Stabilized, Anti-hunting Or Antioscillation Systems Patents (Class 307/102)
  • Patent number: 10189483
    Abstract: An apparatus, system, and method for controlling functions of a vehicular alarm. The method includes receiving one or more signals including location information, determining a location of the vehicle using the location information, setting one or more functions based on the location information, determining whether an alarm function is activated, and activating the one or more functions according to the setting upon determining that an alarm has been activated. The method may further include using GPS data or signals transmitted from one or more base stations (e.g., from cellular telephone base stations, computer networks, proprietary transmitters, etc.) to determine the position of the apparatus (e.g., installed in the vehicle). The apparatus may also inform a user of regulations relating to an area dependent upon its location.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: January 29, 2019
    Inventor: Victor A. Grossman
  • Patent number: 10084315
    Abstract: A power conversion circuit for converting DC power supplied from a DC power supply to AC power; and a power conversion control section for controlling operation of the power conversion circuit so as to generate autonomous operation power as an AC voltage source in a parallel-off state from a power grid. The power conversion control section includes: an AC voltage control section for controlling AC voltage; an AC current suppression section for limiting AC current to a predetermined current limit value or smaller; and a DC voltage shortage suppression section for, when DC voltage of the power conversion circuit reduces, in response thereto, reducing the current limit value to be given to the AC current suppression section.
    Type: Grant
    Filed: July 4, 2014
    Date of Patent: September 25, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Okuda, Kikuo Izumi, Takahiro Kato
  • Patent number: 10083789
    Abstract: An apparatus for reducing a magnetic unidirectional flux component in the core of a transformer, i.e., a three-phase transformer, includes a plurality of compensation windings that are magnetically coupled to the core of the transformer, wherein a controllable current source for feeding current into the compensation windings is arranged electrically in series with the compensation windings, specifically with the neutral point thereof, which is forming by the inputs of the compensation windings, and a neutral earthing transformer is electrically connected to the outputs of the compensation windings, where the current source electrically interconnects the neutral point of the compensation windings and the neutral point of the neutral earthing transformer.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: September 25, 2018
    Assignee: Siemens Aktiengesellschaft
    Inventor: Peter Hamberger
  • Patent number: 10049842
    Abstract: Provided is a relay unit that can sufficiently suppress defects that are caused by an insulation failure of insulating member that insulates and separates a load power supply from a device power supply, and a method for controlling a relay circuit. A control unit includes an insulating member diagnosis unit that performs diagnosis of an insulation failure of the capacitor.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: August 14, 2018
    Assignee: OMRON Corporation
    Inventors: Tetsuya Fukumoto, Toshiyuki Higuchi, Kohei Murakami, Satoshi Fujii
  • Patent number: 10014685
    Abstract: In a method for controlling the state of charge (SOC) of a battery power plant (1), which for controlling at least one physical quantity (P, f) is connected to an electric energy distribution network (2), the state of charge (SOC) of the battery power plant (1) is detected for at least one physical quantity (P, f) of the energy distribution network (2) with a detection speed and/or detection accuracy which are greater than specified limit values for a minimum detection speed and detection accuracy of the physical quantity (P, f), and the electric power transfer between the battery power plant (1) and the energy distribution network (2) is determined by taking account of the difference between the actual and the specified control speed and control accuracy of the physical quantity (P, f) to be controlled as well as a difference between the actual and the specified height and rate of change of the power transfer between the battery power plant (1) and the energy distribution network (2).
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: July 3, 2018
    Assignee: YOUNICOS AG
    Inventors: Clemens Triebel, Carsten Reincke-Collon, Udo Berninger
  • Patent number: 9979196
    Abstract: A parallel generator system wherein a portion of the electrical load of at least one generator unit is incrementally transferred to at least one other generator unit by the controller on the basis of an indication that the operating stresses of the generator units are disallowably unbalanced, whereby load share balancing tending towards equalization of operating stresses amongst the plurality of generator units occurs over the system service life. Also, a method for load share balancing in a parallel generator system which determines whether the operating stress levels of at least two generator units are disallowably unbalanced by comparing operating stress indicators of the generator units with that of a master generator unit, and incrementally transferring portions the electrical load between at least two generator units on the basis of the comparative evaluation, whereby load share balancing occurs tending to equalize the generator unit operating stress levels.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: May 22, 2018
    Assignee: BORGWARNER INC.
