Meanwhile, in the main circuit structure, the use of LCL filter, improved high frequency switching harmonics suppression.

同时，在主电路结构中，采用LCL滤波，改善了对高频开关谐波的抑制。

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To avoid the current resonance caused by LCL filter, damping resistance is usually needed, which increases wastage and reduces system efficiency.

为了避免LCL滤波器发生电流谐振，通常需要加入阻尼电阻，则导致损耗增加，降低系统效率。

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To suppress resonance of LCL filter and improve stability of system, it is pre - sent that a voltage and current double loops control strategy based on virtual resistor concept.

为了提高系统的稳定性，抑制滤波器的谐振，在双闭环控制的基础上提出了一种基于虚拟电阻思想的控制策略。通过对滤波电容电流的积分处理，改变了系统传递函数的极点，确保了系统的稳定运行。

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