互联电力系统动态等值模型的可辨识性分析

摘要

对互联大型电力系统分析采用动态等值可以显著降低计算量，并能较好反映系统动态特性．动态等值的同调等值法和模式等值法大都用于离线分析，在线动态安全分析常需要对外部系统作在线的动态等值，这时需要采用辨识等值方法：先确定系统等值模型，模型参数通过辨识获得．给出了计及励磁系统、考虑发电机凸极特性和负荷静特性的电力系统区域动态等值模型；分析了模型的可辨识性．从理论上证明：充分利用稳态条件，等值模型中所有参数均是可以辨识的．%Dynamic equivalent for large power system can reduce the computing effort and manifest the ma- jor characteristics. By reason of needing to know system structure and parameters of the equivalent sys- tem, coherency method and mode method are mainly used for offline dynamic equivalent. Therefore, iden- tification method is needed for online equivalent. It determines system equivalent model firstly and then i- dentifies model parameter. This paper gives a general regional dynamic equivalent model which considers the excitation system and has salient pole machine characteristic. It analyses identification of the model, and proves that equivalent model parameters can be identified if the steady-state conditions are used.