基于双比例补偿系数的有源配电网电流差动保护  

Differential current protection for active distribution networks with dual proportional compensation coefficients

作　　者：吴振杰 胡晨 陈海燕 金楷 唐爱红[2] 王潜 马伟 WU Zhenjie;HU Chen;CHEN Haiyan;JIN Kai;TANG Aihong;WANG Qian;MA Wei(State Grid Hangzhou Power Supply Company,Hangzhou 310016,China;School of Automation,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]国网浙江省电力有限公司杭州供电公司,杭州310016 [2]武汉理工大学自动化学院,武汉430070

出　　处：《浙江电力》2024年第12期104-113,共10页Zhejiang Electric Power

基　　金：湖北省重点研发计划项目(2023BAB111);国网浙江省电力有限公司科技项目(B311HZ23000P)。

摘　　要：分布式电源在配电网中的渗透率不断提升,常规电流差动保护存在适应性不足的问题。为此,对不同类型的分布式电源在故障时刻输出的正序电流分量进行分析,提出了一种基于双比例补偿系数的有源配电网电流差动保护方案。该方案构建了制动系数及故障电流相量的补偿系数,通过补偿调整两侧正序电流故障分量的相位和幅值,使得区内故障时正序电流故障分量更容易向幅相平面的动作区域移动,而区外故障时可靠不动作。最后,通过在PSCAD/EMTDC仿真软件上搭建有源配电网模型测试所提保护方案在不同故障情况下的有效性,仿真实验结果表明所提保护方案提高了电流差动保护的灵敏性与可靠性。The increasing penetration of distributed generation(DG)in distribution networks has exposed poor adaptation of conventional differential current protection schemes.To address this issue,an analysis of the positive-sequence current components output by various types of DGs during faults is conducted.A differential current protection scheme for active distribution networks with dual proportional compensation coefficients is proposed.The scheme constructs braking coefficients and compensation coefficients for fault current phasors,adjusting the phase and magnitude of the positive-sequence current fault components on both sides.This adjustment helps the positive-sequence current components move more easily into the action region of the amplitude-phase plane during internal faults,while ensuring reliable non-operation during external faults.Finally,the proposed protection scheme’s effectiveness under different fault conditions is tested using a model of an active distribution network established in PSCAD/EMTDC.The simulation results demonstrate that the proposed scheme improves both the sensitivity and reliability of differential current protection.

关 键 词：有源配电网 分布式电源 差动保护 幅相关系 电流幅值比 电流相位差 双比例补偿系数 

分 类 号：TM773[电气工程—电力系统及自动化]