Electrical load simulator based on velocity-loop compensation and improved fuzzy-PID

Research on electrical load simulator (ELS) which is directly driven by permanent magnet synchronous motor (PMSM), and build up mathematical model of ELS. Analyze the couple relationship between torque motor and actuator, and the generating mechanism of extraneous torque in ELS, conclude that extraneous torque is directly related to the velocity of actuator, so propose velocity-loop compensation algorithm to eliminate extraneous torque of ELS. Aiming at requirement of high frequency response and kinds of nonlinear factors of ELS, the traditional PID control theory cannot meet the demand of control accuracy, so research on fuzzy control with non-uniform membership function, then combine fuzzy control and PID control with exponential function to avoid the sudden change of control output when switching between fuzzy and PID. And the results of experiments prove that ELS based on velocity-loop and improved fuzzy-PID has excellent performance.