Research On Optimal Dispatching Of Integrated Energy System Considering Low Carbon Characteristics And New Energy Consumption

In the context of energy depletion and the increasingly serious greenhouse effect,the development of “arbon peak and carbon neutral” was proposed in China,which indicates the direction for the green development of integrated energy systems.With the advantage of clean and carbon-free power generation,new energy has become the preferred energy form for the double carbon target.However,the randomness of new energy output will also cause large-scale wind and photovoltaic curtailment,which will increase the difficulty of grid-connected and dispatching.At the same time,the “determining electricity by heat”operation mode of integrated energy system further limits the consumption of new energy.Electrical and thermal power demand response can decouple the electro-thermal coupling based on peak-cutting and valley-filling on load side.As a source-side low-carbon retrofit technology,carbon capture can not only reduce the overall carbon emissions of the system,but also improve the deep peak-shaving capability of thermal power units,and provide reserve capacity for electro-thermal coupling and new energy consumption.Based on the above context,this thesis studies the optimal dispatching of electro-thermal coupling integrated energy system considering low-carbon characteristics and new energy consumption.The specific work is as follows:(1)Based on the source-load characteristics of the integrated energy system,the peak-shaving and valley-filling characteristics of the electrical and thermal power demand response mechanism on source side are explored.The flexible peak-shaving characteristics of the load-side carbon capture power plant and the electric heating unit participating in the new energy consumption are analyzed.The electro-thermal decoupling characteristics of heating equipment and thermal energy demand response are studied.The coordinated operation mechanism of resources is proposed to provide support for low-carbon economic dispatching of integrated energy system.(2)On the basis of reducing the fluctuation of electric load by electricity price-based demand response and electrical incentive demand response,the thermal incentive demand response resources are coordinated according to the insensitive interval of user temperature comfort degree,and the source-load interaction of the system is improved by the peak-shaving and valley-filling of electrical and thermal load.Based on the demand response adjustment load curve,an optimal dispatching model of integrated energy system considering the electrical and thermal power demand response of temperature comfort and carbon capture power plant is established.The deep peak-shaving capability of carbon capture power plant is used to decouple the constraint of “determining electricity by heat”,which further improves the reserve space of the system for new energy grid connection and ensures the stable operation of the system.(3)Based on the above research,the multi-time scale electrical and thermal power demand response model of integrated energy system based on optimal consumption of new energy is established.Under the load adjustment of day-ahead,intra-day and real-time stages,a multi-time scale optimal dispatching model of integrated energy system with source-load coordination is constructed to optimize load distribution and unit output plan.Meanwhile,the flue gas split ratio of carbon capture power plant is set as a floating value.At different time scales,the flexible peak-shaving characteristics of carbon capture power plants are deeply explored through carbon capture energy consumption,so as to eliminate the unreasonable dispatching plan caused by new energy prediction errors,which realize flexible peak-shaving and low-carbon operation under the electro-thermal coupling of integrated energy system.