基于最小均方时延估计法的强迫功率振荡扰动源定位方法  

Disturbance Source Location of Forced Power Oscillation Based on LMS Time Delay Estimation Method

作　　者：朱振山[1] 刘涤尘[1] 廖清芬[1] 涂炼[1] 韩翔宇[1] 赵强 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072 [2]中国电力科学研究院,北京市100192

出　　处：《电力系统自动化》2015年第4期58-62,共5页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2011AA05A119);国家电网公司大电网重大专项资助项目(SGCC-MPLG029-2012)~~

摘　　要：当电网发生强迫功率振荡时,快速找到扰动源并将其切除,对保障电网的安全稳定运行具有重要意义。电网中强迫功率振荡引起的机电扰动会沿着输电线路在电网中传播,根据传播到不同位置的扰动波形具有时间延迟的特点,提出了一种利用最小均方时延估计法定位扰动源的方法。利用二次差分法检测强迫功率振荡起振后,通过计算关键母线频率出现扰动波形的时差和先后次序,分析扰动传播的顺序,从而确定扰动源的位置。该方法只需要广域测量信息,可以实现在线应用。四机两区域系统算例和华中电网算例均验证了该方法的有效性。When forced power oscillation occurs in a power system, location and elimination of disturbance sources is of great significance for the secure and stable operation of the system. The electromechanical disturbance caused by the forced power oscillation travels along the transmission line. According at the time delay characteristics of disturbance waveforms at different locations, a novel method for locating disturbance sources using the least mean square （LMS） time delay estimation method is proposed. In this method, the starting of forced power oscillation is tested by the second order difference method, and the travelling sequence of the disturbance is obtained by calculating the time delay of the disturbance waveforms at different buses, thus the disturbance source is located according to the sequence. The proposed method only needs the wide area measured data and is capable of on-line application. The validity of the proposed approach is verified by simulation results of a four-machine two-area power system and in the Central China power grid.

关 键 词：强迫振荡 扰动源定位 二次差分法 时延估计 广域测量系统 电力系统 稳定分析 

分 类 号：TM712[电气工程—电力系统及自动化]