Performance of SRF-UVTG based UPQCDG for integration of solar PV with non-linear loads

Abstract

This paper proposes a simple control technique of Unified Power Quality Conditioner with Distributed Generation (UPQC DG ) for grid integration of solar photovoltaic (PV) system. In proposed technique shunt Active Power Filter (APF) of UPQC DG is controlled using Synchronous Reference Frame (SRF) theory and series APF is controlled using Unit Vector Template Generation (UVTG) method. Proposed control technique utilizes only one PI controller and incorporates directly measured PV array current without estimating power generated by PV array. Performance of proposed system is validated in the presence of non-linear load. System performance is also studied during grid disturbances such as voltage sag, change in load and solar irradiation variation. Simulation carried out in MATLAB/Simulink validates system performance.