Abstract
Owing to the smart lifestyle, environmental consciousness, and dwindling fossil fuel supplies, there is a huge demand for clean and green energy. Microgrid (MG) is a crucial approach to renewable and clean energy. Because of the success of the AC utility grid and the growing demand for critical loads, it is very convenient to provide AC/DC MG that can easily satisfy both the alternating current (AC) MG and the direct current (DC) MG requirements. Due to uncertainty in load variations, main grid failures, intermittent power generations from renewable energy sources (RESs), the synchronization and interconnection of different power converters are the paramount issues in the control of AC/DC MG. This article presents an overview-oriented state of the art in the recent advancement in control strategies of AC/DC MG and its associated power converters control. Based on recent research, this article summarizes unobstructed views on different topologies, types of power converters, power converter controls, and control strategies of AC/DC MG. Finally, it identified some future challenges that need to be addressed in order to develop a sustainable and reliable control strategy for AC/DC MG. This article will serve as a guide for researchers.
Highlights
INTRODUCTION MGs compromise different renewable energy sources (RESs), i.e., PV cells, windmills, energy-storing systems (ESS), diesel generator sets, and small hydropower plants, as discussed in the [1], [2]
Literature [105] extended the hierarchical control strategy to switch the power converters fed to the Distributed energy resource (DER) in voltage source inverter (VSI) or current source inverter (CSI) mode according to the requirement in the Bus-bar before and after the contingency conditions in the alternating current (AC) MG
CHALLENGES In this article, we presented an overview oriented stateof-the-art on the power converters control, and Control strategies of AC/direct current (DC) MG
Summary
Gs compromise different RESs, i.e., PV cells, windmills, energy-storing systems (ESS), diesel generator sets, and small hydropower plants, as discussed in the [1], [2]. There is no master-slave relation among these nanogrids, and these are controlled in a decentralized manner These nanogrids operate on the droop control method to provide support of voltage and frequency to the MG bus-bar and regulate the output power based on local information. Where the primary control performed by adopting conventional droop control responsible for regulating voltage and frequency while the secondary control took a centralized extended optimal power flow (EOPF) control accountable for the management of active and reactive power sharing among the DGs. Literature [105] extended the hierarchical control strategy to switch the power converters fed to the DERs in VSI or CSI mode according to the requirement in the Bus-bar before and after the contingency conditions in the AC MG.
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