基于机电距离的聚类方法在动态等值中的应用

系统动态等值是在保持适当精度的前提下提高分析速度的有效措施之一。文中综合利用系统各单元间电气和机械距离、系统参数以及各种典型扰动作用下的暂态响应曲线，提出了新的动态等值方法。该方法根据系统各单元间机电距离的量化指标，应用离差平方和方法对初始系统进行聚类分析；然后根据聚类结果将系统划分成内、外部子系统，并对外部系统进行参数等值，得到与初始系统等价的简化系统。10机39母线新英格兰系统的验算结果表明，所提出的动态等值方法较好地保留了外部系统对研究系统动态行为的影响，有效地简化了初始系统。

Application of Clustering Method Based on Electromechanical Distance Between Different Units in Power System Dynamic Equivalence

Dynamic equivalence has been proved to be one of the effective measures to improve analysis speed with good precision. A new dynamic equivalence method based on the electromechanical distance is presented. Different quantified indexes are defined and used to describe the ties between different parts in the power system. The mechanical and electrical distances between different units and the transient dynamic response curves subjected to different faults are synthesized to find information about the electromechanical distance in the power system. The inner squared distances are used in the aggregation about the original system. Then the whole system is partitioned into internal and external subsystems according to the inner squared distances. Equivalence is carried out with the external system and equivalent parameters for the simplified system are calculated simultaneously. Finally, the simulation results concerning the New England 39-bus system show that the algorithm proposed has high accuracy and better calculation efficiency and the influence of the external system on the internal system is well retained.