Unified Power Quality Conditioner: A Review

During Last decade power quality problems has become more complex at all level of power system. Recently, the Power electronics controllers are gaining concern to provide the quality of power for both power suppliers and consumers. Various power filtering technology i.e. passive filters, active power filters, hybrid filters have applied from time to time for giving the solution of power quality problems to users, But could not fully satisfied them. Now day's a new concept of custom power is used for customers’ satisfaction. The aim of a unified power quality conditioner (UPQC) that consists of series active and shunt active filters is to compensate for supply voltage flicker/imbalance, reactive power, negative sequence current and harmonics.