电力电子变压器的并网电流谐波抑制策略

Grid-connected Current Harmonic Suppression Strategy for Power Electronics Transformer

这里提出一种改进的3次谐波补偿策略,用于抑制电力电子变压器(PET)并网电流谐波。所提策略将PET并网电流中的基波电流和谐波电流进行分离,通过增加谐波电流环,将谐波电流反馈到系统中,达到消除并网电流中谐波成分的目的。所提控制策略并未改变原有的PET控制策略,易于实现。最后基于Matlab仿真和实验平台对所提控制策略进行了验证,结果表明所提控制方法能够有效降低PET并网电流畸变率。

An improved 3rd harmonic compensation strategy is proposed to suppress the PET grid-connected current harmonic.The proposed strategy separates the fundamental current and harmonic current in the PET grid-connected current,by adding a harmonic current loop,the harmonic current is fedback to the system to achieve the purpose of eliminating harmonic components in grid-connected current.The proposed control strategy does not change the original PET control strategy and is easy to implement.Finally,the proposed control strategy is verified based on Matlab simulation and experimental platform.The results show that the proposed control method can effectively reduce the distortion rate of PET grid-connected current.