Generator Protective Circuits Patents (Class 361/20)
  • Patent number: 10969751
    Abstract: A method for determining parameters for controlling N electric generators at an instant t, the method including, for a required power Ptot(t)=?i=1NPi(t) at an instant t with Pi(t) the electric power supplied by the electric generator i at the instant t and a reserve power Preserve(t)??i=1N(Pimax?Pi(t)×?i(t) at an instant t with Pimax the maximum power that the electric generator i can develop and ?i(t) the coefficient of activation of the electric generator i which is equal to 1 when the electric generator is on and 0 when the electric generator is off, a step of determining the optimal power Piopt(t) at the instant t associated with each electric generator i so as to minimise the fuel consumption per unit of electrical energy produced sfc ? ( t ) = 1 P tot ? ( t ) ? ? i = 1 N ? f i ? ( P i ? ( t ) ) × P i ? ( t ) with fi(x) the function giving the fuel consumption of the electric generator i for the electric power x.
    Type: Grant
    Filed: November 13, 2019
    Date of Patent: April 6, 2021
    Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
    Inventor: Duy Long Ha
  • Patent number: 10964504
    Abstract: The movable body includes a pivot and a contact portion. The pivot is rotatably supported. The contact portion is disposed at a position contactable with a contact piece. The movable body rotates around the pivot and presses the contact piece via the contact portion to move the second contact close to the first contact. The actuator presses the movable body to rotate the movable body around the pivot. The contact piece has a curved portion located between the second contact and the support. The pivot is located on a side where the support is disposed with respect to the curved portion. The actuator includes a pressing member which presses the movable body. The pressing member moves in an axial direction of the pressing member to press the movable body.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: March 30, 2021
    Assignee: OMRON Corporation
    Inventors: Seiki Shimoda, Yuichiro Teshima, Akira Tsurusaki
  • Patent number: 10648454
    Abstract: A wind turbine system comprising a plurality of wind turbines mounted to a common support structure, wherein each of the plurality of wind turbines includes a rotor and a power generation system driven by the rotor, wherein the wind turbine system further comprises: localised control means including a plurality of local control modules, wherein each of the local control modules is operable to monitor the operation of a respective one of the plurality of wind turbines, and to issue local control commands thereto to achieve a set of local control objectives; and centralised control means configured to monitor the operation of the wind turbine system and provide centralised control commands to the plurality of wind turbines in order to achieve a set of supervisory control objectives associated with at least two of the plurality of wind turbines.
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: May 12, 2020
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventor: Erik Carl Lehnskov Miranda
  • Patent number: 10581354
    Abstract: A method for detecting a fault in a generator unit that has an electrical machine including a rotor winding and a stator winding and a rectifier connected thereto, via which the electrical machine is connected to an electrical system of a motor vehicle. Whether or not the fault exists is determined as a function of an excitation current traversing the rotor winding of the electrical machine and as a function of a setpoint value of the excitation current.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: March 3, 2020
    Assignee: Robert Bosch GmbH
    Inventor: Zoltan Ersek
  • Patent number: 10519930
    Abstract: The control of the power output of wind turbine generator that operates in a derated mode to generate a produced power output level lower than an available power level. A pitch system sets the blade pitch of a rotor to a pitch value based on the received power reference signal. A power system controls the produced power output level of the wind turbine to the requested power output level. Moreover, the blade pitch of the rotor is further controlled by a pitch feedback control loop that modifies the pitch value based on a difference between the produced power output level and the requested power output level.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: December 31, 2019
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Martin Ansbjerg Kjær, Jesper Sandberg Thomsen
  • Patent number: 10389125
    Abstract: Systems and methods for providing generated power to a power grid subject to active power, reactive power and voltage requirements during varying conditions. An expanded reactive follower for distributed generation including but not limited to wind power plant and solar power plants and loads of other reactive controllers; that includes at least one reactive power generator coupled to an electric power system with a distributed power plant. The reactive power generator (e.g. a rapidly switched capacitor bank with fast reinsertion resistors, or inverter based reactive power generator) is located on either side of the point of interconnection of the power plant. A reactive follower controller controls the reactive power generator on the basis of an estimated reactive power commanded by a reactive power management system for distributed generation plant (e.g. Solar, Wind, Battery, etc. . . . ).
