Research On Application Of Optimal Dispatching Of Virtual Power Plants Considering Uncertainty

As traditional fossil energy crises and environmental problems have become increasingly prominent in recent years,they have become a major constraint on the economic development of countries around the world,and higher requirements have been placed on the comprehensive utilization of energy.Renewable energy has been vigorously developed due to its advantages of clean,environmental protection and abundant reserves.However,renewable energy represented by wind power has the characteristics of randomness and intermittentness,and its access to the grid will give the grid operation safety and economy.Bring new challenges.Introduce a demand response mechanism(DR)to use demand-side resources to jointly participate in the economic dispatch of the power grid.In order to facilitate the management of uncertain demand-side resources and generation-side resources,the concept of virtual power plant(VPP)is proposed to break The boundary between the power generation side and the load side improves the reliability of power supply and reduces the operating cost of the power grid.In this paper,the starting point is to improve the grid-connected application of new energy under the background of smart grid,and under the premise of taking into account the related uncertainties,the application research of virtual power plant optimization dispatching is carried out.First,based on the uncertainty theory,the uncertainty in the virtual power plant is analyzed.Uncertainty widely exists in the load side and the power generation side.This paper analyzes the uncertainties in wind power and demand response in detail from the three aspects of randomness,ambiguity,and roughness,and proposes a description method of related uncertainties.Secondly,in view of the interruptible load of demand-side resources,the characteristics of interruptible load,contract,cost,benefit and other characteristics are introduced,and the realization process of interruptible load is proposed.Based on the concept of virtual power plant,considering the uncertainty of the total demand of interruptible loads,a virtual power plant optimization decision model that takes into account the composition of interruptible loads and reduces the uncertainty of total demand is established.The virtual power plant scheduling scheme obtained by minimizing the cost of interruptible loads can provide virtual output.Through the analysis of calculation examples,the interruptible load model that takes into account the uncertainty has the advantages of low economic cost and effective mobilization of users’ response enthusiasm.Furthermore,in view of the current situation that demand-side resources and generation-side resources jointly participate in grid operation dispatching,the incentive-based demand response secondary model and generation-side unit combinations are jointly involved in the optimal dispatching of integrated power generation and utilization virtual power plants,and improved particles are used.The group algorithm optimizes the model.The results show that when the model takes into account the uncertainty,it can effectively reduce the amount of wind curtailment and improve the absorbability of wind power;the utilization of demand-side resources can reduce the output of conventional energy,reduce the economic cost of grid operation,and optimize the resource allocation of virtual power plants.Greatly improve the reliability of power supply.