Methods for rotational speed control of marine circulating water pump based on fuzzy logic

  Objectives  The rapid change of load of the marine steam turbine easily leads to violent fluctuation in the vacuum degree of the condenser. In order to stabilize the vacuum rapidly, a fuzzy controller is designed to regulate the rotational speed of the circulating water pump.

  Methods  It was optimized by adding the steady state preset value of the pump and the interpolation of fuzzy variables. The optimization overcame the shortcomings of traditional fuzzy controller such as large steady state error and poor stability. Through the simulation of thermal system, the control effect of the optimized fuzzy controller was verified.

  Results  The verification results show that, compared with conventional PID control, the optimized fuzzy controller enables a reduction in time for vacuum of the condenser to be stabilized about 50% and a reduction in maximum error about 40%.

  Conclusions  Therefore, the optimized fuzzy control is an effective method to realize fast rotational speed regulation of the circulating pump.