Optimal Dispatch Of Novel Power System Considering The Constraints Of Regional Atmospheric Environment

The basic idea of achieving carbon neutrality is building a novel power system with new energy sources as the main source and coal power as a supplement.At present,the construction of novel power system is facing many problems.This study focuses on two aspects:First,although coal-fired thermal power has become auxiliary energy,its emissions of carbon dioxide and pollutants such as SO₂,NO_x,PM,etc.still need to be further controlled;second,after the large-scale of new energy sources connect to power grid and coal-fired thermal power gradually shut down,the power generation capacity on the power supply side cannot be controlled,which means that the traditional“source moves with the load”.The technical means cannot be applied to the novel power system.For this reason,this dissertation takes the concentration of carbon dioxide and pollutants emitted from coal-fired units as the control object,and realizes refined and differentiated management of coal power emission reduction;hydrogen energy will support the integration of ultra-large-scale and ultra-high proportion renewable energy connected to power system;on this basis,the optimal dispatching strategy of the novel power system will realize the reasonable allocation of resources on the power supply side,and provide support for the construction of the novel power system.Firstly,in order to refine the impact of coal-fired unit emissions on the atmospheric environment,gaussian plume model is used to model the spatial and temporal distribution of CO₂ and pollutants emitted from coal-fired units in three dimensions:time,space and concentration.The comparison of the two dispatching results illustrates the rationality of using the emission concentration of coal-fired units as an indicator,and analyzes the necessity of introducing it into the power dispatching strategy.Secondly,in order to clarify the application scenarios of the dispatch plan,this dissertation establish a novel power system architecture supported by hydrogen energy,and build hydrogen energy system model including electrolyzers,hydrogen storage tanks,and hydrogen-fired gas turbines;emission assessment index system specifies carbon neutral boundary and pollutant atmospheric capacity boundary:first,carbon neutral concentration threshold model carbon footprint and carbon carrying capacity balance for quantification of regional carbon neutral indicators;second,based on the principle of solving the atmospheric environmental capacity by coefficients,a pollutant concentration threshold model is established.Finally,in order to solve the proposed problems of development of novel power system,the above results are used to construct regional atmospheric environmental constraints that include carbon neutrality constraints and pollution constraints,and on this basis,this dissertation propose novel power system dispatch strategy supported by hydrogen energy.The wind-hydrogen system operating cost model based on the expectation function is constructed,and the optimal scheduling model is established and solved with the objective of minimizing the comprehensive operating cost.The analysis of the calculation example shows that the power generation of the wind-hydrogen system accounts for 28.3%.Considering the regional atmospheric environmental constraints,the power generation of the wind-hydrogen system can be increased by 41.1%,and the CO₂ concentration and SO₂ concentration at the monitoring points can be reduced by 63.6%and 56.8%,respectively,verifying the effectiveness of the model.