不受非同步采样影响的母线差动保护方案研究  

Research on the busbar differential protection scheme immune to asynchronous sample data

作　　者：雷明[1] 王文森[2] 康小宁[2] 刘峰[1] 裘峰源[1] 

机构地区：[1]国家电网公司陕西省电力公司,陕西西安710048 [2]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

出　　处：《电力系统保护与控制》2016年第22期96-101,共6页Power System Protection and Control

基　　金：国家自然科学基金面上项目(51177127);国家电网陕西省电力公司科技合作项目~~

摘　　要：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。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 differential protection setting value directly. Therefore, it is easy to apply the proposed method in practice.

关 键 词：智能变电站 母线差动保护 采样同步 不平衡电流 

分 类 号：TM773[电气工程—电力系统及自动化]