Devvelopment oof High Effiiciency and Middle-Caapacity Uninnterruptible Power Systtems

Abstract

This paper provides the high efficienncy middle-ca pacity Uninteerruptible Powwer System (UUPS) design and test results. This U PS is a doub le conversionn type UPS annd it has a trransformer-lesss design for three-phase three-wire lloads. Capacitty range of th is UPS is 100 0-225kVA and it achieves hiigh efficiency y 97.0% with bbidirectional switch neuttral point clammp topology ffor low voltagge. In additionn, UPS size is one of the smmallest in midddle-capacity UPS categoory. This midddle-capacity UPS can be built a parallel redundant UPS system. It provides hhigh quality power suppply and reliabiility.