Research On Optimization And Coordination Of Electricity Supply Chain In Market Environment

With the gradual deepening of China's electricity system and the initial formation of the electricity market, electricity supply chain node enterprises will become the real competitor of electric market, especially the power generation enterprises, fuel supply enterprises, which bears the optimization responsibility of the entire electricity supply chain. The optimization and coordination of electricity supply chain in market environment means that, the optimization and coordination strategies of node enterprises is established, which is based on the communication and collaboration among node enterprises, the purpose of which is in order to maximize its own profit and achieve the optimal performance of electricity supply chain also. In this paper, methods of research on the optimization and coordination of general merchandise is reviewed comprehensively. On this basis, optimization and coordination of electricity supply chain with the constraints of electricity transmission network is investigated systemically, which according as game theory and nonlinear complementarity method.Power generation enterprises is an important node in the supply chain, which profiting from providing users with power. Strategic alliance of power group is established which is constituted by a number of power generation enterprises. For the purpose of effectively avoiding the risk of uncertainty of contract power. In the condition that coexisting with electricity futures contract market and spot market, model of power groups'non-inferior Nash equilibrium is proposed, which is based on the supply function model and transmission network constraints. With nonlinear complementarity method to solve the problem, combined with 3 node electricity market example under the circumstances that congestion and non-congestion of transmission network, the impact on optimal strategy and profit of power group is analysised which under the contract market circumstance.Electricity supply chain with the character of close coupling, research on optimization among power groups is not enough, because the process and relationship of each node enterprise can't be described clearly. So the electricity supply chain optimization and coordination is discussed deeply. Combined with fuel supply enterprises, coordination model of electricity supply chain based on quantity discount contract is proposed. The model makes the rational decision-making of individual members in the supply chain to achieve the optimal overall performance. With satisfying the power transmission network constraints, the model couples the optimal decision-making of fuel supply enterprises, power generation enterprises, customers and independent system operator by the quantity discount contracts of fuel procurement prices. Mathematically, it is represented by the multi-layer optimization with the equality and inequality constraints. By using the non-linear complementary function method to solve the model. Under the case of transmission network congestion and non-congestion, through the 14 node example to analysis, the result indicate that althought quantity discount contract can coordinate electricity supply chain effectively, but their maximum benefit can't be achieved at the same time, because the best overall performance should be achieved by one node to sacrifice its own interests.Because the node's maximum benefit can't be achieved when the best overall performance of supply chain is achieved, the imperfection is caused by quantity discount contract, so the situation must be changed. On this basis, with satisfying the electricity transmission network constraints, revenue sharing contract model of the individual optimal decision-making of power generation enterprises and fuel supply enterprises is proprosed, and electricity supply chain joint decision-making model with no revenue sharing contract is put forward too, as well as the market clearing optimization decision-making model. By using the non-linear complementary function method to solve the problem above. Wth the 3 node example power market to analysis, the result shows that the revenue sharing contract can reallocate between electricity and fuel enterprises'profits, and coordination of electricity supply chain is achieved under revenue sharing contract.