Research On Operation Strategy And Mechanism Of Distribution Network In A High Proportion Of Clean Energy

With the crisis of energy and environment growing heavily,the energy consumption patterns that coal,petroleum and other fossil energy sources as primary energy being converted into electricity need to be changed urgently.Driven by these external causes,it will become an irresistible trend in the future development of power grids that high proportion of clean energy will be converted into electricity and access to the grid as a primary energy.However,the large scale accessing of clean energy will bring huge influence to the grid pattern,networking configuration and all aspects of the power grid due to its own characteristics.In this thesis,the operation strategy and mechanism of distribution network in a high proportion of clean energy are researched based on the analysis of internal and external causes which driving development of the grid.Firstly,the necessity of clean energy participating in the power market is realised through the analysis of evolution mechanism of power grid operation mechanism and operation strategy in our country.Considering features of clean energy,the MAS-based trade model of distribution network power market is proposed and then analysed.Because bidding power of clean energy is intermittent,spot transactions are adopted in this thesis.Secondly,the equilibrium model is formulated as a stochastic equilibrium problem subject to equilibrium constraints(EPEC).The problem is based on a Stackelberg game where the generating companies optimize their strategic bids anticipating the solution of distribution network power market clearing.A finite strategy approach both in prices and quantities is applied to transform the nonlinear and nonconvex set of Nash inequalities into a mixed integer linear problem(MILP).A case study illustrates the methodology and provide theoretical basis for the bidding strategies of distribution network.Thirdly,economic dispatch among different generators including clean energy generators is discussed once the generation company has obtained its bidding power.At the same time,based on understanding the characteristics and constraints of every kind of clean energy generation,mathematical model of economic dispatch in the distribution network is proposed.By using the model to analyse an economic dispatch case respectively with particle swarm optimization(PSO)algorithm and combination of tabu search and invasive weed optimization(TSIWO)algorithm,we obtain the solution and compare the advantages and disadvantages between two algorithms.Finally,based on the above research,a perfect solution that all the participators among distribution network power market expected to maximize their economic benefits is obtained.