惯量对区域振荡模式的影响

Influence of generator inertia on interarea oscillation mode

机组的惯量对区域振荡频率和阻尼有着较大的影响。以两机系统为例推导了区域振荡模式与不同区域机组等值惯量之间的关系,并以两机与四机系统作为仿真算例,利用特征根分析法,得出区域振荡模式随着不同区域等值惯量以及不同区域内机组惯量的变化曲线,把仿真结果与估算公式相比较,分析得出区域内机组不同调因素对区域振荡频率影响较小,而对区域振荡阻尼影响较大的结论。

Generator inertia has great influence on inter-area oscillation frequency and damping. The relationship between inter-area oscillation mode and generator＇s equivalence inertia is deduced based on a two-machine system. Furthermore,simulations on a two-machine system and a four -machine system are carried out to study the variation curves of inter-area oscillation modes with different area equivalence inertia and generator inertia by using eigenvalue analysis method. Compared the simulative results with the estimate formulation,it is concluded that the incoherency within a cluster of machines has little influence on inter-area oscillation frequency while has great influence on inter-area oscillation damping.