基于电源分区与短路阻抗距离的电压无功分区方法

Network partitioning for reactive power/voltage control based on power sources clustering and short-circuit impedance distance

基于先电源节点分区后负荷节点映射分区的思想,提出了一种基于电源分区与短路阻抗距离的电压无功分区方法。首先以无功/电压灵敏度来定义电气距离,采用凝聚的层次聚类算法直接对电源节点进行分区。然后定义了多无功源节点对单个负荷节点的短路阻抗距离,并以短路阻抗距离最短原则来实现负荷节点的映射分区。该方法不仅能保证电气距离近的无功源被分在同一个区域,而且还能保证负荷节点与对其控制能力强的多个无功电源节点被分在同一个区域。另外,该方法还具有分区结果与潮流状态无关的优点。IEEE39节点系统和重庆实际电网的仿真结果验证了所提方法的有效性。

A novel partitioning method is proposed based on power sources clustering and short-circuit impedance distance, which is characterized by Mvar source nodes partitioning and load nodes mapping. The electrical distance between two Mvar source nodes is defined based on the sensitivity of voltage to reactive power injection, and the agglomerate hierarchical clustering algorithm is applied to partition the Mvar source nodes. Then the short-circuit impedance distance between multiple Mvar source nodes and a single load node is defined, and the mapping between load nodes and Mvar sources partitions is realized by minimizing the short-circuit impedance distances. With the presented method, not only the Mvar source nodes within a short electrical distance from each other, but also the load nodes and the multiple Mvar source nodes having a strong control relation can be clustered into the same partition. The other advantage with the method is that the partition is independent of the power flow state. Simulation results on IEEE39-bus system and the real Chongqing grid data demonstrate the effectiveness of the presented method.