Patents by Inventor Duc Doan
Duc Doan 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: 11894672Abstract: A system for a wind turbine that includes a protection system interfaced to a circuit breaker system and a sensing system. The protection system is configured to determine an operational mode of the wind turbine by monitoring at least two parameters determine a parameter set comprising a plurality of operational parameters based on a determined operational mode, and an associated set of expected values corresponding to the parameter set, determine actual values corresponding to the determined parameter set, identify a fault condition in the event that the determined set of actual values of the operational parameters do not correspond to the determined set of expected values of the operational parameters, and implement a protection action based on the identified fault condition.Type: GrantFiled: July 6, 2021Date of Patent: February 6, 2024Assignee: VESTAS WIND SYSTEMS A/SInventors: Luis Miguel Calhau Gonçalves, Kenneth G. Hansen, Hans Christian Bisgaard-Clausen, Duy Duc Doan, Hamid Soltani, Poul Møhl Dyrlund, Kent Tange
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Patent number: 11728741Abstract: This invention concerns a method of controlling a power converter system 26 operating in an overmodulation region. The power converter system 26 comprises more than two current controllers 71, 73, 77, 79 a modulator 76 and a power converter 78, and the modulator 76 is configured to provide at least one modulated drive signal 87 to the power converter 78 based on voltage reference vector signals 82a, 82b, 82c, 82d from the more than two current controllers 71, 73, 77, 79. The method comprises determining the voltage reference vector signals 82a, 82b, 82c, 82d; determining compensated voltage reference vector signals 84a, 84b, 84c, 84d indicative of a fundamental frequency of a respective voltage reference vector signal 82a, 82b, 82c, 82d; and, determining the at least one modulated drive signal 87 based on a combination of the compensated voltage reference vector signals 84a, 84b, 84c, 84d.Type: GrantFiled: September 19, 2019Date of Patent: August 15, 2023Assignee: VESTAS WIND SYSTEMS A/SInventors: Ciprian Biris, Kent Tange, Duy Duc Doan, Gert Karmisholt Andersen, Torsten Lund, Lars Meyer
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Publication number: 20230231375Abstract: A system for a wind turbine that includes a protection system interfaced to a circuit breaker system and a sensing system. The protection system is configured to determine an operational mode of the wind turbine by monitoring at least two parameters determine a parameter set comprising a plurality of operational parameters based on a determined operational mode, and an associated set of expected values corresponding to the parameter set, determine actual values corresponding to the determined parameter set, identify a fault condition in the event that the determined set of actual values of the operational parameters do not correspond to the determined set of expected values of the operational parameters, and implement a protection action based on the identified fault condition.Type: ApplicationFiled: July 6, 2021Publication date: July 20, 2023Inventors: Luis Miguel CALHAU GONÇALVES, Kenneth G. HANSEN, Hans Christian BISGAARD-CLAUSEN, Duy Duc DOAN, Hamid SOLTANI, Poul Møhl DYRLUND, Kent TANGE
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Patent number: 11611290Abstract: The invention relates to a method for operating a wind turbine which comprises a power generator, a generator side converter, a grid side converter, a DC link electrically connected to an output of the generator side converter and an input of the grid side converter. The method comprises monitoring a wind turbine signal for detection of an operational condition which requires an increase of an output voltage of the grid side converter, upon detection of the operational condition, initiate an over-modulation mode wherein the grid side converter is operated with a modulation index in an over-modulation range, and upon the detection of the operational condition, initiate a DC-voltage adjustment mode wherein the a DC-voltage of the DC link is increased from a first voltage level towards a second voltage level.Type: GrantFiled: December 6, 2018Date of Patent: March 21, 2023Assignee: VESTAS WIND SYSTEMS A/SInventors: Ciprian Biris, Kent Tange, Duy Duc Doan, Torsten Lund, Gert Karmisholt Andersen
