General Electric Company

John Petzen

Gautam Chatterji

Systems and methods for providing override control for a feedwater pump recirculation valve are provided. According to one embodiment, a system may include a controller and a processor communicatively coupled to the controller. The processor may be configured to receive one or more measurements associated with pump motor power driving feedwater pump flow. The feedwater pump recirculation valve may be configured to maintain a predetermined minimum recirculation flow through the feedwater pump by regulating recirculation pump flow through a recirculation line. The processor may be also configured to calculate, based at least in part on the one or more measurements, the recirculation pump flow, and compare the recirculation pump flow to the predetermined minimum recirculation flow. Based at least in part on the comparing, the processor may selectively provide an override control signal to the feedwater pump recirculation valve to selectively modify the recirculation pump flow.

Systems and methods for providing override control for a feedwater pump recirculation valve

A combined cycle power plant may include a gas turbine comprising a feed forward signal generator and configured to operate in one of one or more firing modes and generate exhaust gas and a heat recovery steam generator configured to receive the exhaust gas and extract thermal energy from the exhaust gas to generate steam. The feed forward signal generator may be configured to generate a feed forward signal that is used to control the temperature of the steam generated by the heat recovery steam generator.

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Salem, VA, United States of America

John Petzen