Day-ahead Coordinated Optimal Dispatch Considering Wind Power Consumption And Deep Peak Shaving Of Thermal Power

Before the establishment of a sound power spot market system,peak shaving was still the main means to balance supply and demand and absorb wind power.As the proportion of new energy in the power system continues to increase,the consumption of renewable energy such as wind power has greatly increased the difficulty of system peak shaving.Unified scheduling of peak-shaving resources may cause units with deep peak-shaving capabilities to cause economic losses and environmental pollution that deviate from the cost,and it is difficult to ensure the fairness and enthusiasm of peak-shaving units.In order to achieve the "dual carbon goal" and promote the coordinated development of renewable energy and thermal power,it is urgent to straighten out the peak shaving dispatch relationship and explore a practical dispatch mode that takes into account the interests of all parties.This paper first analyzes the typical domestic and foreign dispatch operation modes,and mainly sorts out the three modes of economic dispatch,spot power market and cost-based power storage.After a comparative study of my country’s current dispatching models,it was found that the current centralized dispatching model and supporting compensation mechanism are difficult to reflect the differences in the interests of power generation groups,and the idea of improving the autonomy of power generation groups in optimized dispatching was put forward.Secondly,this paper conducts a detailed study on the peak-shaving characteristics and economics of thermal power units,including the peak-shaving process and capabilities of thermal power units,and the cost and compensation of peak-shaving power units.By quantifying the hidden costs of coal consumption,carbon emissions,and pollutant emissions in the peak shaving process of the units,the comprehensive peak shaving cost of thermal power units is obtained,so as to realize the rational allocation of peak shaving resources in optimized dispatch.Based on the above research foundation,this paper proposes a day-ahead scheduling model that coordinated centralized scheduling and power generation group independent scheduling.The day-ahead optimal scheduling is carried out in two stages:the first stage uses the centralized economic scheduling method to form a power generation plan with the lowest coal consumption in the system.The unit power generation plan obtains the total power generation plan of each group;in the second stage,each group keeps the total power generation plan unchanged,and optimizes internally with the goal of the lowest power generation cost of the group to reform the unit power generation plan.As independent stakeholders,each power generation group only incorporates factors such as unit differences,deep peak shaving,and load interaction into the 2-stage objectives to achieve internalization of external costs.Finally,the calculation example part is verified by the IEEE30 bus system.The coordinated optimal dispatch model proposed in this paper can effectively alleviate the peak shaving pressure of the unit,reduce the wind abandonment rate,and reduce the operating cost of the power generation group and the system,which is beneficial to promote the coordinated development of renewable energy and thermal power.