A Research Of OBDD-Based Searching Method For Active Splitting Strategies Of Power Networks

Large-scale interconnected power system is forming as the power system developing. However,security and stability issues of the power network become more prominent which brings new challenges to electricity workers. Moreover, as the interconnected power grid expanding, its linkage effects are more obvious. If not handled properly, a big range of blackout is likely to occur in interconnected grid, which will definitely cause serious social impact and huge economic losses. Based on the inadequate for the current research on active splitting issues, this paper mainly studies how to find proper splitting strategies of power system using OBDD-based method. And this paper has obtained the following achievements.Firstly, three steady-state constraints that power network active splitting must satisfy is studied, meanwhile, the definition of proper active splitting strategies are introduced and graph model with node weighted suitable for OBDD technology are constructed. The changes of physical characteristics and working state after deeply research for the power network, the node weight of graph model and practical simplified mathematical model has been established. In addition, mathematical expression matrix of graph model suitable for OBDD analysis has also been proposed.Secondly, the boundary conditions of proper strategies for power network splitting are proposed by the analysis for the topological characteristics of power network. According to the changes on the characteristics of topological and operation for the power network splitting, the simplifying method in network topology for power system is proposed forming the simplified topological model of grid. According to the simplified model, boundary conditions of proper strategies for power network splitting are proposed, and the mathematical expression suitable for OBDD analysis is also proposed.Thirdly, a searching method based on OBDD for active splitting strategies of power system has been proposed, whose specific method and process are introduced in detail via simple example. Meanwhile, the one-to-one corresponding principle is also proposed between the original graph and simplified diagram. In addition, a time-based layered structure of the problem solving process is introduced to provide protection for practical application of the method. The simulation results show that the method proposed in this paper has a rather excellent performance in solving splitting issues of power network. Power system in extremely serious conditions can get proper splitting strategies in a very short time using this method, which is very helpful to keep the power system operating safely.