiple generator sets - A method of operating a power system is provided. The power system has a plurality of generator sets and a bus. The method monitors the bus and generator sets disconnected from the bus. The method supplies to a control device information associated with the operating state of each of the generator sets and the bus. The method determines a relative frequency mismatch, multiplied by a first weight factor, and a relative phase mismatch, multiplied by a second weight factor, between the frequency and phase of the bus and a generator, and generates a frequency speed bias and a phase speed bias for the generator. The method adds the frequency and phase speed biases to form a total speed bias and connects the generator to the bus when the voltage, frequency, and phase of the generator are within a permissible range of the bus. | 04-30-2009 |
| 20090160260 | Electrical Generation Protection System - Distributed generation systems incorporate a distribution network and typically a number of distributed generators. It is possible that power islands may be created in substations incorporating a generator when that substation and generator is isolated from the distribution network by a circuit breaker. A problem arises when the power island is re-connected to the distribution network when the phase of electrical power supply in the previous power island is not synchronised with the power supply on the distribution network. Identifying such an out of phase nature is achieved utilising application of test reactances, both capacitative and inductive, across the whole distribution network such that such test reactances are substantially unbalanced within a particular substation and in particular a distribution path for a generator so that there is a test reactance load imbalance which will identify out of phase operation and therefore control activation of the circuit breaker. | 06-25-2009 |
| 20090167095 | CONNECTION AND DISCONNECTION SEQUENCE FOR VARIABLE SPEED WIND TURBINE HAVING AN EXCITER MACHINE AND A POWER CONVERTER NOT CONNECTED TO THE GRID - A variable speed wind turbine having a doubly fed induction generator (DFIG), includes an exciter machine mechanically coupled to the DFIG and a power converter placed between a rotor of the DFIG and the exciter machine. Thus, the power converter is not directly connected to the grid avoiding the introduction of undesired harmonic distortion and achieving a better power quality fed into the utility grid. Moreover, the variable speed wind turbine includes a power control and a pitch regulation. | 07-02-2009 |
| 20090189456 | System and Method for Coordinated Control and Utilization of Local Storage and Generation, with a Power Grid - Our system improves the efficiency and functionality of a grid-interactive or grid-tied power system that utilizes one or more local power sources and one or more local energy storage devices. The purpose is the coordination, optimization and efficient control, regulation, and transfer of electrical energy among several energy storage devices, power generators, the utility grid, and connected local electrical loads. The coordinated control and utilization of local storage and generation combined with coordinated integration with the utility grid results in an overall system that can be more flexible, economical, and efficient than any of the individual components can be, when operated separately. It uses dynamic adjustment, feedback, and other control modules/methods. | 07-30-2009 |
| 20090322155 | CHARGE OF EQUALIZATION APPARATUS WITH PARALLEL CONNECTION OF SECONDARY WINDINGS OF MULTIPLE TRANSFORMERS - The present invention relates, in general, to a charge equalization apparatus with series-connected battery cells and, more particularly, to a charge equalization apparatus, in which series-connected battery cells (B | 12-31-2009 |
| 20090322156 | REDUNDANT CURRENT SUPPLY WITH DIAGNOSTIC CAPABILITY AND A SUPPRESSOR - A circuit arrangement and method for redundantly supplying current to a downstream load are provided. The circuit arrangement includes a first current path including a first switch element to which a first voltage is applied on the input side, a second current path including a second switch element to which a second input voltage is applied on the input side, a first control device which is connected to the first current path and used to control the first switch element, a second control device which is connected to the second current path and used to control the second switch element, and a common output terminal of the first and second current paths, from which a load supply voltage is emitted. In a normal operating state, the first control device holds the first switch element in a let-through state and the second control device holds the second switch element in a let-through state, and in an abnormal operating state, depending on electrical properties of the first current path or the second current path, the control device which is located in the current path having weaker electrical properties transfers the switch element in the current path into a blocking state. | 12-31-2009 |
