对于大容量的变频器，可以在变频器的输入端装设的电源输入变压器，将电源侧变流器分为2个，利用该变压器使输入电流的相位错开，以多重化来抑制变频器向电源侧的高次谐波。 安装电抗器实际是从外部增加变频器供电电源的阻抗，在变频器的交流侧或直流侧安装电抗器或同时安装，可以抑制谐波电流。采用交流/直流电抗器后，进线电流的（电压畸变率）大约降低30%～50%，是不加电抗器谐波电流的1/2左右。
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