Patents by Inventor Sridhar Sahukari
Sridhar Sahukari 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: 9863401Abstract: The present invention relates to a wind power plant, with at least one wind turbine generator, where each of the at least one wind turbine generator has a first voltage controller with a first bandwidth, arranged for controlling a voltage level, and where the wind power plant has a power plant controller with a second voltage controller with a second bandwidth also arranged for controlling the voltage level, the first bandwidth is larger than the second bandwidth. The invention also relates to a method for controlling the voltage level of a wind power plant, by using multi bandwidth voltage controllers.Type: GrantFiled: September 28, 2012Date of Patent: January 9, 2018Assignee: VESTAS WIND SYSTEMS A/SInventors: Sridhar Sahukari, Kouroush Nayebi, Peter Frederick Mayer
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Patent number: 9466034Abstract: Embodiments for determining an optimal configuration for a renewable energy power plant are provided. The power plant, which may be a virtual power plant, includes one or more generator devices and one or more energy storage devices that may be operated to undertake one or more operating applications. Data indicative of the power output of the power plant and the voltage level at the energy storage system connection point is received as an input. Using this data, combinations of energy storage devices and operating applications stored on a database are processed and, for each energy storage and operating application pair, a value indicative of the profitability of undertaking the operating application is determined. These values are used to rank the combinations of energy storage devices and operating applications according to their profitability, which in turn is used to select the most efficient or profitable application/energy storage pair.Type: GrantFiled: April 30, 2012Date of Patent: October 11, 2016Assignee: Vestas Wind Systems A/SInventors: Daniel Viassolo, Sridhar Sahukari, Gerald Murphy, Bo Hesselbæk, Jianhui Zhang, Aditya Upadhye, Yonatan Abebe, Jason Hoffman, Juan Santos, Brett Rollow
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Publication number: 20140324495Abstract: Determining when to perform preventative maintenance is an important consideration for maximizing the revenue of a wind turbine. For example, performing preventative maintenance may be cheaper than replacing turbine components when they fail. When determining to perform preventative maintenance, a maintenance scheduler may consider multiple factors. These factors may include the probability of failure, the predicted price of energy, predicted wind power production, resource constraints, and the like. Specifically, the maintenance scheduler may predict the future values of these factors which are then integrated into a net present value (NPV) for each of the components. Based on the respective NPVs, the maintenance scheduler may determine which maintenance actions to perform and in what order.Type: ApplicationFiled: February 21, 2014Publication date: October 30, 2014Applicant: VESTAS WIND SYSTEMS A/SInventors: Yu ZHOU, Mohamed Faisal Bin MOHAMED SALLEH, Sridhar SAHUKARI, Pey Yen SIEW, Sunita SINGH, Wanying CHEN, Scott MUTCHLER
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Publication number: 20140300108Abstract: The present invention relates to a wind power plant, with at least one wind turbine generator, where each of the at least one wind turbine generator has a first voltage controller with a first bandwidth, arranged for controlling a voltage level, and where the wind power plant has a power plant controller with a second voltage controller with a second bandwidth also arranged for controlling the voltage level, the first bandwidth is larger than the second bandwidth. The invention also relates to a method for controlling the voltage level of a wind power plant, by using multi bandwidth voltage controllers.Type: ApplicationFiled: September 28, 2012Publication date: October 9, 2014Applicant: VESTAS WIND SYSTEMS A/SInventors: Sridhar Sahukari, Kouroush Nayebi, Peter Frederick Mayer
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Publication number: 20130030784Abstract: Embodiments for determining an optimal configuration for a renewable energy power plant are provided. The power plant, which may be a virtual power plant, includes one or more generator devices and one or more energy storage devices that may be operated to undertake one or more operating applications. Data indicative of the power output of the power plant and the voltage level at the energy storage system connection point is received as an input. Using this data, combinations of energy storage devices and operating applications stored on a database are processed and, for each energy storage and operating application pair, a value indicative of the profitability of undertaking the operating application is determined. These values are used to rank the combinations of energy storage devices and operating applications according to their profitability, which in turn is used to select the most efficient or profitable application/energy storage pair.Type: ApplicationFiled: April 30, 2012Publication date: January 31, 2013Applicant: VESTAS WIND SYSTEMS A/SInventors: Daniel VIASSOLO, Sridhar SAHUKARI, Gerald MURPHY, Bo HESSELBÆK, Jianhui ZHANG, Aditya UPADHYE, Yonatan ABEBE, Jason HOFFMAN, Juan SANTOS, Brett ROLLOW
