复杂场景下失步中心定位及振荡中心漂移规律  

Locating of Out-of-Step Centre and Mechanism of Oscillation Centre Migrating Under Complicated Scenes

作　　者：张艳霞[1] 蒙高鹏 赵冉[1] 高瑾[1] 张亚洲[1] 

机构地区：[1]智能电网教育部重点实验室(天津大学),天津市南开区300072

出　　处：《电网技术》2015年第8期2264-2269,共6页Power System Technology

摘　　要：研究了电力系统发生失步振荡时,系统两侧电势幅值不等与全系统阻抗角不相同同时存在的场景下,基于等值双机系统的失步中心的定位方法和振荡中心的漂移规律,进而实现了振荡中心的实时定位。文中通过定义的节点位置函数与两侧电势幅值比的关系确定失步中心位置,给出了联络线上是否存在失步中心的条件。在失步中心定位的基础上,分析了振荡中心的漂移范围及4种典型漂移状态,提出了基于母线处测量阻抗相位角的振荡中心定位判据。仿真结果验证了分析的正确性。Location of out-of-step centre and mechanism of oscillation centre migration are studied considering impedance irregularity and potential amplitude inequality based on two-machine equivalent system model, then position of oscillation centre is detected in real time. It is concluded that position of out-of-step centre can be determined with relationship between the function of node location defined in this paper and potential amplitude＇s ratio of both sides, and the rules are derived whether the lines between both power systems contain out-of-step centre. After that, migration range of oscillation centre is analyzed accurately, four types of migration states are found, and locating criteria for oscillation centre are presented by measuring phase angle of impedance on power system bus. Finally, validity of the analysis is verified with simulation results.

关 键 词：失步振荡 振荡中心漂移 阻抗不均匀 两侧电势幅值不等 失步中心及振荡中心定位 

分 类 号：TM74[电气工程—电力系统及自动化]