抑制四脚间接矩阵变换器共模电压的控制策略

Control Strategy of Four-leg Indirect Matrix Converter for Reducing Common-mode Voltage

为了抑制四脚间接矩阵变换器工作时产生的共模电压,提出一种新的调制型模型预测方法.采用调制型模型预测控制分别在整流级和逆变级寻找最优矢量组,将逆变级的零矢量分配到整流级,消除逆变级的零矢量,在不改变硬件电路的前提下,有效降低共模电压.重新规定各矢量的顺序,确保逆变级在整个周期内只有一个桥臂上的开关工作.仿真结果验证了该控制策略的可行性与有效性.

To reduce the common-mode voltage of four-leg indirect matrix converter,a new modulated model predictive control method is proposed.Firstly,the modulated model predictive control is used to find the optimal vector group at the rectifier stage and the inverter stage,respectively.Secondly,the zero vector of the inverter stage is allocated to the rectifier stage to eliminate the zero vector of the inverter stage,and the common-mode voltage is effectively reduced without changing the hardware circuit.Then,the sequence of each vector is redefined to ensure that only one switch on the bridge arm works in the whole sampling period.Finally,the simulation results verify the feasibility and effectiveness of the control strategy.