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并联有源滤波器LCL滤波器特性分析及设计方法

, PP. 191-198

Keywords: 并联有源滤波器,LCL滤波器,阻尼比,谐振

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Abstract:

基于频域分析的方法,本文研究了并联有源滤波器中LCL滤波系统的特性,着重讨论了不同负载条件对滤波系统的影响。其中感性负载与空载情况类似,容性负载会引入新的谐振峰,阻性负载会增加系统的阻尼比,而在谐波源负载时对滤波系统的模型进行了改进,滤波器输出电流的幅值和相位都将发生改变。基于以上分析,本文提出一种系统的LCL滤波器设计方法,包含总连接电抗值、阻尼比、开关噪声衰减度、谐振频率四组约束条件。根据滤波器的设计目标,合理确定系统的阻尼比,再通过反推校正的方法优化滤波器的性能。仿真和实验证明了本文所提出的LCL滤波系统分析及设计方法的正确性及适用性。

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