| 摘要 |
PROBLEM TO BE SOLVED: To improve the control responsiveness by selecting the control by a main steam pressure controller in the case when a measured value of the main steam pressure is lower than a predetermined value, and controlling the opening with a constant rate of change to achieve the optimum opening as a target value in the case when a measured value of the opening of a speed governing valve is larger than the optimum opening. SOLUTION: A generator 16 is operated, a speed governing valve 5 is fully opened and the steady operation is performed by a controller 6 when the steam is supplied from a steam supply tube 15 to a steam turbine 4, and then a breaker 17 is closed to energize an electric power system 18. On this occasion, the pressure of the steam is measured by a pressure sensor 9, a measured value is compared with a predetermined value by a main steam pressure controller 7, and the control by the main steam pressure controller 7 is selected by a low selector 8 when the measured value is lower than the predetermined value. Further the opening of a speed governing valve 5 is measured by an opening sensor 14, a measured value is compared with the optimum opening by a speed governing valve controller 12, and the opening of the speed governing valve 5 is changed (reduced) by a constant rate of change to achieve the optimum opening as a target value.
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