Optimal energy management of a renewable microgrid integrating water supply systems

The interdependence between the power grid and water supply system (WSS) provides opportunities for energy conservation. However, the existing water supply flexibility has not been fully developed, resulting in an unsatisfactory effect. To address the problem, this paper proposes an optimal energy management strategy for a renewable microgrid (MG) integrating WSSs. First, a novel supply model that evaluates the interdependence between the large WSS and several islanded sub-systems, hydraulic stability, and desalination characteristic is established, in order to reduce the hydraulic coupling constraints and ensure water supply safety. To achieve an optimal performance of the MG integrating WSSs, a novel two-stage dispatching method is designed, where the day-head decisions fully consider the real-time power fluctuation, and the real-time stage corrects renewable generation deviation and supports external grid. Additionally, a two-stage algorithm is proposed to efficiently solve the scheduling problem. Simulation studies on a MG integrating WSSs indicate the proposed energy management strategy can reduce the water supply loss by 5.2%, and improve the MG economy by 19.5%, while supporting the external grid (EG).

Automated summary

The paper proposes an optimal energy management strategy for a renewable microgrid integrating water supply systems, with a new supply model and two-stage dispatching method designed to optimize the microgrid's performance and efficiency while efficiently solving scheduling issues.