Patents by Inventor Sreedhar Desabhatla
Sreedhar Desabhatla 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: 20230417842Abstract: A system, in one embodiment, may include a system includes a ground fault detection system. The ground fault detection system includes a linear filter configured to receive one or more signals from a static starter system during operations of the static starter system and to produce a linear filter output. The ground fault detection system further includes a rectifier configured to rectify the linear filter output and to produce a rectifier output, and a gain system configured to multiply the rectifier output by a factor to produce a gain output. The ground fault detection system additionally includes a fault indicator system configured to indicate a ground fault based on the gain output, wherein the ground fault detection system is configured to command an action based on the ground fault.Type: ApplicationFiled: October 19, 2022Publication date: December 28, 2023Inventors: Sreedhar Desabhatla, Malepati Bhavani Sankar, John A. Leonard, Sudeep Pathak
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Patent number: 11404879Abstract: This application provides methods and systems for rapid load support for grid frequency transient events. Example electric power systems may include a turbine, a generator coupled to the turbine, where the generator is configured to provide power to an electrical grid, and a controller configured to detect a grid event, determine a rate of change of frequency (rate of change of frequency) value, determine a predicted post-grid event governor set point based on the rate of change of frequency value, and initiate a change to at least one turbine operating parameter based on the predicted post-grid event governor set point.Type: GrantFiled: March 5, 2020Date of Patent: August 2, 2022Assignee: GENERAL ELECTRIC COMPANYInventors: Sreedhar Desabhatla, Scott William Szepek
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Patent number: 11320794Abstract: An electric power system includes a generating unit, which includes a controller for controlling an operational mode of the generating unit. The electric power system also includes an event estimator communicatively coupled to the controller of the generating unit and a network estimator communicatively coupled to the event estimator. The network estimator includes a processor configured to receive status information associated with the electric power system, determine, based upon the status information, at least one characteristic of the electric power system, and transmit the at least one characteristic to the event estimator.Type: GrantFiled: May 23, 2017Date of Patent: May 3, 2022Assignee: GENERAL ELECTRIC COMPANYInventors: Ara Panosyan, Sreedhar Desabhatla, Luca Parolini, Adolfo Anta Martinez, Naresh Acharya, Krishna Kumar Anaparthi, Scott William Szepek
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Patent number: 11139764Abstract: A system includes an excitation system. The excitation system includes a memory that may store an adaptive power system stabilizer (PSS) system that may dynamically stabilize an operation of a generator system. The excitation system also includes a processor communicatively coupled to the memory that may selectively utilize the adaptive PSS system based upon a determination of whether one or more operational parameters of the generator system has met or exceeded a threshold value.Type: GrantFiled: January 11, 2017Date of Patent: October 5, 2021Assignee: General Electric CompanyInventor: Sreedhar Desabhatla
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Publication number: 20210281078Abstract: This application provides methods and systems for rapid load support for grid frequency transient events. Example electric power systems may include a turbine, a generator coupled to the turbine, where the generator is configured to provide power to an electrical grid, and a controller configured to detect a grid event, determine a rate of change of frequency (rate of change of frequency) value, determine a predicted post-grid event governor set point based on the rate of change of frequency value, and initiate a change to at least one turbine operating parameter based on the predicted post-grid event governor set point.Type: ApplicationFiled: March 5, 2020Publication date: September 9, 2021Inventors: Sreedhar DESABHATLA, Scott William SZEPEK
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Patent number: 11063539Abstract: This application provides methods and systems for rapid load support for grid frequency transient events. Example systems may include a turbine having a first controller, a generator coupled to the turbine, where the generator is configured to provide power to an electrical grid, and an exciter configured to provide a magnetic field in the generator. The exciter may include a second controller configured to monitor a first set of electrical properties associated with the electrical grid, determine that a transient event is present on the electrical grid based on the first set of electrical properties, and send a notification of the transient event to the first controller.Type: GrantFiled: October 3, 2019Date of Patent: July 13, 2021Assignee: GENERAL ELECTRIC COMPANYInventors: Luis Fernando Gutierrez, John T. Nguyen, Adnan Fareed Zafar, Yulimar Roa, Jose Carlos Sanchez, Juan Uziel Montoya, Sreedhar Desabhatla, Stephen Roy Bartlett, Maxime Buquet
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Patent number: 11056989Abstract: Embodiments of the disclosure provide a method for controlling a power plant. The method may include detecting a transient load on the power plant, and monitoring a system reactance during operation at the transient load. A system reactance of the grid is compared with a switching threshold indicative of a switching event on the set of transmission lines. If the switching threshold is exceeded, the gas turbine operates at the transient load using a first control setting with a transient fuel management profile, a transient split bias profile, and a dynamic intake parameter for the gas turbine. If the switching threshold is not exceeded but one of the electrical properties exceeds a stability threshold, the gas turbine operates at the transient load using a second control setting with the dynamic intake parameter for the gas turbine, and without the transient fuel management profile or the transient split bias profile.Type: GrantFiled: June 15, 2020Date of Patent: July 6, 2021Assignee: General Electric CompanyInventor: Sreedhar Desabhatla
