Comparison of Power Losses for Different Control Strategies of UPQC

Unified Power Quality Compensator (UPQC) is a combination of Dynamic voltage regulator (DVR) and Dynamic Static Compensator (DSTATCOM) for mitigation of most power quality issues. Since involving two APFs, various control strategies have been proposed to enhance their utilization. Most control strategies can be classified into three categories- UPQC-P, UPQC-Q, and UPQC-S. Existing literature provides enormous details on various merits and demerits of such methods, like reduction in converter VA ratings, voltage injection etc. Still, a detailed study on power losses of such control strategies needs attention. This paper presents a comparison of different control strategies of UPQC of three-phase system such as UPQC-P, UPQC-Q, UPQC-S in terms of their power consumption losses. Losses are estimated using computer simulations performed in MATLAB/Simulink under various operating conditions of UPQC.