Research On Multi-time Scale Source-load Coordinated Dispatching Method Of Power System Containing CSP-Wind Power

As a kind of sanitary energy,wind power plays an actual vital role in our country’s energy green transition.However,affected by issues such as high volatility of wind power output,weak regulation ability of power network,and lack of demand response(DR)mechanisms on the load side,the northwest region which has large wind power installed capacity has high level of wind curtailment.In addition,due to the lack of fast-response power supplies in the power system,and wind power production has the peculiarity that the shorter the forecast time scale,the higher the forecast accurateness,which makes the formulation of massive wind power combination power system operation plans facing huge challenges.In the above context,the study of source-load coordination and multi-time-scale scheduling strategy can not only improve the elasticity of massive wind power combination power system scheduling,but also use the peculiarity of wind power output prediction information and time-scale correlation to optimize the scheduling results.This method is of great significance to solve the power system peak shaving problem caused by massive wind power combination.As a form of solar power generation,the concentrating solar power(CSP)equipped with thermal energy storage(TES)and fast response capabilities has certain schedulable capacity,which can improve the flexibility of power system.Therefore,scheduling plans can be made in a shorter time scale,and the adjustment capabilities of system can be improved.At the same time,the DR mechanism enables the grid scheduling department to adjust the load demand according to the action of the power system.And,it can also be used as a means of peak regulation to advance the elasticity of electric system dispatch.In summary,it is of real meaning to study how to coordinate and schedule the output of each power source and the response of demand-side resources in a electric system containing CSP and wind power under multiple time scales,so as to reduce the system scheduling cost while ensuring the system’s ability to consume wind energy.Firstly,based on the analysis of the operation mechanism of CSP and wind power,this paper considers the use of electric heating devices to convert the excess wind into thermal energy and store it in the TES of the CSP station to form a combined CSP-wind power generation system.And this paper builds an optimal dispatch model for the combined power generation system.Secondly,on the basis of the combined power generation system,this paper constructs a day-ahead dispatch model of the combined CSP-wind power generation system that takes into account the price-based demand response by analyzing and introducing demand response related mechanisms.This model considers the effect of peak shaving and valley filling by adjusting the corresponding demand response resources on the load side to reduce the level of wind curtailment in the system.Finally,this paper takes into account the multi-time-scale response characteristics of the adjustable resources on both sides of the source and load,gives a multi-time-scale scheduling framework for the power system with CSP and wind power,and constructs a multi-time scale source-charge harmonized dispatching model of power system including CSP and wind power.The results display the CSP plants have good energy time-shifting peculiarity and scheduling flexibility.And the system’s capability of consume wind power can be improved by rationally dispatching the output of the CSP station.By this method,it can provide a certain spinning reserve capacity for the system.At the same time,coordinated scheduling with multiple time scales can make full use of load-side resources and the response capabilities of CSP stations and enable the system to formulate more reasonable scheduling plans based on more refined forecast data.