Research On Low-carbon Economic Dispatch Of Electric-gas Integrated Energy System Considering Uncertainty

In the context of energy Internet,the electricity-gas integrated energy system has become an important way to transform the energy system and improve the comprehensive energy efficiency.With the continuous innovation of multi-energy coupling system,it is urgent to carry out modeling research on energy structure optimization and multi-energy flow coupling.On the other hand,the problem of carbon emissions from fossil fuel units has become increasingly prominent.In addition,the proportion of power generation connected to the grid of renewable energy with the characteristics of clean and efficient is growing rapidly.The uncertainty of wind power and load makes the coupling between power and gas grid more complex,and the uncertainty of energy supply and consumption end brings new challenges to the safe and stable operation of the system.In this context,a low-carbon economic dispatching model of power-gas integrated energy system with carbon capture is proposed for energy and environmental problems,and the interval optimization method is applied to the model to solve the uncertainties of wind power and load,in order to ensure the safe and efficient operation of the system.Firstly,based on the review of existing research,the physical architecture of traditional integrated energy system is constructed,and the two-way coupling effect of heterogeneous energy flow conversion between power system and natural gas system through coupling elements is analyzed.Then,based on this framework,the detailed modeling research is carried out in each unit of the system,and the traditional mathematical model is adopted for the power system.The steady-state mathematical model is used for the natural gas network.The coupling relationship of the coupling element was analyzed and modeled in detail through electric-gas energy flow.Secondly,on the premise of reducing wind curtailment and carbon emissions,a low-carbon economic dispatching model of electricity-gas integrated energy system with carbon capture is constructed.At the same time,a flexible operation mode considering carbon storage and hydrogen storage equipment is proposed in the model,so that the energy flow between the carbon capture system and the power-to-gas equipment is more closely linked.By putting the model into a mixed integer linear programming problem solving analysis show that the proposed power-gas containing carbon capture integrated energy system in reduced wind,has obvious advantages in reducing carbon emissions,and the economy,environmental protection of the system are improved,the model of system to the operation of the economy,environmental protection is of great significance.Finally,in view of the uncertainty of wind power and load,an interval optimization model based on interval programming is proposed for the coordinated operation of power-gas integrated energy system.The uncertainty of wind power and load as interval Numbers,according to the nonlinear optimization mathematical model conversion method,interval will contain the interval uncertain electricity-gas integrated energy system coordinated operation are applied to solve the model is converted into a deterministic model,the simulation results show that with the improvement of system uncertainty,goal expected cost and band width increase gradually,and then in the form of interval systems operation scheduling results and the interval analysis,provides decision makers with wind power uncertainty range under the level of profit,to ensure the integrated energy system under the condition of uncertainty can still be efficient and economic operation.