Research On Low-carbon Economic Dispatch Of Integrated Energy System With Carbon Capture Power Plants Considering Generalized Electric Heating Demand Response

In order to cope with the new situation and new tasks brought by the carbon peak and carbon neutral targets,the 14 th Five-Year Plan puts the promotion of low-carbon energy transformation in a prominent position.The development of multi-energy coupling integrated energy system and carbon capture and storage technology provides a key means to achieve low carbon at the "source" side of the power system.At the same time,demand-side response as a flexible resource has a deeper potential for low carbon in the "load" side of the power system.At present,in the largescale new energy grid-connected environment,thermal power generation units are still the main power generation equipment in the power system due to their flexible power output,stable and reliable operation,and will consume a large amount of fossil energy in the power generation process,resulting in high carbon dioxide emissions in the power system.In addition,the problem of insufficient carbon capture level of carbon capture power plants,the restriction of CHP units to "power determined by heat",and the problem of wind and light abandonment also limit the further reduction of carbon emissions of the power system.Starting from the macro and global levels of the construction of the integrated energy system,and from the micro technical analysis of the low-carbon transformation of the coal-fired units combined with carbon capture,utilization and storage technology,this paper proposes a coupling coal power and new energy system,and excavates its source-charge coordinated low-carbon dispatching mechanism from the mesoscopic level of the power system dispatching operation of source-charge coordination;Finally,the unit output plan is formulated with the goal of optimizing the total cost of system operation.First of all,this paper analyzes the operation mechanism of the electric-gas-thermal integrated energy system,mainly elaborates the electric-gas-thermal multi-energy coupling transformation mechanism,and models the multi-energy coupling equipment.At the same time,based on the energy flow characteristics of the carbon capture power plant,the dispatching model of the carbon capture power plant is established.In addition,the price-type demand response based on time-ofuse electricity price and the heat load demand response considering the fuzziness of heating comfort are modeled and analyzed,and the generalized electric heating demand response model is constructed considering its synergy with the electric-heat load regulation effect of waste heat recovery to deeply explore the load-side low carbon resources.Secondly,an integrated energy system operation framework considering carbon capture power plants is established,with the objective of minimizing the total cost of integrated energy system operation,including the optimal dispatch model of multi-energy coupling and complementary and carbon capture power plants,to enhance the low carbon of the power system from the source side.The model adopts a carbon trading environment,aims to increase the output of low-carbon units and reduce the output of high-carbon units,and applies a combined carbon capture-electricity-to-gas operation model to reduce the cost of outsourcing high-purity carbon dioxide from electric-to-gas equipment.The calculation results show that building an integrated electricity-gas-thermal energy system at the source side and equipping thermal power units with carbon capture equipment for low-carbon transformation promote the grid-connected consumption of new energy sources,improve energy utilization,and effectively reduce the carbon dioxide emissions of the power system.Finally,considering that the above research has significantly reduced the carbon emissions in the integrated energy system,the carbon capture power plant has not always been at the highest carbon capture level,and its low carbon characteristics still need to be explored.Therefore,this paper further excavates the load side demand response resources,adjusts the peak shift characteristics of electric heating load through the generalized electric heating demand response,decouples the constraint of "power determined by heat" of CHP units,and constructs an optimal dispatch model considering the generalized electric heating demand response.This model increases the flexibility of the system by adjusting the peak stagger characteristics of the electric heating load and decoupling the constraint of "determining power by heat" of the CHP unit.The results show that the coordinated source-load scheduling can effectively improve the carbon capture level of carbon capture power plants and balance the economy and low carbon of the system.