不平衡负载下三相 UPS 逆变器的研究 Research on Three-phase UPS with Unbalanced Load 要：三相电压的对称输出是衡量交流电源性能的一个重要指标。提出了一种新型的三相 UPS 逆变器系统，利用 Δ/Z0 型变 压器为三相不平衡负载造成的零序电流分量提供通路，再通过设计正、负序双 PI 控制器抑制不平衡负载中负序电压分量。从而 解决零序电压和负序电压造成的三相电压不平衡问题，使该三相 UPS 逆变电源系统可带三相不平衡负载。试制一台 60kVA 的三 相 UPS 样机，并给出实验结果。 关键词：三相 UPS 三相逆变器 不平衡负载 电压对称性
Abstract: The balanced output of three-phase voltage is an important index to measure the function of alternating current .In order to
obtain high-grade output voltage in the case where the load is out-off-balance, this paper analyzed the mechanism and result of threephase voltage caused by unbalanced load, and some existing solutions to solve this problem. A new three-phase UPS inverter system is
also raised which use △ /ZO transformer to provide a current path for zero-sequence current that caused by three-phase unbalanced load.
What’s more, it controlled the component of negative sequence voltage in the unbalanced load by designing the doubled PI controller (of
positive and negative sequence). In these ways it could solve the imbalance of three-phase voltage caused by Zero-sequence voltage and，
making the three-phase UPS inverter system able to load the three-phase unbalanced load. A 60kVA three-phase UPS prototypes was built
and the results were given based on the experiments.
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