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Patent number: 11563385Abstract: This disclosure proposes a topology that integrates a DC chopper into the Modular Multilevel Converter (MMC) cells of a power converter. The integrated DC chopper may include chopper resistors that may also be advantageously integrated into a heat sink for a power module including at least the power transistors of the MMC cell. Embodiments herein also describe a method for using an MMC cell's IGBTs and chopper resistors for providing a safe discharge of both cell capacitors and DC-link capacitors in different operating conditions.Type: GrantFiled: December 27, 2021Date of Patent: January 24, 2023Assignee: VESTAS WIND SYSTEMS A/SInventors: Ciprian Biris, Cem Özgür Gerçek, Lars Helle, Duy Duc Doan, Tune Pedersen
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Patent number: 11502616Abstract: This invention concerns a method of controlling a line side converter of a power converter system operating in an over-modulation range. The line side converter comprises a controller comprising a feedback control module configured to output a feedback control signal for modifying a drive signal received by a modulator. The method comprises determining a modulation index within the over-modulation range; and, controlling the feedback control module to adjust the feedback control signal based on the modulation index.Type: GrantFiled: September 11, 2019Date of Patent: November 15, 2022Assignee: VESTAS WIND SYSIEMS A/SInventors: Ciprian Biris, Kent Tange, Gert Karmisholt Andersen, Duy Duc Doan, Torsten Lund, Lars Meyer
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Patent number: 11495967Abstract: This invention relates to a method of controlling at least one wind turbine of a plurality of wind turbines connected to an electrical grid at a predefined point in the electrical grid. The wind turbine comprises a DC link connecting a generator side converter to a line side converter, where the line side converter is controlled according to a modulation index requested by a power converter controller. The method comprises determining a harmonic frequency signal indicative of a harmonic frequency value at the predefined point in the electrical grid; determining a deviation between the harmonic frequency signal and a permissible harmonic frequency value; determining a permissible modulation index based on the deviation; comparing the permissible modulation index to the modulation index requested by the power converter controller; and, altering a DC link voltage set-point based on the comparison between the permissible modulation index and the requested modulation index.Type: GrantFiled: September 11, 2019Date of Patent: November 8, 2022Assignee: VESTAS WIND SYSTEMS A/SInventors: Torsten Lund, Ciprian Biris, Kent Tange, Duy Duc Doan, Gert Karmisholt Andersen
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Publication number: 20220246248Abstract: State of the art techniques used for Flue Gas Desulpharization (FGD) process monitoring fail to comprehend the relationship between various process parameters, which is crucial in determining the performance of a FGD process being monitored. The disclosure herein generally relates to industrial process monitoring, and, more particularly, to a method and system for performance optimization of Flue Gas Desulphurization (FGD) Unit. The system identifies Key Performance Indicators (KPIs) associated with the process being monitored, and identifies parameters associated with each KPI. This information is used to generate several predictive models, from which a predictive model having the highest value of composite model score amongst the predictive models is selected as the predictive model for processing the input data, which is then used to perform optimization of the FGD process.Type: ApplicationFiled: June 27, 2020Publication date: August 4, 2022Applicant: Tata Consultancy Services LimitedInventors: RAJAN KUMAR, PALLAVI VENUGOPAL MINIMOL, SAGAR SRINIVAS SAKHINANA, ABHISHEK BAIKADI, DUC DOAN, VISHNU SWAROOPJI MASAMPALLY, VENKATARAMANA RUNKANA
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Publication number: 20220123667Abstract: This disclosure proposes a topology that integrates a DC chopper into the Modular Multilevel Converter (MMC) cells of a power converter. The integrated DC chopper may include chopper resistors that may also be advantageously integrated into a heat sink for a power module comprising at least the power transistors of the MMC cell. Embodiments herein also describe a method for using an MMC cell's IGBTs and chopper resistors for providing a safe discharge of both cell capacitors and DC-link capacitors in different operating conditions.Type: ApplicationFiled: December 27, 2021Publication date: April 21, 2022Inventors: Ciprian BIRIS, Cem Özgür GERÇEK, Lars HELLE, Duy Duc DOAN, Tune PEDERSEN