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: August 20, 2019
    Inventor: Thomas Alexander Wilkins
  • Patent number: 10197608
    Abstract: An apparatus for determining insulation resistance at a PV generator includes a first unit configured to shift a generator potential at an output terminal of the PV generator, and a second unit. The second unit is configured to determine the insulation resistance by: connecting a measurement voltage to the output terminal of the PV generator, measuring a first current value and a first voltage value at the output terminal of the PV generator before the measurement voltage is connected, measuring a second current value and a second voltage value at the output terminal of the PV generator after the measurement voltage is connected, and determining the insulation resistance of the PV generator based on the measured first and second current values and the measured first and second voltage values. The first and second units are connected in series.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: February 5, 2019
    Assignee: SMA Solar Technology AG
    Inventors: Mario Willenberg, Dirk Hermeling, Volker Bergs, Karl Nesemann
  • Patent number: 10177691
    Abstract: A power tool is provided including a brushless direct-current (BLDC) electric motor having a stator and a rotor. The power tool includes power switches including high-side switches and low-side switches disposed on a direct-current (DC) bus line between a power supply and the electric motor, and a controller configured to electronically brake the motor by simultaneously closing the high-side switches or the low-side switches to electrically short the stator windings. In an embodiment, the controller is configured to monitor a voltage of the DC bus line, and if the voltage of the DC bus line is lower than a voltage threshold, execute electronic braking by toggling between closing the high-side switches and closing the low-side switches over braking cycles, and if the voltage of the DC bus line is greater than the voltage threshold, execute braking by closing only the high-side switches or the low-side switches over the braking cycles.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: January 8, 2019
    Assignee: Black & Decker Inc.
    Inventors: Scott J. Eshleman, Tal Gottesman
  • Patent number: 10109994
    Abstract: Provided herein are improved current monitoring systems for monitoring currents having large ranges. A current monitor can include two or more current sensors. At least two of the current sensors can have different current measurement ranges and different current measurement sensitivities. Each current sensor can be associated with one or more current monitoring thresholds. A time delay or time threshold can correspond to each current monitoring threshold. Each current sensor can monitor a same current having a large range of possible current values. When a predetermined current threshold is exceeded for an amount of time exceeding a corresponding time threshold, a signal can be generated by the current sensor. The generated signal can indicate that the measured current exceeds the predetermined current threshold for the corresponding predetermined period of time.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: October 23, 2018
    Assignee: Littelfuse, Inc.
    Inventor: James Riley
  • Patent number: 10063174
    Abstract: The present disclosure is directed to a system and method for controlling an electrical power system connected to a power grid. The method includes determining, via a negative sequence regulator programmed in a controller of the electrical power system, a negative sequence component of at least one electrical condition of the electrical power system. Further, the method includes determining a desired current response based on the negative sequence component of the at least one electrical condition of the electrical power system. Thus, the method also includes determining a control command for the power converter as a function of the desired current response so as to achieve a desired relationship between a voltage condition in the power grid and the negative sequence component of the electrical condition of the electrical power system.
    Type: Grant
    Filed: August 8, 2016
    Date of Patent: August 28, 2018
    Assignee: General Electric Company
    Inventors: Einar Vaughn Larsen, Wei Ren, Dustin Howard, Alfredo Sebastian Achilles
  • Patent number: 9874198
    Abstract: Method of operating a wind turbine having a tower, a rotor with a plurality of blades arranged on the tower, one or more pitch systems for pitching the blades, a system for determining an instantaneous representative wind speed, and a system for determining a distance between a blade and the tower. The method comprises determining the instantaneous representative wind speed, and determining the distance between the tower and one of the blades when said blade is in the shadow of the tower. The method further comprises determining a tower distance pitch adjustment depending on the determined distance between the tower and the blade in the shadow of the tower and on the determined instantaneous representative wind speed. The method still further comprises the one or more pitch systems applying the determined tower distance pitch adjustment to at least the next blade to be in the shadow of the tower.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: January 23, 2018
    Assignee: ALSTOM Renewable Technologies
    Inventor: Marc Canal Vila
  • Patent number: 9837812
    Abstract: An example method of operating a power distribution system including a plurality of source and tie circuit protection devices coupled between at least one source and a protection zone is disclosed. The protection zone includes a distribution bus and a plurality of feeder circuit protection devices coupled between the distribution bus and a plurality of loads. The method includes determining an electric current flowing through each source and tie circuit protection device, determining whether any of the feeder circuit protection devices is outputting a ZSI blocking signal, and controlling operation of the plurality of source and tie circuit protection devices according to an enhanced partial differential protection scheme based on a combination of the determined currents through the source and tie circuit protection devices and the determination of whether any of the feeder circuit protection devices is outputting a ZSI blocking signal.
