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PhD defence by Adriana Carolina Luna Hernández on Energy Management Systems for Microgrids Equipped with Renewable Energy Sources and Battery Units

Time

18.05.2017 kl. 13.00 - 16.00

Description

 Adriana Carolina Luna Hernández, Department of Energy Technology, will defend the thesis "Energy Management Systems for Microgrids Equipped with Renewable Energy Sources and Battery Units".

TITLE

Energy Management Systems for Microgrids Equipped with Renewable Energy Sources and Battery Units

PHD DEFENDANT

Adriana Carolina Luna Hernández

SUPERVISOR

Professor Josep M. Guerrero

MODERATOR

Associate Professor Sanjay K. Chaudhary 

OPPONENTS

Associate Professor Dezso Sera, Dept. of Energy Technology, Aalborg University (Chairman)
Dr. Xiao Zhao-Xiao, Tianjin Polytechnic University, China 
Professor Jordi de la Hoz Casas, Escola Universitària d'Enginyeria Tècnica Industrial de Barcelona (EUETIB), Spain

ABSTRACT

The electric power system has been transformed and evolved towards decentralized systems, which interact with each other and within the whole system. In this way, microgrids are essential components to increase the reliability and efficiency of the power system.  They are low-scaled electrical distribution networks that integrate distributed energy resources, loads, power converters and grid components in a stable way, working either in grid-connected or islanded modes. 

In order to operate microgrids, hierarchical schemes have been developed. The lower levels regulate voltage/current and coordinate power sharing, while the higher levels deal with optimal power management, mainly focuses on ensuring feasibility. On top of that, an energy management level is required to define commands and conditions so that the microgrid operates in an economically optimal way.  Some of the issues that involve the implementation of energy management systems in microgrids are the need of incorporating flexibility related to architecture and algorithms, as well as, considering the active participation of consumers and the inherent variable nature of the renewable generation.  The inclusion of energy storage systems in microgrids provides the energy management with additional degrees of freedom, and therefore, making the microgrid more flexible to the changeable situations.

This project is focused on implementing adaptable energy management systems for microgrids in order to coordinate generation, demand and storage, as well as compensate the effects of the variability of renewable energy generators and load fluctuations, in view of the user necessities. The considered hybrid energy systems comprise of renewable (solar photovoltaic and wind turbine), conventional systems (utility grid connection), battery energy storage systems and loads. In this work, a modular structure of energy management system is introduced in order to conduct the function of optimizing the energy dispatch of distributed resources. One of the modules includes the optimization problem formulation, which has been modelled as mixed-integer linear programming in order to ensure optimality when the problem is feasible.

Moreover, the design and implementation of energy management systems are conducted, evaluating firstly deterministic cases by using 24 h-head data in order to optimize the use of the distributed energy resources. It is considered grid-connected case studies within a demand response program both promoting self-consumption and when injecting energy to the grid is profitable.  This type of approach can be applied to low-scale microgrid such as household application by optimizing the energy resources of each household but also by cooperating between them or with a common resource. 

Finally, an online structure is defined to deal with the variability that cannot be considered one day ahead.  Additionally, an evaluation framework is proposed to compare the performance of an energy management system not just against a previous approach, but also against absolute boundaries.  

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PhD defence by Adriana Carolina Luna Hernández on Energy Management Systems for Microgrids Equipped with Renewable Energy Sources and Battery Units

ALL ARE WELCOME. THE DEFENCE WILL BE IN ENGLISH.

AFTER THE DEFENCE THERE WILL BE AN INFORMAL RECEPTION AT PONTOPPIDANSTRAEDE 111 IN TNE COFFEE ROOM.

 

Host

Department of Energy Technology

Address

Pontoppidanstræde 105, lokale 3.115

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