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Patent number: 11286904Abstract: A method for use in controlling a wind turbine generator of a wind power plant based on a condition of a power converter or a component forming part of a power converter in the wind power plant. The method comprises determining the initial condition of the power converter or a component forming part of a power converter and determining the evolution of the condition from the initial condition based on notional power reference values of the wind turbine generator. The method further comprises comparing the evolution of the condition to a predetermined threshold and determining, from the comparison, a time period by which the condition of the power converter or a component forming part of a power converter will substantially equal the predetermined threshold.Type: GrantFiled: December 5, 2018Date of Patent: March 29, 2022Assignee: VESTAS WIND SYSTEMS A/SInventors: Gert Karmisholt Andersen, Lars Helle, Poul Møhl Dyrlund, Morteza Rabi, Duy Duc Doan
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Patent number: 11211878Abstract: A Direct Current (DC) chopper may be integrated into the Modular Multilevel Converter (MMC) cells of a power converter. The integrated DC chopper may include chopper resistors that may also be advantageously integrated into a heat sink for a power module including at least the power transistors of the MMC cell. The safe discharge of both cell capacitors and DC-link capacitors in different operating conditions is performed using Insulated-Gate Bipolar Transistors (IGBTs) and chopper resistors of an MMC cell.Type: GrantFiled: August 12, 2020Date of Patent: December 28, 2021Assignee: VESTAS WIND SYSTEMS A/SInventors: Ciprian Biris, Cem Özgür Gerçek, Lars Helle, Duy Duc Doan, Tune Pedersen
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Publication number: 20210376749Abstract: This invention concerns a method of controlling a line side converter of a power converter system operating in an over-modulation range. The line side converter comprises a controller comprising a feedback control module configured to output a feedback control signal for modifying a drive signal received by a modulator. The method comprises determining a modulation index within the over-modulation range; and, controlling the feedback control module to adjust the feedback control signal based on the modulation index.Type: ApplicationFiled: September 11, 2019Publication date: December 2, 2021Inventors: Ciprian BIRIS, Kent TANGE, Gert Karmishoit ANDERSEN, Duy Duc DOAN, Torsten LUND, Lars MEYER
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Publication number: 20210351714Abstract: This invention concerns a method of controlling a power converter system 26 operating in an overmodulation region. The power converter system 26 comprises more than two current controllers 71, 73, 77, 79 a modulator 76 and a power converter 78, and the modulator 76 is configured to provide at least one modulated drive signal 87 to the power converter 78 based on voltage reference vector signals 82a, 82b, 82c, 82d from the more than two current controllers 71, 73, 77, 79. The method comprises determining the voltage reference vector signals 82a, 82b, 82c, 82d; determining compensated voltage reference vector signals 84a, 84b, 84c, 84d indicative of a fundamental frequency of a respective voltage reference vector signal 82a, 82b, 82c, 82d; and, determining the at least one modulated drive signal 87 based on a combination of the compensated voltage reference vector signals 84a, 84b, 84c, 84d.Type: ApplicationFiled: September 19, 2019Publication date: November 11, 2021Inventors: Ciprian BIRIS, Kent TANGE, Duy Duc DOAN, Gert Karmisholt ANDERSEN, Torsten LUND, Lars MEYER
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Publication number: 20210050796Abstract: This disclosure proposes a topology that integrates a DC chopper into the Modular Multilevel Converter (MMC) cells of a power converter. The integrated DC chopper may include chopper resistors that may also be advantageously integrated into a heat sink for a power module comprising at least the power transistors of the MMC cell. Embodiments herein also describe a method for using an MMC cell's IGBTs and chopper resistors for providing a safe discharge of both cell capacitors and DC-link capacitors in different operating conditions.Type: ApplicationFiled: August 12, 2020Publication date: February 18, 2021Inventors: Ciprian BIRIS, Cem Özgür GERÇEK, Lars HELLE, Duy Duc DOAN, Tune PEDERSEN
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Patent number: 10917018Abstract: A flyback converter is provided with a controller that is configured to analyze the reflected feedback voltage waveforms to determine the presence of a ground connection fault for the auxiliary winding.Type: GrantFiled: May 22, 2018Date of Patent: February 9, 2021Assignee: DIALOG SEMICONDUCTOR INC.Inventors: Pengju Kong, Duc Doan, Fuqiang Shi
