基于同步挤压S变换的谐振接地系统单相接地故障区段定位方法  

A Location Method of the Single-Phase Grounding Fault Section for the Resonant Grounding System Based on Synchrosqueezing S-Transform

作　　者：权立 颜琬滢 王毅钊 侯泽权 蒋劲轩 QUAN Li;YAN Wanying;WANG Yizhao;HOU Zequan;JIANG Jinxuan(Power Research Institute of State Grid Shaanxi Electric Power Company Limited,Xi’an 710100,Shaanxi,China;Xi’an University of Technology,Xi’an 710054,Shaanxi,China)

机构地区：[1]国网陕西省电力有限公司电力科学研究院,陕西西安710100 [2]西安理工大学,陕西西安710054

出　　处：《电网与清洁能源》2024年第10期59-66,共8页Power System and Clean Energy

基　　金：国家自然科学基金项目(51877174);国网陕西省电力有限公司科技项目(5226KY-200079)。

摘　　要：谐振接地系统单相接地的故障特征微弱,故障区段难以定位。根据健全与故障区段电流低频能量差异大的特点,利用同步挤压S变换挤压、重组低频区段电流,增强故障特征辨识度;计算各区段能量比值,将能量比值最大的判为故障区段,提出基于同步挤压S变换的故障区段定位方法。以全频区段电流重组信号的峭度因子构建保护启动判据。不同故障条件影响下,大量PSCAD仿真测试了所提启动和区段定位方法的性能及可行性,现场数据验证了所提方法的有效性。As the fault characteristics in the single-phase resonant grounding system are weak,it is rather difficult to locate the fault section in this system.In the paper,first of all,according to the feature of a large difference of the low frequency energy between of the sound and fault sections,the synchrosqueezing s-transform is used to squeeze and recombine the low-frequency zero-sequence current to enhance the identification degree of the fault feature.Second,the energy ratio in each section is calculated with the section exhibiting the highest energy ratio being identified as the fault location.A fault section localization method based on the synchrosqueezing Stransform is thus proposed.Furthermore,the kurtosis factor of the zero-sequence current full-band recombined signal is utilized to build the protection initiation criterion.Finally,extensive PSCAD simulations under various fault conditions have been conducted to substantiate the proposed method's feasibility and efficacy.Field data further confirm the effectiveness of this novel approach.

关 键 词：谐振接地系统 故障区段定位 单相接地故障 同步挤压S变换 

分 类 号：TM77[电气工程—电力系统及自动化]