关键词: 同步调制, 锁相环, 永磁同步电机, 仿真

Abstract: When the traditional SVPWM synchronous modulation algorithm of permanent magnet synchronous motor runs in full speed range,it has the problems of high harmonic content in high-speed zone,unable to directly switch to square wave,and large switching loss of inverter. An improved SVPWM synchronous modulation control technology which based on phase-locked loop was introduced to make the traction inverter smoothly transit to square wave working condition. The modulation algorithm was simplified, the efficiency of algorithm execution and voltage utilization were improved, the output harmonic content and the switching loss of the inverter were reduced. The simulation model was established, and the algorithm verification was performed and the harmonic content was analyzed. The rationality and feasibility of the introduced method were verified by the ground test.

Key words: synchronous modulation, phase-locked loop(PLL), permanent magnet synchronous motor(PMSM), simulation