Modeling A Micro-Nexus of Water and Energy for Smart Villages/Cities/Buildings

TL;DR

This paper presents a co-optimization model for a micro water-energy nexus integrating power flow, renewable energy, storage, and hydraulic pipe characteristics, demonstrating improved cost-efficiency in smart infrastructure systems.

Contribution

It introduces a novel integrated water-energy nexus model with a co-optimization framework for smart city infrastructure, combining nonlinear hydraulic and electrical models with mixed-integer nonlinear programming.

Findings

Co-optimization yields higher cost-efficiency than separate optimization.

The model effectively integrates renewable energy and storage in water-energy systems.

Simulation on IEEE systems validates the approach's effectiveness.

Abstract

This paper introduces a micro-nexus of water and energy which can be considered as one of the physical infrastructures of the future building/city/village systems. For the electricity side, an alternating current (AC) power flow model integrated with battery energy storage and renewable generation is adopted. The nonlinear hydraulic characteristics in pipe networks is also considered in the proposed micro water-energy nexus (WEN) model. Integer variables are involved to represent the on/off state of pumps. Base on the proposed nexus model, a co-optimization framework of water and energy networks is developed. The overall co-optimization model is a mixed-integer nonlinear programming problem which is tested on a waterenergy nexus which consists of the IEEE 13-bus distribution system and a 8-node water distribution network. The simulation results demonstrate that the cost-efficiency of the co-optimization framework is higher than optimizing two systems independently.