The joint optimization of critical interdependent infrastructure of an electricity-water-gas system

TL;DR

This paper presents a joint optimization model for electricity, water, and gas systems, demonstrating cost savings and improved economic performance by leveraging system interdependencies.

Contribution

It introduces a novel joint optimization approach for interdependent infrastructure systems, highlighting economic benefits over separate optimizations.

Findings

9% reduction in total electricity cost through joint optimization

Water and gas storages used as regulation capacity for load shifting

Overall economic performance improved by joint system operation

Abstract

Electricity, water, and gas systems are critical infrastructures that are sustaining our daily lives. This paper studies the joint operation of these systems through a proposed optimization model and explores the advantage of considering the system of systems. Individual and joint optimizations are studied and compared. The numerical results show that the total electricity cost for these three systems can be reduced by 9% via joint optimization. Because the water system and gas system intrinsically include the storages in their systems, the power system can use these storages as the regulation capacity to shift load from peak hours to off-peak hours. Since the saving on the power generation cost surpasses the incremental cost in the operation and maintenance (O&M), the overall economic performance is improved by the joint optimization.