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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。
Parallel active power filter (APF) requires higher compensation bandwidth and lower switching ripple content. The LCL filter is a good choice for the APF output filter due to its low band gain and high band attenuation. But the LCL filter is a third-order system, the design is more complex and there is a resonance point oscillation problem. The existing papers mainly analyze the performance of LCL filter through MATLAB simulation, and can not give a quantitative formula description. The author deduces the S-domain transfer function of the LCL filter with damping resistance and decomposes it into the combination of several typical systems. The mathematical derivation is used to analyze the influence of the various parameters of the LCL filter on the system performance in detail. Parameter adjustment provides a theoretical basis. Simulation and experimental results prove the correctness of the proposed theory.