Power Regulation Strategy of Grid-Forming Bidirectional Interlinking Converters in Hybrid AC-DC Microgrid With Energy Storage Management
This study proposes a power regulation strategy for a bidirectional interlinking converter (BIC) in a hybrid AC/DC microgrid. The proposed control strategy utilizes grid forming virtual synchronous generator (VSG) control of BIC to achieve global power sharing (GPS) between two sub-grids, AC and DC...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2025-01-01
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| Series: | IEEE Access |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10896672/ |
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| Summary: | This study proposes a power regulation strategy for a bidirectional interlinking converter (BIC) in a hybrid AC/DC microgrid. The proposed control strategy utilizes grid forming virtual synchronous generator (VSG) control of BIC to achieve global power sharing (GPS) between two sub-grids, AC and DC sub-grids, in islanded mode. Both grid-connected mode and islanded mode are incorporated in the system. This approach allows BIC to operate under a voltage source fault in the AC subgrid. The control strategy includes both communication-based and communication-less approaches to handle communication equipment failures. In the DC-side, a droop shift control strategy is proposed, taking into account the energy storage system (ESS) and its management with the virtual output power method. Simultaneously, the droop shift control can increase the load response in the DC side of BIC. During periods of low load demand, the ESS can be charged, and the overall power sharing on the AC and DC sides can be achieved. In addition, this study combines virtual impedance and frequency restoration control of BIC to enhance active and reactive power sharing. Furthermore, the system stability is analyzed. Finally, the feasibility of the proposed method is verified through simulations and prototype experimental results. |
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| ISSN: | 2169-3536 |