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Patent number: 8183706Abstract: A variable speed wind turbine is provided. The wind turbine comprises a generator, a power converter for converting at least a portion of electrical power generated by the generator wherein the power converter comprises a generator side converter, a grid side converter and a DC (direct current) link therebetween, a power dissipating unit operatively coupled to the DC link and a controller. The controller is adapted to determine a DC link voltage error signal, the DC link voltage error signal being the difference between a function of an actual DC link voltage and a function of a predefined reference DC link voltage, determine a DC link error power based on the DC link voltage error signal, determine a feed forward power and generate a duty ratio for operating the power dissipating unit based on the DC link error power and the feed forward power.Type: GrantFiled: March 8, 2011Date of Patent: May 22, 2012Assignee: Vestas Wind Systems A/SInventors: Amit Kumar Gupta, Sridhar Sahukari
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Patent number: 8093742Abstract: A variable speed wind turbine is provided. The wind turbine includes a generator, a power converter for converting at least a portion of electrical power generated by the generator, a power dissipating unit operatively coupled to the DC link, and a controller. The power converter includes a generator side converter, a grid side converter, and a DC (direct current) link therebetween. The controller is adapted to determine a DC link voltage error signal, the DC link voltage error signal being the difference between a function of an actual DC link voltage and a function of a predefined reference DC link voltage, determine a DC link error power based on the DC link voltage error signal, determine a feed forward power, and generate a duty ratio for operating the power dissipating unit based on the DC link error power and the feed forward power.Type: GrantFiled: December 22, 2010Date of Patent: January 10, 2012Assignee: Vestas Wind Systems A/SInventors: Amit Kumar Gupta, Sridhar Sahukari
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Publication number: 20110163546Abstract: A variable speed wind turbine is provided. The wind turbine comprises a generator, a power converter for converting at least a portion of electrical power generated by the generator wherein the power converter comprises a generator side converter, a grid side converter and a DC (direct current) link therebetween, a power dissipating unit operatively coupled to the DC link and a controller. The controller is adapted to determine a DC link voltage error signal, the DC link voltage error signal being the difference between a function of an actual DC link voltage and a function of a predefined reference DC link voltage, determine a DC link error power based on the DC link voltage error signal, determine a feed forward power and generate a duty ratio for operating the power dissipating unit based on the DC link error power and the feed forward power.Type: ApplicationFiled: March 8, 2011Publication date: July 7, 2011Applicant: VESTAS WIND SYSTEMS A/SInventors: Amit Kumar Gupta, Sridhar Sahukari
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Publication number: 20110163544Abstract: A variable speed wind turbine is provided. The wind turbine comprises a generator, a power converter for converting at least a portion of electrical power generated by the generator wherein the power converter comprises a generator side converter, a grid side converter and a DC (direct current) link therebetween, a power dissipating unit operatively coupled to the DC link and a controller. The controller is adapted to determine a DC link voltage error signal, the DC link voltage error signal being the difference between a function of an actual DC link voltage and a function of a predefined reference DC link voltage, determine a DC link error power based on the DC link voltage error signal, determine a feed forward power and generate a duty ratio for operating the power dissipating unit based on the DC link error power and the feed forward power.Type: ApplicationFiled: December 22, 2010Publication date: July 7, 2011Applicant: VESTAS WIND SYSTEMS A/SInventors: Amit Kumar Gupta, Sridhar Sahukari