    Type: Grant
    Filed: November 20, 2014
    Date of Patent: December 5, 2017
    Assignee: General Electric Company
    Inventors: Marcelo Esteban Valdes, Ilia Voloh
  • Patent number: 9819196
    Abstract: A power distribution system capable of automatic fault detection includes a lateral, a switch unit and a feeder terminal unit. The switch unit includes a circuit breaker coupled for transmitting electrical power to the lateral when making electrical connection, and a protection relay to provide a control signal that causes the circuit breaker to break electrical connection upon determining that the magnitude of a current provided by the circuit breaker is greater than a threshold current value. The feeder terminal unit detects whether or not the protection relay generates the control signal, so as to determine whether or not a fault has occurred in the lateral.
    Type: Grant
    Filed: June 5, 2015
    Date of Patent: November 14, 2017
    Assignee: I Shou University
    Inventors: Chao-Shun Chen, Te-Tien Ku, Chia-Hung Lin, Cheng-Ting Hsu
  • Patent number: 9715261
    Abstract: Methods and apparatus for dynamically balancing at least one load characterized by an associated energy reservoir with at least one renewable energy source where both the load and the renewable energy source coupled to a power transmission system. A central controller regulates energy delivery to one or more loads over the power transmission system by anticipating energy demand over an interval of time, accounting for the status of the associated energy reservoir. Each load is linked with at least one renewable energy source. The anticipated energy demand is synchronized with delivery of energy by the renewable energy source by commands delivered to a local switching and monitoring device coupled to the load and subject to override by a local user.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: July 25, 2017
    Inventors: Thomas Alexander Wilkins, Charles Grunewald
  • Patent number: 9709034
    Abstract: Methods, controllers and computer program products for controlling a wind turbine. Under de-rated operating conditions in which the power requested from a wind turbine is less than the available power, a controller adjusts blade pitch of the wind turbine to reduce the rotor power coefficient. The captured wind power is thereby reduced to be approximately equal to the requested electrical power, which is less than either the available power or the rated power of the wind turbine generator. This reduction in captured power provides the controller with an additional degree of freedom that allows the controller to increase the electrical power output of the wind turbine in response to wind fluctuations without damaging the wind turbine. By allowing increases in power under de-rated conditions, the controller may reduce the amount of pitching necessary to prevent the turbine from exceeding its rated power output level.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: July 18, 2017
    Assignee: VESTAS WIND SYSTEMS A/S
    Inventors: Martin Ansbjerg Kjær, Eik Herbsleb
  • Patent number: 9588557
    Abstract: Systems and methods for providing generated power to a power grid subject to reactive power requirements. A reactive follower includes a reactive power generator coupled to a distributed power plant via a series impedance such as a step-up transformer. A reactive follower controller controls the reactive power generator on the basis of an estimated reactive power commanded by a reactive power management system and includes multi-variable control logic to determine when to increase reactive power produced by the reactive power generator based on the reactive power commanded by the distributed reactive power management system and point-of-interconnection measurements of power, reactive power, and voltage.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: March 7, 2017
    Inventors: Thomas Alexander Wilkins, Charles Grunewald, Matthew R. Hadsell
  • Patent number: 9293908
    Abstract: Method for protecting an electrical energy distribution box, the electrical energy distribution box comprising a set of distribution bars intended to be connected between a generator and loads, each of the bars being able to transfer at least a part of the electrical energy passing through it to at least one other bar of the set of bars. According to this method, the incoming and outgoing currents of a single distribution bar are measured and a fault in the set of bars is detected on the basis of the currents measured in the said bar.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: March 22, 2016
    Assignee: ECE
    Inventor: Jérôme Jean-Louis Comeil Valire
  • Patent number: 9188620
    Abstract: A power conversion and distribution system detects faults by monitoring differential current and differential power at certain locations in the system. Current loss faults are detected based on the monitored differential current, and series arc faults are detected based on the monitored differential power. A system controller may make the fault determinations and disable a power converter circuit of the power conversion and distribution system in response to detection of a fault.
