基于PMU和改进戴维南等值模型的电压稳定在线监视  

On-line Voltage Stability Monitoring Based on PMU and Improved Thevenin Equivalent Model

作　　者：刘明松[1] 张伯明[1] 姚良忠[2] 孙宏斌[1] 吴文传[1] 

机构地区：[1]清华大学电机系电力系统国家重点实验室,北京市100084 [2]AREVA输配电集团技术中心,英国斯塔福德郡

出　　处：《电力系统自动化》2009年第10期6-10,共5页Automation of Electric Power Systems

摘　　要：相量测量单元(PMU)量测和戴维南等值模型的结合,为电压稳定在线监视提供了新思路。文中利用电路原理的相关理论,对传统戴维南等值模型的不足进行了定性分析,并在此基础上提出了一种改进的戴维南等值模型。对改进模型的量测方程、可解性条件、求解方法和误差分析等方面进行了研究,以负荷裕度为电压稳定性指标,将改进模型用于电压稳定在线监视,并对数据窗的选取、改进模型的退化、应用环境等相关问题进行了分析。对IEEE 39节点系统进行了仿真,仿真结果表明改进模型比传统模型具有更好的精度和适用性。A new way to on-line voltage stability monitoring has been provided with the combination of phasor measurement unit （PMU） measurements and Thevenin equivalent model . The disadvantages of traditional Thevenin equivalent model are analyzed qualitatively based on circuit analysis theory. An improved Thevenin equivalent model is proposed based on the analysis. Measurement equations, solvability conditions, solution methods and error analysis of the improved model are studied. The improved model is applied to on-line voltage stability monitoring, with load margin as a voltage stability index. Furthermore, several aspects concerning the proposed model are studied including data window selection, model degeneration, and application environment. The IEEE-39 bus system is used as a testing system. Simulation results demonstrate better precision and adaptability with the improved model.

关 键 词：相量测量单元 电压稳定 在线监视 改进戴维南等值 

分 类 号：TM76[电气工程—电力系统及自动化]