| How to adjust or improve the structure of electricity industry, to establish the electricity market according to the market rules and to organize the electricity production efficiently according to the units and electricity system characteristic, it is a timeless hotspot topic in the coming years. Specially for the generation-side market, the electric power suppliers should compete with and obtain the ideal output and prices through a rational market strategy against the possible of the monopolization situation in some areas. Toward the day-ahead (DA) market, it should be arranged rationally to the multi-intervals optimal scheduling of the unit commitment (UC) scheme and achieve the minimum cost (or profit maximization) based on the units features and electricity transmit system restrictions, combining the requirements of the power load curve and the spinning reserves in the corresponding interval, according to units start-up costs and price factor.In the point of view from the characteristic of the electricity power market, the elasticities model of the electricity power demand and the competition model of the oligopoly power suppliers from the theory of industrial organization and economic theory, the start-up costs are considered with the minimum cost-plus pricing model in this thesis. Toward the oligopoly supply market, this thesis proposed the oligopoly supply model, and the Oligopolistic Competition model considered unit bound and the Cournot-Nash equilibrium model which is based on the optimal reaction function. Toward the DA market, this thesis proposed the combined optimum model of unit commitment (UC) scheme considered synchronously the power/reserves, and given out the specific algorithm of "the dynamic programming based on decision tree". For the key models, the simulation computing combined with the units and load parameters of 10-100 system was been done in this thesis. It obtained the different output results based on different changing factors had been analyzed.The research works in this thesis are as follows:(1) The interval-based pricing method considered the start-up costsBased on a brief description of the features of the electricity market structure, the market models and the Oligopolistic Competition of the power supply side, the electricity price structure and its main factors are analyzed in this thesis, and the minimum cost-plus pricing model is proposed which considered the unit start-up costs. The calculation method is also discussed. The basic data and theoretical basis for the interval-based cost calculation and optimal pricing portfolio model for the DA market is provided in this thesis.(2)The supply function model of the power supply market and the analysis of the oligopoly equilibrium modelAccording to the analysis of the competition characteristic of the power supply market from the economic point of view, the oligopoly supply model is given, and the solving strategies of the optimal pricing function (supply functions) of the power suppliers is proved to be a one-dimension search problems in essence. Through analysis of the oligopoly equilibrium model, the monopoly pricing represent to be the inverse elasticity rule is known, that is, the oligopoly power suppliers implement the monopolization in the region which have elasticities of the demand, and its monopoly pricing is non-decreasing function of the marginal cost. Through the analysis of the oligopoly equilibrium model, the relationship of the quantity and price in oligopoly equilibrium model is linear, and between the Nash equilibrium and Bertrand equilibrium.(3)The analysis of the capacity withholding behavior of the oligopoly power suppliers The models of the influence about the elasticities of demand and supply to the capacity withholding behavior are presented respectively in this thesis. Applying this model, an important conclusion may be gotten: the supply elasticities is smaller, or the supply curve is more sloping, the possibility of the power suppliers' withholding capacity is greater. The elasticities of demand is smaller, the possibility of the power suppliers' withholding capacity is also greater. For the oligopoly power suppliers, after withholding a part of the capacity, the market share of the surplus capacity became bigger, the motivation to adopt a capacity withholding strategy also became stronger.(4) The influence of the elasticities of electricity power demand to the Cournot-Nash equilibrium model.For the study on the elasticities of electricity power demand, the effect factor of the elasticities of the electricity power demand is analyzed in this thesis at first, the elasticities model of the electricity power demand is set up. Focus on the Cournot-Nash equilibrium model and example which are based on the optimal reaction function, the affection of the elasticities of the electricity power demand to the Cournot-Nash equilibrium model is analyzed. The different degree of the influence of the demand elasticities to the Cournot-Nash equilibrium is compared with the equilibrium based on the marginal cost method. From the example data analysis, when the electricity power demand is elastic, the output and price of the oligopoly equilibrium are lower, otherwise, the monopoly will get higher income through higher output and price.(5) The unit commitment (UC) scheme optimum model of the DA market which considered the spinning reserves.Based on the unified market model, the idea of the unit commitment (UC) scheme optimum model of the DA market is studied in this thesis, which considered the spinning reserves. The probability of the reserve to be called in the consideration of the units constraints is analyzed. The specific affection of the price and capacity of the spinning reserve to the optimized results is discussed. A new feasible ideas and analysis to the unit commitment (UC) bidding and dispatching for the DA electricity power market is given. The research work in this thesis may provide a guide for the optimization of industrial organization in a macroscopic view, rational allocation of market share, and the necessary of improving the elasticities of electricity power demand. The theoretical basis and operation skill is described for the oligopoly power suppliers to use the market power rationally to participate in market competition, and to obtain maximum revenue by effective competition equilibrium model and the optimum market model.
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