大规模交直流互联电力系统潮流分区并行算法  

Parallel Method of Load Flow Analysis for Large-Scale AC/DC Interconnected Power System

作　　者：薛振宇[1] 房大中[1] 杨金刚[1] 房晶辉[2] 

机构地区：[1]天津大学电力系统仿真控制教育部重点实验室,天津300072 [2]天津大学建筑设计院,天津300072

出　　处：《天津大学学报》2011年第8期683-689,共7页Journal of Tianjin University(Science and Technology)

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB219700);国家自然科学基金资助项目(50777046)

摘　　要：提出一种大规模交直流互联电力系统潮流分区并行算法.该方法按AC/DC电力系统的互联特性,通过区域电网间的AC/DC联络线对电网进行划分,建立了AC/DC互联电力系统潮流分析的2层计算树模型.2层计算树的根结点由不连通的AC/DC联络线组成,叶结点为划分后的交流子系统.算法引入撕裂后边界母线间的虚拟电流作为2层树根结点之间的协调变量,进而得到根结点和叶结点子系统边界母线间的标准化电压电流约束方程.通过上述约束方程实现大规模AC/DC互联电力系统潮流分区并行计算的双向迭代新算法.该算法不改变牛顿法潮流算法的收敛性和计算精度,各叶结点子系统可采用传统的潮流算法进行计算,可在多核计算机上并行实现.以南方电网某运行方式数据为测试系统的分析表明,所提分区正确有效,计算结果与商业软件BPA计算结果具有较好的一致性.A parallel method for load flow calculation of large-scale AC/DC interconnected power system was proposed. According to the characteristic of the AC/DC interconnected power system, the power grid was partitioned with buses of AC/DC tie-lines between region grids by this method. Then two-level tree mode for load flow analysis of AC/DC interconnected power system was established. In the two-level tree model, the root node is composed of unconnected AC/DC tie-lines and the leaf nodes represent the partitioned AC sub-system. The currents between the partitioned boundary buses were defined as coordinated variables, and the restrict equations of currents and voltages of boundary buses were derived. With these restrict equations, a novel bi-directional iteration load flow partition parallel algorithm of AC/DC interconnected power system was developed. This method preserves the precision and convergence of AC/DC Newton load flow method and the region grid load flow is easily implemented in a parallel environment. The study on one representation of South China Power AC/DC grid system indicates the availability and effectiveness of the parallel method. The result obtained by the method is consistent with those by the BPA software.

关 键 词：交直流电力系统 潮流计算 并行计算 计算树 

分 类 号：TM743[电气工程—电力系统及自动化]