基于BQZSI与MRAS的电动汽车驱动控制与改善

EV Drive Control and Improvement Based on BQZSI and MRAS

在电动汽车中,基于DC-DC变换器级联的电压型逆变器被广泛应用,为了获得负载侧较高的电压通常需提高直流侧电压,但这样做增加了额外成本。为避免因速度传感器带来的硬件复杂以及实现能量的双向流动,文中采用了基于准双向Z源逆变器(BQZSI)与模型参考自适应(MRAS)对电动汽车驱动系统进行设计与控制。但考虑到该系统在低速或频繁启动时控制性能不佳的问题,故采用模糊逻辑控制器对该系统进行了改善使之在较低的速度下依然有较高的控制精度与性能。最后,通过仿真验证系统的可行性与性能的改善。

The voltage source inverter cascaded with a dc-dc converter is widely used in EV control. To obtain a high ac voltage in the load,the input voltage in dc side is boosted to an appropriate dc voltage level,which brings additional cost. Meanwhile to overcoming the complexity of hardware for speed sensor being used and realize bidirectional power flow,the paper designed drive system then further improved based on bidirectional quasi-Z-source Inverter（ BQZSI） and Model Reference Adaptive System（ MRAS）,However,considering the poor control performance of the system at low speed or frequent start-up,fuzzy logic is used to improve the system so that it still has higher control accuracy and performance at lower speeds. Finally,verify the feasibility and performance of the system through simulation.