基于有限PMU的广域后备保护研究  

Study of wide area backup protection based on limited number of PMU

作　　者：陈静[1] 刘涤尘[1] 王宝华[2] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072 [2]南京理工大学自动化学院,江苏南京210094

出　　处：《电力系统保护与控制》2012年第17期67-71,77,共6页Power System Protection and Control

基　　金：国家自然科学基金项目(51077103)~~

摘　　要：对新型的基于有限数量相量测量单元(PMU)的广域后备保护进行了研究。通过布点算法,在电网相关母线中安装有限的相量测量单元,根据布点算法形成的电压推算关系构成保护区,将故障视为'透明',利用安装点的实测值推算保护区内其余的母线电压。故障时,根据正序电压幅值分布特征定位故障关联母线,推算该母线关联支路的有功功率,根据相对误差特征选出故障线路。PMU的高速实测数据的引入使得实时故障定位成为可能。算例仿真验证了基于有限PMU的广域后备保护的正确性和有效性。A principle of wide area backup protection based on limited number of PMU is analyzed. Through a placement algorithm, a limited number of PMUs are placed on a few buses in the power grid. Then, the power grid is divided into several protection zones according to the estimation structure formed by the placement algorithm. When a short-circuit fault occurs in the transmission line, the bus with the lowest positive sequence voltage will be identified. Then, the branches connected to the identified bus are selected and active power flow is estimated. The short-circuit fault is invisible during the estimation process. Then the faulted line is identifi＇ed according to the relative error. The high speed data of PMU makes real-time fault location possible. The schemes and algorithms mentioned above are proved to be correct and effective by lots of simulations.

关 键 词：广域后备保护 相量测量单元 布点算法 母线电压 支路有功潮流 

分 类 号：TM77[电气工程—电力系统及自动化]