Patents by Inventor Haiqing Weng
Haiqing Weng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9190923Abstract: A system for power conversion includes a power converter having switching elements, a detector, and a controller is provided. The detector detects a parameter and provides electrical signals indicative of the parameter. The controller receives the electrical signals transmitted from the detector, and sends commands to instruct the power converter to perform power conversion by operating the switching elements in accordance with switching signals at a different frequency in response to a detection of the system condition. A method for operating the system is also provided.Type: GrantFiled: May 30, 2012Date of Patent: November 17, 2015Assignee: General Electric CompanyInventors: Xiaoming Yuan, Haiqing Weng, Zhuohui Tan, Yunfeng Liu, Wenqiang Yang, Pengcheng Zhu
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Patent number: 8547715Abstract: A converter system comprises a DC to AC converter, a maximum power point tracking device, and an array-side control. The DC link converts DC from a photovoltaic array to AC for a grid. The maximum power point tracking device is coupled to the array. The array-side control, which is coupled to the DC to AC converter and the device, prevents overvoltage in the DC bus of the DC to AC converter using array voltage and current data from the device and DC bus voltage data from the DC to AC converter during a grid transient by adjusting a maximum power point of the array to increase array voltage.Type: GrantFiled: September 15, 2010Date of Patent: October 1, 2013Assignee: General Electric CompanyInventors: Xiaoming Yuan, Zhuohui Tan, Haiqing Weng
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Publication number: 20130134710Abstract: A system for power conversion includes a power converter having switching elements, a detector, and a controller is provided. The detector detects a parameter and provides electrical signals indicative of the parameter. The controller receives the electrical signals transmitted from the detector, and sends commands to instruct the power converter to perform power conversion by operating the switching elements in accordance with switching signals at a different frequency in response to a detection of the system condition. A method for operating the system is also provided.Type: ApplicationFiled: May 30, 2012Publication date: May 30, 2013Inventors: Xiaoming Yuan, Haiqing Weng, Zhuohui Tan, Yunfeng Liu, Wenqiang Yang, Pengcheng Zhu
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Patent number: 8014181Abstract: A power distribution system comprises a power conversion module for performing power conversion between a DC voltage at a DC side and an AC power at an AC side, and a conversion control system. The AC side of the power conversion module is electrically coupled to a grid. The conversion control system includes a phase-locked-loop circuit for receiving a multi-phase reference signal of a grid voltage and for generating a synchronized signal, a regulator for receiving reference commands, a two-phase grid feedback signal, and the synchronized signal and for generating a control signal for the power conversion module, and a phase compensation circuit for receiving the synchronized signal and the multi-phase reference signal of the grid voltage, for obtaining a phase displacement signal, and for generating a phase compensation signal for compensating the reference commands or for compensating the synchronized signal when the phase displacement signal exceeds a threshold value.Type: GrantFiled: September 29, 2009Date of Patent: September 6, 2011Assignee: General Electric CompanyInventors: Zhuohui Tan, Robert William Delmerico, Xiaoming Yuan, Haiqing Weng
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Publication number: 20110128760Abstract: A converter system comprises a DC to AC converter, a maximum power point tracking device, and an array-side control. The DC link converts DC from a photovoltaic array to AC for a grid. The maximum power point tracking device is coupled to the array. The array-side control, which is coupled to the DC to AC converter and the device, prevents overvoltage in the DC bus of the DC to AC converter using array voltage and current data from the device and DC bus voltage data from the DC to AC converter during a grid transient by adjusting a maximum power point of the array to increase array voltage.Type: ApplicationFiled: September 15, 2010Publication date: June 2, 2011Inventors: Xiaoming YUAN, Zhuohui TAN, Haiqing WENG