    Inventor: Timothy J. Alfermann
  • Patent number: 9972036
    Abstract: A power supply and demand control method for a power storage system includes predicting a consumption power of a customer for each of time slots divided by a specific time interval, assigning one of a frequency control or a peak shaving control to each of the time slots based on the predicted consumption power, controlling the storage battery based on the assigned frequency control or the assigned peak shaving control in each of the time slots, wherein the peak shaving control is assigned to each of the time slots in which the predicted consumption power is higher than a contract power, and the frequency control is assigned to each of the times slot in which the predicted consumption power is equal to or lower than the contract power.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: May 15, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Wei Zhang, Satoshi Tsujimura, Takahiro Sugimoto, Masami Funakura, Tatsuya Mizobata
  • Patent number: 9948221
    Abstract: A method and system for eliminating the low-frequency oscillation between generators. By way of measuring the absolute rotor angle of a generator and controlling the rotor rotational speed, the absolute rotor angles obtained through measurement are the same when each GPS pulse per second signal arrives. The absolute rotor angles are angles of the internal potential Eq of the generator leading a GPS reference vector. Through the absolute rotor angle, zero steady state error control of the frequency and the rotor angle is achieved and the position of the generator rotor can remain unchanged in the PPS determined rotating coordinate system, thus suppressing the low-frequency oscillation better even without the need of remote measurement and achieving automatic local balance of active power during variation of loads. Accordingly, the power fluctuation on transmission lines is decreased while safe and stable operation of a large-scale interconnected power grid is achieved.
    Type: Grant
    Filed: July 10, 2014
    Date of Patent: April 17, 2018
    Inventors: Qiang Wei, Weimin Guo
  • Patent number: 9941795
    Abstract: An average load current calculator circuit configured for determining an average load current within an at least one phase switch mode power converter (SMPC) having at least one peak/valley detector receives an inductor current sense signal and determines and holds a peak or valley amplitude of the inductor current sense signal. A current corrector circuit receives an input voltage and an output voltage of the SMPC and an inductance value of the inductor of the SMPC for determining an average correction current of the peak or valley amplitude of the current sense. An average current generator receives the peak or valley amplitude of the current sense signal and the average correction current for determining the instantaneous average load current within a switch mode power converter (SMPC) by additively combining the peak or valley amplitude of the current sense signal and the average correction current.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: April 10, 2018
    Assignee: Dialog Semiconductor (UK) Limited
    Inventors: John Mayega, Kemal Ozanoglu, Mark Childs, Turan Solmaz
  • Patent number: 9906031
    Abstract: The disclosure is generally directed to reactance modules or DSRs (30) that may be mounted on a power transmission line (16) of a power transmission system (400). A DSR (30) may be configured in a bypass mode or in an injection mode (where reactance is injected into the corresponding line (16)). Multiple DSRs (30) installed on a power line section (18) define an array (410) and have a dedicated controller (440). Such an array (410) and controller (440) may be installed on a number of different power line sections (18). The controller (440) for each array (410) may communicate with a DSR server (420), which in turn may communicate with a utility-side control system (430). Each DSR (30) may incorporate one or more features directed to core (50) configurations and assembly, communications, modal configuration control, fault protection, EMI shielding, DSR (30) assembly, and DSR (30) installation.
    Type: Grant
    Filed: February 25, 2015
    Date of Patent: February 27, 2018
    Assignee: SMART WIRES INC.
    Inventors: Stewart Ramsay, Frances Bell
  • Patent number: 9812985
    Abstract: The present invention relates to a power conditioning unit for delivering power from a dc power source to an ac output, particularly ac voltages greater than 50 volts, either for connecting directly to a grid utility supply, or for powering mains devices independent from the mains utility supply. We describe a power conditioning unit for delivering power from a dc power source to an ac mains output, the power conditioning unit comprising an input for receiving power from said dc power source, an output for delivering ac power, an energy storage capacitor, a dc-to-dc converter having an input connection coupled to said input and an output connection coupled to the energy storage capacitor, and a dc-to-ac converter having an input connection coupled to said energy storage capacitor and an output connection coupled to said output, wherein said energy storage capacitor has a capacitance of less than twenty microfarads.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: November 7, 2017
    Assignee: SOLARCITY CORPORATION
    Inventor: Cuauhtemoc Rodriguez
  • Patent number: 9774189
    Abstract: A method and apparatus for power conversion. In one embodiment, an apparatus includes a power conversion module for converting a first current to a second current, where the first current or the second current is an AC current having at least two phases. The apparatus also includes a waveform modification module, coupled to the power conversion module, for modifying the AC current to generate a modified AC current, where each phase of the modified AC current has a value of zero at the beginning of an AC line cycle.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: September 26, 2017
    Assignee: Enphase Energy, Inc.
