Patents by Inventor Zhuohui Tan
Zhuohui Tan 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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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: 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: 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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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: 20110018281Abstract: A system for controlling torque ripple in a permanent magnet synchronous machine includes a power converter configured to be coupled to the permanent magnet synchronous machine and to receive converter control signals and a system controller coupled to the power converter. The system controller includes a fundamental current controller configured for providing fundamental voltage commands, a harmonic current controller configured for using harmonic current commands, current feedback signals from the permanent magnet machine, and fundamental current commands in combination with positive and negative sequence regulators to obtain harmonic voltage commands, and summation elements configured for adding the fundamental voltage commands and the harmonic voltage commands to obtain the converter control signals.Type: ApplicationFiled: October 7, 2010Publication date: January 27, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Zhuohui Tan, Xiaoming Yuan, Changyong Wang, Ronghai Qu, Robert William Delmerico, Patrick Lee Jansen
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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: 7847526Abstract: A system for controlling torque ripple in a permanent magnet synchronous machine includes a power converter configured to be coupled to the permanent magnet synchronous machine and to receive converter control signals and a system controller coupled to the power converter. The system controller includes a fundamental current controller configured for providing fundamental voltage commands, a harmonic current controller configured for using harmonic current commands, current feedback signals from the permanent magnet machine, and fundamental current commands in combination with positive and negative sequence regulators to obtain harmonic voltage commands, and summation elements configured for adding the fundamental voltage commands and the harmonic voltage commands to obtain the converter control signals.Type: GrantFiled: September 28, 2007Date of Patent: December 7, 2010Assignee: General Electric CompanyInventors: Zhuohui Tan, Xiaoming Yuan, Changyong Wang, Ronghai Qu, Robert William Delmerico, Patrick Lee Jansen
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Publication number: 20100156192Abstract: A power generation system comprises at least two electrical systems connected at an electrical connection point. Each electrical system comprises a power conversion system comprising a converter including a plurality of switches for converting direct current power into alternating current power. The power generation system comprises a control system including at least two pulse width modulation (PWM) modulators, each PWM modulator for obtaining a fundamental waveform and a carrier signal, using the fundamental and carrier signals to generate a PWM pattern, and for providing the PWM pattern to a respective converter for driving the switches of the respective converter. The control system is configured to interleave carrier signals, fundamental waveforms, or a combination of carrier signals and fundamental waveforms of the at least two electrical systems to generate interleaved PWM patterns respectively for the at least two converters.Type: ApplicationFiled: December 22, 2008Publication date: June 24, 2010Applicant: GENERAL ELECTRIC COMPANYInventors: Changyong Wang, Zhuohui Tan, Robert William Delmerico, Allen Michael Ritter, Ralph Teichmann, Richard S. Zhang, Robert Allen Seymour, Xiaoming Yuan
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Patent number: 7573732Abstract: A protective circuit for a multi-level converter including a DC link capacitor bank includes: an energy absorbing element; switches, wherein at least two of the switches each couple the energy absorbing element to the capacitor bank; and a controller configured to provide control signals to the switches to selectively actuate the switches to enable control of energy dissipation and to enable control of voltage balance on the capacitor bank of the multi-level converter.Type: GrantFiled: May 25, 2007Date of Patent: August 11, 2009Assignee: General Electric CompanyInventors: Ralph Teichmann, Changyong Wang, Robert William Delmerico, Zhuohui Tan, Robert Roesner, Renchang Dai
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Publication number: 20090085354Abstract: A system for controlling torque ripple in a permanent magnet synchronous machine includes a power converter configured to be coupled to the permanent magnet synchronous machine and to receive converter control signals and a system controller coupled to the power converter. The system controller includes a fundamental current controller configured for providing fundamental voltage commands, a harmonic current controller configured for using harmonic current commands, current feedback signals from the permanent magnet machine, and fundamental current commands in combination with positive and negative sequence regulators to obtain harmonic voltage commands, and summation elements configured for adding the fundamental voltage commands and the harmonic voltage commands to obtain the converter control signals.Type: ApplicationFiled: September 28, 2007Publication date: April 2, 2009Applicant: GENERAL ELECTRIC COMPANYInventors: Zhuohui Tan, Xiaoming Yuan, Changyong Wang, Ronghai Qu, Robert William Delmerico, Patrick Lee Jansen
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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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Publication number: 20080291708Abstract: A protective circuit for a multi-level converter including a DC link capacitor bank includes: an energy absorbing element; switches, wherein at least two of the switches each couple the energy absorbing element to the capacitor bank; and a controller configured to provide control signals to the switches to selectively actuate the switches to enable control of energy dissipation and to enable control of voltage balance on the capacitor bank of the multi-level converter.Type: ApplicationFiled: May 25, 2007Publication date: November 27, 2008Applicant: GENERAL ELECTRIC COMPANYInventors: Ralph Teichmann, Changyong Wang, Robert William Delmerico, Zhuohui Tan, Robert Roesner, Renchang Dai
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Patent number: 7446435Abstract: A power system for providing an output power to a load is provided. The system comprises a generator configured to generate an alternating current input power and an power converter system coupled to the generator and configured to generate an output power and provide the output power to the load through at least one transformer. The system further comprises a converter control system coupled to the converter system and configured to drive the converter system in an interleaved pattern to reduce harmonic components in the output power and the alternating current input power.Type: GrantFiled: November 30, 2005Date of Patent: November 4, 2008Assignee: General Electric CompanyInventors: Richard S. Zhang, Changyong Wang, Lei Li, James Patrick Lyons, Zhuohui Tan, Allen Michael Ritter
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Publication number: 20070121353Abstract: A power system for providing an output power to a load is provided. The system comprises a generator configured to generate an alternating current input power and an power converter system coupled to the generator and configured to generate an output power and provide the output power to the load through at least one transformer. The system further comprises a converter control system coupled to the converter system and configured to drive the converter system in an interleaved pattern to reduce harmonic components in the output power and the alternating current input power.Type: ApplicationFiled: November 30, 2005Publication date: May 31, 2007Inventors: Richard Zhang, Changyong Wang, Lei Li, James Lyons, Zhuohui Tan, Allen Ritter