A New Topology for Power Quality Improvement using 3-Phase 4-Wire UPQC with Reduced DC-Link Voltage Rating

This paper introduces a new concept of optimal utilization of a Unified power quality conditioner (UPQC). The series inverter of UPQC is controlled to perform simultaneous Methods: voltage sag/swell compensation and load reactive power sharing with the shunt inverter. The active power control approach is used to compensate voltage sag/swell and is integrated with theory of power angle control (PAC) of UPQC to coordinate the load reactive power between the two inverters. MATLAB/SIMULINK-based simulation results are discussed to support the developed concept. Finally, the proposed UPQC concept is validated.