    Inventor: Martin Fornage
  • Patent number: 9653920
    Abstract: A method for obtaining a continuous power flow of an electric power system is provided. The method uses the bus having the fastest voltage drop as the local parameterization bus, defines a slope of a line determined by the voltage of the geometric parameterization bus and the load growth factor as the parameterization variable, and adds a one-dimensional geometric parameterization constraint equation near turning points to obtain a nonsingular extended power flow equation, such that the continuation power flow can cross the turning points and a continuous P-V curve can be drawn reliably.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: May 16, 2017
    Assignee: Tsinghua University
    Inventors: Wenchuan Wu, Boming Zhang, Hongbin Sun, Qinglai Guo, Yuntao Ju
  • Patent number: 9599976
    Abstract: This technology relates to systems and methods for effective selection of disparate distributed power sources for smart grid in near real time manner to meet the specific power demand. Power from the plurality of disparate power sources is received and then one or more power sources among the plurality of disparate power sources are selected based on one or more predefined requirements. At least one effective power source is determined from the one or more power sources by applying one or more algorithm based on number and range of the one or more power sources. The one or more algorithm comprise Complete Karmarkar Karp (CKK), pbrute, Heuristic based pbrute. A signal for selection of the at least one effective power source is generated and the signal is sent to a circuit switcher to supply the power from the at least one effective power sources to the smart grid.
    Type: Grant
    Filed: September 23, 2014
    Date of Patent: March 21, 2017
    Assignee: Infosys Limited
    Inventors: Allahbaksh Mohammedali Asadullah, Sunil Kumar Vuppala
  • Patent number: 9590547
    Abstract: A double fed induction generator (DFIG) converter, methods and computer readable mediums are presented in which rotor side current spikes are attenuated by selectively activating at least one series damping circuit to conduct current through a series damping circuit resistance coupled in series between one or more DFIG rotor leads and a grid side converter in response to a grid fault occurrence or a grid fault clearance, and selectively bypassing the series damping circuit resistance after activating the series damping circuit.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: March 7, 2017
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Haihui Lu, Zhenhuan Yuan, Lixiang Wei, Russel J. Kerkman, Richard Lukaszewski, Ahmed Mohamed Sayed Anmed
  • Patent number: 9575482
    Abstract: The present invention relates to an apparatus and method for performing adjustment to optimize the voltage for each distribution network in a power distribution system. The apparatus for adjusting a voltage in the power distribution system adjusts the voltage by switching a switch that lies on a path in the power distribution system. The apparatus determines a switch that is to become a switching target from among switches lying on the path, obtains a voltage optimization value of the determined switching target switch, selects a switch having the minimum voltage optimization value by changing the switching target switch to another switch in order to obtain the voltage optimization value, and adjusts the voltage through switching of the selected switch.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: February 21, 2017
    Assignee: KOREA ELECTRIC POWER CORPORATION
    Inventors: Won Namkoong, Bok-Nam Ha, Sung-Woo Lee, In-Yong Seo, Moon-Jong Jang, Dong-Wan Seo, Sang-Ok Kim
  • Patent number: 9438036
    Abstract: A system having voltage regulator bypass means provides a means for preventing a voltage regulator to be bypassed in a power system when the difference between a load side voltage of the voltage regulator and a source side voltage of the voltage regulator is not below a certain threshold or substantially small. A voltage regulator controller can also prevent the voltage regulator from being bypassed when a tap changer of the voltage regulator is not in a neutral position.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: September 6, 2016
    Assignee: COOPER TECHNOLOGIES COMPANY
    Inventors: Richard John Kaluzny, Daniel Joseph Daley
  • Patent number: 9401665
    Abstract: The disclosure relates to an electric power conversion apparatus, and capable of determining a minimum output voltage of a boost converter based on a voltage of the grid, and comparing the minimum output voltage of the converter with an input voltage of the converter, and controlling the operation of the converter based on the comparison result, thereby reducing the unnecessary operation and switching loss of the converter, the electric power conversion apparatus according to the invention comprises a converter; and a control unit configured to detect a grid voltage to determine a minimum output voltage of the converter based on the grid voltage, and control the operation of the converter based on an input voltage of the converter and the determined minimum output voltage.
