Research On Market Power In Electricity Market Under The Background Of The Bilateral Competition

Since the promulgation of " Zhongfa No.9 ",the electricity retail market has been liberalized,in which case the multiplex power sellers broke the single-buyer market model and the market environment of bilateral competition between generating and selling sides has been gradually formed.In the initial stage of the construction and operation of the electricity retail market,market participants often make use of the loopholes of the market mechanism to implement the market power they own,in which case he stable operation of the power market is disrupted.This paper has targeted to research on the market power in the bilateral competition,which has very important theoretical and practical reference value.Based on the review and summary of the measurement indicators of market power in the electricity market,from three aspects of the overall situation assessment of power market based on S-C-P framework,the market power of generators and retailers,then a relatively complete system of evaluation index of market power is put forward.In assessing the market structure,a new index that Buyer Counter Index is proposed innovatively to measure the buyer's countervailing power against the upstream generators.In assessing the bidding behavior of market participants,taking into account the market model of block bidding,a capacity-price disturbance index is proposed to analyze the relationship between the block price and capacity,and then to reflect the rationality of their bidding behavior.Secondly,based on the long-term electricity trading CFD market,this paper establishes the Cournot-based independent retailer's trading strategy model and the Stacklberg-based buyer alliance's trading strategy model,then solve and compare two models in order to quantitatively analyze the influence of buyer countervailing power owned by the buyer alliance on market price.At last Shapley-value theory is applied to distribute the profits of them and based on the result,the influence of buyer countervailing power on the profits is analyzed.An example is given to verify the validity of the model analysis.Finally,this paper takes the vertical integration of generators and retailers in the spot market as the analysis object,establishes the supply function model to simulate the bidding behavior of market participants in the wholesale market.Then equilibrium price before and after the vertical integration is solved.The graphical analysis method in comparative static analysis is applied to compare the wholesale price before and after vertical integration,on which the impact of vertical market is studied.Through a case study,the result of comparative analysis is more intuitively illustrated.