A Permanent Magnet Synchronous Motor drive employing a three-level Very Spars Matrix Converter with soft switching and SVM hysteresis current control

Abstract

Proposed in this paper is a three-phase three-level Very Sparse Matrix Converter (VSMC) fed Permanent Magnet Synchronous Motor (PMSM). Such a system may be designed to draw and sinusoidal input current, have high efficiency and is free of a DC-link energy storage element (inductor and/or capacitor). As discussed in this paper, the three-level inverter output stage produces reduced distortion waveforms with low switch voltage stress. Controlling the PMSM by hysteresis current control (HCC) based vector control is an efficient method especially when the flux has a sinusoidal distribution. However, a hard switching problem may arise. In this paper, a new soft switching HCC technique based on space vector modulation (SVM) combined with field oriented control (FOC) is proposed. This technique uses the zero voltage vector (ZVV) to generate the matrix converter switching signals. The proposed technique employs three modes of compensation based directly on the motor current error making the technique reliable in operation. Simulation results of three-phase three-level VSMC drives are obtained to verify this proposed switching technique.