    Type: Grant
    Filed: September 15, 2014
    Date of Patent: July 26, 2016
    Assignees: SNU R&DB FOUNDATION, LSIS CO., LTD.
    Inventors: Anno Yoo, Jung Ik Ha, Ho Joon Shin, Kwon Yub Hyung
  • Patent number: 9368968
    Abstract: A control system for an energy storage device is coupled to sensors on an electrical grid. The control system is configured to receive a measurement from each of the sensors. The control system determines, based on the received measurements, whether a grid event is a local event or a distributed event. The control system selects a response mode for controlling the energy storage device based on whether the grid event is determined to be a local event or a distributed event.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: June 14, 2016
    Assignee: YOUNICOS, INC.
    Inventors: Eric Schrock, Richard Thomas Jennings
  • Patent number: 9331014
    Abstract: An improved power distribution network comprises a substrate, an integrated circuit mounted on the substrate, first and second tunable decoupling capacitors mounted on the substrate, and a third decoupling capacitor formed in the integrated circuit. The power supply pin is connected to the first, second, and third capacitors; and the first and second capacitors are connected to the third capacitor as well. The capacitance values of the first and second tunable decoupling capacitors may be adjusted to reduce the magnitude of the system level impedance at least at those frequencies having substantial signal jitter to power noise sensitivity.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: May 3, 2016
    Assignee: Altera Corporation
    Inventors: Hui Liu, Hong Shi
  • Patent number: 9236789
    Abstract: The present disclosure includes programmable snubber circuits and methods. In one embodiment, a circuit is configured between first and second power supply terminals. A programmable snubber circuit may be configured between the first and second power supplies to reduce ringing on the power supplies. In one embodiment, the circuit is a switching regulator and the power supply terminals are internal power supply terminals. The snubber circuit may be programmed to reduce ringing caused by switching currents through parasitic inductances in a package.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: January 12, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Shengyuan Li, Chunlei Shi, Loc Nguyen
  • Publication number: 20150108846
    Abstract: Method and apparatus for mitigating SSR in power transmission system are provided. The method comprises: checking whether the sub-synchronous resonance (SSR) happens in the power transmission system; checking whether the sub-synchronous resonance is undamped; providing a command to bypass the SC unit when the SSR happens and is undamped. In some embodiments, the method further comprises providing a command to reinsert the SC unit into the power transmission system when the transmission level of the power transmission system is determined to be higher than a predetermined level and there is no fault in the power system. The invention also relates to a corresponding apparatus which can implement the method of the invention.
    Type: Application
    Filed: February 1, 2013
    Publication date: April 23, 2015
    Applicant: ABB TECHNOLOGY LTD.
    Inventors: Hailian Xie, Bin Li, Carl Heyman
  • Patent number: 9013067
    Abstract: Method and apparatus for automatic stabilization of an electric power supply network system comprising a network and at least one converter adapted to exchange maximum transferrable power with the network by changing the real current through a stabilizing controller, whereby the necessary direction of current change is determined through real-time stability analysis.
    Type: Grant
    Filed: October 10, 2011
    Date of Patent: April 21, 2015
    Inventor: Walter Kuehn
  • Patent number: 9006933
    Abstract: A method of damping power system oscillations includes obtaining an AC measurement signal from a power system location and determining oscillation frequency values in the AC measurement signal. A plurality of single signal components are extracted from the AC measurement signal by subtracting a plurality of processed measurement signals from the AC measurement signal and a damping signal is generated based on the plurality of single signal components. Each of the plurality of processed measurement signals are generated by time delaying the AC measurement signal with a time delay associated with each of the oscillation frequency values other than the oscillation frequency value of the single signal component to be extracted.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: April 14, 2015
    Assignee: General Electric Company
    Inventors: Swakshar Ray, Amol Rajaram Kolwalkar
  • Patent number: 8929069
    Abstract: An electric vehicle supply equipment may include a first cover element including a well portion to accommodate a first circuitry, wherein the first circuitry includes a chimney stack that couples to a venting hole. Also, the electric vehicle supply equipment may include a second cover element including a recess portion to accommodate a second circuitry, wherein the second circuitry includes a charcoal filter that couples to the chimney stack to absorb impurities generated by the first circuitry and the second circuitry. Further, the electric vehicle supply equipment includes a universal/serial connection port configured to couple to peripheral devices, wherein the universal/serial connection port is an optical coupled connection.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: January 6, 2015
    Assignee: Bosch Automotive Service Solutions LLC
    Inventors: Michael Muller, Charles K. Yankitis, David P. Futkos, Charles E. Phillips, III, Matthew C. Schuping, Jeff Hudnut
  • Patent number: 8907525
    Abstract: A method and system for detecting an islanding condition in a grid is provided. The method comprises detecting a potential islanding condition in a grid; and, in response to the detected potential islanding condition, ramping up an amount of reactive power, active power, or a combination of active and reactive power that is generated from a power conversion system until the earlier of the power conversion system shutting down or a threshold condition being reached.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: December 9, 2014
    Assignee: General Electric Company
    Inventors: Said Farouk Said El-Barbari, Simon Herbert Schramm, Ara Panosyan
  • Publication number: 20140354062
    Abstract: A system for damping power system oscillation includes a damping device controller for generating a damping control signal to compensate for a plurality of oscillation modes in the power system oscillations and a damping device to generate a damping signal based on a damping control signal. The damping device controller includes a plurality of outer closed loop paths each including an adaptive controller configured to determine an individual oscillation mode from at least one power system measurement signal. Each adaptive controller is further configured to generate an adaptive control signal to shift at least one open loop pole of an inner loop path related to the individual oscillation mode to a closed loop location.
