基于潮流方程组拼接模式的互联系统分布式潮流计算

A Distributed Power Flow Calculation for Multi-area Interconnected Systems Based on Power Flow Equations Mosaic Pattern

目前互联电力系统使用集中式和分布式建模2种思路来获得全局广域潮流解,2种思路各有优缺点。文中力图将两者的优点结合起来,提出了一种带有集中式特点的分布式潮流拼接算法。该算法将各子网的导纳矩阵、节点注入功率向量、节点类型信息向量拼接起来构成全局潮流方程组,据其在某个子网侧计算出全局潮流后,将其余子网的潮流数据传送回去从而获得全网的分布式潮流。拼接算法无需进行全网一体化建模或模型拼接,各子网间亦无需进行协调迭代计算,但所求得的潮流计算结果却与一体化建模时完全一致。在IEEE9节点系统上进行的数值仿真实验表明了所述拼接算法具有较突出的优势。

Various power flow algorithms based on the centralized or distributed modeling to obtain the global wide area power flow for multi-area interconnected systems are proposed up to now, which have their own merits and demerits. The advantages of the methods based on the centralized and distributed modeling are tried to be combined in this paper and a mosaic algorithm for distributed power flow characterized by centralization is proposed. Admittance matrixes, nodal injected power vectors and node type information vectors of all subsystems are stitched together to form the global power flow equations in this algorithm. After the global power flow is gained at one subsystem using the global power flow equations, the power flow data of the other subsystems is transmitted back, The mosaic algorithm can get the same calculation result as that of the integrative modeling without the need of coordinative iteration calculation among the subsystems. An example of IEEE 9-bus system shows that the mosaic algorithm possesses prominent advantages.