开关磁阻电机功率电路的软开关策略及仿真

Strategy and simulation for switched reluctance motor converters to achieve soft switching

提出一种开关磁阻电机驱动系统(SRD)功率变换器的新型软开关策略.通过在电源与开关磁阻电机(SRM)相绕组开关电路间插入准谐振直流环节电路,并在各相绕组开关上并联缓冲电容器以实现相开关的零电压开通和关断.在介绍该策略的电路拓扑及特点基础上,分析了相绕组开关零电压开通原理;结合公共开关型SRD功率变换器中公共开关的斩波过程,对电路的控制时序和谐振模式进行分析.针对谐振电感储能不同及SRM绕组电感变化对谐振的影响进行仿真.结果表明,只要参数选择合理谐振波形就不受SRM绕组电感变化的影响,并且试验验证了相开关及辅助开关的软开关特性.

A novel soft switching strategy in the power converter of switched reluctance drive（SRD） was proposed.In the strategy,a kind of parallel quasi-resonant DC link was inserted between the DC power and the control circuit of the switched reluctance motor（SRM） windings,a shunt-wound capacitance was added to every SRM phase switch,and zero-voltage switch of phase switches was realized.Based on the introduction of topology and characteristics of strategy circuit,the zero voltage turn-on principle of phase switches was analyzed.Considering the common switch′s chop in the common switch converter,the controlsequence and resonant modes were analyzed.Simulations were implemented to investigate the influenceof the energy storage change of resonant inductor and different inductance value of SRM winds on resonance.The results show that the resonant waveforms will not be affected by the change of inductancevalue of SRM winds only if the appropriate resonant parameters are selected.The soft switchingperformances of phase and auxiliary switches are validated by experiments.