    Type: Application
    Filed: May 30, 2013
    Publication date: December 4, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventor: Nilanjan Ray Chaudhuri
  • Patent number: 8872382
    Abstract: A system and a method for compensating harmonic components or a reactive power of an electrical network. The system comprises a measurement unit (1) configured to measure an electrical quantity to be compensated, a control unit (2) configured to determine harmonics contents or a reactive power need of the measured electrical quantity to be compensated as well as to determine, as relative values, desired values corresponding with the harmonics to be compensated or the reactive power to be compensated, one or more compensation units (5, 6) configured, responsive to the desired values provided by the control unit (2), to generate harmonic components or a reactive current according to the desired values given as relative values, and a communications connection (3) configured to communicate the desired values determined by the control unit (2) to the compensation units (5, 6).
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: October 28, 2014
    Assignee: ABB Oy
    Inventors: Antti Tarkiainen, Tero Viitanen
  • Patent number: 8796884
    Abstract: In one embodiment, a power conversion system includes a controller to provide power control to a converter, and a distortion mitigation circuit. In another embodiment, a system includes a converter to transfer power between a power source and a load having fluctuating power demand, and a controller to provide power control, where the controller may selectively disable the power control. In another embodiment, a power conversion system includes a controller to generate a drive signal to provide power control to a power path in response to a sense signal from the power path, where the sense signal is taken from other than the input of the power path, or the drive signal is applied to the power path at other than a first power stage.
    Type: Grant
    Filed: February 10, 2009
    Date of Patent: August 5, 2014
    Assignee: SolarBridge Technologies, Inc.
    Inventors: Ravindranath Naiknaware, Vincenzo DiTommaso, Triet Tu Le, Robert D. Batten, Terri Shreeve Fiez
  • Publication number: 20140183961
    Abstract: A control system for an energy storage device is coupled to sensors on an electrical grid. The control system is configured to receive a measurement from each of the sensors. The control system determines, based on the received measurements, whether a grid event is a local event or a distributed event. The control system selects a response mode for controlling the energy storage device based on whether the grid event is determined to be a local event or a distributed event.
    Type: Application
    Filed: December 28, 2012
    Publication date: July 3, 2014
    Inventors: Eric Schrock, Richard Thomas Jennings
  • Patent number: 8736112
    Abstract: A method for controlling power flow within a multi-terminal DC power transmission system including two or more converter stations and the corresponding multi-terminal DC power transmission system are provided. The method includes the steps of: controlling the power flow to a steady state reference operating point for operating points within a control dead band defined for each respective converter station, and controlling the power flow by means of droop control in at least one of the converter stations upon detection of exceeding of an end point of one or more of the control dead bands.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: May 27, 2014
    Assignee: ABB Technology AG
    Inventors: Kerstin Linden, Gunnar Flisberg, Lars-Erik Juhlin, Per Holmberg
  • Patent number: 8716898
    Abstract: An improved power distribution network comprises a substrate, an integrated circuit mounted on the substrate, a first tunable decoupling capacitor mounted on the substrate, and a second tunable decoupling capacitor formed in the integrated circuit. The power supply pin is connected to both the first and second capacitors by a low frequency path and a DC path, respectively, and the first and second capacitors are connected by a high frequency path.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: May 6, 2014
    Assignee: Altera Corporation
    Inventors: Hui Liu, Hong Shi
  • Patent number: 8710700
    Abstract: A method, device and computer program product for providing improved control of power or voltage oscillation damping in a power transmission system. The device includes a magnitude obtaining element configured to obtain an instantaneous magnitude of a signal representing a deviating oscillation in at least one element of the power transmission system, a slope investigating element configured to determine the rate of change of the signal, and a first processing block including an integrating element configured to integrate the instantaneous magnitudes with an integrating factor that is based on the determined rate of change. The first processing block is further configured to form a phase compensation angle based on the integrated instantaneous magnitude for use in a damping control signal generating unit in order to provide power or voltage oscillation damping of the system.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: April 29, 2014
    Assignee: ABB Research Ltd.
