Abstract
Next-generation power systems will require innovative control strategies to exploit existing and potential capabilities of developing renewable-based microgrids. Cooperation of interconnected microgrids has been introduced recently as a promising solution to improve the operational and economic performance of distribution networks. In this paper, a hierarchical control structure is proposed for the integrated operation management of a multi-microgrid system. A central energy management entity at the highest control level is responsible for designing a reference trajectory for exchanging power between the multi-microgrid system and the main grid. At the second level, the local energy management system of individual microgrids adopts a two-stage stochastic model predictive control strategy to manage the local operation by following the scheduled power trajectories. An optimal solution strategy is then applied to the local controllers as operating set-points to be implemented in the system. To distribute the penalty costs resulted from any real-time power deviation systematically and fairly, a novel methodology based on the line flow sensitivity factors is proposed. Simulation and experimental analyses are carried out to evaluate the effectiveness of the proposed approach. According to the simulation results, by adopting the proposed operation management strategy, a reduction of about 47% in the average unplanned daily power exchange of the multi-microgrid system with the main grid can be achieved.
Highlights
In recent years, the multi-microgrid (MMG) concept has emerged to improve the operational and economic performance of distribution networks [1,2]
The most important issues in establishing appropriate models and control strategies are related to the complexity that is resulted from interaction of multiple MGs as well as the uncertainties that are caused by the intermittent nature of the renewable energy (RE)-based distributed energy resources (DERs) and variability of loads
Considering the significant role of the MMG system in the next-generation power systems, designing systematic and fair cost allocation methodologies to motivate MGs participation in the cooperative energy management strategies is of vital importance
Summary
The multi-microgrid (MMG) concept has emerged to improve the operational and economic performance of distribution networks [1,2]. Considering the significant role of the MMG system in the next-generation power systems, designing systematic and fair cost allocation methodologies to motivate MGs participation in the cooperative energy management strategies is of vital importance. In this regard, a hierarchical EMS is developed to tackle complexities in the integrated operation management of interconnected RE-based MGs in this paper. Modeling integrated energy management of an MMG system in a hierarchical framework; Proposing an efficient control strategy using MPC and two-stage stochastic programming with recourse; Developing a novel methodology for cost allocation among MGs using the line flow sensitivity factors.
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