750 kV输变电示范工程系统小扰动试验分析

为向后续750 kV超高压工程建设和百万伏级特高压工程建设提供参考和借鉴，对750 kV官厅—兰州东输变电示范工程建设和运行过程中的经验进行总结和分析十分必要，应用单机无穷大母线系统小扰动线性化数学模型分析了小扰动试验过程中兰州东和官亭2站的有功功率变化过程，得出了在公伯峡电站切机的扰动情况下，西北电网系统阻尼比较弱，系统静态稳定性能较差，并将分析结果与切机小扰动试验时系统频率波动变化时间进行比较，发现试验结果与分析结果吻合。

Analysis on System Small Disturbance Test of 750kV Pilot Project

To proffer reference for follow-up 750kV and1000kV ultra high voltage (UHV) power transmission projects,it is necessary to summarize and analyze the experiences fromthe construction and operation of 750kV transmission andtransformation project from Guanting to East Lanzhou that iscompleted in September, 2005. By means of linearmathematical model of small disturbance for single machineinfinite buses, the active power variation processes in EastLanzhou and No. 2 substation in Guanting, in other words atthe both terminal of the pilot project, during small disturbancetests are analyzed. The results of the tests show that under thedisturbance, i.e., the generating unit in Gongboxia powerstation is tripped out, the system damping of China NorthwestPower Grid is insufficient, so that the static stability of the gridis weak. Comparing the analysis results with the fluctuationtime of system frequency during the tests, it is found that testresults coincide with analysis results.