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Análisis, diseño y optimización del convertidor CC–CC bidireccional reductor–elevador con acoplamiento magnético -Autor-Alba Rodríguez Lorente Tesis depositada en cumplimiento parcial de los requisitos para el grado de Doctor en Ingeniería eléctrica, electrónica y automática Universidad Carlos III de Madrid
ABSTRACT
Due to their ability to absorb, store, and subsequently deliver electrical energy,
Energy Storage Systems (ESS) stand out as a solution to many technical problems arising
from the need always to have energy available on demand.
Among the different ESS technologies, batteries, within the category of
electrochemical ESSs, have gained special relevance in recent times, for their exponential
deployment in industry, with a rapid improvement in their performance. Studies predict
that their use will continue to grow in the upcoming years and that they will play a major
role in applications such as renewable energies and electric transport.
In general, all applications that interact with the ESSs need to have power converter
circuits that control and transform the energy delivered by the ESSs efficiently, according
to the needs of the load demanding that energy. Bidirectional converters are especially
useful as an interface with the ESSs, since their versatility allows both the control of the
power supply to the load and the conditioning of the surplus or recovered energy from
the load to recharge the ESSs after having satisfied the original demand.
In this context, the research work carried out in this thesis focuses on those power
converters that present non–isolated bidirectional DC–DC topologies with Buck–Boost
operation as an interface with batteries and other secondary DC energy storage systems.
This subset of topologies provides practical advantages in this context of use in terms of
power density, and operating capability regardless of the voltage values demanded by the
load and the voltage level at the source.
From the topologies analysis in the state–of–the–art that meets these requirements,
it is concluded that the highest performances are obtained with topologies that allow
greater flexibility in modulation, at the cost of increasing the number of components and
the control difficulty.
This thesis document proposes a new non–isolated bidirectional DC–DC topology
with Buck–Boost operation as an interface to electrical energy storage systems, especially
batteries. The new topology is called Magnetically Coupled Bidirectional Buck–Boost
converter, or MCB3. The proposal aims to achieve good power density and high
modulation flexibility, allowing access to advanced modulations aimed at reducing total
losses. Of the proposed converter: the operation is analyzed, the optimization through
modulation possibilities is studied for both switching and conduction loss reduction, its
magnetic components are designed according to a minimum volume criterion, the power
stage is dimensioned based on an established specification and, at each step, the theory is
validated with simulation and experimental results. Finally, its performance is compared
to topological alternatives with which it shares either behavior or field of application.
