Optimal Scheduling Of Integrated Energy Systems For Photovoltaic Thermal Power Plants And Flexible Carbon Capture Power Plants

Under the promotion of China’s "dual carbon" goal,the low-carbon development of the power industry is facing enormous challenges,and renewable energy generation represented by wind and solar power is rapidly developing.Affected by the intermittent,fluctuating and uncertain output of new energy,its large-scale grid connection aggravates the pressure of system peak shaving,and the problem of wind abandonment is increasingly prominent due to the limited peak shaving capacity of Cogeneration(CHP)units in winter heating period.Thermal power units can flexibly cooperate with new energy output to a certain extent,but their regulating capacity is limited and their carbon emissions are high.Concentrated Solar Power(CSP)is an emerging renewable energy generation technology.Its thermal energy storage(TES)device provides a certain degree of schedulability for solar thermal power generation,and its steam turbine can quickly adjust its output.Its flexible regulation characteristics have significant advantages in promoting the consumption of new energy;Transforming traditional thermal power units into carbon capture units is one of the important measures to promote the achievement of the "dual carbon" goal;Combining the regulation characteristics of the two in the integrated energy system can achieve the goal of promoting new energy consumption and achieving low-carbon emission reduction under the premise of the lowest system operating cost.The specific research contents of this paper are as follows:First of all,eight different operation modes are obtained by applying the operation principle of the photo thermal power station,the heating principle of the photo thermal power station in collaboration with the Cogeneration unit is expounded,the role of the photo thermal power station with heat storage device in realizing energy time shift is explored,and the internal energy flow relationship between the electric heater(EH)and the joint energy supply of the photo thermal power station is further abstracted and a mathematical model is established.Secondly,traditional thermal power units were transformed into carbon capture units.Based on the analysis of the structure and operating principles of carbon capture units,the relationship between the total output power,capture energy consumption,and net output power of carbon capture power plants was studied.The model of carbon capture power plants under different operating modes was established,with a focus on analyzing the role of comprehensive and flexible carbon capture power plants in promoting new energy consumption and reducing carbon emissions.Next,the load side demand response is introduced into the system optimization scheduling model,utilizing flexible loads to participate in low-carbon operation,smoothing the load output curve,optimizing the system’s rotating reserve allocation plan,breaking the CHP unit’s "heat to electricity" working mode,making room for more wind power grid connection at night,and suppressing the entire system’s carbon emissions.Finally,in order to promote the substitution of electricity and low-carbon development,with the goal of minimizing the total cost of the system,an optimized scheduling model for the electric heating comprehensive energy system including photothermal power plants and flexible carbon capture power plants was established.Taking into account factors such as operating costs of each unit and system power flow constraints,the model was solved using CPLEX optimization software.In the source load coordinated economic dispatch model of the solar thermal electric integrated energy system,the example verifies that the load side electric demand response cooperates with the source side unit in multimode heating,which can achieve the purpose of more large-scale wind power consumption at night and reducing the total output of coal fired units throughout the dispatch cycle,thus inhibiting carbon emissions;In the multi-source joint scheduling model of solar thermal power plant and carbon capture power plant,the power generation characteristics of solar thermal power station and carbon capture power plant are combined,and a joint scheduling model of the two is established.Through the comparative analysis of different operation scenarios in the calculation example,it is verified that the cooperation of solar thermal power plant and carbon capture power plant can improve the flexibility of system scheduling,to a certain extent,it can also resist the fluctuation of wind power output,and has advantages in reducing system carbon emissions and improving new energy consumption.