A Dual Second-Order SOGI based Control Algorithm for UPQC under Distorted Grid and Load Conditions

This paper presents a Second-Order Second Order Generalized Integrator (SO-SOGI) based control algorithm for UPQC (Unified Power Quality Conditioner), an integration of DVR and DSTATCOM. This paper mainly aims to mitigate source voltage and load current harmonics, unbalance and power factor improvement. In this paper, SO-SOGI-PLL (Phase-Locked Loop) is employed for UPQC to generate reference voltage and current signals for enhancing power quality at the utility mains. SO-SOGI based PLL is utilized for power quality enhancement because of its dynamic response, better harmonic and inter harmonic compensation, tracking accuracy and faster detection of reference signal under all varying load and grid conditions. The proposed three-phase UPQC is utilized for mitigation of voltage harmonics, current harmonics, sag and swell with a simple control technique. The control algorithm is tested and evaluated using MATLAB/Simulink.

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