柔性互联配电网探测式相间距离保护  

Detective Phase-to-phase Distance Protection for Flexibly Interconnected Distribution Network

作　　者：徐瑞东 常仲学 杨佳怡 王晨清 袁宇波 宋国兵[1] XU Ruidong;CHANG Zhongxue;YANG Jiayi;WANG Chenqing;YUAN Yubo;SONG Guobing(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,China)

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]国网江苏省电力有限公司电力科学研究院,江苏省南京市211103

出　　处：《电力系统自动化》2025年第5期48-56,共9页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2023YFB2407404)。

摘　　要：在基于智能软开关(SOP)的柔性互联配电网中,受到电力电子设备弱馈性和非线性调控特性的影响,电流保护的灵敏性和可靠性无法满足要求。为此,基于探测式保护思想,利用SOP向故障侧注入双频探测信号,建立了由SOP注入信号激励下的单电源系统,进而提出了包含故障距离、过渡电阻和对端系统参数在内的故障距离求解方程。基于故障距离整定动作延时,以反时限动作策略实现配合,设计了柔性互联配电网探测式相间距离保护方案。基于PSCAD开展了仿真验证,并开发了保护装置样机。仿真和硬件在环测试结果证明了所提方案的有效性。相比于传统保护原理,提出的保护方案不受弱馈特性的影响,且克服了经过渡电阻故障时对端系统和分支线引发的电流助增及外汲效应的影响。In the flexibly interconnected distribution network based on soft open point(SOP),the sensitivity and reliability of overcurrent protection cannot meet the requirements due to the characteristics of weak infeed and nonlinear regulation of power electronic equipment.Therefore,based on the idea of detective protection,a single power supply system excited by the dualfrequency detection signals injected by SOP is established,and the fault distance solution equation including fault distance,transition resistance and parameters of the opposite-end system is proposed.A detective phase-to-phase distance protection for flexibly interconnected distribution network is designed by setting the operation delay based on the fault distance and implementing coordination with the inverse time operation strategy.Simulation verification is carried out based on PSCAD,and the protection device prototype is developed.The simulation and hardware-in-the-loop test results prove the effectiveness of the proposed scheme.Compared with the traditional protection principle,the proposed protection scheme is not affected by the characteristic of weak infeed and overcomes the effects of current infeed and draining caused by the opposite-end system and branch lines during the fault through the transition resistance.

关 键 词：柔性互联配电网 智能软开关 短路 双频信号注入 距离保护 反时限 

分 类 号：TM7[电气工程—电力系统及自动化]