新疆—西北电网联网前后阻尼特性研究  

Study on damping characteristics of Xinjiang-Northwest power grid before and after interconnection

作　　者：王佳明[1] 刘文颖[1] 牛拴保 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]西北电网有限公司,陕西西安710048

出　　处：《电力系统保护与控制》2010年第16期92-98,共7页Power System Protection and Control

基　　金：国家电网公司科技计划项目(SGKJ[2007]1078)

摘　　要：从系统阻尼特性出发,从理论上推导了联络线阻抗值对互联电网阻尼的影响。通过小干扰稳定分析法和时域仿真法分析新疆-西北电网联网前后系统阻尼特性的变化,并采用Prony分析法校验联网前后的主振模式,结果表明联网后系统阻尼比减小,动态品质明显下降。增加新疆-西北电网省际间联络线降低互联阻抗后,仿真计算表明,互联电网动态稳定性大大提高。建议加快新疆-西北电网联络线建设。The effects of tie-line impedance value on the damp of interconnected power systems are analyzed theoretically from the viewpoint of damping characteristics.This paper focuses on the changes in damping characteristics before and after interconnection through the small signal stability analysis and time domain simulation,and makes a check of the dominant oscillation modes by means of Prony analysis before and after interconnection.Results show that the damping ratio of the system is decreased after the interconnection,and the dynamic quality is reduced significantly.The simulation after increase of tie-lines to reduce the tie-line impedance shows that the dynamic stability of interconnected system is improved significantly.The paper suggests speeding up tie-line construction of Xinjiang-Northwest power grid.

关 键 词：联络线阻抗值 小干扰稳定分析法 Prony分析法 阻尼特性 动态稳定性 

分 类 号：TM712[电气工程—电力系统及自动化]