Fault suppression strategy of active compensators in asymmetric distribution networks
The new-type distribution network with a high penetration of distributed generation (DG) faces challenges such as significant power fluctuations and the inability to fully compensate for single-phase grounding fault currents. The active compensator, utilizing power electronic conversion technology,...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | International Journal of Electrical Power & Energy Systems |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S014206152500482X |
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| Summary: | The new-type distribution network with a high penetration of distributed generation (DG) faces challenges such as significant power fluctuations and the inability to fully compensate for single-phase grounding fault currents. The active compensator, utilizing power electronic conversion technology, can simultaneously achieve power compensation and full compensation of grounding fault currents. However, its compensation performance is affected by three-phase asymmetrical voltage, and the cost of active compensators is relatively high. Therefore, this paper proposes a fault suppression strategy that considers the impact of asymmetrical voltage and is suitable for active compensators. Firstly, a star-connected three-phase four-leg cascaded H-bridge active compensator topology is proposed to achieve active compensation, grounding fault suppression, and asymmetrical voltage mitigation while reducing costs. Meanwhile, the impact of three-phase asymmetrical voltage on the performance of active compensation is analysed. And a voltage-current composite control-based asymmetrical voltage suppression strategy is proposed. This strategy enables seamless switching between asymmetrical voltage suppression and grounding fault current compensation without transient impact. Finally, physical experiments verify the effectiveness of the proposed topology and fault suppression strategy, demonstrating excellent compensation performance and economic feasibility. |
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| ISSN: | 0142-0615 |