级联型有源电力滤波器控制技术研究

Study on the Control Method of Cascaded Active Power Filter

在高压大容量场合,传统的级联型有源电力滤波器(APF)需要对谐波和无功电流进行检测,算法复杂,且检测精度影响APF的电流补偿效果。提出一种直接电流控制(DCC)和倍频载波相移SPWM(FDCPS-SP-WM)相结合的级联型APF控制技术,具有易于实现、谐波补偿效果好等优点。首先构建了直流侧电压、网侧电流双闭环控制方案;然后对双闭环控制系统的具体实现进行了分析;最后通过一台1 k V·A,10 k Hz两H桥级联APF的原理样机进行了实验验证。

The traditional cascaded active power filter(APF)needs to detection harmonic and reactive current inhigh voltage and high power fields,the algorithm is complex,and the harmonic compensation performance isdeteriorated. The cascaded APF together with direct current control(DCC)and frequency doubling carrier phase-shifted(FDCPS-SPWM)control scheme was proposed. It has better harmonic compensation performance and easier to becontrolled. Double closed loop control scheme for the DC voltage and in- gird current was constructed,and then therealization of double closed loop control system were studied. A 1 k V·A prototype based on two H-bridge cascadedAPF operating at 10 k Hz was developed to verify the theoretical analysis.