A flexible compensation device for single-phase-to-ground fault in distribution networks based on double-loop passivity-based control

• Published in: International journal of electrical power & energy systems 2024-06, Vol.157, p.109788, Article 109788
• Main Authors: Guo, Mou-fa, Liu, Xin-bin, You, Jian-zhang, Zheng, Ze-yin, Wang, Zhi-ying
• Format: Article
• Language: English
• Subjects: Distribution networks; Double-loop passivity-based control; Flexible compensation; Single-phase-to-ground fault; T-type topology
• ISSN: 0142-0615
• DOI: 10.1016/j.ijepes.2024.109788

•The flexible compensation device is based on the cascaded H-bridge topology and applied to suppress the ground fault .•A double-loop passivity-based control method is proposed. Simulation and experiment verify the effectiveness of the method.•The current and voltage arc suppression method work in parallel, which enhances the compensation effect of the device. Aiming at the problem that the existing single-phase-to-ground fault flexible compensation device has low compensation accuracy, long response time, and needs DC side power supply, a flexible compensation device based on double-loop passivity-based control is proposed. Firstly, the topology and working principle of the device are analyzed. And a compensation current distribution method of the bridge arm is proposed. Secondly, a double-loop passivity-based controller is designed. Finally, the proposed method is verified by MATLAB/Simulink software and 10 kV physical simulation system of distribution network. The comparisons between double-loop passivity-based control, passivity-based control, and proportional integration control is discussed. The result shows that the proposed method can accurately and rapidly compensate the fault current.