密集型固有振荡模式电力系统的模态分析

大规模电力系统具有振荡模式非常密集的特点,参数的微小变化会使系统产生模态不稳定现象。运用复模态摄动理论对密集型固有振荡模式电力系统进行了模态分析,结果表明,系统的特征值对参数摄动不敏感,但密集振荡模式对应的左、右特征向量有很大的变化,影响状态变量对振荡模式的可控性和可观性。最后,以新英格兰10机系统和NPCC 48机系...

Modal Analysis of Electric Power System with Close Oscillation Modes

The frequencies of natural oscillation mode in large power system are very close.When the system parameters experience minor changes,system has the potential to instability of close modes.A perturbation technique for complex modes is used to make modal analysis of the close modes shapes in a power system.It shows that eigenvalues are not sensitive to the perturbation while the left eigenvectors and right eigenvectors of close modes change a lot after the perturbation of system parameters.This will directly affect the controllability and observability of state variables on the oscillation modes.The 10-machine New England and NPCC 48-machine test systems are employed to verify the conclusion. This work is supported by Fundamental Research Funds for the Central Universities(No.09MG07) and Natural Science Foundation of Hebei Province(No.E2010001693,No.E2011502014).