Abstract:

In order to weaken the effect of dead-time in space vector pulse width modulation on the speed control system of permanent magnet synchronous motor, the nonlinear model of the inverter and the model of the whole system are established respectively. Combined with model reference control and sliding mode control, a double closed-loop second-order sliding mode control method based on voltage reference model is proposed. This method can reduce the chattering phenomenon in traditional sliding mode control, meanwhile realize automatic compensation for the nonlinear disturbances of the inverter. Simulation results show that the proposed method can ensure global stability, strong robustness, accurate and fast speed control performance; it can also reduce current harmonic and torque pulse evidently.

Key words: electrical engineering, variable structure control, permanent magnet synchronous motor, inverter, dead-time, high-order sliding mode control