有源电力滤波器多内模复合控制策略控制分析

Analysis on Multi-Internal Mode Composite Control Strategy of Active Power Filter

为消除单一通过矢量谐振(VR)进行控制时面临的缺陷,采用重复控制(RC)并合理设置校正因子,设计了多内模控制器,通过对RC进行充分控制的方式达到跟踪与控制谐波分量的作用。采用MATLAB软件建立了上述系统模型并完成仿真测试。研究结果表明:电压与电流总谐波失真(THD)都低于1%,并没有发生明显畸变,呈现正弦波的特征。以上测试结果显示,在负荷处于纯阻性三相平衡状态下,微电网系统可以达到良好的功率平衡状态,确保用户获得高质量的供电。在负荷达到三相线性平衡的状态时,不管微电网系统是处于孤岛模式还是并网模式,该控制器均获得良好运行。尤其是遇到孤岛模式无法获得大电网支持时,需要通过三相四线制有源电力滤波器(APF)实施谐波治理以获得稳定正弦波。该研究对提高APF多内模复合控制策略控制效率,保证配电网系统的安全运行起到一定的理论支撑。

In order to eliminate the defects of single vector resonance(VR)control,a multi-internal mode controller is designed to track and control the harmonic components by means of full control of repetitive control(RC),adopting RC and reasonable setting of correction factor.The above system model is established and the simulation test is completed using MATLAB software.The results show that both voltage and current total harmonic distortion(THD)are less than 1%,and there is no obvious distortion.The characteristics of sine wave are shown.It’s indicated that while the load is in the state of pure resistance three-phase balance,the micro-grid system can achieve a good power balance to ensure users to get high-quality power supply.When the load reaches the state of three-phase linear balance,no matter the micro-grid system is in isolated island or grid-connected mode,the operation is in a good order.In particular,when the isolated island mode cannot be supported by the large power grid,it is necessary to implement harmonic control through the three-phase four-wire system active power filter(APF)to obtain the stable sine wave.This study has some theoretical support for improving the control efficiency of APF multi-internal mode composite control strategy and ensuring the safe operation of distribution network system.