    Type: Grant
    Filed: June 2, 2014
    Date of Patent: November 17, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Carl A. Wagner
  • Patent number: 9093240
    Abstract: A method, system, and computer program product for detecting and interrupting a ground fault in a direct current (DC) power circuit are provided in the illustrative embodiments. A first value of a first current flow over a first part of the DC power circuit is compared with a second value of a second current flow over a second part of the DC power circuit. A voltage is generated, wherein the voltage is proportional to a difference between the first and the second values. Responsive to the voltage exceeding the threshold voltage for a threshold time, a signal output is produced, the signal configured to cause a short-circuit in the first part of the DC power circuit. The first part of the DC power circuit is interrupted responsive to the short-circuit.
    Type: Grant
    Filed: May 15, 2013
    Date of Patent: July 28, 2015
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Steven John Ahladas, Vincent P. Mulligan, Edward Joseph Seminaro
  • Patent number: 9035782
    Abstract: A transfer switch configured to detect a ground current is configured to selectively connect a first power source or a second power source to a load. Each of the power sources includes at least one “hot” lead and one neutral lead, and the transfer switch is configured to switch both the “hot” and the neutral leads. If the neutral switching portion of the transfer switch fails, current may be supplied to the load via the “hot” lead of one of the power sources and return from the load via a ground conductor and the neutral lead of the other power source. The transfer switch includes a current sensor, detecting current on the ground conductor, in order to detect such a condition. The signal from the current sensor is provided to a control circuit, which, in turn, activates an indicator if the current on the ground conductor exceeds a predefined level.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: May 19, 2015
    Assignee: Reliance Controls Corporation
    Inventor: Michael O. Flegel
  • Patent number: 9014995
    Abstract: A collector monitoring system is disclosed. In one embodiment, the collector monitoring system includes: a sensor connected to an interior surface of a dynamoelectric machine housing, the sensor for sensing a condition of a collector during operation of a dynamoelectric machine; and a diagnostic system operably connected to the sensor, the diagnostic system configured to: obtain data about the condition of the collector from the sensor; compare the data about the condition of the collector with a predetermined condition threshold; and provide an indicator of a collector fault in response to the data about the condition of the collector exceeding the predetermined condition threshold.
    Type: Grant
    Filed: January 4, 2012
    Date of Patent: April 21, 2015
    Assignee: General Electric Company
    Inventors: Cesar Everardo Castillo, Ruben Jeevanasan Fair, Ronald Irving Longwell, Haiyan Sun, Karim Younsi
  • Publication number: 20150098156
    Abstract: An arc flash mitigation system for use with a generator excitation system is provided. An exemplary arc flash mitigation system includes three semiconductor fuses, three current transformers, an overcurrent detection circuit, a gate firing circuit, and three pairs of thyristors respectively arranged in an anti-parallel phase-to-phase configuration. An exemplary method includes detecting an overcurrent and providing a gate signal to each of a plurality of thyristors included in a crowbar circuit.
    Type: Application
    Filed: October 4, 2013
    Publication date: April 9, 2015
    Applicant: General Electric Company
    Inventors: Joseph Clark Rowny, JR., John Earl Bittner
  • Patent number: 9000611
    Abstract: One embodiment of the present application is directed to a protection technique for an electric power generation system. In one or more implementations, an electric power generator, generator control circuitry, electrical output sensors to provide one or more corresponding signals, electrical switching equipment to selectively couple the generator to an electrical load, and electric power feeder or branch circuit conductors, to route electric power from the generator to the switching equipment, are provided. The control circuitry is responsive to the sensor signals to determine if a shutdown condition exists as a function of a protection profile determined for the system. This profile may account for damage thresholds of the generator, the feeder or branch circuit conductors, the electrical switching equipment for each of a number of different combinations of level and duration of electrical output as represented by the sensor signals.
    Type: Grant
    Filed: April 20, 2009
    Date of Patent: April 7, 2015
    Assignee: Cummins Power Generation IP, Inc.
    Inventors: Rick A. Lorenz, J. Bruce Schelkopf
  • Patent number: 8953287
    Abstract: A mobile generator for generating a direct voltage for a tool supplied with direct current includes an alternating-voltage generator (1), an electronic control unit (3), a rectifier unit (2), which has a direct-voltage output (6) with live conductors (9, 10) for connecting the tool (11), and a protective device (14). The protective device is between the live conductors (9, 10) and a protective potential (18), especially ground or a protective wire. The protective device (14) has an insulating spark gap (15) responding in the case of an error with a defined response voltage (UT) for grounding the live conductors (9, 10).
