Enhancement of power quality utilizing photovoltaic fed D-STATCOM based on zig-zag transformer and fuzzy controller

Distribution Static Synchronous Compensator (D-STATCOM) is a shunt compensator in the distribution systems that aims, as one of the most important tasks, to improve the imbalance and reduce and eliminate the nonlinear load harmonics. Distributed generation resources, such as photovoltaic (PV) array, can be used as the DC input of D-STATCOM. In this paper, PV array and DC/DC boost convertor are used to stabilize the DC link voltage of D-STATCOM. The main advantage of the proposed method is that it always provides continuous compensation. Another power quality issue is the neutral current in four-wire systems created due to the harmonics and system imbalance. Zigzag transformer is one approach to compensating neutral current and providing isolation between the convertor and flow of the fundamental zero-sequence component, which contains harmonic neutral current. Role and performance of the distribution shunt compensator in the improvement of power quality indices depends on the performance of its control system. In this paper, the control scheme of synchronous reference frame theory based on fuzzy controller is used for D-STATCOM based on PV and zig-zag transformer. The performance and behavior of the proposed system are examined using MATLAB/Simulink software and the results are presented. (C) 2022 Sharif University of Technology. All rights reserved.