Parallel Computing Of Three-phase Flow Calculation For Distribution System With Distributed Power

With the promotion of distributed power, distribution system is developing into intelligence. The growing complexity of distribution system’s structure requires flow algorithms for distribution system can not only handle three-phase issues but also take loop power flow into consideration. In addition, distribution system is large-scaled and multi-node. It takes considerable time to carry out a whole-network power flow calculation. Distributed parallel computing was considered in real-time calculation for such a huge node size.According to the basic principles and control characteristics of distributed power, the calculation model of distributed power in distribution system flow calculation has been established. In addition to traditional PV node and PQ node, PI node and PQ(V) node is added. A new ideology-multi-slack-bus was proposed to calculate flow of feeders in loop structure. Appling this ideology to traditional forward and backward substitution method can obtain a faster convergence rate and less iteration. The examples result shows that the speed and accuracy of this method can meet the needs of actual project.In this paper, a distributed parallel computing platform with hierarchical and distributed structure has been built. Service instances and management module are designed to realize the flexible deployment and load balancing of tasks. ZeroMQ middleware technology is applied to establish the communication mechanisms. On the platform, the large-scaled calculation task was decomposed into a number of subtasks. Running these subtasks by different executers simultaneously, computing speed has been significantly improved. The examples result shows that as the scale of network increasing, the advance of platform is obvious.