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: February 10, 2015
    Assignee: KW-Generator GmbH & Co. KG
    Inventors: Michael Werner, Michael Kurz
  • Patent number: 8946928
    Abstract: The proposed system has a plurality of generator systems, each generator system having an alternating current generator directly connected to a rectifier. The alternating current generator is rotationally coupled to a prime mover, wherein, upon operation of the prime mover, the alternating current generator produces an alternating current output , is de-synchronized to further ones of the plurality of generator systems and has a variable generator speed. The rectifier directly connected the alternating current generator is adapted to convert the alternating current output of the alternating current generator into a direct current output. A direct current distribution bus is coupled to the direct current outputs from each of the rectifiers. The system further has a plurality of inverters adapted to receive power from the direct current distribution bus, the output of each inverter being adapted to drive an alternating current motor.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: February 3, 2015
    Assignee: Siemens Aktiengesellschaft
    Inventor: Ove Boe
  • Patent number: 8947837
    Abstract: An overcurrent fault protection method includes detecting an overcurrent fault in a variable frequency electric power generation system having a first main generator connected to a first alternating current bus through a first generator line contactor, a second main generator connected to a second alternating current bus through a second generator line contactor and an auxiliary power generator connected to a plurality of bus tie contactors, through a third generator line contactor, and connected to at least one of the first and second alternating current buses through the plurality of bus tie contactors, in response to detecting the overcurrent fault, locking out one or more of the plurality of bus tie contactors and in response to a continued detection of the overcurrent fault, opening at least one of the first second and third generator line contactors.
    Type: Grant
    Filed: April 12, 2012
    Date of Patent: February 3, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Nebojsa Novakovic, Jef William Good
  • Patent number: 8941955
    Abstract: An example method of detecting a generator overvoltage condition includes predicting a primary control current to provide a predicted control current, monitoring the primary control current, and detecting a generator overvoltage condition based on a comparison of the predicted control current to the primary control current. The method interrupts the primary control current based on the comparing.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: January 27, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Carl A. Wagner, John F. Defenbaugh, Vijay K. Maddali, Richard L. Young
  • Publication number: 20140334044
    Abstract: A rotary electric machine for a vehicle is provided. The rotary electric machine includes a power system circuit which has a power element and is grounded via a first ground terminal and a first connecting line and a control system circuit which controls the power system circuit and is grounded via a second ground terminal and a second connecting line.
    Type: Application
    Filed: May 9, 2014
    Publication date: November 13, 2014
    Inventors: Harumi HORIHATA, Tadatoshi ASADA, Takahisa KOYASU
  • Publication number: 20140268430
    Abstract: An autonomous breaker can apply a current through a high impedance source to a bus coupled to either end of a breaker in order to measure an impedance of the bus. The status of the bus can be determined from the measurement. Based on the determined status, a fault detection procedure can be selected and implemented to determine if a fault exists on the bus. When the fault detection procedure has been implemented and no fault has been detected, the breaker can close, and thus couple the bus to another bus.
    Type: Application
    Filed: March 13, 2014
    Publication date: September 18, 2014
    Applicant: Transocean Sedco Forex Ventures Limited
    Inventor: Edward Peter Kenneth Bourgeau
  • Publication number: 20140211344
    Abstract: An electric vehicle is provided having an electric generator and a motor. Generated electrical energy may be routed to a DC bus of an inverter system. The inverter system may be configured to provide the electrical energy to the motor. A controller may detect a fault based on the voltage level of the DC bus.
