It is found that the input current produces distortion even if the three-phase input voltages are balanced.
也发现即使三相输入电压平衡，输入电流也存在失真现象。
The electric power system entails enough reactive power to meet the needs of consumers and the network. To satisfy numerous node voltages, reactive power should be balanced locally and hierarchically.
电力系统的负荷需要消耗大量的无功功率，而无功功率平衡要满足众多的结点电压，就需要分级分层就地平衡。
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