互联电网失稳模式演化现象及其影响因素分析  

Unstable Modes Evolution and Its Influencing Factors Analysis in Interconnected Power Grids

作　　者：任先成[1] 李威[1] 薛禹胜[1] 薛峰[1] 方勇杰[1] 李勇 

机构地区：[1]南瑞集团公司(国网电力科学研究院),江苏省南京市211106 [2]华中电力调控分中心,湖北省武汉市430077

出　　处：《电力系统自动化》2013年第21期9-16,共8页Automation of Electric Power Systems

基　　金：国家电网公司大电网重大专项资助项目(SGCC-MPLG003-2012);国家电网公司科技项目"特大型同步电网严重故障下的主动防御措施研究"~~

摘　　要：随着电网规模的扩大,一些非常见的动态行为引起了关注。基于扩展等面积准则(EEAC)识别主导模式及多摆失稳的理论,分析了局部地区短路故障导致跨大区互联电网首摆和第2摆两种失稳模式之间变化的现象,阐明了随着系统参数、控制策略变化的系统失稳模式演化机理。分析了领前群内非同调特性对切机控制效果的影响,指出短路点近区机组加速导致大区电网内负荷功率和直流外送功率减小,恶化了大区机组的稳定性。通过实际算例仿真验证了分析结论。With the expansion of power grids, some unusual dynamic behaviors are emerging. In this paper, based on the extended equal area criterion （EEAC）, the first swing and the second swing of angle instability phenomena in the interconnected power grid are demonstrated. The evolution phenomena of unstable modes due to the variation of system models, parameters and control strategies are analyzed. The mechanisms of negative control effects of generator tripping in the non-coherent critical generator＇s cluster are revealed. It is also pointed out that the rapid decrease of the DC power and load delivered during the accelerating process of local area generators close to the short circuit point deteriorates the interconnected power system transient stability.

关 键 词：大电网 暂态稳定 失稳模式 多摆失稳 反摆失稳 非同调 负效应 惯量中心 

分 类 号：TM712[电气工程—电力系统及自动化]