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为降低AFE整流器产生的电磁干扰强度,可采用LCL滤波器限制其高次谐波电流。对经典的LCL滤波器参数计算方法进行总结,给出谐振频率计算公式,确定谐振频率点限制条件;根据载波频率点谐波衰减要求确定谐波电流限制条件;提出无功功率、纹波系数等辅助限制条件。在此基础上取折中的元件参数,并与西门子的LCL产品参数对比,验证了二者参数的一致性,为LCL滤波器的设计提供参考。
To reduce the electromagnetic interference generated by the AFE rectifier, the LCL filter can be used to limit its higher harmonic current. The calculation method of classical LCL filter parameters is summarized, and the resonant frequency calculation formula is given to determine the resonant frequency point constraints; according to the carrier frequency point harmonic attenuation requirements to determine the harmonic current limiting conditions; proposed reactive power, ripple coefficient Auxiliary restrictions. Based on this, we take the component parameters in the compromise and compare with the LCL product parameters of Siemens to verify the consistency of the two parameters and provide reference for the design of LCL filter.