Research On Combined Heat And Power Operation Strategy Considering Wind Power Utilization

The energy structure in northern China is dominated by coal-fired power.However,in recent years,new energy sources such as wind power generation have brought a series of new challenges to power grid dispatching.The operation mode of CHP unit "heat-set" has restricted the overall adjustment capability of the power system,resulting in a large number of abandoned electricity,which has a serious impact on the safe operation of the power grid.It is difficult to cope with the randomization brought by large-scale wind power grid-connected.Sexuality,volatility,intermittent problems.From the perspective of joint coordination and dispatching of power system and thermal system,this paper carries out research on combined heat and power scheduling with consideration of wind power uncertainty.In this context,this paper focuses on the combined heat and power system consisting of wind power generation,cogeneration,electric boilers and heat storage devices.In order to improve the stability and economy of the system,the thermoelectric combined system considering heat reserve is studied.The simulation results show that the optimization strategy proposed in this paper is effective and economical.This paper has mainly completed the following aspects:Firstly,the main components of the combined heat and power system for wind power access are introduced,and each unit is analyzed and modeled.Firstly,by establishing the mathematical model of wind turbine power generation,the power generation characteristics of wind turbines and the impact of wind power access on the grid are analyzed,and the calculation method of spare capacity that wind power access system needs to set is given.Secondly,by analyzing the system structure of CHP unit and studying its operating characteristics and coal consumption characteristics,the feasibility of providing direct spare capacity of CHP units is further verified.Finally,the mathematical model of the thermal reserve unit in the combined heat and power system is established,and its operational characteristics are analyzed to pave the way for subsequent research and simulation.Secondly,it discusses the feasibility and superiority of the combined heat and power system considering heat reserve in dealing with wind power uncertainty.Firstly,the operation mode of the thermal reserve unit access system and the change of the CHP unit’s operating domain are analyzed.The thermal electrocoupling space of the CHP unit is quantitatively described.The spare part of the thermoelectric unit considering thermal reserve after thermal electrocoupling is discussed.The capacity is provided,and a spare capacity supply scheme for the thermal power unit considering the heat reserve is given.Then,the optimization model and constraints are established with the minimum operating cost of the system,and two scenarios are set for comparative analysis.Finally,verify by setting a study.Finally,a virtual power plant based(VPP)optimization operation strategy is proposed.Compared with the direct participation of thermal reserve in the third chapter,the virtual power plant participates in the power grid dispatching as a whole,and proposes its own response to wind power settings.The spare capacity strategy solves the problem of insufficient thermal power unit adjustment capability that may occur during the daily dispatch in Chapter 3.This chapter first sets up the VPP structure,and analyzes the system from four aspects:operation mode,power plan,spare capacity system and operation strategy.Secondly,the model is built with the maximum benefit of VPP in one scheduling cycle,and finally verified by the example.