Research on the current control method of PMSM based on the improved sliding mode controller

Abstract

Abstract Times are changing with each passing day, and permanent magnet synchronous motors are becoming popular in the new energy industry on account of its power consumption conversion rate is the same, its pollution is relatively small. For the problems of Buffeting and error when the system reaches stability vector control of PMSM, paper researches and tenders a kind of vector control based on a double power sliding mode permanent magnet motor. First, the traditional PI controller is replaced by a modified convergence-law sliding mode control in the current loop to improve overshoot and sliding mode jitter, new system stability is determined using Lyapunov function. Finally, simulation system in MATLAB/simulink is built, and the double-power sliding mode approach law, common sliding mode approach law, and PI control are compared and verified, and the waveforms of the three methods are compared. Paper, method of double power reaching law is used to track and control the current loop, the innovation point is that the double exponential law of approach, its advantage in (1) compared with other general convergence speed law of approach of sliding mode control(SMC) for faster relative to the general SMC (2) the steady-state error is smaller, effectively prevent the chattering.