一种前端级联 DC / DC 变换器的 开关磁阻电机驱动拓扑

针对开关磁阻电机传统不对称半桥功率变换器在电动汽车应用中的不足,提出了一种新型 DC/ DC 变换器级联在不对 称半桥功率变换器前端,以实现母线电压的调节以及制动能量的可控回馈。 首先,理论分析了变换器的工作模式;其次,分别建 立了励磁电压、退磁电压和关断角关于转速、负载的查找表,从而根据电机工况匹配合适的母线参考电压,并给出了系统整体的 闭环控制方案;最后,在一台三相 6 / 4 结构开关磁阻电机上进行了实验,实验结果验证了提出的新型功率变换器的有效性。

Switched reluctance motor drive topology with front-end cascaded DC / DC converter

In view of the shortcomings of the traditional asymmetric half bridge (AHB) power converter of switched reluctance motor ( SRM) in electric vehicle drives, a novel DC/ DC converter cascaded at the front-end of the AHB power converter is proposed to realize the regulation of DC-link voltage and the controllable feedback of braking energy. Firstly, the operating modes of the power converter are analyzed theoretically. Then, the look-up tables of the excitation voltages, the demagnetization voltages and the turn-off angles about speeds and loads are established, respectively, so as to match the proper DC-link reference voltage according to the motor working conditions. And the overall closed-loop control scheme is given. Finally, the experiments are carried out on a three-phase 6 / 4 switched reluctance motor and the experimental results verify the effectiveness of the proposed power converter.