有源配电网小电流接地故障暂态特征及其影响分析  

Transient Characteristics and Influence of Small Current Grounding Faults in Active Distribution Network

作　　者：秦苏亚 薛永端[1] 刘砾钲 郭雨豪 徐铭铭 Qin Suya;Xue Yongduan;Liu Lizheng;Guo Yuhao;Xu Mingming(New Energy College China University of Petroleum(East China)Qingdao 266580,China;Nanning Power Supply Bureau of Guangxi Power Grid Co.Ltd.Nanning 530031,China;Electric Power Research Institute of State Grid Henan Electric Power Company Zhengzhou 450052,China)

机构地区：[1]中国石油大学(华东)新能源学院电气工程系,青岛266580 [2]广西电网有限责任公司南宁供电局,南宁530031 [3]国网河南省电力公司电力科学研究院,郑州450052

出　　处：《电工技术学报》2022年第3期655-666,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(52077221);国家电网总部科技项目(SGHADK00PJJS1900078)资助。

摘　　要：随着“双高(高比例清洁能源、高比例电力电子装置)电网”的普及,逆变型与旋转型分布式电源(DG)接入配电网的渗透率越来越高,其对小电流接地故障暂态特征及暂态检测的影响尚需进一步明确。该文建立了有源配电网接地故障等效电路,研究了不同DG类型(旋转型、逆变型)、接入位置及接入数量时接地故障暂态特征的变化规律,并分析其对暂态选线/定位原理与装置性能的影响。结果表明,由于DG接入不改变故障零模网络,现有利用暂态零模信号的选线与定位方法在原理上仍能适用;旋转型DG将使故障暂态电流的主谐振频率及幅值增大,衰减时间分布范围扩大,相应地,接地故障检测装置的采样频率与电流测量范围应适度增加。仿真验证了该文结果的正确性。With the popularization of"double high(high proportion of clean energy,high proportion of power electronic devices)power grid".The penetration rate,of inverter-type and rotating distributed power supplies(DG)into the distribution network,is getting higher.Its influence on the transient characteristics and transient detection of single-phase grounding faults need to be further clarified.In this paper,the grounding fault equivalent circuit of active distribution network is established.The variation law,of grounding fault transient characteristics under different DG types as well as different access locations and access numbers is studied.Its impact on the device performance and the principle of transient line selection and location method is analyzed.The results show that since the access of DG does not change the faulty zero-mode network,the existing line selection and location method using the transient zero-mode signal can still be applied in principle.The access of rotating DG will increase the main resonant frequency and amplitude of the fault transient current,and expands the distribution range of attenuation time.Correspondingly,the sampling frequency and current measurement range of the grounding fault detecting device should be moderately increased.Simulation and field fault data verify the correctness of the results.

关 键 词：有源配电网 分布式电源 小电流接地故障 暂态特征 暂态选线 暂态定位 

分 类 号：TM713[电气工程—电力系统及自动化]