Class / Patent application number | Description | Number of patent applications / Date published |
322021000 | With line-drop compensation | 19 |
20110101927 | POWER GENERATION SYSTEM AND METHOD WITH VOLTAGE FAULT RIDE-THROUGH CAPABILITY - A power generation system includes a generator mechanically coupled to a turbine to generate electrical power. The system includes a fault ride through system having a variable resistor and a variable inductor. The variable resistor is connected in parallel across output terminals of the generator to absorb power from the generator during a grid fault condition, and the variable inductor is connected between an output terminal of the generator and a power grid. | 05-05-2011 |
20110215772 | PROTECTION DEVICE AND PROTECTION METHOD FOR THROUGH POWER NETWORK FAULT OF DOUBLE-FED INDUCTION GENERATOR - The invention discloses a power grid fault ride-through device and a method for a doubly fed induction generator. The device comprises a controller and a crowbar circuit, the controller is in controlled connection with a generator-side converter and a grid-side converter of the doubly fed induction generator and the crowbar circuit, a three-phase input end of the crowbar circuit is connected with a connection end of a du/dt inductance and the generator-side converter, the crowbar circuit comprises a switch circuit and a drive circuit which is in driving connection with the switch circuit, the controller is in controlled connection with the drive circuit, the switch circuit comprises a bridge circuit comprising full-controlled power electronic devices as constituent elements, and a three-phase input end of the switch circuit is connected to the three-phase input end of the crowbar circuit; and with the device, the method comprises the following steps of closing the generator-side converter and triggering the conduction of the switch circuit in case that a power grid dips to the condition that rotor current is equal to or larger than a conduction threshold value, and switching off the switch circuit in case that rotor current is equal to or smaller than a switch-off threshold value. The invention prolongs the service life of the crowbar circuit and improves the working reliability of the crowbar circuit, and has simple structure and easy implementation. | 09-08-2011 |
20110248686 | METHOD FOR THE OPERATION OF A WIND ENERGY PLANT AT SUDDEN VOLTAGE CHANGES IN THE GRID - A method for the operation of a wind energy plant with a rotor, which transfers a driving moment to a generator via a drive train, wherein the generator provides a pre-settable generator moment acting opposite to the driving moment and is connectable to a grid, characterised in that after a sudden voltage change in the grid, the generator moment is controlled depending from the phase position of a torsional vibration of the drive train. | 10-13-2011 |
20110316490 | CURRENT SOURCE CONVERTER-BASED WIND ENERGY SYSTEM - Switching control systems and methods are presented for controlling power conversion systems to provide electrical power to a grid or other load in which a synchronous machine is driven by a wind turbine or other prime mover to provide generator power to a switching type current source converter (CSC), with a current source rectifier (CSR) of the CSC being switched to provide d-axis control of the synchronous machine current based on grid power factor feedback, and with a current source inverter (CSI) of the CSC being switched to provide leading firing angle control and selective employment of dumping resists to dissipate excess generator energy in a fault mode when a grid voltage drops below a predetermined level. | 12-29-2011 |
20120001598 | ROTARY ELECTRIC MACHINE IMPROVED TO CARRY OUT LOAD-DUMP PROTECTION - In a rotary electric machine, a load-dump protector turns on a switching element as a low-side rectifying element for at least one of plural-phase stator windings when the output voltage exceeds a first threshold voltage due to load dump. The load dump protector determines a turnoff timing of the switching element as the low-side rectifying element for the at least one of the plural-phase stator windings after the output voltage, which exceeded the first threshold voltage once, falls below a second threshold voltage. The second threshold voltage is set to be lower than the first threshold voltage. The load dump protector turns off, at the determined turnoff timing, the switching element as the low-side rectifying element for the at least one of the at least two-phase stator windings. | 01-05-2012 |
