Study On Depth And Economic Benefits Of Thermal Power Flexibility Transformation To Promote Wind Power Consumption

With the increasing penetration of wind power,the peak regulation pressure is increasingly prominent.Especially during the heating season in the "Three North" area,the "ordering power by heat" operation mode of the cogeneration units further increases the peak regulation pressure of the system and results in abandoning the wind and limiting wind power.In this paper,the thermal power flexibility transformation is taken as a solution to alleviate the peak regulation pressure of the system and improve the level of wind power consumption,and the depth and economic benefits of thermal power flexibility transformation is studied.The main work and research results of this paper include:(1)The chronological simulation method is used to calculate the capacity of wind power consumption.The power structure,load characteristics and wind power characteristics of a regional power grid are analyzed,and the wind power consumption capacity of the regional power grid during the heating season is quantified by the method of chronological simulation.The analysis results show that the regional power grid has huge peak regulation pressure during the heating season and the capacity of wind power consumption is limited.The research results show that the regional power grid has huge peak regulation pressure during the heating season and the capacity of wind power consumption is limited.(2)Probabilistic optimal power flow(P-OPF)is used to determine the priority and depth of the thermal power flexibility transformation.Correlated samples are generated by means of Nataf inverse transformation.Then calculate the optimal power flow(OPF)for sample points,and determine the priority of thermal power flexibility transformation by probabilistic statistical analysis of the unit output results.The output constraint conditions of the unit are modified accordingly.By solving the P-OPF again,the depth of the thermal power flexibility transformation is determined.Taking a city power grid as an example,the priority and depth of thermal power flexibility transformation under different wind power scenarios are determined.The calculation results can provide the data and scene basis for the study of the economic benefits of the thermal power flexibility transformation in this area.(3)Net present value(NPV)is used to evaluate the the economic benefit of thermal power flexibility transformation.The process of the thermal power unit to participate in peaking regulation is analyzed.And the cost of thermal power flexibility transformation and the peak regulation benefits of the thermal power units under different peak regulation compensation modes are analyzed.The method of NPV is used to calculate the cost recovery time of the unit in order to evaluate the economic benefits of the thermal power flexibility transformation.The economic benefits of the thermal power flexibility transformation under different scenes in the example system is analyzed and evaluated.According to the assessment results,the government related departments,power grid companies,and power generation companies are proposed accordingly to improve the level of wind power consumption and the enthusiasm of the thermal power plant to participate in the flexibility transformation.