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作 者:欧阳剑 白浩 杨海军 杨乾 刘红文 叶升言 OUYANG Jian;BAI Hao;YANG Haijun;YANG Qian;LIU Hongwen;YE Shengyan(Qujing Power Supply Bureau of Yunnan Power Grid Co.,Ltd.,Qujing,Yunnan 655099,China;Electric Power Research Institute,CSG,Guangzhou 510663,China;Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650032,China)
机构地区:[1]云南电网有限责任公司曲靖供电局,云南曲靖655099 [2]南方电网科学研究院,广州510663 [3]云南电网有限责任公司电力科学研究院,昆明650032
出 处:《南方电网技术》2024年第10期107-115,共9页Southern Power System Technology
基 金:国家重点研发计划资助项目(2017YFB0902902);中国南方电网有限责任公司科技项目(YNKJXM20210175)
摘 要:针对传统配电网在单相接地故障(尤其是高阻接地故障)检测上受故障特征微弱影响,存在检测难度大的问题,从故障前后配电网系统功率会发生明显变化的角度出发,提出了一种基于功率因数角双端测量的中性点不接地配电网单相接地故障检测新方法。通过与中性点相连的两个电压互感器向中性点注入可控电流信号并测量返回电压信号,精准测量配电网此刻运行状态下的有功功率和无功功率,进而得到系统的功率因数角。结合配电网正常运行状态下的功率因数角,实时测算系统故障前后的功率因数角比值系数,基于比值系数与比值阈值系数的比较实现高阻接地故障的灵敏检测。双电压互感器的巧妙应用从原理上消除了互感器内阻抗和消谐电阻引起的测量误差,大幅提高了配电网高阻接地故障有效检测范围。在PSCAD/EMTDC仿真环境中搭建了10 kV中性点不接地配电网对所提方法进行验证,模拟不同类型的高阻接地故障来对所提方法进行验证,仿真结果表明该方法能够对高阻接地故障进行可靠检测,检测范围高达20 kΩ。In order to solve the problem that single-phase grounding fault detection(especially high-resistance grounding fault)in traditional distribution network is affected by weak fault characteristics and difficult to detect,this paper proposes a new detection method for single-phase grounding fault detection in eutral point ungrounded distribution network based on two-terminal measure⁃ment of power factor angle from the perspective that the power of distribution network system will change significantly before and after the fault.The two voltage transformers connected with the neutral point inject controllable current signals into the neutral point and measure the return voltage signals,so as to accurately measure the active and reactive power of the distribution network at the cur⁃rent operating state,and then obtain the power factor angle of the system.Combined with the power factor angle of the distribution network under normal operation,the ratio coefficient of power factor angle before and after the system failure is measured in real time.Based on the comparison between the ratio coefficient and the ratio threshold coefficient,the sensitive detection of high resistance grounding fault is realized.The smart application of dual voltage transformer eliminates the measurement error caused by internal resistance and detuning resistance of the transformer in principle and greatly improves the effective detection range of high resistance grounding fault in distribution network.The proposed method is verified by setting up a 10 kV neutral point ungrounded distribution network in the simulation environment of PSCAD/EMTDC.Different types of high resistance grounding faults are simulated to verify the proposed method.The simulation results show that the proposed method can detect high resistance grounding faults reliably,and the detection range is up to 20 kΩ.
关 键 词:双电压互感器 注入信号 单相接地故障 功率因数角 配电网
分 类 号:TM862[电气工程—高电压与绝缘技术]
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