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Patent number: 7940131Abstract: An apparatus for rapidly tracking fundamental frequency information in the signal of an electric grid is a cross-coupled phase-lock loop filter (CCPLL) that includes the use of a phase-lock-loop (PLL) apparatus having a plurality individual filters, wherein an input for a first filter in the plurality of individual filters comprises the signal of the electric grid and an output signal from at least a second filter in the plurality of individual filters. A method for using the CCPLL includes applying a signal to the CCPLL and monitoring the output of the CCPLL. Use of the CCPLL may be accomplished or modeled via computer instructions stored on machine readable media.Type: GrantFiled: August 22, 2008Date of Patent: May 10, 2011Assignee: General Electric CompanyInventors: Haiqing Weng, John D. D'Atre, Robert A. Seymour, Allen M. Ritter, Xiaoming Yuan, Renchang Dai, Robert W. Delmerico
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Patent number: 7928780Abstract: A phase-locked loop circuit comprises a phase error detector for receiving a multi-phase reference signal and a synchronized phase signal of the phase-locked-loop circuit, and for performing a rotational transformation to convert the multi-phase reference signal into two-phase quantities at a synchronous rotation d-q reference frame. A monotonic transfer module receives the two-phase quantities, and generates a monotonic phase error signal which is monotonic when a phase difference between the multi-phase reference signal and the synchronized phase signal ranges from ?180 degrees to 180 degrees. A regulator receives the monotonic phase error signal, and generates a synchronized rotation frequency. An integrator receives the synchronized rotation frequency, and generates the synchronized phase signal.Type: GrantFiled: September 29, 2009Date of Patent: April 19, 2011Assignee: General Electric CompanyInventors: Xiaoming Yuan, Zhuohui Tan, Robert William Delmerico, Haiqing Weng, Robert Allen Seymour
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Publication number: 20110074474Abstract: A phase-locked loop circuit comprises a phase error detector for receiving a multi-phase reference signal and a synchronized phase signal of the phase-locked-loop circuit, and for performing a rotational transformation to convert the multi-phase reference signal into two-phase quantities at a synchronous rotation d-q reference frame. A monotonic transfer module receives the two-phase quantities, and generates a monotonic phase error signal which is monotonic when a phase difference between the multi-phase reference signal and the synchronized phase signal ranges from ?180 degrees to 180 degrees. A regulator receives the monotonic phase error signal, and generates a synchronized rotation frequency. An integrator receives the synchronized rotation frequency, and generates the synchronized phase signal.Type: ApplicationFiled: September 29, 2009Publication date: March 31, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Xiaoming Yuan, Zhuohui Tan, Robert William Delmerico, Haiqing Weng, Robert Allen Seymour
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Publication number: 20110075456Abstract: A power distribution system comprises a power conversion module for performing power conversion between a DC voltage at a DC side and an AC power at an AC side, and a conversion control system. The AC side of the power conversion module is electrically coupled to a grid. The conversion control system includes a phase-locked-loop circuit for receiving a multi-phase reference signal of a grid voltage and for generating a synchronized signal, a regulator for receiving reference commands, a two-phase grid feedback signal, and the synchronized signal and for generating a control signal for the power conversion module, and a phase compensation circuit for receiving the synchronized signal and the multi-phase reference signal of the grid voltage, for obtaining a phase displacement signal, and for generating a phase compensation signal for compensating the reference commands or for compensating the synchronized signal when the phase displacement signal exceeds a threshold value.Type: ApplicationFiled: September 29, 2009Publication date: March 31, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Zhuohui Tan, Robert William Delmerico, Xiaoming Yuan, Haiqing Weng
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Patent number: 7852643Abstract: A system and method for controlling cross current in an interleaved power converter system having a plurality of converter threads coupled in parallel includes collecting a feedback current from each thread and obtaining a normal current and a differential mode current for each thread, based on its respective feedback current. The normal current of each thread is regulated to a commanded thread normal current value via a respective normal current control loop based on d-q rotating frame parameters. A differential mode cross current of each thread is regulated to zero via a respective differential mode cross current control loop based on d-q rotating frame parameters; while a differential mode cross current DC offset of each thread is regulated to zero via a respective differential mode cross current control loop based on stationary frame parameters.Type: GrantFiled: June 27, 2007Date of Patent: December 14, 2010Assignee: General Electric CompanyInventors: Richard S. Zhang, Changyong Wang, Zhuohui Tan, Haiqing Weng