    Type: Application
    Filed: January 28, 2013
    Publication date: July 31, 2014
    Applicant: Deere & Company
    Inventors: Jacob Pence, Eric Vilar
  • Patent number: 8792217
    Abstract: Various embodiments disclosed herein provide protection to monitored equipment at both a local level and a system level, in order to offer more comprehensive protection. In one particular embodiment, the protected equipment may include one or more generators. The protection system may utilize time-synchronized data in order to analyze data provided by systems having disparate sampling rates, that are monitored by different equipment, and/or equipment that is geographically separated. Various embodiments may be configured to utilize a variety of sampling rates.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: July 29, 2014
    Assignee: Schweitzer Engineering Laboratories Inc
    Inventors: Saurabh B. Shah, Kamal Garg, Scott M. Manson
  • Publication number: 20140177108
    Abstract: A power system that supplies electrical power to at least one load is disclosed. The power system may include an electrical power generator, current sensors configured to provide current signals representative of currents output from the electrical power generator to the load, and voltage sensors configured to provide voltage signals representative of voltages output from the electrical power generator to the load. The power system may also include a controller configured to receive the current signals and the voltage signals, compare the current signals and the voltage signals to a predetermined map, determine whether a short circuit exists inside the electrical power generator based on the comparison, and send a command to turn off the electrical power generator when the short circuit exists inside the electrical power generator.
    Type: Application
    Filed: December 20, 2012
    Publication date: June 26, 2014
    Applicant: Caterpillar Inc.
    Inventors: Paul Curtis PAWELSKI, Ryan Christopher BYRD
  • Patent number: 8760094
    Abstract: An apparatus and method for protecting a power system comprising a generator providing power to an alternating current bus, a power converter for converting alternating current power on the alternating current bus to direct current power on a direct current bus, and a direct current load powered by the direct current power on the direct current bus. An undesired condition is identified at the input to the power converter from the alternating current bus. The undesired condition is caused by at least one of the power converter, the direct current bus, or the load. The power converter is disconnected from the alternating current bus in response to identifying the undesired condition for at least a time delay. The time delay is selected such that the power converter is disconnected from the alternating current bus before the alternating current bus is disconnected from the generator due to the undesired condition.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: June 24, 2014
    Assignee: The Boeing Company
    Inventors: Eugene V. Solodovnik, Jeffrey J. White
  • Patent number: 8716885
    Abstract: A switching assembly includes a first terminal and a second terminal, a first switch connected to the first terminal, and a second switch connected to the second terminal. The switching assembly further includes a rectifier bridge connected between the first switch and the second switch, and a third switch connected between the first terminal and the second terminal. The switching assembly also includes a control unit that selectively opens and closes the first switch, the second switch and the third switch, and selectively turns on and off the rectifier bridge.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: May 6, 2014
    Assignee: Thomas & Betts International, Inc.
    Inventors: Hans-Erik Pfitzer, Adil Oudrhiri
  • Patent number: 8718832
    Abstract: To prevent disconnection of wind turbine generators due to changes in wind conditions even if the wind turbine generators is operated to limit the power output. A plurality of wind turbine generators that generate electric power by the rotation of rotors are provided in a wind farm are interconnected and are operated while the power outputs are limited in advance so as to be able to further supply electric power to a utility grid in response to a decrease in the frequency or voltage of the utility grid. The rotational speed of the rotor, which is a physical quantity related to increase and decrease in the power output of the wind turbine generator, is measured for each of the wind turbine generators by a wind-turbine control system, and the limitation amount of the power output of the wind turbine generator is set for each of the wind turbine generators by a central control system on the basis of the rotational speed of the rotor measured.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: May 6, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Masayuki Hashimoto, Hisanobu Shinoda, Tsuyoshi Wakasa, Akira Yasugi, Takumi Nakashima
  • Patent number: 8692399
    Abstract: A wind energy plant and method for operating it, the plant having a doubly-fed asynchronous machine, a grid-sided converter and a generator-sided converter both being controlled by a control means. In case of a grid fault the converters are controlled by at least one control module which (i) controls the torque and/or the active power and (ii) controls the reactive current and/or the reactive power.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: April 8, 2014
    Assignee: Nordex Energy GmbH
    Inventors: Thomas Schubert, Uwe Bellgardt
  • Patent number: 8694171
    Abstract: A wind-turbine control system is provided for each of a plurality of wind turbine generators constituting a wind farm, sends wind-turbine data about a controlled wind turbine generator to the wind-turbine control systems provided for the other wind turbine generators, and receives wind-turbine data about the other wind turbine generators from the wind-turbine control systems provided for the other wind turbine generators. Then, the wind-turbine control system controls the controlled wind turbine generator based on the wind-turbine data about the controlled wind turbine generator and the wind-turbine data about the other wind turbine generators. Therefore, the control of the wind turbine generators constituting the wind farm can be changed more swiftly according to the operational condition of the wind farm.
