Optimal Water-Power Flow Problem: Formulation and Distributed Optimal Solution

Journal Article · Fri Jan 12 04:00:00 EST 2018 · IEEE Transactions on Control of Network Systems

DOI:https://doi.org/10.1109/TCNS.2018.2792699· OSTI ID:1421914

Dall-Anese, Emiliano ^[1]; Zhao, Changhong ^[1]; Zamzam, Admed S. ^[2]; Sidiropoulos, Nicholas D. ^[2]; Taylor, Josh A. ^[3]

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1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
2. University of Minnesota
3. University of Toronto

This paper formalizes an optimal water-power flow (OWPF) problem to optimize the use of controllable assets across power and water systems while accounting for the couplings between the two infrastructures. Tanks and pumps are optimally managed to satisfy water demand while improving power grid operations; {for the power network, an AC optimal power flow formulation is augmented to accommodate the controllability of water pumps.} Unfortunately, the physics governing the operation of the two infrastructures and coupling constraints lead to a nonconvex (and, in fact, NP-hard) problem; however, after reformulating OWPF as a nonconvex, quadratically-constrained quadratic problem, a feasible point pursuit-successive convex approximation approach is used to identify feasible and optimal solutions. In addition, a distributed solver based on the alternating direction method of multipliers enables water and power operators to pursue individual objectives while respecting the couplings between the two networks. The merits of the proposed approach are demonstrated for the case of a distribution feeder coupled with a municipal water distribution network.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), NREL Laboratory Directed Research and Development (LDRD)
• DOE Contract Number: AC36-08GO28308
• OSTI ID: 1421914
• Report Number(s): NREL/JA-5D00-69064
• Journal Information: IEEE Transactions on Control of Network Systems, Journal Name: IEEE Transactions on Control of Network Systems Journal Issue: 99 Vol. PP; ISSN 2325-5870
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
distributed algorithms
optimal power flow
optimal water flow
power systems
successive convex approximation
water systems