PMSM driving system design for electric vehicle applications based on bi-directional quasi-Z-source inverter

摘要

When operating up the base speed, permanent magnet synchronous motor(PMSM) is usually controlled by flux-weakening methods, which is realized by generating d-axis demagnetization current and then lowers the system efficiency. Limited by inverter voltage and current level, the motor output power has also been limited. In this paper, we proposed a bus voltage variable PMSM drive system based on quasi-Z-source, expecting to improve the system efficiency. Experimental results prove the feasibility of this scheme.