T型三电平APF电流跟踪控制策略研究

Research on Current Tracking Control Strategy of T-type Three-level APF

有源电力滤波器(APF)可有效消除电网谐波,三电平更适合高压大功率场合,T型三电平结构可有效降低设备成本和功率损耗。在建立T型三电平APF数学模型的基础上,对滑模控制和无差拍控制2种电流控制策略进行分析,推导了相应的控制方程。利用Matlab/Simulink搭建仿真模型,对比不同电流跟踪控制策略的补偿效果;仿真和实验结果验证了这2种电流控制策略均可有效实现谐波补偿,滑模控制鲁棒性更好,无差拍控制的响应速度快、总谐波畸变率(THD)更小且抑制谐波效果更好。

Active power filter（APF） can effectively eliminate the harmonic, T-type three-level structure can effectively reduce equipment costs and power loss ,three-level are more suitable for high-voltage high-power occasions.Based on the mathematical model of T-type three-level APF, two kinds of current control strategies of sliding mode control and dead beat control are analyzed and the corresponding control equations are deduced.Simulation results show that these current control strategies can effectively achieve harmonic compensation and the sliding mode control is more robust and has no bad beat control.The simulation results show that the two current control strategies can effectively achieve harmonic compensation,fast response.total harmonic distortion（THD） smaller and less harmonic sunnression effect.