一种新型开关磁阻电机软开关功率变换器的研究

为了实现开关磁阻电机（SRM）绕组电流或磁链的精确控制,必须提高SRM功率变换器的工作频率以提高系统的动态响应速度.然而,较高的工作频率会引起严重的电磁干扰（EMI）和开关损耗从而导致系统整体效率降低,文中结合谐振开关（RS）、直流谐振环（RDCL）和脉冲宽度调制（PWM）的优点,提出了一种新型的软开关SRM功率变换器,基工作原理为通过在非对称桥式电路的基础上增加一套换流电路,以此实现功率器件的软开关.在对变换器工作原理详细分析的基础上,导出了实现软开关的条件并给出了设计实例.仿真和实验研究证实了新型软开关SRM变换器的可行性.

STUDY OF A NOVEL SOFT-SWITCHING CONVERTER FOR SWITCHED RELUCTANCE MOTOR

To achieve the precision control of phase current or phase flux linkage in switched reluctance motor (SRM), the higher switching frequency of converter is required to increase dynamic response speed. However, higher switching frequency may cause higher switching losses, higher Electro-Magnetic Interference (EMI) and lower overall efficiency. The use of soft-switching techniques in converter can resolve these issues. A brand new soft-switching converter for SRM is presented, which has advantages of all Resonant Switch converter (RS), Resonant dc Link converter (RDCL) and Pulse Width Modulation (PWM). The addition of external commutating devices to conventional asymmetric bridge converter for SRM achieves the soft- switching of power devices. The conditions of soft switching are deduced and a practical design consideration is given. Finally, detailed simulation study of the complete system is presented and is validated with experimental results.