    Inventors: Bertil Berggren, Rajat Majumder, Swakshar Ray, Balarko Chaudhuri, Nilanjan Ray Chaudhuri
  • Patent number: 8686597
    Abstract: A device is configured to inject signals onto a medium made up of conductors and a reference plane. Transformers inject the signals onto the conductors by orthogonal modes. Differential mode chokes each include one input and two outputs. The input is connected to one end of a secondary winding of one of the transformers, or one of the outputs of another one of the chokes. The two outputs are connected to either the inputs of two others of the chokes, the input of another one of the chokes and a conditioner of one of the conductors, or conditioners of two of the conductors. The number of chokes depends on a number of non-differential modes used. The injections that use the chokes are injections selected from between pseudo-differential injections, injection in common mode, or a combination of pseudo-differential injections and injection in common mode.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: April 1, 2014
    Assignee: Marvell Hispania, S.L.U.
    Inventors: Jorge Vicente Blasco Claret, José Luis González Moreno, José María Vidal Ros
  • Patent number: 8659186
    Abstract: A power conversion system is described. The power conversion system includes a first power converter coupled to an electrical grid at a first point of interconnection (POI), a first processing device coupled to the first power converter and configured to control operation of the first power converter, and a first power measurement device coupled to the first processing device and configured to collect data associated with power output of the first power converter. The power conversion system also includes a first global positioning system (GPS) receiver coupled to the first processing device and configured to receive location information corresponding to a location of the first power converter and temporal information corresponding to a time at the location.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: February 25, 2014
    Assignee: General Electric Company
    Inventors: Ralph Teichmann, Kathleen Ann O'Brien, John Freer
  • Patent number: 8618694
    Abstract: System, method, and computer program product for dampening oscillations of the electrical power on a power grid. The system includes a wind park with multiple wind turbines. Each wind turbine includes a rotor, a generator operatively coupled with the rotor for generating electrical power, and an inverter coupling the generator with the power grid to output the electrical power to the power grid. A controller is configured to generate a first control signal to cause the inverter of the first wind turbine to modulate the electrical power output by the first wind turbine for dampening oscillations of one frequency in electrical power on the power grid and to generate a second control signal to cause the inverter of the second wind turbine to modulate the electrical power output by the second wind turbine for dampening oscillations of a different frequency in the electrical power on the power grid.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: December 31, 2013
    Assignee: Vestas Wind Systems A/S
    Inventors: Juan Santiago Santos, Brett D. Rollow, Jason Hoffman
  • Publication number: 20130257166
    Abstract: A method, apparatus and system for suppressing low frequency oscillation in a power system. The method comprises: determining a system transfer function of an interconnected power system section in which a variable frequency transformer (VFT) is located; determining a damping controller parameters according to the system transfer function; and suppressing low frequency oscillation of the power system by means of the VFT based on the damping controller parameter. The objects of the method, apparatus and system are definite: optimizing the damping controller parameter can be achieved by simply tracking and analyzing the response of the system to disturbance, without the need to understand the configuration and parameters of the system or solve complicated power system equations, which has a better effect in suppressing low frequency oscillation in the power system and is advantageous for improving the safety and stability level of the power grid.
    Type: Application
    Filed: October 14, 2011
    Publication date: October 3, 2013
    Applicant: STATE GRID CORPORATION OF CHINA
    Inventors: Gesong Chen, Xiaoxin Zhou, Ruihua Song
  • Publication number: 20130175871
    Abstract: A power oscillation damping controller is provided for a power generation device such as a wind turbine device. The power oscillation damping controller receives an oscillation indicating signal indicative of a power oscillation in an electricity network and provides an oscillation damping control signal in response to the oscillation indicating signal, by processing the oscillation damping control signal in a signal processing chain. The signal processing chain includes a filter configured for passing only signals within a predetermined frequency range.