    Type: Grant
    Filed: February 15, 2011
    Date of Patent: April 8, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Hidekazu Ichinose, Tsuyoshi Wakasa
  • Patent number: 8680701
    Abstract: A circuit for regulating a DC voltage is provided. The circuit includes: a controllable switch system, a resistor, a first control circuit and a second control circuit. The controllable switch system includes a first terminal, a second terminal, a first control terminal, and a second control terminal. The controllable switch system is configured to establish an electrical connection between the first terminal and the second terminal, if a first control signal applied to the first control terminal satisfies a first criterion or if a second control signal applied to the second control terminal satisfies a second criterion; A method for regulating a DC voltage and an AC-to-AC-converter are described.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: March 25, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventor: Rodney Jones
  • Publication number: 20130301166
    Abstract: Method for protecting an electrical energy distribution box, the electrical energy distribution box comprising a set of distribution bars intended to be connected between a generator and loads, each of the bars being able to transfer at least a part of the electrical energy passing through it to at least one other bar of the set of bars. According to this method, the incoming and outgoing currents of a single distribution bar are measured and a fault in the set of bars is detected on the basis of the currents measured in the said bar.
    Type: Application
    Filed: April 10, 2013
    Publication date: November 14, 2013
    Inventor: Jérôme Jean-Louis Comeil Valire
  • Publication number: 20130286513
    Abstract: A system and method for subtransient current suppression in a power system. A generator is configured to provide an output current to a power distribution system. A current sensor is configured to sense the output current. A switch is configured to direct the output current to ground when the switch is closed. A controller is configured to close the switch for a time delay in response to identifying a level of the output current that is greater than a threshold level and to automatically open the switch in response to identifying an end of the time delay.
    Type: Application
    Filed: April 26, 2012
    Publication date: October 31, 2013
    Applicant: THE BOEING COMPANY
    Inventors: Robert D. Holley, Thomas F. Currier, Eugene Solodovnik, Farhad Nozari
  • Patent number: 8564914
    Abstract: An electrical power protection system, includes a generator configured for supplying Direct Current (DC) power to a load bus, the load bus in electrical communication with a bus circuit; a generator control unit being configured for regulating the output voltage supplied by the generator; a bus contactor in serial communication with the bus circuit, the bus contactor including logic circuits configured for detecting an overcurrent in the bus circuit, the overcurrent representative of a ground fault in the bus circuit; and a capacitor bank coupled to the generator for selectively supplying an excitation voltage through a diode switch to the generator during the ground fault in the bus circuit.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: October 22, 2013
    Assignee: Sikorsky Aircraft Corporation
    Inventors: Mark P. Eisenhauer, Christopher Patrick Sullivan
  • Publication number: 20130271878
    Abstract: A method and system for responding to a fast trip protective element trip in a generator system that re-excites the generator when a fast trip protection element trips and determines whether the generator immediately retrips the fast trip protection element, thereby determining whether a fault is located in the generator or in an attached load. If it is determined that the fault is located in the load, the system re-excites and reconnects the load after disabling the fast trip protection element for a specified period to allow for the load to clear its fault.
    Type: Application
    Filed: April 15, 2012
    Publication date: October 17, 2013
    Inventors: Vijay K. Maddali, Jeffrey D. Myroth, Jef William Good, Shane R. Traser
  • Publication number: 20130271877
    Abstract: An overcurrent fault protection method includes detecting an overcurrent fault in a variable frequency electric power generation system having a first main generator connected to a first alternating current bus through a first generator line contactor, a second main generator connected to a second alternating current bus through a second generator line contactor and an auxiliary power generator connected to a plurality of bus tie contactors, through a third generator line contactor, and connected to at least one of the first and second alternating current buses through the plurality of bus tie contactors, in response to detecting the overcurrent fault, locking out one or more of the plurality of bus tie contactors and in response to a continued detection of the overcurrent fault, opening at least one of the first second and third generator line contactors.
    Type: Application
    Filed: April 12, 2012
    Publication date: October 17, 2013
    Applicant: Hamilton Sundstrand Corporation
    Inventors: Nebojsa (Neno) Novakovic, Jef William Good
  • Publication number: 20130271879
    Abstract: A fault protection system of a power system of a dynamically positioned vessel is provided. The power system has a power distribution bus having three or more bus subsections, electric connections including bus ties which connect the bus subsections in a ring configuration, and circuit breakers connected between the bus subsections. The fault protection system includes a generator circuit breaker for coupling a generator to a bus subsection, feeder circuit breaker(s) for coupling load(s) to the bus subsection, a first circuit breaker for connecting one end of the bus subsection to a bus tie that provides an electric connection to another bus subsection, the first circuit breaker being a bus tie breaker, a second circuit breaker for coupling another end of the bus subsection to a further bus subsection, protection relays for operating the circuit breakers, and communication links between protection relays that exchange information via said communication links.
