A method for anticipating and controlling overspeed of a steam turbine according to load alteration of generator

摘要

the present invention is a generator of load variation in accordance with the steam turbine overspeed for ways to generate prediction and control provides a ; To this end the present invention, when the circuit breaker (3) of the generator (1) is closed, the driving force of the steam turbine (1) (a: vapor pressure) and the generator current ( b) compared to the driving force (a) and the difference between the set value of the generator current (b) (A: for example, 40%) than the larger and, when the circuit breaker (3) is closed, the generator 1, a steam turbine speed When the acceleration rate (d) to determine the condition 2 is larger than the set value (C) satisfies the condition 2, the amount of steam control valve steam quantity control valve (5) to output the rapid closing signal (i) by the control unit 21 characterized in that the rapid closure of. ; Thus, according to the present invention, the overspeed reduces possibility of occurrence of the malfunction prediction and control and at the same time improving the reliability and stability of the entire power supply of the power plant power supply can be.