A decentralized energy management system

Abstract

The primary goal of an energy management system (EMS) in power networks is to balance the supply and demand in a cost efficient manner given its operating horizon, and uncertainties in generation due to renewable generators and in demand. This goal is formulated as the economic dispatch problem. A centralized energy management system faces issues in scalability due to introduction of new generator or storage units and in robustness due to failures in some of the entities in the grid including the EMS itself. To alleviate these complexities a versatile decentralized energy management system (d-EMS) is developed. The d-EMS embeds a decentralized solution to the economic dispatch problem (EDP) based on the alternating direction method of multipliers (ADMM) inside a decentralized implementation of the receding horizon control. The ADMM based algorithm solves the EDP for the scheduling horizon. The receding horizon control allows the system to adapt to changes in the forecasts and network configuration. Decentralized protocols to handle changes to the communication network of devices is provided. These device failure and addition protocols entail network information updates only, thanks to the simple initialization of the ADMM algorithm.

Onboard Energy Storage and Power Management Systems for All-Electric Cargo Vessel Concept

“…[22,23]. However, increasing the number of elements and intermediate systems of the vessel grid may negatively affect the system reliability and require future study [24]. Moreover, the presented type of vessel is relatively large, and the potential fluoridation in real conditions can be minimized due to the high inertia of the ship and oversizing of the propulsion system by 15%.…”