Development of a high performance single-phase voltage regulator composed of 3 arms bridge

Abstract

Regulation of load voltage in single-phase application is becoming an important issue for critical loads. This paper presents a novel high performance single-phase voltage regulator which has a common arm between the AC/DC and DC/AC power converters and adopts an appropriate switching strategy. As a result, the proposed voltage regulator can reduce the number of switching devices and system loss, while maintaining the capabilities of power factor correction and good output voltage regulation. In addition, novel low-cost AC capacitor using two DC capacitors is also presented. Therefore, the whole voltage regulator system can be more compact, simpler and less expensive than conventional designs. The fully digital controller is designed using a high-speed DSP, and the proposed system is validated through experimental results.