Transient Stability Distributed Simulation For Multi-Area Power System In Market Environment

Power market development and area-based subsystems interconnection willbring new power system security and stability issues. A new scheme forinterconnected power system transient stability distributed simulation was presented.System simulation was achieved by the cooperative computation of independentoperation subsystems on condition of nontransparent system parameters. The mainwork concentrated on the problems of distributed simulation algorithm presentation,simulation efficiency analysis and improvement and software analysis-design andimplementation.An algorithm for transient stability distributed simulation based on subsystemiteration was presented. The algorithm was adapted to the operation specialty ofinterconnected subsystems in power market environment. In the algorithm, a largepower system network was considered as comprising of a number of sub-networksconnected via branches known as cutting branches. The structure of subsystemcomputation and intercommunication was arranged by this configuration. Onlynecessary boundary information was communicated between neighbored subsystems.The algorithm has the potential for interconnected power systemelectromechanical-electromagnetical hybrid simulation.Three methods named as the Initial Value Estimation method, the InterfaceValue Adjustment method and the Interface Value Estimation method were proposedto improve the distributed simulation efficiency of subsystem iteration algorithm.With the methods, simulation system convergence property was improved and thetotal communication times for system network solution were decreased, then thesimulation efficiency was increased. The Interface Value Estimation method inconjunction with the Initial Value Estimation method could induce a stable andprodigious efficiency improvement for transient stability distributed simulation basedon subsystem iteration algorithm.Building a boundary bus system on the sub-networks was also an approach tosolve the distributed network equations and to implement the distributed systemsimulation. In the algorithm, an abstract boundary bus system was built based on thelinkage information of sub-networks. In system simulation, the subsystems were peerto peer and the parameters between them were nontransparent. The algorithm wasefficiency preponderant in multi-area power system electromechanical distributedsimulation.The OOT analysis and design methods were investigated for transient stabilitydistributed simulation software. By the thoughtway of OOT, the multi-area powersystem was modeled as multi objects of a subsystem class and the objects wereassociated according to the linkage of sub-networks. Transient stability distributedsimulation is to implement the parallel solution of the multi objects. The proposedsoftware debugging and testing technique was a way for parallel transient stabilitysimulation software development and validity examination.The study of interconnected multi-area power system distributed simulation inthis dissertation is to exploit reliable and high performance simulation algorithmsaccording to the operation and management particularity. The studies will supplyeffective tools for reliable operation in power market environment.