不受非同步采样影响的母线差动保护方案研究

提出了一种新的母线保护原理,该原理通过引入母线电压对现有差动判据进行等式变形得到,可有效消除电流采样非同步的影响。结合陕西电网实际工程,建立了相应的母线故障仿真模型。仿真分析了母线区内、外各种故障情况下,所提保护判据和常规母差保护的动作情况。仿真研究表明,常规母差保护判据在采样数据不同步时,存在区内故障误选相问题和区外故障误动问题;而所提方案可有效消除采样非同步的影响,区内故障保护可靠动作,区外故障可靠不动。同时,保护的定值整定原则与常规母差保护相同,无需特殊整定。...

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Published in电力系统保护与控制 Vol. 44; no. 22; pp. 96 - 101
Main Author 雷明 王文森 康小宁 刘峰 裘峰源
Format Journal Article
LanguageChinese
Published 国家电网公司陕西省电力公司,陕西西安,710048%西安交通大学电力设备电气绝缘国家重点实验室,陕西西安,710049 2016
Subjects
不平衡电流
智能变电站
母线差动保护
采样同步
母线差动保护
smart substation
busbar differential protection
智能变电站
不平衡电流
unbalanced current
synchronous sampling
采样同步
Online AccessGet full text
ISSN1674-3415
DOI10.7667/PSPC151983

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Summary:提出了一种新的母线保护原理,该原理通过引入母线电压对现有差动判据进行等式变形得到,可有效消除电流采样非同步的影响。结合陕西电网实际工程,建立了相应的母线故障仿真模型。仿真分析了母线区内、外各种故障情况下,所提保护判据和常规母差保护的动作情况。仿真研究表明,常规母差保护判据在采样数据不同步时,存在区内故障误选相问题和区外故障误动问题;而所提方案可有效消除采样非同步的影响,区内故障保护可靠动作,区外故障可靠不动。同时,保护的定值整定原则与常规母差保护相同,无需特殊整定。
Bibliography:LEI Ming1, WANG Wensen2, KANG Xiaoning2, LIU Feng1, QIU Fengyuan1 （1. State Grid Shaanxi Electric Power Company, Xi＇ an 710048, China; 2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi＇ an Jiaotong University, Xi＇ an 710049, China）
smart substation; busbar differential protection; synchronous sampling; unbalanced current
41-1401/TM
This paper proposes a new method of busbar differential protection, which is deduced from conventional busbar differential protection by introducing busbar voltages and can eliminate the impact of asynchronous sample data. In order to analyze the characteristics of the proposed method, a PSCAD busbar simulation model based on real substation of Shaanxi grid is built. The simulations of internal and external faults show that, the conventional busbar differential protection will malfunction while using asynchronous sampling data, and the proposed method can operate correctly during same circumstances. Meanwhile, the proposed method can use the conventional busbar
ISSN:1674-3415
DOI:10.7667/PSPC151983