Research On Coordinated Scheduling Strategy For Large-scale Energy Storage And High-permeability New Energy

With the maturity of new energy power generation technologies based on wind power and photovoltaic power,and gradually replacing traditional fossil energy with clean energy,it is an irresistible trend to increase wind power and photovoltaic power penetration.However,new energy sources such as wind power and photovoltaic power are affected by hydrological and climatic conditions,which are random and uncertain.At the same time,they are limited by the regulation and consumption capacity of the system.The large-scale grid-connected operation will cause threats for the safety and stability of the grid.The energy storage technology has unique advantages in dealing with the high-permeability new energy grid-connected consumption,especially the pumped storage technology with relatively mature technology,which has the advantages of rapid start-stop and large adjustment capacity.Therefore,in order to improve the system regulation ability,promote high-permeability wind power and photovoltaic power grid-connected consumption,this paper studies the coordinated scheduling strategy of pumped storage and high-permeability wind power and photovoltaic power.The specific research work is as follows:(1)Based on the establishment of mathematical models of wind power and photovolta ic power generation,the characteristics of wind power,photovoltaic power output and the operation characteristics of pumped storage are analyzed,and the permeability of wind power and photovoltaic power is divided into two levels: slightly higher and higher.The principle of pumped storage power station participating in system scheduling under high-permeability wind power and photovoltaic power is determined.(2)Wind power,photovoltaic power and pumped storage are bundled to form virtual power supply to participate in market dispatching operation,and a coordinated scheduling strategy for wind power,photovoltaic power and pumped storage virtual power with uncertainty is proposed.Based on the prediction scene method to consider the uncertainty of wind power and photovoltaic power output,the optimal discrete scene generation technology is used to obtain the scenes of wind power and photovoltaic power output,and the scene reduction technology based on the probability distance is used to reduce the scenes to obtain typical scenes.The wind power,photovoltaic power and pumped storage virtual power coordinated scheduling model is established with the goal of maximizing the revenue of wind power,photovoltaic power and pumped storage virtual power supply.The coordinated scheduling results of wind power,photovoltaic power and pumped storage virtual power supply are simulated and analyzed by a specific example.The influence of grid-connected electricity price and spare price on scheduling results under different scheduling modes is discussed,and the effectiveness of the proposed coordinated scheduling strategy is verified.(3)On the basis of integrating the dispatching resources of combined electric-thermal system including heat storage devices,pumped storage and flexible loads,the influence of pumped storage and flexible loads on the dispatching operation of high permeability wind power and photovoltaic power is analyzed,and a multi-source coordinated dispatching strategy of the combined electric-thermal system based on demand response is proposed,and a dispatching model of multi-type flexible loads is established.A multi-source coordinated dispatching model of combined electric-thermal system based on demand response is established with the objective of maximizing wind and solar energy consumption and minimizing system operation cost.The model is solved by multi-objective harmony search algorithm,and the optimal compromise solution is determined based on the method of fuzzy membership function.Combined with IEEE30-bus system,the influence of pumped storage with different installed capacity and demand response on unit commitment results is simulated and analyzed.The influence of multi-source coordinated dispatching of combined electric-thermal system on wind power and photovoltaic power grid-connected absorption and system operation cost under different scenarios is discussed.The positive effect of the proposed coordinated dispatching strategy on promoting wind power absorption and economic operation of the system is verified.