20120007568 | ROTARY ELECTRIC MACHINE IMPROVED TO CARRY OUT LOAD-DUMP PROTECTION - A rectifying unit rectifies an alternating current voltage induced across each of at least two-phase stator windings. A turn-on unit monitors an output voltage of the rectifying unit, and turns on a switching element as a low-side rectifying element for at least one of the at least two-phase stator windings when the output voltage exceeds a first threshold voltage due to load dump. After the output voltage, which exceeded the first threshold voltage once, falls below a second threshold voltage, a turnoff unit waits for turnoff of the switching element until a turnoff time suited for preventing occurrence of a surge across the at least one of the at least two-phase stator windings appears. The second threshold voltage is set to be lower than the first threshold voltage. The turnoff unit turns off, at the appearance of the turnoff time, the switching element. | 01-12-2012 |
20120133342 | WIND TURBINE GENERATOR AND SURPLUS ENERGY CONTROL METHOD FOR WIND TURBINE GENERATOR - A wind turbine generator includes a synchronous generator that generates electric power via rotation of a rotor provided with blades that receive wind and that supplies the generated electric power to a utility grid, and a sea water resistor in which sea water serves as a resistive element. When the output power of the synchronous generator drops suddenly because of a momentary power interruption caused by a fault occurring on the utility grid, thus producing surplus energy, the sea water resistor consumes, in the form of electric power, the surplus energy that cannot be supplied to the utility grid from among the electric power generated at the synchronous generator. Because the sea water resistor uses sea water as the resistive element, the problem of heat generation hardly ever arises, and because the sea water can be easily exchanged, it is not affected by lifetime or on-time limitations. | 05-31-2012 |
20120133343 | WIND TURBINE HAVING A HIGH-VOLTAGE RIDE THROUGH (HVRT) MODE - A wind turbine connected to a power grid is provided. The wind turbine is selectively activated to operate at a high-voltage ride through (HVRT) mode. The wind turbine includes a grid voltage circuit, a DC bus, a voltage source, and a dynamic brake. The grid voltage circuit monitors a fundamental voltage of the power grid and activates the HVRT mode if the fundamental voltage is at least about equal to a threshold voltage value. The DC bus has a DC bus voltage. The voltage source provides a DC bus rated voltage. The dynamic brake has a brake chopper and a resistive element. The dynamic brake is connected to the DC bus. The dynamic brake is connected to the voltage source if the HVRT mode is activated. | 05-31-2012 |
20130049707 | DC CHOPPER AND DC CHOPPING METHOD FOR DOUBLY FED INDUCTION GENERATOR SYSTEM - A DC chopper comprising a control unit and a power circuit and a DC chopping method for a DFIG (doubly fed induction generator) system are provided. The input terminal of the control unit is coupled to a DC capacitor of a converter to detect a DC voltage. The power circuit includes input terminals, an overvoltage protection module, a rectifier module and output terminals. The overvoltage protection module comprises at least one discharge unit formed from a discharge resistor and a switch element, and the rectifier module is coupled in parallel to the overvoltage protection module. When a grid voltage drops, the control unit outputs a corresponding control signal to drive the switch element to be ON or OFF, and the output terminal of the power circuit absorbs a portion of rotor inrush current, so as to impose over-current protection. | 02-28-2013 |
20130249501 | DOUBLE FED INDUCTION GENERATOR (DFIG) CONVERTER AND METHOD FOR IMPROVED GRID FAULT RIDETHROUGH - A double fed induction generator (DFIG) converter method are presented in which rotor side current spikes are attenuated using series-connected damping resistance in response to grid fault occurrences or grid fault clearances. | 09-26-2013 |
20140239921 | ENGINE-GENERATOR WITH LOAD BANK AND CONTROL SYSTEM - A load bank comprises one or more load resistors connected to an engine-generator and a control system for maintaining a minimum generator load when necessary for optimal operation. The control system operates the load bank to mitigate harmful effects of generator neglect and maintains loading for efficient DPF regeneration while allowing the generator to quickly dump the load bank when real load increases. | 08-28-2014 |
20140333268 | SYSTEM AND METHOD FOR IMPROVING RESPONSE TIME OF A BRAKING UNIT - A braking system includes a converter, a capacitor coupled to an output of the converter, a bridge coupled in parallel to the capacitor, and at least one inductor coupled to the bridge, an electrically conductive disc disposed proximate to the at least one inductor, and a switching unit controller for commanding the converter to convert a level of voltage supplied therefrom from a first voltage level to a second voltage level and thereby increase energy stored in the capacitor, and, upon receiving a brake command, commanding the bridge to ramp-up electrical current in the at least one inductor so as to induce an electromagnetic force on the electrically conductive disc. | 11-13-2014 |
