Analysis of influence of natural gas modeling on the optimization of electric-gas integrated system

In the context of the goal of emission peak and carbon neutrality, the requirements for energy efficiency are increasing, and the electricity-gas system is playing an important role in the energy system for its high-efficiency and low-carbon emission. However, due to the complex form of the equations of natrual gas transmission, the simplified algebraic equations are used as the model of the natural gas system. It is not clear how the features retained by the proposed gas model have affected the optimal dispatch of the electricity-gas integrated system. This paper theoretically analyzes the influence of gas system modeling characteristics on electricity-gas cooperation from the perspective of the feasible region, which is a concept in optimization theory. Then, it is proved that the model considering the dynamic characteristics and the thermodynamic characteristics increases the feasible range of the gas-fired unit output through two electric-gas integrated test system, and the support of natural gas models with different characteristics to the power system is derived from the point of view of coupling elements.