Multi-objective design tool for optimizing capacitor selection in power converters based on the mission profile
Fecha
2019-09-13Primeiro membro da banca
Wang, Huai
Segundo membro da banca
Dupont, Fabrício Hoff
Terceiro membro da banca
Martins, Mário Lúcio da Silva
Quarto membro da banca
Sartori, Hamiltom Confortin
Metadatos
Mostrar el registro completo del ítemResumen
Long-term effective and reliable power electronics systems are one of the next big challenges in the
energy sector. Power converter’s efficiency and reliability are key elements for expanding renewable
sources installed capacity and should be taken into account in annual power processing estimation and
in its design phases. Thus, in order to maximize energy yield, reduce costs, and increase revenues by
power generation, a power converter must be designed according to the specific system characteristics
and its energy profile. Considering photovoltaics (PV) systems as a case study, the instantaneous power
delivered is dependent on several factors, such as solar irradiance, ambient temperature, module
orientation and mounting type, solar cell performance, among others. This Doctoral dissertation aims to
contribute to this topic by proposing a comprehensive and novel multi-objective design methodology
for designing capacitors in power converters, based on the energy and environmental mission profile in
which they will operate. To achieve this goal, a mission profile characterization method was developed
in order to enable the designer with a set of information about the long-term behavior of a PV power
plant. Also, in order to enable the long-term analysis of power converter performance, an electro-thermal
and lifetime modeling of energy buffer capacitors are done in the function of varying conditions of both
ambient levels and energy processing. Results for a single-stage PV inverter are presented and discussed
with the following objectives: 1) to understand how different mission profiles affect the performance of
power converters and 2) how to use this knowledge in order to properly design the capacitors on a longterm
view. A multi-step design tool is developed to reach this goal, where cost, volume, and reliability
of multiple capacitor bank designs can be quickly evaluated by the designer. To further demonstrate the
usefulness of this proposed design tool, analyses and results of a second case study are also presented,
where the DC-link capacitors of a double-conversion uninterruptable power supply are designed.
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