    Type: Application
    Filed: June 10, 2011
    Publication date: July 11, 2013
    Inventors: Thyge Knüppel, Sathees Kumar, Patrik Thuring
  • Publication number: 20130099582
    Abstract: A method of damping power system oscillations includes obtaining an AC measurement signal from a power system location and determining oscillation frequency values in the AC measurement signal. A plurality of single signal components are extracted from the AC measurement signal by subtracting a plurality of processed measurement signals from the AC measurement signal and a damping signal is generated based on the plurality of single signal components. Each of the plurality of processed measurement signals are generated by time delaying the AC measurement signal with a time delay associated with each of the oscillation frequency values other than the oscillation frequency value of the single signal component to be extracted.
    Type: Application
    Filed: October 21, 2011
    Publication date: April 25, 2013
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Swakshar Ray, Amol Rajaram Kolwalkar
  • Patent number: 8385096
    Abstract: In compensating for unbalanced voltages of three-phase AC, instantaneous values of wye-phase voltages 120° out of phase with each other are obtained from line voltages using a centroid vector operation, symmetrical component voltages of three-phase balanced system are obtained from the instantaneous values of wye-phase voltages, a compensation signal to compensate unbalanced voltages of three-phase AC is generated from zero-phase-sequence voltage of symmetrical component voltages is generated, wye-phase voltages 120° out of phase, the unbalanced voltages of which are compensated, are obtained from the compensation signal and the symmetrical component voltages, a control signal of a PWM conversion is generated based on the compensated wye-phase voltage compensated, and the unbalanced voltages of three-phase AC are compensated. The amount of time to compensate the three-phase unbalanced voltages required for detecting an unbalance of voltages and generating a control signal can be shortened.
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: February 26, 2013
    Assignee: Kyosan Electric Mfg. Co., Ltd.
    Inventors: Itsuo Yuzurihara, Atsushi Takayanagi, Yoshihisa Hata
  • Patent number: 8310095
    Abstract: A power compensator for an electric power transmission line. The power compensator includes a voltage source converter, a capacitor and an energy storage device. The energy storage device includes a high voltage battery having a short circuit failure mode, a first main switch and second main switch for disconnecting the battery from the capacitor, and a control unit for operating the first and second switch.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: November 13, 2012
    Assignee: ABB Research Ltd.
    Inventors: Lennart Ängquist, Magnus Callavik, Willy Hermansson, Stefan Johansson, Gunnar Russberg, Jan R. Svensson
  • Patent number: 8288886
    Abstract: A method for avoiding electrical resonance in a vehicle having a high-voltage (HV) direct current (DC) bus shared by a first and a second power electronic converter device, such as an air conditioning compressor module (ACCM) and a traction power inverter (TPIM), includes determining an impedance characteristic of the bus, defining resonance points for the bus, selecting lower and upper switching frequency boundaries for the TPIM, and preventing the TPIM from operating within a range defined by these boundaries. A vehicle includes the first and second power electronic converter device, e.g., the APPM and the TPIM, the shared HV DC, and a controller having the algorithm set forth above, wherein the controller is adapted for avoiding electrical resonance in the HV DC bus by executing the algorithm.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: October 16, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Mohammad N. Anwar, Steven E. Schulz, Stephan N. Green, James E. Tarchinski
  • Patent number: 8247925
    Abstract: A power source stabilization circuit provided within a chip of an electronic device is provided. The power source stabilization circuit stabilizes a power source voltage supplied to an operational circuit of the electronic device. The power source stabilization circuit includes an amplifier that detects a fluctuation component in the power source voltage occurring in a main power source wiring used to supply the power source voltage to the operational circuit, amplifies the detected fluctuation component, and outputs the amplified fluctuation component, and a stabilization capacitor that is provided between an output end of the amplifier and the main power source wiring and supplies to the main power source wiring a current to reduce fluctuation in the power source voltage occurring in the main power source wiring, in accordance with the output from the amplifier.
    Type: Grant
    Filed: February 4, 2010
    Date of Patent: August 21, 2012
    Assignee: Advantest Corporation
    Inventor: Shoji Kojima
  • Publication number: 20120200166
    Abstract: A method, device and computer program product for providing improved control of power or voltage oscillation damping in a power transmission system. The device includes a magnitude obtaining element configured to obtain an instantaneous magnitude of a signal representing a deviating oscillation in at least one element of the power transmission system, a slope investigating element configured to determine the rate of change of the signal, and a first processing block including an integrating element configured to integrate the instantaneous magnitudes with an integrating factor that is based on the determined rate of change. The first processing block is further configured to form a phase compensation angle based on the integrated instantaneous magnitude for use in a damping control signal generating unit in order to provide power or voltage oscillation damping of the system.
