Reliability Analysis of Power-Gas Integrated Energy System Based on Dynamic Simulation

The power-gas integrated energy system lays a foundation for improving energy efficiency, promoting the large-scale utilization of renewable energy, and building a low-carbon sustainable energy system. However, the complex interaction between the power system and the natural gas system has brought about prominent, more diverse, and complex dynamic stability problems. Interference in one system will propagate to another system through coupling devices, which may cause serious disasters such as cascading failures. In order to analyze the transient process of the natural gas system caused by the adjustment of the coupling devices, this paper established a model for the coupling devices and the dynamic process of the natural gas system in the power-gas integrated energy system. By comparing the existing numerical calculation methods, the method of characteristic was selected to solve the hyperbolic partial differential equations, and the mathematical models of different nodes in the natural gas system were established. The accuracy and practicability of the algorithm are verified by 3 cases, and the accuracy of the algorithm is verified by case 1 and case 2 including the power-to-gas(P2G)and gas turbine. Case 3 verified the practicability of the algorithm by analyzing the fluctuation of the natural gas system caused by the adjustment of power-gas coupling links, and the adjustment is caused by the change of new energy generation. The results of this paper can analyze the interaction of coupling equipment and natural gas system, and lay the foundation for the realization of dynamic simulation of the whole integrated energy system.