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Publication number: 20210104965Abstract: This application provides methods and systems for rapid load support for grid frequency transient events. Example systems may include a turbine having a first controller, a generator coupled to the turbine, where the generator is configured to provide power to an electrical grid, and an exciter configured to provide a magnetic field in the generator. The exciter may include a second controller configured to monitor a first set of electrical properties associated with the electrical grid, determine that a transient event is present on the electrical grid based on the first set of electrical properties, and send a notification of the transient event to the first controller.Type: ApplicationFiled: October 3, 2019Publication date: April 8, 2021Applicant: GENERAL ELECTRIC COMPANYInventors: Luis Fernando GUTIERREZ, John T. NGUYEN, Adnan Fareed ZAFAR, Yulimar ROA, Jose Carlos SANCHEZ, Juan Uziel MONTOYA, Sreedhar DESABHATLA, Stephen Roy BARTLETT, Maxime Buquet
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Patent number: 10914701Abstract: Embodiments of the disclosure are directed at determining rotor deterioration in a dynamoelectric machine. Various current and voltage measurements are carried out upon an exciter assembly when the dynamoelectric machine is operated at various speeds and at various occasions over an extended period of time. More particularly, a set of current and voltage measurements that are carried out when the dynamoelectric machine is in a slow-roll mode of operation can be used for determining a resistance of a current path through which the exciter assembly provides electrical power to a rotor assembly. A time-domain-to-frequency-domain conversion can be carried out upon this set of resistance measurements in order to generate a spectral signature. The spectral signature can then be evaluated to detect an altered rotor resistance condition and/or a rotor resistance alteration trend.Type: GrantFiled: June 19, 2017Date of Patent: February 9, 2021Assignee: General Electric CompanyInventors: Sunil Unnikrishnan, Sreedhar Desabhatla, Pradeep Kumar Vavilala, Vamshi Krishna Kandula
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Patent number: 10739405Abstract: Various embodiments include a system having: at least one computing device configured to monitor a dynamoelectric machine having a rotor including an exciter electrically coupled with a field winding, by performing actions including: obtaining measured data indicating a resistance of the field winding at a plurality of rotor angular positions while the rotor is rotating at a speed below one-hundred revolutions per minute; comparing the measured data indicating the resistance of the field winding at the plurality of rotor angular positions with a threshold resistance range; and indicating a potential fault in the field winding in response to determining the measured data indicating the resistance deviates from the threshold resistance range.Type: GrantFiled: March 28, 2017Date of Patent: August 11, 2020Assignee: General Electric CompanyInventors: Sreedhar Desabhatla, James Jonathan Grant
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Publication number: 20200096960Abstract: An electric power system includes a generating unit, which includes a controller for controlling an operational mode of the generating unit. The electric power system also includes an event estimator communicatively coupled to the controller of the generating unit and a network estimator communicatively coupled to the event estimator. The network estimator includes a processor configured to receive status information associated with the electric power system, determine, based upon the status information, at least one characteristic of the electric power system, and transmit the at least one characteristic to the event estimator.Type: ApplicationFiled: May 23, 2017Publication date: March 26, 2020Inventors: Ara PANOSYAN, Sreedhar DESABHATLA, Luca PAROLINI, Adolfo ANTA MARTINEZ, Naresh ACHARYA, Krishna Kumar ANAPARTHI, Scott William SZEPEK
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Patent number: 10337348Abstract: The disclosure relates to optimization of gas turbine power plant response during power system transients. In certain embodiments, systems, methods, and apparatus can control a power generating system by using the reactive components of the current and the reactive components of the voltage and the magnitude of the voltage at the generator terminals of a gas turbine generator system. In one embodiment, a system can identify a power system fault based on at least three conditions occurring for a specified duration and at substantially the same time: (1) an increase in the reactive current, (2) a decrease in the magnitude of the voltage, and (3) an increase in the reactive power. In one embodiment, a power system can further detect a remote breaker open (RBO) condition, and distinguish a RBO condition from a power system fault condition.Type: GrantFiled: March 27, 2017Date of Patent: July 2, 2019Assignee: General Electric CompanyInventors: Sreedhar Desabhatla, John Huey, Scott Szepek
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Patent number: 10205414Abstract: A method may involve monitoring a first set of electrical properties associated with an electrical grid configured to couple to a generator and determining whether a transient event is present on the electrical grid based on the first set of electrical properties. The method may also involve determining a mechanical power present on a shaft of the generator based on a second set of electrical properties associated with the generator, the electrical grid, or both when the transient event is present and sending the mechanical power to a controller associated with a turbine configured to couple to the generator, wherein the controller is configured to adjust one or more operations of the turbine based on the mechanical power.Type: GrantFiled: May 24, 2016Date of Patent: February 12, 2019Assignee: General Electric CompanyInventors: Sreedhar Desabhatla, Scott William Szepek, Alexis Sesmat, Maxime Buquet
