750kV线路投运后甘肃电网动态稳定性分析  

Dynamic stability analysis of Gansu power grid after 750kV lines was put into operation

作　　者：智勇 王官宏[2] 肖洋[2] 朱方[2] 岳雷[2] 周喜超 晁晖[2] 

机构地区：[1]甘肃省电力科学研究院,甘肃兰州730050 [2]中国电力科学研究院,北京100192

出　　处：《电力系统保护与控制》2011年第3期114-118,共5页Power System Protection and Control

摘　　要：分析了2009年甘肃电网冬大及夏大运行方式下系统的动态稳定性,通过频率小干扰计算发现甘肃陇南电网、河西电网及洛大电网存在局部电网内部及对系统的弱阻尼振荡模式。对存在低频振荡风险的电网进行了深入分析,通过在模式相关机组上配置合适电力系统稳定器(PSS)可以大幅提高系统的阻尼。稳定计算表明,在给出的PSS的配置方案下甘肃全网没有出现低于3%的弱阻尼振荡模式,甘肃电网可以安全稳定运行。提出了励磁系统后续实测建模工作的建议。The dynamic stability under the typical cases of winter heavy load mode and summer heavy load mode in 2009 is analyzed.By using frequency small signal disturbance calculation,it is found that there is weak damping mode in local oscillation and inter-area oscillation respectively in Longnan Power Grid,Hexi Power Grid and Luoda Power Grid.After analyzing the power grid with the risk of low frequency oscillation,it points out that the PSS installed on those units related to the mode as aforesaid can significantly improve the system damping. The stability calculation result shows the damping ratio less than 3% does not exist in Gansu Power Grid and the system is safety and stable.The suggestion for field test of excitation system modeling is proposed.

关 键 词：动态稳定 PSS 振荡模式 电力系统 

分 类 号：TM712[电气工程—电力系统及自动化]