Research On Optimal Dispatching And Operation Simulation Of Virtual Power Plant

With the rapid development of the global economy,the economic and environmental problems caused by traditional fossil energy are becoming more and more serious.In this context,countries all over the world are turning their attention to clean and renewable energy.Despite,renewable energy has the advantages of low power generation cost and low pollution degree,the defects of it cannot be ignored insignificant,such as unstable output and geographical dispersion.If it is directly integrated into the power grid and participates in the operation of the power grid,it will greatly affect the safety and stability of the power grid.As a special power plant without physical entity,virtual power plant integrates all kinds of distributed energy,including wind power generation units,solar power generation units,micro thermal power generation units and energy storage units.The participates of virtual power plant in the operation and dispatching of power grid effectively improves the economic benefit and utilization rate of renewable energy,and ensures the security and stability of power grid operation and dispatching.This thesis is divided into two parts.Firstly,the internal scheduling of virtual power plant is studied.A virtual power plant including wind power unit,solar power unit,micro thermal power unit and energy storage unit is established,and the demand response is incorporated into the virtual power plant.An internal optimal dispatching model of virtual power plant,which takes the minimum cost of virtual power plant and the maximum utilization of renewable energy as the objective function and considers the demand response with various constraints,is established.A differential optimization algorithm is proposed to analyze the calculation result of this model.The proposed model can effectively utilize the energy storage unit and demand response,and improve the utilization rate of wind energy and light energy in the virtual power plant under the premise of stable output.A numerical example is introduced to embody the effectiveness of the proposed model.Secondly,a system dynamics model based on the theory of system dynamics is established for the operation and development of virtual power plant.Futhermore,considering the policies of energy and environment in china,to analyze the impact of these policies to the development of virtual power plant operation,thess policies are regarded as a quantifiable variable in the proposed model.The development trend of virtual power plant under various energy policies is simulated and analyzed by changing the value of variables.The strength of the proposed model in this thesis is threefold.First,the optimal scheduling model of the virtual power plant constructed in this thesis innovatively adopts one of the objective functions of maximizing wind power utilization rate,and shows the role of the virtual power plant in promoting wind power consumption in the form of quantification.Secondly,the differential optimization algorithm of the heuristic algorithm is introduced to solve the optimal scheduling model of the virtual power plant.Thirdly,this thesis analyzes the development of virtual power plant under different policies based on system dynamics.