基于馈线功率的配电网对地参数测量与接地故障灵敏感知新方法

doi:10.3969/j.issn.1008-0198.2023.01.009

湖南电力 ›› 2023, Vol. 43 ›› Issue (1): 50-57.doi: 10.3969/j.issn.1008-0198.2023.01.009

基于馈线功率的配电网对地参数测量与接地故障灵敏感知新方法

贺世庚¹, 杨理斌¹, 喻锟¹, 曾祥君¹, 欧阳帆²

1.长沙理工大学,湖南长沙 410114;
2.国网湖南省电力公司电力科学研究院,湖南长沙 410208

出版日期:2023-02-25 发布日期:2023-03-03
作者简介:贺世庚(1999),男,主要从事电力系统保护与控制的研究工作。
基金资助:
国家自然科学基金项目(51737002,52037001);湖南省自然科学基金项目 (2021JJ30729)。

A New Method of Ground Parameter Measurement and Grounding Fault Sensitive Perception for Distribution Network Based on Feeder Power

HE Shigeng¹, YANG Libin¹, YU Kun¹, ZENG Xiangjun¹, OUYANG Fan²

1. Changsha University of Science & Technology, Changsha 410114, China;
2. State Grid Hunan Electric Power Company Limited Research Institute, Changsha 410208, China

Online:2023-02-25 Published:2023-03-03

摘要/Abstract

摘要： 针对传统对地参数测量方法在建模和原理上存在的误差,提出了基于馈线功率的中性点不接地配电网对地参数精确测量方法,在中性点外加可控电压源调控零序电压,求取各馈线上有功与无功功率,并结合馈线功率与对地参数间关系,实现各馈线及系统对地电导和电容参数精确测量;进一步提出了基于馈线功率的单相接地故障灵敏感知方法,根据故障与正常时各馈线功率因数角特征差异,精准判别配电网母线及馈线是否故障。该方法依据馈线功率与对地参数、功率因数角间的数学联系,能有效解决系统对地参数测量难题,实现单相接地故障灵敏感知,并准确区分母线与馈线故障。在PSCAD/EMTDC仿真环境及10 kV真型配电网实验室中对所提方法进行了仿真与实验验证。分析结果表明,该方法测量精度高,故障感知能力强,具备一定的工程应用价值。

关键词: 配电网, 对地参数, 故障感知, 接地故障, 馈线功率

Abstract: Aimed at the errors in modeling and principle of traditional measurement methods for grounding parameters, an accurate measurement method for grounding parameters of neutral ungrounded distribution network based on feeder power is proposed. By adding a controllable voltage source to the neutral point to regulate the zero sequence voltage, the active and reactive power of each feeder line is obtained, and combining the relationship between feeder line power and grounding parameters, the accurate measurement of the conductance and capacitance parameters of each feeder and system to ground are achieved. Furthermore, a sensitive sensing method of single-phase grounding fault based on feeder power is proposed, which can accurately identify whether the bus and feeder of distribution network are in fault through the difference of power factor angle characteristics between fault and normal feeder. This method can effectively solve the measurement problem of system to ground parameters, realize the sensitive sensing of single-phase ground fault, and accurately distinguish the bus and feeder faults based on the mathematical relationship between feeder power and ground parameters, power factor angle. The proposed method is simulated and verified in PSCAD/EMTDC simulation environment and 10kV real distribution network experimental field. The analysis results show that the method has high measurement accuracy, strong fault perception ability and certain engineering application value.

Key words: distribution network;grourd parameters;fault perception;grounding fault;feeder power

中图分类号:

TM934

贺世庚, 杨理斌, 喻锟, 曾祥君, 欧阳帆. 基于馈线功率的配电网对地参数测量与接地故障灵敏感知新方法[J]. 湖南电力, 2023, 43(1): 50-57.

HE Shigeng, YANG Libin, YU Kun, ZENG Xiangjun, OUYANG Fan. A New Method of Ground Parameter Measurement and Grounding Fault Sensitive Perception for Distribution Network Based on Feeder Power[J]. Hunan Electric Power, 2023, 43(1): 50-57.

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基于馈线功率的配电网对地参数测量与接地故障灵敏感知新方法

A New Method of Ground Parameter Measurement and Grounding Fault Sensitive Perception for Distribution Network Based on Feeder Power

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