| 20100237705 | Arrangement Having Parallel-Connected DC Power Supply Units - An arrangement having DC power supply units connection parallel, wherein, the power supplies of the DC power supply units each generate a partial output current for supplying a load with a total output current. In accordance with the invention, an overload of power supply units when the power supply units are switched on and/or during their restart is largely avoided. | 09-23-2010 |
| 20110115302 | SYSTEM AND METHOD FOR SYNCHRONIZING AN AUXILIARY ELECTRICAL GENERATOR TO AN ELECTRICAL SYSTEM - There is provided herein methods and apparatus for apparatus for controlling the interconnection of an auxiliary AC generator with an electrical system, such as an electrical distribution system, e.g., a utility grid. A measuring circuit measures the frequency of an auxiliary AC generator and the phase angle between one voltage phase of the generator and the correspondent voltage phase of the electric utility's electricity supply lines, i.e., the grid, each of which are averaged and filtered. The measured frequency of the auxiliary AC generator is matched to the frequency of the electrical system and the measured phase angle of the generator is matched to the electric utility's electricity supply lines. Once matching is achieved to within a defined tolerance, interconnecting contactors are closed. | 05-19-2011 |
| 20110148214 | MANAGEMENT TECHNIQUES FOR ELECTRIC POWER GENERATION EQUIPMENT - A method for controlling power generation equipment, including bringing a generator online into a shared power bus environment, is described. The method includes determining whether the shared power bus is currently active, and whether a voltage determination fault is present with respect to a specific generator. Where the shared power bus is inactive and no fault is present, the generator is brought online in response to a load request. Where the shared power bus is active, the generator is synchronized with the shared power bus before the generator is brought online. | 06-23-2011 |
| 20110163607 | METHOD FOR SYNCHRONIZING AN ELECTRIC MACHINE WITH AN ELECTRIC GRID AND ARRANGEMENT OF AN ELECTRIC MACHINE AND AN ELECTRIC GRID - A method is provided for synchronizing an electric machine with an electric grid. The method includes synchronizing the frequency of a generator with a frequency of the grid, and regulating the voltage of the generator towards the voltage of the grid, by connecting the generator to the grid when the voltage of the generator reaches a first voltage value lower than the grid voltage. The present disclosure also provides arrangements of an electric generator and an electric grid. | 07-07-2011 |
| 20110210615 | MOTOR STARTING AND SWITCHING - A method of starting and apparatus for starting a multiphase electrical machine is disclosed. The aim is to reduce oscillatory pulsation in torque generated by the motor and inrush current that occurs shortly after start-up. The starting method comprises the steps of first connecting at least one, but less than all, of a plurality of windings to a respective phase-shifted supply voltage at a controlled point in the supply phase. Then, after a controlled delay following the first connection, connecting the or each remaining winding of the machine a respective phase-shifted supply voltage. The invention has particular application to multiphase (most usually, 3-phase) motors. However, it can also be applied to other electrical machines, such as generators and transformers. The method can be performed at initial start-up or, in the case of application to a motor, at Y-delta switchover. | 09-01-2011 |
| 20110215652 | SUBSTANTIALLY BUMPLESS TRANSFER GRID SYNCHRONIZATION - 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 |
| 20110248569 | APPARATUS AND CONTROL METHOD OF MICRO-POWER SOURCE FOR MICROGRID APPLICATION - The present invention relates to a micro-power source for successfully implementing a microgrid and to a control method for realizing smooth reconnection between the microgrid and an upper electric power system and smooth switching between the control modes of the micro-power source. A micro-power source sectionalizes an electric power system into an upper electric power system and a lower electric power system, and enables the lower electric power system to be independently operated in an island mode and to smoothly switch between a grid-connected mode and the island mode. As a result, a hierarchical microgrid is implemented with sectionalized sub-microgrids. One of the merits of the hierarchical microgrid is that each consumer group can be supplied with high quality power regardless of the power quality of the other consumer groups, and various types of services independently. | 10-13-2011 |