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Publication number: 20200392942Abstract: A method for use in controlling a wind turbine generator of a wind power plant based on a condition of a power converter or a component forming part of a power converter in the wind power plant. The method comprises determining the initial condition of the power converter or a component forming part of a power converter and determining the evolution of the condition from the initial condition based on notional power reference values of the wind turbine generator. The method further comprises comparing the evolution of the condition to a predetermined threshold and determining, from the comparison, a time period by which the condition of the power converter or a component forming part of a power converter will substantially equal the predetermined threshold.Type: ApplicationFiled: December 5, 2018Publication date: December 17, 2020Inventors: Gert Karmisholt ANDERSEN, Lars HELLE, Poul Møhl DYRLUND, Morteza RABI, Duy Duc DOAN
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Patent number: 10859064Abstract: A power conversion system for a wind turbine generator, comprising a machine-side converter having an AC voltage input from a generator and a DC voltage output to a DC link, wherein the machine-side converter is a modular multi-level converter comprising one or more converter legs corresponding to a respective one or more electrical phases of the generator, each of the converter legs comprising a plurality of converter cells, the system further comprising: a converter control module which provides the machine-side converter with a gate signal, and an electrical frequency estimation module configured to estimate the mean electrical frequency of the generator; wherein the gate signal has at least one mean switching frequency corresponding to at least one electrical phase of the generator; wherein the converter control module is configured to modulate the mean switching frequency of the gate signal in dependence on the mean electrical frequency of the generator.Type: GrantFiled: November 29, 2017Date of Patent: December 8, 2020Assignee: VESTAS WIND SYSTEMS A/SInventors: Ciprian Biris, Duy Duc Doan, John Godsk Nielsen
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Patent number: 10774809Abstract: Controlling a power converters during over voltage condition. A wind turbine signal is monitored for detection of an over voltage of the grid and upon detection of the over voltage, an over-modulation mode is initiated wherein the grid side converter is operated with a modulation index being increased in an over-modulation range at least during a sub-period of the over-modulation mode, and upon the detection of the operational condition, a DC-voltage adjustment mode is initiated wherein the DC voltage of the DC link is decreased from a second voltage level towards a first voltage level at least during a sub-period of the DC-voltage adjustment mode.Type: GrantFiled: September 27, 2018Date of Patent: September 15, 2020Assignee: VESTAS WIND SYSTEMS A/SInventors: Ciprian Biris, Kent Tange, Duy Duc Doan, Torsten Lund, Gert Karmisholt Andersen
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Patent number: 10700624Abstract: A method of controlling a wind turbine generator (1) comprising an electrical generator (10) and a power converter (12), the power converter (12) comprising an electrical switch (14a, 14b) that is configured to process electrical power produced by the electrical generator (10), the method comprising: controlling an output from the electrical switch (14a, 14b) using a variable pulse-width modulated control signal, thereby to control characteristics of output power from the power converter (12); acquiring sample data (26) relating to an electronic signal within the wind turbine generator (1), wherein the sample data (26) is used for controlling the wind turbine generator (1); and dynamically adjusting a frequency (30) at which the sample data is acquired to synchronise data acquisition with a carrier frequency (24) of the control signal.Type: GrantFiled: August 11, 2017Date of Patent: June 30, 2020Assignee: VESTAS WIND SYSTEMS A/SInventors: Gert Karmisholt Andersen, Kent Tange, Søren Andersen, Duy Duc Doan, Jens Peter Biltoft, Lars Helle, John Godsk Nielsen
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Patent number: D990577Type: GrantFiled: September 28, 2021Date of Patent: June 27, 2023Assignee: IGTInventors: Anthony John Baerlocher, Stewart Thoeni, Christopher D. Carlisle, Julia Janeen Angst, Jean-Pierre Legras, John Leagh Beadell, Scott Hamilton Jones, Juan Carlos Hernandez, Megan Eileen Oehlert, Stephen Gus Gill, Thang Duc Doan, Matthew Arbie Franich, Tai Rosander