远距离输电断面暂态稳定极限的影响因素分析

Analysis on factors influencing transient stability limits of long-distance transmission profile

对影响远距离输电断面暂态稳定极限的各种因素进行了分析,包括:计算稳定极限时的系统初始工况、受端系统的负荷水平以及受端系统与其他系统互联。采用两机等值系统模型对初始工况及负荷水平变化对稳定极限的影响进行分析。对于受端系统与其他系统互联的影响,稳定分析采用了多机系统的单机等面积稳定判据。理论分析和算例验证表明,受端电网负荷水平提高,稳定极限上升,而受端与其他电网互联会引起稳定极限下降。

The factors influencing transient stability limits of long-distance transmission interface were analyzed in this paper. These factors include the variation of initial base cases under certain load level, the differences of load levels in receiving system, and the interconnection of receiving system with the other system. Two-generator equivalence system model and equal area criterion for transient stability analysis was employed in the process of analysis. Theoretical analysis and cases validation shows that the transmission limit will increase with the augment of load level at receiving system, and will decrease greatly if the receiving system interconnects with other large grid.