基于谐波能量分布特征的新能源并网发电系统短时孤岛检测新方法  

A New Short-Time Island Detection Method for Renewable Energy Grid Connected Power Generation System Based on Harmonic Energy Distribution Characteristics

作　　者：张丹 万雄彪 何常胜 曾丕江 束洪春[3] 蒋晓涵 ZHANG Dan;WAN Xiongbiao;HE Changsheng;ZENG Pijiang;SHU Hongchun;JIANG Xiaohan(Yunnan Power Grid Company Limited,Kunming 650051,China;Yunnan Electric Power Experimental Research Institute(Group)Company Limited,Kunming 650214,China;Kunming University of Science and Technology Kunming,State Key Laboratory of Collaborative Innovation Center for Smart Grid Fault Detection Protection and Control Jointly,Kunming 650500,China)

机构地区：[1]云南电网有限责任公司,云南昆明650051 [2]云南电力试验研究院(集团)有限公司,云南昆明650214 [3]昆明理工大学省部共建智能电网故障检测与保护控制协同创新中心,云南昆明650500

出　　处：《昆明理工大学学报(自然科学版)》2025年第2期106-115,共10页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(52037003);中国南方电网有限责任公司重点科技项目(YNKJXM20220025).

摘　　要：针对传统被动式孤岛检测存在盲区和检测时间长,主动检测法存在影响供电质量的问题,提出了基于谐波能量分布特征的孤岛检测新方法.根据新能源和小水电并网点的电压谐波分量,计算谐波占基频分量的比值,在一定频率内对其进行积分,依据孤岛运行时谐波占比分布与正常运行下的谐波占比分布差异来检测孤岛发生与否;根据重合闸延时信号,判断局部电网是因线路瞬时故障跳闸形成的短时孤岛还是永久故障形成的孤岛,为提高孤岛检测的可靠性,当断路器闭合后,再根据线路首端电压的部分谐波信号能量与总谐波能量比例特征对短时孤岛和永久性孤岛进行识别.通过仿真验证了所提方法的准确性,且该方法克服了传统检测方法的弊端.For the problems of blind area and long detection time in passive islanding detection,and influence on power supply quality in active detection,an island detection new method based on harmonic component proportion and energy distribution characteristics is proposed.According to the voltage harmonic component of the junction point for renewable energy and small hydropower,the ratio of harmonic to fundamental frequency component is calculated and it is integrated within a certain frequency.The occurrence of island is detected according to the difference between the harmonic proportion distribution during island operation and the normal operation.According to the reclosing delay signal,it is determined whether the regional power grid is a short-time island formed by instantaneous fault tripping or an isolated network formed by permanent fault.At the same time,when the circuit breaker is closed,the short-time island and permanent island are identified according to the proportion characteristics of partial harmonic signal energy and total harmonic energy of the voltage at the head end of the line,so as to improve the reliability of island detection.The accuracy of the proposed method is verified by simulation,and the proposed method overcomes the disadvantages of traditional detection methods.

关 键 词：谐波分量 谐波能量分布 孤岛运行 短时孤岛 永久性孤岛 

分 类 号：TM73[电气工程—电力系统及自动化]