Research On Internal Bidding Mechanism Of Virtual Power Plant Based On Game Theory

Virtual power plant provides an effective means for the coordinated optimization operation of large-scale integration of distributed energy sources,which are usually not visible to the system and difficult to participate in the economic operation of power system and electricity market competition. At present, the study of virtual power plant is still in the theoretical and early stage of the pilot phase.Thses studies generally focus on the external overall characteristics and the overall market bidding mechanism of VPP. However, it ignores the internal coordination strategy, operation mechanism and internal individual interests analysis of DER.If there is no economic incentives, especially when the internal DER of virtual power plant belong to different investment main body, it is difficult to truly realize centralized scheduling and complementary operation of VPP. Therefore, on the background of multi-investment virtual power plant, the technical characteristics of VPP is first analyzed in this paper. Diverse interests demands of different participants are emphatically analyzed. Then this paper systematically studies the suitable internal complementary operation of market mechanism for this kind of VPP. Based on the mechanism, the bidding model is put forward. The main contribution of this paper can be summarized as follows:First, virtual power plant is divided into different types according to the different functions, investment bodies, and control structure. The scene we study is for multi-investment virtual power plant which adopts the distributed control structure.On this basis, the internal market mechanism for the virtual power plants is presented in this paper, according to the existing new energy policies as well as the core concept of "aggregation" "complementary" characteristics. Then this paper analyzes the difference between this internal market mechanism and the external power market mechanism Furthermore, this paper proves the feasibility of this mechanism from the benefits all parties can obtain.Second, based on this market mechanism and market rules,this paper establishes the bidding models for a variety of controllable DER involved in internal reserve market for obtaining maximum profit. The bidding model contains two uncertainty of random and fuzzy variables considering the initial condition of lack of information in the early market.It provides a more reasonable method for constructing power generation company to select the optimal bidding strategies.Furthermore, in view that the model contains both the characteristics of the fuzzy variables and random variables, this paper puts forward a kind of solving method combined with credible theory and random fuzzy simulation technology.It make the model simplified.Finally, a further study on the market mechanism and the bidding model is implemented by selecting a multi-investment virtual power plant as an example. The analysis of how the different market parameters change effects on each DER bidding strategy and the influence of market equilibrium is made. And then this model is compared with non-market centralized scheduling model. The results show the rationality of the market mechanism and the effectiveness of the bidding model.This paper provides suggestions about the virtual power plant complementary mechanism.