WATER WHEEL SPEED GOVERNOR

摘要

PURPOSE:To provide a water wheel speed governor excellent in stability and quick response, by controlling the upper limit value of an integrator in PID control. CONSTITUTION:A signal corresponding to the difference between a speed deviation signal DELTAN and a speed dropping rate feedback signal supplied from a speed dropping rate setting unit 6 is applied to an auxiliary servomotor 5 through a PID controller comprising a proportion unit 1, an integration unit 2 and a differentiation unit 3. A signal corresponding to the feedback signal of the auxiliary servomotor 5 and the output of the integrator 2 is supplied from an upper deviation limit setting unit 7 to an integration limiter 8 to change the upper limit value of the integrator 2. The PID-type speed governor excellent in stability and quick response is thus obtained.