A Novel Two-Level Fast Mixed Load Flow Algorithm for Multi-Area Power Systems.

An efficient load flow solution technique is required for taking various control and operations decisions. This paper presents an efficient and robust load flow algorithm for application to transmission and distribution networks. In order to face keen competition in market, the coordinated operation between transmission and distribution systems is required. Therefore, the transmission and distribution systems are studied as a whole in this paper. A novel master slave splitting (MSS) iterative method is developed for solving the hybrid mixed load flow (MPF) problem. In the proposed method, with introducing the boundary fictitious values, the MPF problem of large scale is split into a transmission and lots of distribution sub-problems. As the size of matrix used is very small compared to those in conventional methods, the amount of memory used is very small, the speed is very high, and the relative speed of calculation increases with the size of the system. In order to fit the different features between transmission and distribution networks, each sub-problem can be solved with different algorithms. The algorithm proposed in this paper is a “novel but classic” technique. Several case studies are carried out, and the accuracy, convergence, efficiency and reliability of the proposed method are validated. (Keywords: load flow, transmission system, distributio