By digital adjustment with high precision on the DC bias of reference sine wave, the DC bias contained in inverter output voltage can be adjusted to restrain DC circulating current.

通过对逆变器基准正弦波直流分量的高精度数字调节，相应调节逆变器输出电压直流分量以抑制直流环流。

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This paper focuses on the parallel system of High-frequency UPS, including analyzing of the circulating current characteristics, parallel control, bypass switching strategy, protection and monitor.

本文以高频ups的并联系统为研究对象，研究分析了高频ups并联系统中的环流特性、并联控制、切换保护和系统监控等内容。

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