A Dynamic Equivalent Energy Storage Model of Natural Gas Networks for Joint Optimal Dispatch of Electricity-Gas Systems

TL;DR

This paper introduces a dynamic energy storage model for natural gas networks that simplifies complex gas system dynamics, enabling efficient and accurate joint optimal dispatch with electricity systems, while reducing computational complexity.

Contribution

It proposes a multi-port, time-varying capacity energy storage model that captures gas network flexibility and integrates seamlessly into power system dispatch problems.

Findings

Model ensures feasible control strategies

Reduces computational burden significantly

Maintains high accuracy in joint dispatch

Abstract

The development of energy conversion techniques enhances the coupling between the gas network and power system. However, challenges remain in the joint optimal dispatch of electricity-gas systems. The dynamic model of the gas network, described by partial differential equations, is complex and computationally demanding for power system operators. Furthermore, information privacy concerns and limited accessibility to detailed gas network models by power system operators necessitate quantifying the equivalent energy storage capacity of gas networks. This paper proposes a multi-port energy storage model with time-varying capacity to represent the dynamic gas state transformation and operational constraints in a compact and intuitive form. The model can be easily integrated into the optimal dispatch problem of the power system. Test cases demonstrate that the proposed model ensures feasible control strategies and significantly reduces the computational burden while maintaining high accuracy in the joint optimal dispatch of electricity-gas systems. In contrast, the existing static equivalent model fails to capture the full flexibility of the gas network and may yield infeasible results.