Dead-beat Predictive Control of Permanent Magnet Synchronous Motors with Improved Dead-time Compensation

Abstract

Deadbeat predictive control has attracted wide attention in recent years due to its advantages of fast dynamic response. In order to improve the low-speed steady-state performance of dead-beat predictive control for permanent magnet synchronous machines(PMSMs), a novel dead-time compensation method that can simultaneously compensate the dead-time error voltage and eliminate the phenomenon of zero-current clamping was proposed in this paper. Firstly, the voltage error caused by the dead-time and the nonlinearity of inverter were analyzed; secondly, a low-pass filter was used to eliminate the high-frequency noise signal in the phase current; finally, the compensation voltage was calculated by combining the current polarity judgment and optimized sinusoidal switching function. In this paper, an experimental comparison study is carried out. The results show that the proposed method can effectively reduce the current distortion caused by the dead-time and suppress the zero-current clamping phenomenon.