Optimization Of Thermal Storage And Peak Shaving Operation Of Wind Power System With Wind Power System Considering Peak Shaving Initiative

In order to achieve the goal of "carbon neutrality and carbon peaking",the form of power generation is gradually changing from fossil energy to renewable energy.The proportion of wind power in the energy structure continues to increase,the proportion of thermal power continues to decline,and the peak load regulation pressure of thermal power units increases.At the same time,the load peak-to-valley difference becomes larger year by year,and the antipeak shaving characteristics of wind power make the net load peak-valley difference after superposition of the load and wind power become larger,which puts forward higher requirements for the adjustment ability of thermal power units,and the depth of peak shaving thermal power units have poor economy and weak willingness to adjust peaks,resulting in unsatisfactory peak shaving effects.Energy storage can improve the flexible peak regulation capacity of the power system and reduce the regulation of thermal power units.Therefore,it is of great significance to study the combined peak shaving operation mode of thermal power units and energy storage and the methods to improve the enthusiasm of the combined thermal and storage system to participate in peak shaving.The paper firstly analyzes the influence of various loads on the peak regulation of the power grid,and analyzes the influence of wind power on the peak regulation of the power grid from the aspects of the randomness,volatility and anti-peak regulation characteristics of wind power.Through the analysis method of power grid peaking demand,the power grid peaking demand under different wind power penetration rates is calculated,and the following research work is derived from the peaking demand.Secondly,the peak-shaving operation process of thermal power units is analyzed,the carbon emission intensity model of thermal power units is established according to the coal consumption characteristics of units,and the operating cost model of thermal power units is introduced.In the process of peak shaving,the energy storage operation cost,aiming at the lowest total cost in the whole process of peak shaving operation,establishes an optimal operation model of thermal energy storage peak shaving considering carbon emission penalty and energy storage life loss.The calculation example results show that the coordinated peak shaving operation of thermal power and energy storage reduces the deep peak shaving power of thermal power units and effectively enhances the peak shaving capacity of the system.Considering carbon emission penalty is beneficial to improve wind power consumption and reduce system carbon emission,but with the increase of carbon emission penalty coefficient,the income of thermal power unit decreases accordingly.In addition,as the installed capacity of wind power increases,it will lead to an increase in the curtailment rate while reducing carbon emissions.Finally,on the basis of the above model,the thermal power unit and energy storage peakshaving initiative constraints are introduced,and a wind-fired storage operation optimization model considering the peak-shaving initiative is established.In the model,the thermal power unit considers its carbon emission penalty cost,operating cost,electricity sales revenue and peak shaving revenue,energy storage considers its life loss cost,peak shaving revenue and environmental benefits,wind power considers electricity sales revenue and peak shaving cost allocation,and optimizes with the goal of maximizing the total revenue of the system.The simulation results show that the model can take into account the interests of thermal storage and wind power,and is conducive to stimulating thermal power units and energy storage to actively participate in peak regulation and wind power consumption,and reduce system carbon emissions.