A Cooperative Game Theory Based Coordinated Dispatching Model For Distribution System And Virtual Power Plants

The distributed generation, especially the renewable energy sources have the advantages such as low pollution, high efficiency, and develop rapidly in recent years. However, the characteristics of randomness, variability and intermittence of the renewable energy sources lead to the problems of high cost and difficult management. Along with the increasing of renewable energy sources penetration, the coordinative schedule of distributed generation and distribution system has important practical significance. In this paper, mainly considering the coordinated dispatching for distribution system and virtual power plants, and based on the ideas and methods of cooperative game theory, the economical dispatch of virtual power plant and distribution utility is researched and the coordinated dispatch of virtual power plant and distributed system is analyzed as follow.Considering the economical dispatch problem in this paper, wind and PV output uncertainties are described by typical scenarios with probability information produced by scenario generation and reduction techniques. Based on the cooperative game theory, virtual power plant individual schedule model and virtual power plant/distribution utility coordinative schedule model are established to analyze cooperative space and profit allocation problem. The real date of a demonstration project for distributed renewable energy generation and the load curves is used for case study. The results show that factors such as output prediction accuracies, load demand and reserve price have directly effects on the cooperative space and profit allocation. The quantitative analysis can be used by VPPs and a distribution utility for cooperative negotiation and capacity allocation.Considering the coordinated dispatch problem in this paper, the first dispatch rights of renewable energy generations are taken into account into the basic unit commitment of a distribution system with virtual power plants (VPP). According to the VPP exercises the first dispatch right or not, two unit commitment models are proposed. The operation costs of the distribution system is reduced a lot when the interaction between VPPs and the distribution system are considered. The incomes and costs are reallocated based on cooperative game theory. The data of a demonstration project for distributed renewable energy generators is used for case study. The results illustrate that factors such as power generation structure, load demand, wind output prediction accuracy, renewable energy generation penetration and number of VPPs have directly effects on the cooperative space and profit allocation for a distribution system with VPPs. The quantitative analysis can be used by VPPs and a distribution system for cooperative negotiation and generation planning.