Abstract：In this paper, a novel high order power filter is proposed, named the LCCL filter. Compared with the traditional LCL filter, the LCCL filter composes a parallel resonant branch loop at the switching frequency by paralleling a small capacitor with the line side inductor. The parallel resonance enables the line side branch loop to exhibit infinite impedance at the switching frequency. Particularly, it can attenuate the switching frequency current ripple components much better than the LCL filter, thus decreases THD in source current. Compared with the LLCL filter, the LCCL filter performs well considering the case where parameters are not fixed and exhibits better attenuation ability in the high frequency domain when the source impedance is considered. Besides, a capacitor current feedback based active damping controller is easy to design on the LCCL filter. As an interface between voltage source inverter (VSI) and the grid, the LCCL filter can be applied to the PWM rectifier, active power filter (APF), and unified power quality controller (UPQC). A half-bridge APF is taken as an example in this paper to discuss the parameter selection method and the controller design method based on the LCCL filter. At last, simulation and experimental results validate the feasibility of the proposed LCCL filter.
方旌扬, 肖国春, 郑力夫, 郑家禄. 一种LCCL滤波器及其在半桥电力有源滤波器中的应用[J]. 电工技术学报, 2016, 31(22): 125-136.
Fang Jingyang, Xiao Guochun, Zheng Lifu, Zheng Jialu. An LCCL Filter for a Half-Bridge Active Power Filter. Transactions of China Electrotechnical Society, 2016, 31(22): 125-136.
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