三相电压源型逆变器馈电两相混合式步进电机预测电流控制

Predictive current control for a two-phase hybrid stepper motor fed by a three-phase voltage source inverter

双H桥馈电两相混合式步进电机(HSM)使用两个独立的控制器分别调节两相电流,存在硬件结构复杂和电流脉动大等问题,建立三相电压源型逆变器(VSI)馈电两相HSM驱动拓扑模型,提出了使用一个预测控制器同步调节两相电流的策略,实现了有限控制集模型预测电流控制(FCS-MPCC)和无差拍预测电流控制(DPCC)两种预测控制算法。首先,建立了非平衡电路结构下VSI的空间电压矢量模型;其次,通过构建电压控制集、电流预测模型及代价函数实现了FCS-MPCC;最后,通过改进空间电压矢量脉宽调制,实现了DPCC。仿真和实验结果表明,新驱动拓扑下的预测控制器具有良好的动、静态特性,电流脉动小,算法易于实现。

For the dual H-bridges fed two-phase hybrid stepper motor(HSM),two independent controllers are used to regulate two-phase currents separately,which has drawbacks such as complex hardware structure and large current ripple.A three-phase voltage source inverter(VSI)fed two-phase HSM drive topology model is established,and a strategy of using a predictive controller to adjust two-phase currents synchronously is proposed.Two typical predictive control strategies,the finite control set model predictive current control(FCS-MPCC)and deadbeat predictive current control(DPCC),were implemented.Firstly,a space voltage vector model was established under the unbalanced circuit structure.Secondly,voltage control set,current prediction model,and cost function was constructed to realize FCS-MPCC.Finally,the space vector pulse width modulation was improved to realize DPCC.Simulations and experimental results show that predictive controllers have good dynamic and static characteristics,current ripple is small,and the control algorithm is easy to be implemented.