20150042293 | ENERGY PRODUCTION PLANT, IN PARTICULAR WIND TURBINE - An energy production plant has a drive train including a differential gear ( | 02-12-2015 |
20150077067 | FAULT-TOLERANT WIND ENERGY CONVERSION SYSTEM - This disclosure is directed to a fault-tolerant energy conversion system. A fault-tolerant doubly-fed induction generator (DFIG) for use with a wind energy conversion system (WECS) consistent with the present disclosure may allow for seamless operation during all kinds of grid faults. In one embodiment, a six-switch grid side converter (GSC) commonly used with such systems may be replaced with nine-switch converter circuitry. With three additional switches, the nine-switch converter can provide two independent three phase outputs. For example, one three-phase output may be coupled to the grid through interfacing inductors to realize normal GSC operation, while the other three-phase output may be coupled to neutral side of the stator windings to provide fault ride-through (FRT) capability to the DFIG. A control algorithm may be employed that both achieves seamless fault ride-through during any kind of grid faults and strictly satisfies grid codes requirements. | 03-19-2015 |
20150102782 | VEHICLE-MOUNTED ELECTRIC ROTATING MACHINE - A vehicle-mounted electric rotating machine includes a field winding wound on a rotor for magnetizing a field pole of the rotor, a stator winding for generating an AC voltage in accordance with a rotating magnetic field generated by the field pole, a power converter for converting the AC voltage to a DC voltage and outputting the DC voltage through a first power supply line connected to an output terminal thereof, and a load dump handling section for performing a load dump protection operation when a voltage of the output terminal of the power converter exceeds a threshold voltage. The load dump handling section is supplied with operating power through a second power supply line provided separately from the first power supply line. | 04-16-2015 |
20150115902 | POWER GENERATION SYSTEM AND METHOD WITH FAULT RIDE THROUGH CAPABILITY - A power generation system includes a generator mechanically coupled to an engine to generate electrical power and a fault ride through system connected between the generator and a power grid. The fault ride through system includes a mechanical switch connected in parallel with a solid state switch and a resistor to absorb power from the generator during a grid fault condition. The mechanical switch and the solid state switch are controlled in coordination with the engine. | 04-30-2015 |
20150137771 | POWER GENERATION SYSTEM AND METHOD WITH FAULT RIDE THROUGH CAPABILITY - A power generation system includes a generator mechanically coupled to an engine to generate electrical power and a fault ride through system connected between the generator and a power grid. The fault ride through system includes a mechanical switch connected in parallel with a solid state switch and a controller for controlling the mechanical switch, the solid state switch and ignition of the engine in coordination. | 05-21-2015 |
20150303681 | DEVICE AND METHOD FOR INCREASING FAULT CLEARING TIME - A device for increasing fault clearing time is provided having a component part designed to identify a short circuit event and load resistors connectable in the event of a fault such that the turbine power transmitted to the shaft is electrically absorbed by the generator and converted into heat until the grid comes back online. | 10-22-2015 |
20150333501 | Wind Turbine and Method for Controlling the Electrical Moment of a Wind Turbine by Closed-Loop Control in the Event of a Grid Fault - The invention relates to a method for controlling the electrical moment of a wind turbine by closed-loop control in the event of a grid fault. A fall in voltage that is outside the limits of normal operation is discovered. A moment closed-loop controller which determines a target value for the electrical moment of the wind turbine, is operated. A moment ramp is initialized. The target value of the moment closed-loop controller is compared with the moment ramp and the lesser value is selected as a moment setpoint value. The electrical moment of the wind turbine is set on the basis of the moment setpoint value. The invention additionally relates to a wind turbine suitable for implementing the method. The invention makes it possible, on the one hand, to achieve a rapid restoration of the power after the end of the grid fault, while, on the other hand, the loads for the wind turbine are kept within limits. | 11-19-2015 |