Patent ID: 9689280
Date: 2017-06-27
CPC Classifications: F01K,F01L,F16K,Y02E,Y02P

Claim:
1. A power generating plant comprising: a gas turbine; an exhaust heat recovery boiler configured to generate steam by using exhaust gas from the gas turbine; a steam turbine rotated and driven by the steam from the exhaust heat recovery boiler; a condenser configured to condense an exhausted steam from the steam turbine into water, and supplying condensed water to the exhaust heat recovery boiler; a turbine bypass system configured to make the steam flow from the exhaust heat recovery boiler to the condenser through a control valve; a pressure sensor configured to detect a pressure inside a drum generating the steam to be supplied to the turbine bypass system; and a controller configured to output, based on a set value received from an input device and a process value from the pressure sensor, an open level instruction value to the control valve so as to make the process value consistent with the set value in accordance with a predetermined sampling cycle, and configured to decrease the open level instruction value to the control valve when the set value becomes high, and the controller comprising a corrector configured to correct the set value to decrease the open level instruction value when the open level instruction value from the controller becomes larger than a predetermined value.