联络线潮流对互联电网低频振荡模式的影响  

The influence of tie-line power flow on low-frequency mode in interconnected power system

作　　者：刘学智[1] 刘涤尘[1] 袁荣湘[1] 廖清芬[1] 黄涌[2] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072 [2]华中电网公司,湖北武汉430077

出　　处：《中国电力》2009年第10期39-41,共3页Electric Power

摘　　要：分析了单机无穷大系统的阻尼转矩机理,得出了阻尼转矩系数与输送功率的关系。以华中电网的鄂三峡—赣湘振荡模式为研究对象,通过改变发电机组的开停机状况,依次调节与此振荡模式强相关的省间断面潮流,并保持其他省间断面潮流不变,进行小干扰稳定计算。分析了联络线潮流变化对低频振荡模式的频率和阻尼比的影响,验证了系统阻尼随联络线潮流加重而恶化的结论。所提方法可以为实际系统的调度和运行提供参考经验。The damping characteristic of a single-machine and infinite bus system was analyzed, and the relation between damping torque coefficient and transmission power was derived. Furthermore, based on the oscillation mode of Hubei Three Gorges, Hunan and Jiangxi in central China power grid, by changing the start up and shut down states of the generator units and regulating the power flow of one provincial section which has strong correlation with the oscillation mode and others remaining the same, the small signal stability was calculated, and then the influence of the tie-line power flow on the frequency and damping ratio of low-frequency oscillation mode was analyzed. The proposed method can be applied to the actual scheduling and operation of power grid.

关 键 词：联络线潮流 低频振荡 阻尼转矩系数 阻尼比 

分 类 号：TM712[电气工程—电力系统及自动化]