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Patent number: 7804184Abstract: A system for controlling a grid connected power generating system is provided. The system includes a wind turbine, a converter, a first controller and a second controller. The wind turbine supplies electrical power to a power grid and the converter couples the wind turbine to the power grid. The first controller calculates voltage commands to emulate a phasor back electromotive force behind an inductance. The controller further generates converter switching commands from the voltage commands. The voltage commands include a voltage magnitude reference and an internal frequency reference calculated from a power imbalance between an active power reference and the electrical power. The second controller is used to limit a converter current.Type: GrantFiled: January 23, 2009Date of Patent: September 28, 2010Assignee: General Electric CompanyInventors: Xiaoming Yuan, Allen Michael Ritter, Haiqing Weng, Robert William Delmerico
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Patent number: 7745949Abstract: A method of assembling an electrical machine includes programming at least one processor with a stator flux vector estimation scheme. The electrical machine has a stator at least partially extending around a rotor. The electrical machine is electrically coupled to an electric power system. The electric power system transmits at least one phase of electric power to and from the electrical machine with at least partial power conversion. The stator flux vector estimation scheme is programmed to generate at least one stator back-electromagnetic force (back-EMF) signal and to generate at least one stator flux vector signal using the at least one stator back-EMF signal. The at least one stator flux vector signal at least partially represents an estimated rotor position. The method also includes coupling at least one output device in data communication with the at least one processor.Type: GrantFiled: February 26, 2008Date of Patent: June 29, 2010Assignee: General Electric CompanyInventors: Wenqiang Yang, Zhigang Lu, Anthony Michael Klodowski, Ralph Teichmann, Changyong Wang, Haiqing Weng, Xiaoming Yuan
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Publication number: 20100142237Abstract: A system for controlling a grid connected power generating system is provided. The system includes a wind turbine, a converter, a first controller and a second controller. The wind turbine supplies electrical power to a power grid and the converter couples the wind turbine to the power grid. The first controller calculates voltage commands to emulate a phasor back electromotive force behind an inductance. The controller further generates converter switching commands from the voltage commands. The voltage commands include a voltage magnitude reference and an internal frequency reference calculated from a power imbalance between an active power reference and the electrical power. The second controller is used to limit a converter current.Type: ApplicationFiled: January 23, 2009Publication date: June 10, 2010Applicant: GENERAL ELECTRIC COMPANYInventors: Xiaoming Yuan, Allen Michael Ritter, Haiqing Weng, Robert William Delmerico
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Publication number: 20090212564Abstract: A method of assembling an electrical machine includes programming at least one processor with a stator flux vector estimation scheme. The electrical machine has a stator at least partially extending around a rotor. The electrical machine is electrically coupled to an electric power system. The electric power system transmits at least one phase of electric power to and from the electrical machine with at least partial power conversion. The stator flux vector estimation scheme is programmed to generate at least one stator back-electromagnetic force (back-EMF) signal and to generate at least one stator flux vector signal using the at least one stator back-EMF signal. The at least one stator flux vector signal at least partially represents an estimated rotor position. The method also includes coupling at least one output device in data communication with the at least one processor.Type: ApplicationFiled: February 26, 2008Publication date: August 27, 2009Inventors: Wenqiang Yang, Zhigang Lu, Anthony Michael Klodowski, Ralph Teichmann, Changyong Wang, Haiqing Weng, Xiaoming Yuan