    Type: Application
    Filed: April 17, 2013
    Publication date: October 17, 2013
    Applicant: Siemens Aktiengesellschaft
    Inventors: Rune B. Andersen, Svein Blystad, Inge Haukaas, Gunnar Koenig, Damir Radan, Stig Olav Settemsdal
  • Patent number: 8547668
    Abstract: 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.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: October 1, 2013
    Assignee: Cummins Power Generation IP, Inc.
    Inventor: Paul R. Dahlen
  • Publication number: 20130194704
    Abstract: An assembly includes an electrical machine connected to a power converter by a three-phase circuit having three conductors, e.g. cables. Each conductor is associated with a switching device such as a contactor or the like that connects the conductor to a common conductor or terminal. In the event of a fault current being developed in the circuit or the power converter, the switching devices are operated to close the fault current and connect together the conductors or the three-phase circuit to provide a full three-phase short circuit.
    Type: Application
    Filed: March 14, 2011
    Publication date: August 1, 2013
    Applicant: GE ENERGY POWER CONVERSION TECHNOLOGY LTD. (formerly Converteam Technology Ltd.)
    Inventor: Eric Anthony Lewis
  • Patent number: 8477463
    Abstract: A method, system, and apparatus of a vibration based user input for mobile devices are disclosed. In one embodiment, a method of controlling an electronic device includes receiving an impact signal, (e.g., a vibration generated by a user controlled impact with a surface mechanically coupled to a housing of the electronic device). The method further includes identifying a user command to the electronic device based on the impact signal, and performing a predesignated action (e.g., a mute, a power on, a power off, a volume increase, a volume decrease, a music track change, a call redirect, a call directed to voicemail, etc.) based on the user command. The user command may be identified using a number of user controlled impacts and an interval between a prior user controlled impact and a later user controlled impact.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: July 2, 2013
    Assignee: LSI Corporation
    Inventor: Ajith Ms
  • Patent number: 8441264
    Abstract: A detecting station of a winding product and a method for detecting an inter-turn short circuit are provided. The method includes following steps. First, a high voltage pulse is input to two ends of a winding of a winding product. Next, a voltage value of an electrifying process of the winding is extracted for generating an extracting data. Finally, a time-frequency converting operation is performed to the extracting data, and a time-frequency analysis information is generated for indicating whether or not the inter-turn short circuit is occurred in the winding.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: May 14, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Chun-Chieh Wang, Yu-Liang Chung, Yong-Lin Kuo, Lai-Sheng Chen
  • Patent number: 8427010
    Abstract: A system, in one embodiment, includes a photovoltaic power converter. The photovoltaic power converter includes one or more photovoltaic arrays configured convert solar energy into a DC signal and two or more N-level converters coupled to a common DC bus (N being an integer greater than 2).
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: April 23, 2013
    Assignee: General Electric Company
    Inventors: Sumit Bose, Ralph Teichmann, Kathleen Ann O'Brien
  • Publication number: 20130057227
    Abstract: An apparatus and method of controlling an electrical generating apparatus is provided. The apparatus includes an electrical generator configured to be connected to an electrical grid and a converter comprising an inverter connected to a rotor of the electrical generator. The apparatus also includes a shunt protection circuit connected to the inverter and the rotor of the electrical generator and a control unit configured to activate and deactivate the inverter and the shunt protection circuit. The control unit is configured to, in response to determining that an abnormal condition is occurring in the electrical generator or an electrical grid to which the electrical generator is connected, deactivate the inverter and activate the shunt protection circuit. Also, after it is determined that the abnormal condition has passed, the control unit is configured to activate the inverter before deactivating the shunt protection circuit.
    Type: Application
    Filed: January 12, 2012
    Publication date: March 7, 2013
    Applicant: INGETEAM TECHNOLOGY, S.A.
    Inventors: Sergio AURTENETXEA, Eneko OLEA, Iker GARMENDIA, Ainhoa CARCAR