UPQC using eight switch power converter for power quality enhancement and voltage sag alleviation

Aim of this paper is to reduce the cost of power quality converter. There are several types of converter used to control or enhance the power quality i.e., twelve switch, Nine switch power conditioner. Nine switch converter incorporates less number of switches as compare to twelve switches of back-back converter. But due to its complicated controlling strategies several limitations in the entire achievable amplitude at its output depending on the phase shift between its two sets of terminal. But with improvement in the appropriate design control scheme for nine switch converter it reflects improvement of total power quality and justify its part as a power conditioner with reduced cost of semiconductor. The proposed power conditioner introduces only eight-switche, hybrid filter, four switch two leg inverter and six switch dynamic voltage restorer. It is capable of controlling voltage sag and also other unit for compensation of current harmonics.