Research On Flexible Resource Transactions Mechanism And Market Equilibrium In Electricity Spot Environment

The traditional market mechanism based on the controllable power plants is no longer completely adapted to the new power system with a high proportion of renewable energy penetrated.It is urgent to study a flexible resource transactions mechanism that can cope with the intermittent,volatility and random power generation of new energy,and to solve the shortage of flexible ramping capabilities and its pricing and apportionment problem.Simulation and calculation analysis are the prerequisites for the implementation of market mechanisms.By solving the equilibrium of the market,it is possible to predict the decision-making tendency of market entities and predict the overall situation of market,to provide rule-makers with an important basis for analysis and decision-making.Therefore,this article firstly outlines the basic principles of the electricity spot market,including the transaction organization and clearing process,the mathematical model of power generation distribution,and two equivalent methods for obtaining the locational marginal price,the dual theory method and the definition method,which lays the foundation for the following Chapters.Secondly,aiming at the problem of insufficient flexible ramping capabilities,a market framework with flexible resource transactions,clearing,and settlement and apportionment is proposed.Based on the probability distribution model and risk cost,a dynamic optimization method for flexible resource demand is proposed.A virtual bidding curve covering virtual price and amount is constructed to achieve reasonable pricing and compensation.Established a twostage real-time market clearing model and an apportionment model based on quantification of responsibility.Finally,the simulation results with random wind power samples show that the model can effectively improve the new energy utilization,reduce the overall cost,and reasonably compensate and allocate the opportunity cost of the units.In the last chapter,a two-level equilibrium model with the optimal decision-making of market entities and the optimal clearing of the ISO is constructed to solve the market equilibrium.MPEC is used to solve the equilibrium of a single oligopoly market while EPEC of a multi-oligopoly market equilibrium and both linearization process is proposed.Considering that the linearization process will lead to the loss of potential market equilibrium,a graphical method based on the optimal response curve(domain)is proposed to find the approximate range of the market equilibrium points(domain).A diagonalized collaborative calculation is proposed to solve the certain equilibrium point of the duopoly market,and it is proved that the steady state of market evolution is equivalent to the Nash equilibrium.Finally,examples are used to prove the effectiveness and robustness of the graphic method and collaborative calculation.