摘要：本文通過對大容量工頻UPS和高頻UPS進行原理分析、拓撲對比、實測數據分析和性能對比，全面總結了大功率UPS工頻機和高頻機的優缺點和選配原則。 敘詞：UPS工頻機 高頻機 IGBT Abstract：This article compares the high power working-frequency UPS and high-frequency UPS from several aspects such as principle analysis, topology, measured data, and their performance, etc.. By so doing, the author summarizes the advantages and disadvantages of the two machines, and suggests standards for selection of the two.　 Keyword：the high power working-frequency UPS, high-frequency UPS, IGBT