| 摘要 |
PURPOSE:To improve response performance and permit stress to be controlled, by controlling the flow-rate of combustion assisting fuel by selecting the smaller signal among the both signals supplied from a steam-pressure controlling means and a steam-pressure variation-rate controlling means, in a gas-steam turbine combined type generation set. CONSTITUTION:The sum of each output electric power of a gas turbine and a steam turbine is calculated in an adder 190, and is compared with a set value in a comparator 191, and the main steam pressure signal corresponding to the deviation is obtained through conversion in a converter 181, and an aimed control value A196 is obtained in an adder 192 from the actual steam pressure, and is input into a lower-value priority circuit 186. While, the steam pressure is sent into a comparator 194 through a differentiator 183, and selection is performed in load variation-rate selection devices 187-189, and the steam pressure signal is compared with the signal which is converted to a steam-pressure variation rate in a converter 185, and the output is input B into the circuit 186 through a PI calcuator. When a combustion assist control excluding apparatus 195 is made unavailable, the smaller signal among the both signals A and B is set as the valve opening degree signal 24 of a combustion assisting fuel flow-rate controlling valve. Thus, the improved response performance is obtained, and the proper stress control is permitted. |