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Publication number: 20180274383Abstract: The disclosure relates to optimization of gas turbine power plant response during power system transients. In certain embodiments, systems, methods, and apparatus can control a power generating system by using the reactive components of the current and the reactive components of the voltage and the magnitude of the voltage at the generator terminals of a gas turbine generator system. In one embodiment, a system can identify a power system fault based on at least three conditions occurring for a specified duration and at substantially the same time: (1) an increase in the reactive current, (2) a decrease in the magnitude of the voltage, and (3) an increase in the reactive power. In one embodiment, a power system can further detect a remote breaker open (RBO) condition, and distinguish a RBO condition from a power system fault condition.Type: ApplicationFiled: March 27, 2017Publication date: September 27, 2018Inventors: Sreedhar Desabhatla, John Huey, Scott Szepek
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Patent number: 10084409Abstract: A brushless synchronous machine with a limiter for main field voltage and a method of limiting main field voltage in a brushless synchronous machine are described. The machine includes a regulator to use a field current to excite main field windings and generate the main field voltage. The machine also includes a limiter to limit the field current to maintain the main field voltage corresponding to the field current below a limit based on a transfer function.Type: GrantFiled: May 27, 2014Date of Patent: September 25, 2018Assignee: General Electric CompanyInventors: Sreedhar Desabhatla, Shashidhar Nibhanupudi
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Publication number: 20180198394Abstract: A system includes an excitation system. The excitation system includes a memory that may store an adaptive power system stabilizer (PSS) system that may dynamically stabilize an operation of a generator system. The excitation system also includes a processor communicatively coupled to the memory that may selectively utilize the adaptive PSS system based upon a determination of whether one or more operational parameters of the generator system has met or exceeded a threshold value.Type: ApplicationFiled: January 11, 2017Publication date: July 12, 2018Inventor: Sreedhar Desabhatla
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Patent number: 9906176Abstract: A method keeps a synchronous machine in a stable operating zone during large transient voltage excursions on a power grid to which the machine is connected. The machine's load angle, i.e., the position of the rotor flux with respect to the position of the stator flux, is calculated. If the load angle is not within a defined range of reference values for stable machine operation, the machine's field excitation is adjusted to bring the machine's load angle within the defined range of reference values for stable machine operation.Type: GrantFiled: June 4, 2015Date of Patent: February 27, 2018Assignee: General Electric CompanyInventor: Sreedhar Desabhatla
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Publication number: 20170363559Abstract: Embodiments of the disclosure are directed at determining rotor deterioration in a dynamoelectric machine. Various current and voltage measurements are carried out upon an exciter assembly when the dynamoelectric machine is operated at various speeds and at various occasions over an extended period of time. More particularly, a set of current and voltage measurements that are carried out when the dynamoelectric machine is in a slow-roll mode of operation can be used for determining a resistance of a current path through which the exciter assembly provides electrical power to a rotor assembly. A time-domain-to-frequency-domain conversion can be carried out upon this set of resistance measurements in order to generate a spectral signature. The spectral signature can then be evaluated to detect an altered rotor resistance condition and/or a rotor resistance alteration trend.Type: ApplicationFiled: June 19, 2017Publication date: December 21, 2017Inventors: Sunil UNNIKRISHNAN, Sreedhar DESABHATLA, Pradeep Kumar VAVILALA, Vamshi Krishna KANDULA
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Publication number: 20170346430Abstract: A method may involve monitoring a first set of electrical properties associated with an electrical grid configured to couple to a generator and determining whether a transient event is present on the electrical grid based on the first set of electrical properties. The method may also involve determining a mechanical power present on a shaft of the generator based on a second set of electrical properties associated with the generator, the electrical grid, or both when the transient event is present and sending the mechanical power to a controller associated with a turbine configured to couple to the generator, wherein the controller is configured to adjust one or more operations of the turbine based on the mechanical power.Type: ApplicationFiled: May 24, 2016Publication date: November 30, 2017Inventors: Sreedhar Desabhatla, Scott William Szepek, Alexis Sesmat, Maxime Buquet
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Publication number: 20170292996Abstract: Various embodiments include a system having: at least one computing device configured to monitor a dynamoelectric machine having a rotor including an exciter electrically coupled with a field winding, by performing actions including: obtaining measured data indicating a resistance of the field winding at a plurality of rotor angular positions while the rotor is rotating at a speed below one-hundred revolutions per minute; comparing the measured data indicating the resistance of the field winding at the plurality of rotor angular positions with a threshold resistance range; and indicating a potential fault in the field winding in response to determining the measured data indicating the resistance deviates from the threshold resistance range.Type: ApplicationFiled: March 28, 2017Publication date: October 12, 2017Inventors: Sreedhar Desabhatla, James Jonathan Grant