    Type: Application
    Filed: February 6, 2012
    Publication date: August 9, 2012
    Inventors: Bertil Berggren, Rajat Majumder, Swakshar Ray, Balarko Chaudhuri, Nilanjan Ray Chaudhuri
  • Patent number: 8179104
    Abstract: An apparatus (14/18) for controlling a voltage on a transmission line (10). The apparatus (14/18) comprises a first voltage sourced converter controller (18) connected to a first node (22) of the transmission line (10); a second voltage sourced converter controller (14) connected to a second node (20) of the transmission line (10), the second node (20) spaced apart from the first node (22) wherein the first voltage sourced converter controller (18) supplies capacitive reactive current and the second voltage sourced converter controller (14) absorbs inductive reactive current to control the voltage.
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: May 15, 2012
    Assignee: Siemens Energy, Inc.
    Inventor: Abdel-Aty Edris
  • Patent number: 8170723
    Abstract: The present disclosure relates to power system sensitivities as computed from power flow parameters and control parameters of a Power Flow Control Device (PFC). To this end, control parameter variations are applied to or generated by a PFC, and comprise variations in a control input u, a control effort e (injected series voltage, inserted series reactance), or a control effect q (power flow, active power transfer, phase-shift, current). A power flow response measuring unit measures a variation of a power flow response such as current, active or apparent power, in a way sufficiently synchronized with the control parameter variation to allow establishing an unambiguous causal relationship or correspondence in the form of a power system sensitivity.
    Type: Grant
    Filed: April 3, 2009
    Date of Patent: May 1, 2012
    Assignee: ABB Research Ltd.
    Inventors: Bertil Berggren, Mats Larsson, Tord Bengtsson, Petr Korba, Alexandre Oudalov
  • Patent number: 8164221
    Abstract: A control apparatus for a controlled series compensator including a plurality of reactance elements each having a rapid switch for connecting and disconnecting the reactance in series with an electric power transmission line. The apparatus also includes a steady state power flow controller. A damping controller is provides on the presence of an oscillation on the transmission line a first reactance insertion on the transmission line having a first duration of time trigged by a time instant that coincides with a peak in the power oscillation.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: April 24, 2012
    Assignee: ABB Technology Ltd.
    Inventor: Nicklas Johansson
  • Patent number: 8143747
    Abstract: A flux control system for a three-phase active voltage conditioner that utilizes an injection transformer to apply calculated compensation voltage to a mains supply. The flux control system is configured to modify the compensation voltage to be applied to at least one primary terminal of the injection transformer so as to avoid magnetic saturation of the injection transformer. The flux control system includes magnetic flux model modules that are configured to calculate a core flux level of the injection transformer, flux offset modules that are configured to apply a first modification to the compensation voltage to gradually reduce any flux offset in the injection transformer, and peak flux modules that are configured to apply a second modification to the compensation voltage to prevent the core flux level from exceeding a preset range.
    Type: Grant
    Filed: August 20, 2009
    Date of Patent: March 27, 2012
    Assignee: ABB Limited
    Inventor: Simon James Walton
  • Patent number: 8134255
    Abstract: A cancellation signal generation section generates a cancellation signal which cancels an alternating-current component of a power supply terminal voltage of a digital signal processing circuit section, and a synthesis section synthesizes the generated cancellation signal and a power supply voltage of an analog signal processing circuit section to cancel noise superimposed on the power supply voltage.
    Type: Grant
    Filed: December 19, 2007
    Date of Patent: March 13, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Koichi Hatanaka, Kazumi Matsumoto
  • Patent number: 8022575
    Abstract: Exemplary embodiments of the present disclosure provide a method and controller for damping multimode electromagnetic oscillations in electric power systems which interconnect a plurality of generators and consumers. The controller for damping such oscillations includes a phasor measurement unit (PMU) and a power oscillation damper (POD) controller. Each oscillating mode signal is damped and then superposed to derive a control signal. A feedback controller is used to feedback the control signal to a power flow control device in the power system.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: September 20, 2011
    Assignee: ABB Research Ltd
    Inventors: Petr Korba, Mats Larsson