A new SRF-based power angle control method for UPQC-DG to integrate solar PV into grid

Abstract

Summary In this paper, a new synchronous reference frame theory–based power angle control (PAC) method for unified power quality conditioner with distributed generation (UPQCDG) is proposed for effective grid integration of solar PV. In UPQCDG, shunt active power filter (APF) feeds power from distributed generator to load, apart from supplying reactive power demand, which leads to increase in VA burden, hence its rating. Power angle control method aims at effective utilization of series and shunt APFs through sharing of reactive power to reduce VA burden on shunt APF. Proposed PAC method is based on instantaneous three‐phase power estimation technique, which is simple and robust and utilizes already available measurements of UPQCDG. Performance of proposed system is tested in the presence of nonlinear and reactive loads with solar PV generation system. Dynamic performance of system is studied during grid disturbances such as voltage sag and swell, solar irradiation variation, and change in load. Effectiveness of proposed method is validated using real‐time simulation performed in Opal‐RT, in which electrical circuit of UPQCDG is simulated on FPGA computation engine with submicrosecond time step to emulate real hardware closely.

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