3区域互联电力系统动态等值的辨识方法

对大型电力系统采用动态等值可以显著降低计算量，并能突出主要特征。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。现代电力系统中越来越多的区域形成互联，对多区域互联电力系统的动态等值研究变得尤为重要，但以往的文献都是针对2区域系统。文中给出了3区域互联电力系统的动态等值模型，分析了模型的可辨识性，从理论上证明了：充分利用扰动前、后的稳态条件和动态过程，等值模型中所有参数均是可以辨识的。在可辨 识性分析的基础上，运用进化策略法进行模型的参数辨识，最后通过系统仿真加以验证，算例结果表明了等值模型的有效性和其参数辨识的可行性。

Identification Approach to Dynamic Equivalents of the Power System Interconnected with Three Areas

Dynamic equivalent can reduce the computing effort and manifest the major characteristics. By reason of needing to know system structure and parameters of the equivalent system, coherency method and mode method are mainly used for off-line dynamic equivalent. Therefore identification method is needed for on-line equivalent. In modern power systems, more and more areas are interconnected. It is important to study the identification of multi areas equivalent. For the power systems interconnected with three sub-systems, this paper gives an equivalent model, analyses the identifiability of the model, and uses an evolutionary strategy algorithm for the parameter estimation. It is shown by the case studies of a 36-bus system that the model and the parameter estimation are valid.