| 20110309684 | APPARATUS AND METHOD FOR THE ANTI-ISLANDING OF POWER CONDITIONING SYSTEM - There is provided an apparatus for the anti-islanding of a power conditioning system. The apparatus for the anti-islanding of a power conditioning system according to the present invention is applied to a power conditioning system including a DC/DC converter and a DC/AC inverter in order to transfer power from a solar cell array to a grid. The apparatus for the anti-islanding of a power conditioning system may include an injection signal generator generating an injection signal, an adder generating a final fundamental wave command value, a main controller performing the power control according to the final fundamental wave command value and stopping the operation of the power conditioning system when the level of the detected injection signal has reached the predetermined reference level or more, and an injection signal detector detecting the injection signal included in voltage and providing them to the main controller. | 12-22-2011 |
| 20120187770 | SYSTEM AND METHOD FOR SYNCHRONIZING MULTIPLE GENERATORS WITH AN ELECTRICAL POWER DISTRIBUTION SYSTEM - Systems and method for synchronizing power generators with a power grid are provided. One system among various implementations includes a plurality of synchronization modules, wherein each synchronization module corresponds to one power generator. The synchronization modules are configured to output a control signal to adjust a frequency of the respective power generator to correspond with the frequency of the existing power grid. The system also includes a central controller in communication with the plurality of synchronization modules. The central controller is configured to determine a propagation delay with respect to each synchronization module. The propagation delay is a measure of time for a signal to propagate from the respective synchronization module to the central controller. The central controller is further configured to send a control signal to each synchronization module to control when each synchronization module connects the respective power generator to the existing power grid. | 07-26-2012 |
| 20120205987 | ELECTRICAL PHASE SYNCHRONIZATION - The electrical phase synchronization technology includes a system, a method, and/or components thereof. In some examples, the electrical phase synchronization system includes an electrical power transmission network having a plurality of transmission lines and a plurality of electrical power generation devices. Each electrical power generation device includes an electrical power source and a control unit. | 08-16-2012 |
| 20120248881 | HIGH VOLTAGE BATTERY SYSTEM FOR VEHICLE APPLICATIONS - In one embodiment, a battery management system comprising a first circuit comprising a first plurality of circuit elements arranged in series, the first plurality of circuit elements comprising: a direct current (DC) voltage source, and first plural switching devices, each of the first plural switching devices connected to, and operably switched by, a first detection device associated with a battery module to cause a voltage difference responsive to detection of an event corresponding to operation of the battery module. | 10-04-2012 |
| 20130113295 | ENERGY HARVESTING SYSTEM AND METHOD - An energy harvesting system receives a low power input from an energy harvesting device such as a photovoltaic device or similar, and controls the storage of power in power management logic. The stored power eventually reaches a level that permits it to be supplied to power conversion block for supply of a regulated voltage to a load. | 05-09-2013 |
| 20130134790 | Grid Synchronisation - The invention relates to a grid synchroniser for connecting an AC output of a power converter to the AC grid mains. In one aspect the invention provides a grid synchroniser comprising an inverter controller to control an AC output of the inverter, the controller including a receiver to receive grid data from a grid sensor location remote from said inverter. In another aspect we describe techniques for rapid removal of charge from a control terminal of a power switching device such as a MOSFET, IGBT or Thyristor using a particular driver circuit. | 05-30-2013 |
| 20130320772 | RECHARGEABLE MULTI-CELL BATTERY - A method for power management of a multi-cell battery includes identifying a desired power value and voltage value, determining a battery voltage value and a battery current value for a battery, determining a number of battery banks from a plurality of battery banks to use for the battery, where each battery bank includes one or more battery cells (or battery modules), checking availability of each of the one or more battery cells (or battery modules), selecting one or more battery banks from the plurality of battery banks, where the selection of a battery bank is based on the availability of the battery cells (or battery modules) included in the battery pack, and a quantity of the selected battery banks is equal to the determined number of battery banks, and connecting the available battery cells (or battery modules) in the selected one or more battery banks to form the battery. | 12-05-2013 |
| 20140001873 | METHOD AND DEVICE FOR CONTROLLING INTERNAL COMBUSTION ENGINE DRIVEN GENERATOR SET TO RUN IN PARALLEL | 01-02-2014 |
| 20140167517 | POWER SUPPLY SYSTEM - A power supply system ( | 06-19-2014 |
