Power quality assessment of microgrid using fuzzy controller aided modified SRF based designed SAPF

摘要

Microgrid (MG), a localized modular power system comprising of distribution generations (DGs) and loads, acts as a single controllable unit in relation to grid. It may either operate in standalone mode or grid connected mode. It offers benefits like efficient and sustainable energy supply, reduced carbon emission, deferring extension of power distribution infrastructures, and so on. However, integration of DGs having different characteristics results in various operational challenges in a MG network. One of which is power quality (PQ) issue. Hence, in this article, impact of PQ issues in an adopted standalone MG system (comprising of solar, wind and fuel cell based DGs) is investigated in the presence of shunt active power filter (SAPF). The realization of SAPF is carried out using conventional synchronous reference frame (SRF) and modified SRF (MSRF) techniques for reference current generation, proportional integral (PI) controller, and fuzzy logic controller (FLC) for DC-link capacitor voltage regulation and a basic hysteresis band current controller technique for generation of switching pulse for the inverter. The simulation model of conventional SRF/MSRF techniques and the proposed FLC approach based SAPF is developed under MATLAB/SIMULINK (R) environment both at ideal and nonideal source condition considering inductive and capacitive load. The results obtained using proposed MSRF technique and FLC approach owing to different load scenarios is compared to that of conventional SRF and MSRF technique with PI controller. The comparative results obtained validate the superiority of proposed technique over other related to harmonics elimination and DC-link capacitor voltage regulation.