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IK4 Doctorados

 

TEKNIKER

People whose vocation are focused on enhancing the innovative capabilities of their customers and furthering their technological capital.

 
DOCTORATES

TEKNIKER

Viability study on converters based on broadband technology in high-speed, low-power drives

TEKNIKER

START: 10/2017

OPEN

OBTAINING DOCTOR DEGREE: 09/2020

Description

To meet the needs of an ever more demanding market in power applications, increasingly sophisticated power converters are required in terms of efficiency, compactness and signal quality. The basis of current converters, the silicon semiconductor, is now approaching the theoretical limits of the technology, which means there are fewer possibilities for improvement. In recent decades, research has been conducted on materials with characteristics suitable for replacing silicon, leading to the development of broadband semiconductors. The highlights of this technology are (GaN) gallium nitride and silicon carbide (SiC).

Broadband semiconductors produce fewer losses and can operate at higher temperatures than conventional semiconductors, making it possible to obtain more compact and efficient converters. They can also operate at much higher switching frequencies, resulting in better quality signals with smaller filters.

The emergence of this technology has opened up a range of possibilities in fields such as the electric/hybrid vehicle, drives, photovoltaics and power supply in general. Despite expectations, however, a detailed study needs to be carried out to determine the degree of viability of the technology, as its high switching speed makes it a source of electromagnetic noise, its reliability is unproven, and its cost is high owing to the youth of the technology.

The aim of the thesis is to study the contribution and viability of broadband semiconductors in converters used in high-speed electrical drives, targeted at machine tool applications (spindles) and flywheel-based storage systems. In addition to the aforementioned advantages, the new technology will improve control dynamics and system performance.

The points developed during the thesis are:

  1. Converter sizing and design based on broadband semiconductors. We will take into account the thermal aspects and the effects of parasitic components (common mode, overvoltage, etc.), and will study different solutions to mitigate them.

  2. Study and development of an algorithm for optimal control for a high-speed machine, based on criteria such as runtime, torque ripple, the machine’s parameters, etc.

  3. Analysis of limits of switching frequency and control dynamics in terms of efficiency and control algorithm frequency. Comparison with conventional silicon converter.

Department or unit of the Associates Technology Center

Automation and Control Unit

Investigation line

ICT-Actuators, electromagnetic machines

Start date planned

10/2017

Obtaining date of the doctor degree

09/2020

Requeriments

- Masters level required (completed before starting the Ph.D programme), research vocation and English.
- Particularly welcome is a University Master"s degree in Energy and Power Electronics from Mondragon Unibertsitatea, but other studies are also welcome.
- Initiative and the ability to solve problems are essential.

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