电力工程技术2025，Vol.44Issue(4)：14-22,9.DOI:10.12158/j.2096-3203.2025.04.002
典型接地故障检测方法在非隔离型柔性互联配电网中的适应性分析
Adaptability analysis of typical grounding fault detection methods in non-isolated flexible interconnected distribution networks
摘要
Abstract
Non-isolated flexible interconnected distribution networks as the research object are explored,focusing on the adaptability issue of typical grounding fault detection methods when single-phase grounding faults occur in AC systems due to zero-sequence transfer characteristics.Firstly,The zero-sequence equivalent topology network for non-isolated soft open point(SOP)is established,with transmission equations for zero-sequence components proposed to quantitatively analyzed their magnitude when transmitted to the non-fault side.The suppression effects of zero-sequence components are evaluated in various scenarios.Then,an adaptability analysis of typical protections is conducted for interconnected systems with low-current,low-resistance connections and hybrid low-current/low-resistance grounding methods.Results show that in non-isolated flexible interconnected systems,zero-sequence components transmission to the healthy side may cause protection maloperation or false alarms.Finally,a typical non-isolated flexible interconnected distribution network model is established in PSCAD to verify the adaptability analysis of protections in different interconnected systems,and the theoretical analysis is confirmed to be correct.The findings provide a theoretical basis for protection configuration in non-isolated flexible interconnected distribution networks.关键词
非隔离型柔性互联系统/智能软开关(SOP)/单相接地故障/小电流系统/小电阻系统/零序分量传递特性/零序抑制策略Key words
non-isolated flexible interconnected systems/soft open point(SOP)/single-phase grounding fault/low-current system/low-resistance system/zero-sequence transfer characteristic/zero-sequence suppression strategy分类
信息技术与安全科学引用本文复制引用
张贺铭,常仲学,陈实,王晨清,袁宇波,宋国兵..典型接地故障检测方法在非隔离型柔性互联配电网中的适应性分析[J].电力工程技术,2025,44(4):14-22,9.基金项目
国家重点研发计划资助项目(2023YFB2407400) （2023YFB2407400）
