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

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