电力系统同调动态等值的述评

同调性是电力系统动态等值的理论依据,只有当每个被等值的子系统的内部严格同调时,原系统的动态特征才能被保全在等值系统中。从同调群的定义和要点、同调群的识别、等值模型及参数的确定等方面评述动态等值的研究和应用现状。指出动态等值的原则应符合物理本质,即机组的同调性不但受系统拓扑及所有参数的影响,并且密切依赖于扰动场景。强调只有直接从完整的受扰轨迹中挖掘深层信息,才能可靠识别非自治非线性系统中的同调群。指出轨迹的主导模式反映系统动态行为的内在机理,在同调等值问题上有很好的应用前景。

A Critical Review on Coherency-based Dynamic Equivalences

Coherency is one of the theoretical bases for power system dynamic equivalences. Only when each subsystem to be reduced keeps coherent inside respectively, dynamic characteristics of original system can be rigorously preserved. Researches and applications on dynamic equivalences are reviewed from aspects of coherency definitions, coherency identifications, equivalent models and parameters. In accord with the physical truth, dynamic equivalence is not only affected by system topology and other parameters, but also related to the disturbance circumstance. It is emphasized that, only by dining information from the whole disturbed trajectories, the coherency identification in the nonautonomous and nonlinear system can be reliably accomplished. The dominant mode of the trajectories reflects the inherent mechanism of the system' s dynamic behavior, so it has good prospect in coherency equivalences.