Proposal of Voltage Transient Sag Compensator with Controlled Gradational Voltage

Abstract

This paper presents the new concept of voltage transient sag compensator and the experimental results of its 400V class compensator. This compensator is composed of the series connection of some inverter units with gradational output voltages. Because each output voltage is different by 2n times, an approximate sinusoidal voltage is generated by controlling operation of each inverter and compensates voltage sag of the power line. The new compensator can be directly installed in a power line without an insertion transformer and a large filter, and thus it is expected to be compact and economical system.