Research On Multi-source Joint Dispatching Of New Energy Power System Containing CSP Plant Based On Demand Response

China is gradually transforming its power system into a green and low-carbon energy governance,wind power,photovoltaic,concentrating solar power(CSP)and other renewable energy forms of power generation will gradually transition from alternative energy to the dominant position.Especially in northwest China where wind,solar and other renewable energy resources are abundant,"multi-source complementarity" has become the main feature of the local new energy power system.However,due to the comprehensive influence of technical and policy factors,such as high volatility of wind power and photovoltaic output,weak regulation capacity of power grid,low load level,and single pricing mechanism of power market,the phenomenon of wind abandoning and solar abandoning has become increasingly serious.In addition,in recent years,the proportion of wind power and photovoltaic power in the power system continues to increase,and the random fluctuation of renewable energy power generation makes it more difficult to adjust the peak of the power grid,and the contradiction between the dispatching foresight and the prediction accuracy of wind power and photovoltaic becomes more and more prominent.Under this background,how to improve or even upgrade the existing power system from both sides of the source load,so as to make it more flexible,and deal with the problem of peak load adjustment caused by the high proportion of renewable energy grid connection is particularly important.As a new form of renewable energy power generation using solar radiant heat energy,the concentrating solar power equipped with thermal energy storage(TES)has certain schedulable capacity,which can improve the flexibility of power system.The demand response mechanism can also indirectly improve the flexibility of the power system by utilizing market factors and coordinating from the load side.Therefore,it is worth studying how to dispatch all kinds of power output in renewable energy high-permeability power system and how to minimize the cost of system comprehensive dispatching through source load coordination on the basis of ensuring the safe operation of power grid.In this paper,the response characteristics of different demand response mechanisms are analyzed to clarify the different applicable scenarios of various demand response mechanisms.Then,based on the multi-source complementary characteristics of the source side renewable energy,the output characteristics of wind power,photovoltaic power and concentrating solar power are analyzed,and the basic structure,classification,time-shift characteristics of energy and flexible scheduling characteristics of the concentrating solar power are expounded.After that,the fluctuation characteristics and multi-source complementary characteristics of renewable energy are analyzed.By analyzing the characteristics on both sides of the source load,it lays a theoretical foundation for the subsequent coordinated scheduling of source load.Secondly,optimal dispatch about concentrating solar power,price demand response and wind power are integrated,and the concentrating solar power is scheduled to provide backup for wind power prediction errors.Aiming at the lowest comprehensive dispatching cost of the system,and taking into account the uncertainty of the price demand response and the prediction error of wind power,a dispatching model considering the price demand response and the participation of concentrating solar power in wind power consumption was constructed.The results of the example show that the price demand response and the participation of the CSP station in the optimal dispatching can make up for the shortage of the anti-peak-load characteristics of wind power.Through the coordinated dispatching on both sides of the source load to reduce the peak-load load,the capacity of the system to absorb wind power and the comprehensive dispatching cost can be improved.Finally,a multi-source power system stochastic unit combination economic optimization scheduling model based on flexible output scheduling of CSP plant is constructed,and the price-based demand response and incentived-based demand response mechanisms are introduced into the model.This model aims at the comprehensive cost optimization under multiple scenarios,and takes into account the operating cost,demand response cost,renewable energy power abandoning penalty cost and system load cutting penalty cost of various types of units while taking into account the diversity of scenarios.Numerical example results show that the CSP plants take advantage of the power supply side adjustment flexible advantage can compensate for wind power,photovoltaic and other renewable energy prediction error is bigger,implementation to renewable energy(CSP)to promote renewable energy(wind power,photovoltaic).Introducing the load-side demand response mechanism into the renewable energy high-permeability power system can also effectively alleviate the imbalance of power supply and demand.