基于三矢量模型预测电流控制的共模电压抑制策略

Common-Mode Voltage Suppression Strategy Based on Three-Vector Model Predictive Current Control

针对永磁同步电机(PMSM)驱动系统中存在的共模电压高、电流脉动大的问题,提出将无零矢量调制(NSPWM)方法与三矢量模型预测电流控制算法结合进行控制。已有的单矢量模型共模电压抑制策略电压矢量方向固定,可选矢量范围有限,电流脉动仍较大。而三矢量模型预测电流控制共模电压抑制策略基于NSPWM在每个扇区利用3个非零矢量合成目标电压矢量,矢量范围覆盖广。结合无差拍电流控制,在实现共模电压抑制的同时,还能减小电流脉动,提高系统动态响应。通过仿真和试验验证了所提控制策略的有效性。

High common-mode voltage and large current ripple occur in the permanent magnet synchronous motor(PMSM)drive system.Aiming at these problems,near state pulse width modulation(NSPWM)combined with a three-vector model predictive current control algorithm is proposed for the control.The existing single-vector model common-mode voltage suppression strategy has a fixed voltage vector direction,a limited range of selectable vectors,and a large current ripple.The three-vector model predictive current control common-mode voltage suppression strategy is based on NSPWM,three non-zero vectors are used in each sector to synthesize the target voltage vector,and a wide vector range is covered.Combined with deadbeat current control,while common-mode voltage suppression is realized,current ripple is reduced and system dynamic response is improved.Finally,the effectiveness of the proposed control strategy is verified by simulation and experiment.