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中文摘要：
并联有源电力滤波器（active power filter，APF）要求较高的补偿带宽和较低的开关纹波含量。LCL滤波器由于可以兼顾低频段增益和高频段的衰减，是APF输出滤波器的较好选择。但LCL滤波器是三阶系统。设计较为复杂且存在谐振点振荡问题。现有的论文主要是通过MATLAB仿真图形分析LCL滤波器的性能．不能给出定量的公式化描述。笔者推导了带阻尼电阻的LCL滤波器的S域传递函数，并将其分解为几个典型系统的组合，利用数学推导详细分析了LCL滤波器中各个参数变化对系统性能的影响，为LCL的参数调整提供了理论依据。仿真和实验结果证明了所提出理论的正确性。
英文摘要：
Shunt active power filter （APF） needs wide compensation range and few switching harmonic components. LCL-filter is suitable for APF because of it＇s good characteristics of amplification in low frequency and attenuation in high frequency. However, LCL-filter is a three-order system causing complex design and oscillation problem at resonance frequency. Present studies analyze the LCL-filter mainly by simulations via MATLAB without giving formulation. This paper deduces a transfer function in S domain of LCL filter with damping resistances, and decomposes the function into several typical systems to analyze the influence of each parameter variation of LCL-filter on the performance of system. Simulation and experiment validate the correctness of the proposed method.
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