Wind-solar Hybrid Generation System Pricing Mechanism Model And Bidding Strategy Under Electricity Market

With the promotion of electricity system reform in our country, there are more and more appeals for the participation of renewable energy power generation in power market, which proposes higher requirements on orderly competition and reasonable price mechanism in power market. Compared with traditional power technology,although renewable energy power generation has a lower marginal cost, it has a relatively high average cost on investment of unit capacity. Especially, it is very difficult for the Wind-Solar Hybrid Generation System to compete with traditional power technology because of the limitation of energy storage technique and the high cost.However, with the increasing progress in power technology, it is predictable that the investment and construction cost will inevitably decline gradually. With the increasing permeability of renewable energy power generation in power system, it is an unavoidable problem to make the Wind-Solar Hybrid Generation System participate in power market operation. Therefore, this article develops research on the participation of Wind-Solar Hybrid Generation System in power market competition, and conducts in-depth discussion on problems of the price formation mechanism of Wind-Solar Hybrid Generation System, the establishment of contribution model, the establishment of pricing mechanism, the price competition model of the joint participation of the system and thermal power, and the subsidized price.Firstly, based on Copula function and related theories, it conducts research on the method to utilize Copula function in analysis on contribution correlation of wind farm and photo voltaic plant, and establishes the joint probability distribution model for wind farm and PV power plant, and gives the computing method for contribution correlation of wind farm and PV power plant based on the joint contribution probability distribution model. In order to avoid the disadvantages of traditional Copula function when applied to engineering field such as poor accuracy, based on the mixed multi-element Copula function construction method, it proposes the improved Copula function construction method appropriate for the characteristics of the Wind-Solar Hybrid Generation System.It points out the structural form of mixed multi-element Copula function and the correlation of the environment parameters of the Wind-Solar Hybrid Generation System.According to the contribution model, it gives case analysis and draws the conclusion that this model has higher accuracy and practicability when compared with traditional construction method model.Secondly, it analyzes the cost composition of the Wind-Solar Hybrid Generation System, and determines the cost part directly corresponding to contribution. Itdetermines the composition of pricing mechanism of the Wind-Solar Hybrid Generation System. Aiming at “indemnificatory purchase electric quantity”, and based on the composition of pricing mechanism, the pricing mechanism model of the Wind-Solar Hybrid Generation System is established by taking the minimum price expectation as the objective function, and taking the realistic conditions of the Wind-Solar Hybrid Generation System as the constraint conditions. It proposes the concept of power generation confidence probability. It applies the improved PSO to conduct case solution to the model. It verifies the reliability and reasonability of the model by making comparison with the computed result of the traditional determinacy pricing mechanism model.Thirdly, it conducts analysis on bid auction for the Wind-Solar Hybrid Generation System to participate in the competition in the power market. It establishes the Bayes game model by taking the participation of competitive tender of the Wind-Solar Hybrid Generation System based on the joint contribution probability distribution in Chapter Two. It derives the solution method for Bayes Nash Equilibrium(market equilibrium state) of the private information randomization during the participation of the Wind-Solar Hybrid Generation System. It also derives the optimum offer function and subsidy function during the bidding between the Wind-Solar Hybrid Generation System and thermal power. It conducts case analysis aiming at this model, and points out the rationality and reliability of the model.