Journal of Applied Research in Electrical Engineering

Journal of Applied Research in Electrical Engineering

Efficient Responding to Demand and Robust Voltage Control of an Islanded DC Microgrid Under Variations in Load and Supply

Document Type : Research article

Authors
Sajed Derakhshani Pour 1, 2
Reza Eslami 2
1 Department of Energy, Polytechnic University of Milan, Milan, Italy
2 Department of Electrical Engineering, Sahand University of Technology, Tabriz, Iran
10.22055/jaree.2024.45776.1100
Abstract
In the last few years, there has been growing attention to isolated DC microgrids (MGs) with robust voltage control and efficient responding to demand in the face of fluctuating demands and supply amounts. This attention is due to significant voltage mismatches originating from the sudden transitions of the load demand and the active power of the supplies, such as photovoltaic (PV) systems. To address these goals, a novel nonlinear robust voltage control strategy with a cascaded design consisting of proportional-integral (PI) and sliding mode control (SMC) techniques is developed in this research for the battery energy storage system (BESS). Additionally, this research considers a fuel cell as another power supply in addition to a solar PV system. For maximum power point tracking (MPPT) of the PV system, a novel backstepping sliding mode control (BSMC) technique is developed as well. The effective functioning of the suggested cascaded control strategy is examined using MATLAB/Simulink. The outcomes of the simulation represent the effectiveness of the proposed approach in robustly regulating the voltage level of the DC link at 50 V with small deviations in tracking, and quick reaction to fluctuations in both demand and supply sides, as well as guaranteeing an even distribution of responses to demand fluctuations from the DC MG.

Highlights

  • Robust nonlinear voltage control in DC microgrids using novel cascaded PI-SMC algorithm.
  • Efficient and evenly-distributed responding to fluctuating demand and supply with BESS.
  • Novel BSMC technique for maximum power point tracking (MPPT) in PV systems.
  • Ensuring stability, less voltage fluctuations, and rapid response to variations.
  • Simplified control approach for effective DC link voltage regulation under various scenarios.

Keywords
DC microgrid
Cascaded robust voltage control
Maximum power point tracking
Battery energy storage system
Backstepping sliding mode control
Renewable energy sources
Subjects
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Journal of Applied Research in Electrical Engineering
Volume 3, Issue 1
Winter and Spring 2024
January 2024
Pages 51-63

  • Receive Date 08 January 2024
  • Revise Date 29 March 2024
  • Accept Date 18 April 2024