Development of Single-Phase DVR(Dynamic Voltage Restorer) Composed of H-Bridge Inverter and SuperCapacitor

H-브리지 인버터와 수퍼커패시터로 구성된 단상 DVR(Dynamic Voltage Restorer)의 개발

This paper describes the development of a single-phase DVR(Dynamic voltage Restorer), which is composed of H-bridge inverter and super-capacitors. The operational feasibility was verified through computer simulations with PSCAD/EMTDC software, and experimental works with 3kVA prototype. The developed system can compensates the input voltage sag and interruption within 2ms, in which the maximum allowable duration of voltage interruption is 1.5 seconds. It can be effectively used to compensate the voltage interruption in the sensitive load, such as computer, communication equipment, automation equipment, and medical equipment. The developed system has a simple structure to be easily implemented with commercially available components and to be highly reliable in operation.