Research On Optimal Operation Of Integrated Energy System Based On Multi-Energy Complementary

The integrated energy system can improve the system’s consumption of renewable energy by using the conversion between different energy sources,improve energy utilization efficiency through reasonable energy optimization,and construct a more stable and clean energy system to improve the reliability,economy and environmental protection of energy supply.Therefore,the coordinated and optimized operation of energy systems is worthy of in-depth study.This article has carried out research on the optimization of the integrated energy system model.In order to study the efficiency and flexibility of the integrated energy system,this article first analyzes the applicable model building method and system operation method.Aiming at the wind abandonment problem caused by the traditional combined heat and power(CHP)operation mode of "heat-load-based" in the small regional integrated energy system,this paper proposes a method of "source-network-load-storage" coordinated optimization operation for integrated energy system considering wind power accommodation and operational economic benefits.On the source side,heat pumps and energy storage equipment are used to decouple the ”heat-load-based” operation constraints of CHP,a steady-state electricity-heat flow is constructed on the grid side,integrated demand response is considered on the load side to increase the wind power accommodation space of the system.The system aims to minimize the total operating cost and takes into account constraints such as energy balance,steady-state electricity-heat flow and unit output,constructs an integrated energy system "source-network-load-storage" optimized operation model considering wind power accommodation.An integrated energy system consisting of a 33-node grid containing wind turbines and an 8-node thermal network is used to verify the correctness and effectiveness of the proposed method.The results of multi-scenario simulation show that this method can increase the consumption space of wind power and reduce the operating cost of the system effectively.On this basis,in view of the fact that large-scale and large-capacity wind turbines are connected to the energy system,it is easy to bring risks to the safe and stable operation of the system,and wind power cannot be completely absorbed,this paper introduces carbon capture and power-to-gas(P2G)synergistic technology and carbon trading model,proposes a multi-energy flow integrated energy system operation method considering the coordinated optimization of carbon capture and P2 G.This paper constructs a multi-energy flow integrated energy system that includes tightly coupled power network,thermal network and natural gas network of wind power and P2 G,considers the consumption of wind power and carbon trading,a steady-state electricity-heat-gas flow model is established,and a multi-energy flow energy system optimized operation model is constructed with the goal of optimal comprehensive economic operation of the system.In this paper,the modified IEEE39-node power system,6-node thermal network and 20-node natural gas network coupling system are used for modeling and analysis,and the system model is simplified and solved by the method of piecewise linear.An example is used to verify the correctness of the proposed optimization method,and the research results of this paper have been applied to a scientific and technological project for a provincial company of State Grid.