改进型LCL滤波器拓扑在有源滤波器中的应用

为了使并联有源滤波器谐波电流补偿性能、开关纹波衰减率、系统稳定性和功率损耗等方面性能得到系统的折中和优化,提出了一种改进型LCL滤波器拓扑,该结构充分利用了LCL滤波器的频率特性,在阻尼电阻两端引入开关纹波谐振分流支路,同时在阻尼电阻上串联一小电感,有效的减少了阻尼电阻的损耗而不改变系统的静态和动态性能。仿真结果证明了所提拓扑的正确性和可行性。

Application of improved LCL filter topology in active power filter

In order to optimize performances of shunt active power filter of harmonic compensation,attenuation ratio for switching ripple,stability and power losses,an improved LCL filter topology was presented based on the analysis of the frequency characteristics of the LCL filter,in which a switching-ripple shunt branch and a series-inductor were adopted to the damping resistor to reduce the power losses dramatically.With the improvement,the active power filter inherits both static and dynamic excellent performances.Simulation results validate the correctness and feasibility of the proposed topology.