First doctoral thesis developed on the Orona Ideo campus presented

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First doctoral thesis developed on the Orona Ideo campus presented

THESIS

First doctoral thesis developed on the Orona Ideo campus presented

On 21 February, Erik Garayalde presented his doctoral thesis on hybridisation systems for storage systems

2020·02·24

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Since Mondragon Unibertsitatea began its activity on the Orona Ideo campus, the Electricity research group moved part of its activity to this new campus. The results of these years of work are becoming increasingly relevant, as on 21 February, Erik Garayalde presented the first doctoral thesis developed at the Orona Ideo campus, a thesis on hybridisation systems for energy storage systems.

Orona Ideo is an innovation ecosystem in which the company (Orona), the research centre (Ikerlan) and the university (Mondragon Unibertsitatea) work closely together. In addition, the ecosystem represents a showcase of renewable energy, as the complex features 4 renewable energy generation systems (solar thermal, photovoltaic, biomass, and geothermal) and the 3 agents that compose it reinforce its commitment to research and development of Energy storage technologies, a field that is becoming increasingly important in the industry.

Congratulations Erik! We are sure that more will come following you. 

“Hybrid Energy Storage Systems via Power Electronic Converters”.

  • PhD programme: DOCTORATE PROGRAMME IN MECHANICAL ENGINEERING AND ELECTRICAL ENERGY.
  • Thesis directors: Unai Iraola Iriondo, Iosu Aizpuru Larrañaga.
  • Court:
    • President: Daniel Quevedo Gonzalez (Paderborn University)
    • Vocal: Carlos Bernal Ruiz (Universidad de Zaragoza)
    • Vocal: Omar Taha M. Hegazy (Vrije Universiteit Brussel)
    • Vocal: Mikel Mazuela Larrañaga (Mondragon Unibertsitatea)
    • Secretary: Eneko Unamuno Ruiz (Mondragon Unibertsitatea)

Abstract

In recent years, many research lines have focused their efforts on improving energy efficiency and developing renewable energy sources. In this context, the use of energy storage systems is on the rise, as they can contribute to the integration of renewables to the main electrical grid. However, energy storage systems are divided into high energy or high power devices. Due to the lack of a solution covering both aspects, researchers are forced to find alternatives. The hybridization of different energy storage technologies is presented as a suitable solution for this problem, since it combines high power and high energy within the same system.

The main goal of this thesis is the design and implementation of a hybrid energy storage system (HESS), capable of improving the performance provided by a single storage technology. As a first step in this direction, this document reviews and classifies the most relevant HESS topologies found in the literature. This allows a better understanding of the drawbacks and benefits of each configuration.

To ensure the optimal use of this HESS, it is essential to design a suitable energy management strategy and a proper power electronic converter control. To this end, the control structure has been analyzed from different approaches. On the one hand there would be the classic multilevel control structure, which usually consists of three levels among which are the operating constraints, the power sharing and at the lowest level the control of the converter. On the other hand there would be the single level control structure in which both, the power distribution and the control of the converter, are integrated within the same level by using modern MPC control algorithms.

Finally, three different case studies are presented to show the practical application of the developed control strategies together with the main conclusions of the thesis.