有源电力滤波器中LCL滤波器的设计

Design of LCL Filter in Active Power Filter

与传统L滤波器相比,LCL滤波器具有更高的高频阻抗,可更好地滤除开关纹波电流。但LCL滤波器是一个三阶系统,参数设计更复杂,不仅要考虑其开关纹波电流抑制能力和谐振频率处谐波电流引起的谐振问题,还要考虑LCL滤波器对有源电力滤波器(APF)跟踪性能的影响。通过绘制LCL滤波器波特图,进一步简化LCL滤波器的传递函数,得出一种简便的LCL滤波器设计方法。最后通过仿真和实验验证了所提LCL滤波器设计方法的正确性和有效性。

Compared with the traditional L filter, LCL filter has a higher impedance at high frequency, which means better performance at filtering out the switching ripple current.The LCL filter is a three-order system, the design of parameters will be more complex.The switching ripple current suppression capability of LCL filter, the resonance problems caused by harmonic currents at resonant frequency, and the impact of LCL filter on tracking performance for active power filter（APF） should be considered.The mathematical model of LCL filter is simplified through drawing the bode diagram of the filter output function and a effective design method for LCL filter is obtained.Simulation and experimental results indicate the correctness and effectiveness of the proposed LCL filter design method.