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Frequency control enhancement for hybrid microgrid using multi-terminal multi-function inverter

1National Research Institute of Astronomy and Geophysics (NRIAG), Astronomy Department, Cairo, 11421, Egypt

2Faculty of Engineering, Helwan University, Department of Electrical Power and Machines Engineering, Cairo, 11792, Egypt

3College of Engineering, Prince Sattam Bin Abdulaziz University, Department of Electrical Engineering, Al-Kharj, 11942, Saudi Arabia

Received: 26 Feb 2024; Revised: 17 Apr 2024; Accepted: 12 May 2024; Available online: 15 May 2024; Published: 1 Jul 2024.
Editor(s): H Hadiyanto
Open Access Copyright (c) 2024 The Author(s). Published by Centre of Biomass and Renewable Energy (CBIORE)
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Abstract

Renewable energy sources (RESs) are considered a crucial energy transformation to reduce carbon emissions, so more RESs are being integrated into contemporary power systems. Power electronic converters are extensively utilized to connect power grids with renewable generators to manage the fluctuations and unpredictability of these renewable energy sources. This paper introduces a multi-terminal multi-function inverter (MT-MF) designed for a battery energy storage system (BESS) to maintain the frequency stability of a hybrid microgrid (MG). The MG comprises a photovoltaic generation system, a diesel generator, BESS, and two loads: one constant load and the other variable, fed through a medium-voltage radial feeding system. An introduced approach involves utilizing a model predictive control controlled virtual synchronous generator (MPC-VSG) for BESS. This method offers inertia support during transient states and improves the dynamic characteristics of system frequency. In addition, it enables the connection of multiple batteries, provides individualized control for each, and supports the injection of reactive power into the MG. The required power from the BESS is shared between the two batteries using the low pass filter technique. The simulation outcomes affirm the proposed control strategy’s effectiveness and underscore the MT-MF inverter approach’s potential in integrating extensive RESs. This paper also explores how the proposed technique outperforms other methods in improving frequency stability.

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Keywords: Frequency Stability; Microgrids; Photovoltaic generation; renewable energy; Virtual Synchronous Generator; storage Battery; Grid Integration; nonlinear controller

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