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Improving Current Sharing and Voltage Regulation in DC Microgrids Based on Hybrid Energy Storage
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Peyman Tabakhnejad   , Alireza Tavakoli * , Mehdi Forouzanfar |
| Department of Electrical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran |
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Abstract: (59 Views) |
In modern power grid structure, solar power generation has grown extensively. Due to the output fluctuations and the inability to store energy, the power provided by RESs is variable; Therefore, using energy storage devices along with them is inevitable. Energy storage devices used for power management in systems based on renewable energy sources. In this paper, an off-grid DC system including photovoltaic unit and hybrid battery-supercapacitor energy storage was studied. Each of units is connected to the DC link through DC-DC converters. In such a system, it is essential to use a suitable control strategy in order to maintain the power balance between the photovoltaic, energy storages and load demand. For this purpose, a new control strategy for energy management and maintaining power balance in DC link is presented in this paper, which controls voltage fluctuations caused by load and source changes, using the high accuracy of delta sigma modulators. The effectiveness of the proposed strategy is validated through simulation under five different scenarios, taking into account all possible modes of changes, including stepwise increase or decrease in load or resource production. The results indicate the better performance of the proposed method in terms of maximum range of oscillation in all investigated modes. |
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| Keywords: Renewable energy, photovoltaic system, battery-supercapacitor hybrid energy storage, energy management system, delta-sigma modulator. |
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Full-Text [PDF 1643 kb]
(36 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2024/03/24 | Accepted: 2024/05/30 | Published: 2024/05/30
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