In view of the low voltage level of electric vehicle power battery and low efficiency of driving system, the quasi-Z source inverter is used to improve dynamic performance of the interior permanent magnet synchronous motor driving system for electric vehicles, and hybrid efficiency optimization control is adopted for system steady state. The operating characteristics of quasi-Z source inverter are analyzed, a control strategy of DC bus voltage is proposed and quasi-Z source capacitance voltage expression is determined. Efficiency optimization control is used in steady state, motor loss expression is deduced, and the optimized ratio between excitation component and torque component of air gap current is calculated to get the direct axis current sub optimal value. Then with this value as initial value, an improved golden section algorithm which is fast and robust is used to find the best system operating point. The dynamic stator current distribution is also added to improve the dynamic response speed of the motor. Simulation and experimental results show that, the proposed control strategy can significantly improve the dynamic performance in high speed area and response speed of driving motor, also the steady-state efficiency of system is improved about 4%.
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