风电接入下基于AP聚类的无功功率—电压控制分区方法

Reactive Power-Voltage Control Partitioning of Wind Power Integration System Based on Affinity Propagation Clustering

电网无功功率—电压控制分区是分级电压控制的基础。风电接入造成电网运行状态具有随机波动性,为获得能适应各种风电出力稳定的全网分区,考虑以节点间电气距离期望矩阵作为分区依据,采用先进的仿射传播(AP)聚类进行电网节点分区。由于PQ节点与PV节点响应过程不同,首先基于AP聚类对PQ节点进行分区;然后以PV节点为论域,在保证区域连通性和可控性的前提下实现PV节点归类至合适的PQ分区,最终完成全网分区。最后从聚类区内耦合性、区间解耦性以及分区电压控制灵敏度出发,定义分区质量评估指标,客观评价分区质量。仿真结果表明了所提方法的可行性和有效性。

Partitioning for reactive power-voltage control is the foundation of voltage hierarchical control. The operation states of system fluctuate stochastically because of large scale wind farm integration. To get stable partition suitable for all sorts of wind farm output situations, the mathematical expectation of electric distance between all nodes in the grid is taken as the basis for partition, and the advanced affinity propagation （AP） method is used as the core algorithm. As the response process of the PV nodes is different from that of the PQ nodes, first partition all the PQ nodes based on the AP method. Then take all the PV nodes as target domain and divide them into the suitable PQ cluster on the premise in connectivity and controllability to achieve the final grid partitioning. Finally, define the partition quality evaluation indicators to assess the partitioning results considering segregation property among clusters, decoupling property in cluster and voltage controlling ability. Simulation results indicate the feasibility and effectiveness of the method proposed.