STEAM TURBINE GENERATOR OUTPUT CONTROL DEVICE PERFORMING MAIN STEAM PRESSURE CONTROL

摘要

PROBLEM TO BE SOLVED: To smoothen the control by making the integrating item of a generator output controller stand by at the value obtained by adding a bias value to the value calculated backward from main steam control valve and extraction governing valve opening instructions, and switching main steam pressure control to generator output control immediately when the generator output becomes larger than a generator output set value.;SOLUTION: A generator output controller integrating item suppression computing element 7 makes the output obtained by adding a bias to the value calculated backward from the output of a generator output controller stand by in a low value selector 8 after main steam control valve and extraction governing valve opening instructions are regulated by use of coefficients a22, a12 and biases δ1, δ2. Consequently, the generator output controlling main steam control valve opening instruction stands by at a value slightly larger than the main steam pressure controlling main pressure control valve opening instruction. When a main steam pressure 3b is larger than a main steam pressure set value 3a, the main steam pressure controlling main steam control valve opening instruction increases, and a main steam regulating valve 12 moves in the opening direction to increase the generator output. Then, a generator output value 1b then becomes larger than a generator output set value 1a, and this opportunity is taken to switch the control to generator control.;COPYRIGHT: (C)2000,JPO