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Patent number: 7532490Abstract: A power converter for coupling an electrical machine to an electrical grid includes a machine side converter and a grid side converter, each, side having a plurality of corresponding stages for converting a three-phase electrical signal of the electrical machine to a three-phase electrical signal of the electrical grid. The machine side converter includes a plurality of single-phase bridges coupled in series. The grid side converter includes a plurality of three-phase bridges. Each three-phase bridge corresponds to one of the single-phase bridges of the machine side converter. Each three-phase bridge is coupled to the primary windings of a corresponding transformer. The secondary windings of each corresponding transformer is phase-shifted from its primary windings and is coupled to secondary windings of another respective transformer, thus providing for coupling of the three-phase bridges in a series.Type: GrantFiled: August 14, 2006Date of Patent: May 12, 2009Assignee: General Electric CompanyInventors: Rajib Datta, Haiqing Weng, Richard S. Zhang, Ravisekhar Raju, Allen M. Ritter
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Publication number: 20090045782Abstract: A power conversion system includes two three-level converters, and a phase shifted transformer coupled to the converters.Type: ApplicationFiled: August 16, 2007Publication date: February 19, 2009Applicant: GENERAL ELECTRIC COMPANYInventors: Rajib Datta, Allen Michael Ritter, Haiqing Weng, Luis Jose Garces, Kunlun Chen, Haitao Zhang
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Publication number: 20090015339Abstract: An apparatus for rapidly tracking fundamental frequency information in the signal of an electric grid is a cross-coupled phase-lock loop filter (CCPLL) that includes the use of a phase-lock-loop (PLL) apparatus having a plurality individual filters, wherein an input for a first filter in the plurality of individual filters comprises the signal of the electric grid and an output signal from at least a second filter in the plurality of individual filters. A method for using the CCPLL includes applying a signal to the CCPLL and monitoring the output of the CCPLL. Use of the CCPLL may be accomplished or modeled via computer instructions stored on machine readable media.Type: ApplicationFiled: August 22, 2008Publication date: January 15, 2009Applicant: General Electric CompanyInventors: Haiqing Weng, John D. D'Atre, Robert A. Seymour, Allen M. Ritter, Xiaoming Yuan, Renchang Dai, Robert W. Delmerico
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Publication number: 20090003020Abstract: A system and method for controlling cross current in an interleaved power converter system having a plurality of converter threads coupled in parallel includes collecting a feedback current from each thread and obtaining a normal current and a differential mode current for each thread, based on its respective feedback current. The normal current of each thread is regulated to a commanded thread normal current value via a respective normal current control loop based on d-q rotating frame parameters. A differential mode cross current of each thread is regulated to zero via a respective differential mode cross current control loop based on d-q rotating frame parameters; while a differential mode cross current DC offset of each thread is regulated to zero via a respective differential mode cross current control loop based on stationary frame parameters.Type: ApplicationFiled: June 27, 2007Publication date: January 1, 2009Inventors: Richard S. Zhang, Changyong Wang, Zhuohui Tan, Haiqing Weng
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Patent number: 7456695Abstract: An apparatus for rapidly tracking fundamental frequency information in the signal of an electric grid is a cross-coupled phase-lock loop filter (CCPLL) that includes the use of a phase-lock-loop (PLL) apparatus having a plurality individual filters, wherein an input for a first filter in the plurality of individual filters comprises the signal of the electric grid and an output signal from at least a second filter in the plurality of individual filters. A method for using the CCPLL includes applying a signal to the CCPLL and monitoring the output of the CCPLL. Use of the CCPLL may be accomplished or modeled via computer instructions stored on machine readable media.Type: GrantFiled: January 10, 2006Date of Patent: November 25, 2008Assignee: General Electric CompanyInventors: Haiqing Weng, John D. D'Atre, Robert A. Seymour, Allen M. Ritter, Xiaoming Yuan, Renchang Dai, Robert W. Delmerico
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Patent number: 7423412Abstract: Method and apparatus that provide a response to the negative sequence current demands during a disturbance of the grid system connected to power-generating equipment, such as a wind turbine system, provide for tracking components in the grid signal, orienting at least a portion of the signal, and injecting the oriented portion. Controlled injection of negative sequence current provides for extending small-signal control response, and also provides for modifications of the apparent impedance to the grid interconnect of the power conversion equipment.Type: GrantFiled: January 31, 2006Date of Patent: September 9, 2008Assignee: General Electric CompanyInventors: Haiqing Weng, Robert A. Seymour, John D. D'Atre, Allen M. Ritter, Xiaoming Yuan, Renchang Dai, Robert W. Delmerico