Multi-angle Economic Analysis For Deep Peak Regulation Of Thermal Units With Large Scale Wind Power Connected Power System

The wind power output has characteristics of intermittency,randomness and counter peak regulation.The wind power integration enlarges system load difference between peak and valley,which makes the pressure of system peak regulation heavier.Due to high proportion of thermal power generation units and unreasonable structures of power supply,thermal power generation units are mainly responsible for the increased peak regulation tasks after integration of large-scale wind power.Along with the scale of wind power integration increasing,society increasingly cries for the deep peak regulation of thermal power generation units.However,by adopting the deep peak regulation,the wind power utilization will be increased when the benefits of thermal power plants will be decreased and social environmental costs will be increased.Therefore,under the condition of large-scale wind power integration,this paper aims at investigating the economy of the deep peak regulation of thermal power generation units from various aspects.Firstly,this paper investigates the common peak regulation modes of thermal power generation units and the common used peak regulation modes at home and abroad.The factors which influence the deep peak regulation abilities of thermal power generation units are analyzed from some technical aspects.Then,based on the operating conditions and the energy consumption characteristics,the peak regulation process can be classified into three stages,which are conventional peak regulation,deep peak regulation without oil and deep peak regulation with oil.The energy consumption cost models of peak regulation are proposed based on the different stages of thermal power generation units.The economic dispatch models of wind power priority are developed.Moreover,under the conditions of integration of large-scale wind power,the economy of dispatching schemes for the deep peak regulation of thermal power generation units are analyzed based on the sim ulation of typical 10-unit system from the aspects of thermal power enterprise,wind power enterprise and society.Finally,the coal consumption based energy efficiency model of power system is proposed from the benefits of economy,environment and society.Based on this model,the expect output based energy efficiency model of power system is proposed considering guidance of government as well as business position of state grid.According to the example simulation of a typical 10-unit system,the impacts of deep peak regulation of thermal power generation units on the energy efficiency of power system are analyzed,and the optimal energy efficiency point of deep peak regulation is obtained.The energy efficiencies of power system are analyzed quantificationally under different dispatching schemes,and many factors influencing the power system energy are obtained,which provides the basis for the subsequent deep research.The research results will provide references to make some related policies for the deep peak regulation of thermal power generation units.