基于预测控制技术的逆变-电机系统共模干扰抑制

共模电压幅值大小是衡量电磁干扰强弱的重要指标,较大的共模电压会对电机绕组间绝缘和电机轴承产生严重的危害。通过电压源逆变器驱动的三相电机共模电压的建模控制与分析,发现模型预测控制可以有效减小共模电压,比传统的屏蔽滤波技术有减少成本与体积等优势,但会带来输出电流波形的畸变。在传统的三相感应电机电流预测控制基础上,引入共模电压幅值的影响,通过调节代价函数相应影响因子的权重,达到低输出电流畸变与低共模电压的平衡。通过仿真分析验证了此控制策略的有效性与可行性。

Common-mode Voltage Suppression to Inverters-fed AC Motor System Based on Predictive Control Technology

The common-mode voltage amplitude size is one of the important index to measure electromagnetic interference intensity, larger common-mode voltage can lead to severe hazards to the motor winding insulation and bearings. Through control modeling and analyzing to the common-mode voltage of three-phase motor, which driven by the voltage source inverter, found that the model predictive control(MPC) can effectively reduce common-mode voltage with less cost and size than the traditional blocking and filtering technology. However, MPC will bring the output current waveform distortion. Based on the current predictive control to the traditional three-phase induction motor, this paper introduces the influence of common-mode voltage amplitude, by adjusting the weights of the cost function to find a good balance between low current distortion and common-mode voltage reduction. This control strategy is verified through the simulation analysis which is proved to be effective and feasible.