故障系统低频振荡特征值分析方法  

Analysis methods for low-frequency oscillation eigenvalue of faulty system

作　　者：马静[1] 彭明法[1] 王彤[1] 杨奇逊[1] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《电力自动化设备》2014年第4期13-19,共7页Electric Power Automation Equipment

基　　金：国家重点基础研究发展计划(973计划)项目(2012-CB215200);国家自然科学基金资助项目(51277193;509070-21;50837002);中央高校基本科研业务费专项资金资助项目(11-MG01);教育部留学回国人员科研启动基金资助项目([2011]1139);河北自然科学基金资助项目(E2012502034);中国电机工程学会电力青年科技创新项目([2012]46);河北省电力公司科技项目(KJ[2012]278-280)~~

摘　　要：针对平衡点特征值法不能正确反映故障系统的振荡特性,以及轨迹特征值法窗口宽度难以选择的问题,提出一种适用于分析故障系统特征值的方法。利用共享因子将故障切除后的系统进行等值,再利用原网络及故障分量网络支路电流求取故障后各支路电流及功率,在此基础上,建立系统的等值模型,在各测点处将模型分段线性化,并结合实际受扰轨迹求解故障系统特征值的时间序列。2机和16机系统仿真结果表明,所提方法能实时准确地描述故障系统的时变振荡特性。Since the equilibrium-point eigenvalue method cannot correctly reflect the oscillation characteristics of faulty system and the trajectory eigenvalue method is difficult to set its window length,an eigenvalue analysis method suitable for faulty system is proposed,which equates the system after fault removing by mutual factor,calculates the post-fault current and power for each branch according to the branch currents of primal power grid and fault component grid,builds the equivalent system model,linearizes piecewise the model at each measuring point,and solves the chronological eigenvalue sequence of faulty system based on the measured disturbed trajectory.The simulative results of 2-generator system and 16-generator system show that the timevarying oscillation characteristics of faulty system are precisely described in real time.

关 键 词：电力系统 故障等值 低频振荡 时变特征值 模型轨迹法 稳定性 模型 

分 类 号：TM712[电气工程—电力系统及自动化]