Flexible fusion arc extinction method for single-phase earth fault of power distribution network

• Main Authors: GAO WEI, ZHENG ZEYIN, HONG CUI, GUO MOUFA, YOU JIANZHANG, YANG GENGJIE
• Format: Patent
• Language: Chinese; English
• Published: 18.02.2022
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The invention provides a power distribution network single-phase earth fault flexible fusion arc extinction method, and the method adopts a cascaded H-bridge converter as a flexible fusion arc extinction device, and simultaneously takes fault point current and fault point voltage as control targets based on a current and voltage double closed-loop controller. The fusion arc extinguishing method does not need complex switching conditions, the two arc extinguishing methods are simultaneously realized on one set of flexible arc extinguishing device, and compared with an arc extinguishing method in which an arc extinguishing coil and an arc extinguishing cabinet are cooperatively used, the fusion arc extinguishing method has the advantages that equipment investment and cooperation among different devices are saved. The method is not only suitable for a neutral point ungrounded system, but also suitable for a neutral point grounded system through an arc suppression coil, is slightly influenced by transient current