Research On Low Carbon Economic Dispatching Of Power System Considering The Flexibility Of Source And Load Double Terminal

In recent years,the problems of environmental pollution and global extreme climate have become increasingly prominent.The supply-side reform of energy based on clean energy such as wind and light has become a common consensus,and the proportion of new energy access in the power grid has been increasing.Due to the uncertainty and intermittency of new energy output,a high proportion of renewable energy access faces difficulties in absorption,and the system’s peak regulating capacity is obviously insufficient.Therefore,the power system urgently needs to enhance the flexible capacity to adjust the load fluctuation,and fully tap the flexible adjustment potential of the system at both ends of the source load.Therefore,with the gradual improvement of the carbon trading market,it is of certain practical significance for low-carbon economic operation of the power system to study the flexible regulation of resources such as multi-type demand response,heat storage transformation of thermal power units and comprehensive flexible operation mode of carbon capture units.Starting from improving the flexibility of both sources and loads,this paper studies the low-carbon economy dispatching operation of the power system.The main contents are as follows:Firstly,this paper takes typical load types such as industrial load,commercial load,residential load and residential load as examples,establishes multi-type demand response mechanism according to various users’ sensitivity to electricity price and power consumption characteristics,and establishes improved TOU price and interruptible response model.Through the analysis of the operation mechanism of heat storage transformation,the corresponding mathematical model is established.At the same time,the coupling relationship between the operation characteristics of the carbon capture power plant and the energy flow of each unit under the comprehensive flexible operation mode is studied and the operation model is established.Based on this,the operating mechanism of reducing system carbon emissions by improving the flexibility of two-terminal source load is introduced,which lays a foundation for the study of lowcarbon scheduling including the flexibility of two-terminal source load.Then,the low-carbon economic dispatching problem of power system considering multi-type demand response and unit heat storage transformation is studied.The flexibility of the load side is fully explored,and the flexibility of the power side is enhanced by combining with the heat storage transformation technology of the unit.A low-carbon economic dispatching hierarchical model of the power system is constructed considering the multi-type demand response and the heat storage transformation of the unit.The upper layer constructs the constraint of peak-valley dynamic electricity price,aiming at load variance and demand response cost,while the lower layer aims at minimizing the total operating costs of the system,such as coal burning cost,start-stop cost,carbon trading cost,environmental protection tax cost and standby cost.Taking the improved 12-machine system as an example,the model and method proposed in this paper are applied to simulate the coordinated optimal scheduling considering the heat storage unit and the multi-type demand response.The results verify the effectiveness of the model.Finally,the low carbon economy dispatching problem considering dynamic electricity price and comprehensive flexible operation of carbon capture power plant is studied.The principle of time tripartite and power tripartite division of dynamic peaking and valley periods is analyzed,and a mathematical model is established.In order to elaborate the influence of carbon trading costs on power production decisions,a stepped carbon trading mechanism is introduced,and the model is built for the internalization of carbon capture power plants with comprehensive and flexible operation.A hierarchical low-carbon economic dispatching model of power system is constructed,which takes demand response cost and load variance as the target at the upper level,and takes into account the minimum comprehensive costs such as carbon capture solvent loss cost,carbon income,coal burning cost and start-stop cost at the lower level.Based on the example in Chapter 3,the rationality of the proposed model and method is verified.