Frequency Regulation of Isolated Hybrid Microgrids In the Presence of Uncertainties By Neuro-Fuzzy Based Controllers

Subject Areas : Power Smart Grid

Abbas  Aff ¹ (Ph.D. Student of Electrical Engineering, Marvdasht Branch, Islamic Azad University, Fars, Iran)
Mohsen  Simab ² (Assistant Professor, Department of Electrical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran)
Mehdi  Nafar ³ (Assistant Professor, Department of Electrical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran)
Seyed Alireza  Miirzaee ⁴ (Assistant Professor, Department of Electrical Engineering, Dariun Branch, Islamic Azad University, Shiraz, Iran)

Received: 2022-11-11 Accepted : 2023-01-09 Published : 2023-06-22

Keywords: Parametric uncertainties, Isolated microgrid, Neuro-fuzzy, Frequency Regulation,

Abstract :

The capability of a neuro-fuzzy control approach for frequency fluctuation damping in an isolated hybrid microgrid (IHMG) system (DEG/WTG /PV/FC/ESSs) is investigated in this paper. Due to the intermittent behavior of renewable energy sources (RESs) like wind turbines and photovoltaic arrays and the time-varying nature of demands, frequency fluctuation is more likely, specifically in the grid-connected mode. Model parametric uncertainties as well as load changes, wind power, and solar irradiation variations are the main uncertainty sources of the IHMG system. In the suggested approach, a neuro-fuzzy output feedback controller with three inputs that are inspired by PID control is designed considering the power balance between demands and generations, by optimizing fuzzy membership functions’ locations. The proposed controller is compared with two popular other methods on the investigated IHMG system in terms of time-domain characteristics. The outcome illustrates remarkable merit compared to the state-of-the-art methods in the presence of simultaneous disturbances and the model parametric uncertainties.

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