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Van der Geest, M. (author)
The electrification of transportation, and especially aerospace transportation, increases the demand for high performance electrical machines. Those machines often need to be fault-tolerant, cheap, highly efficient, light and small, and interface well with the inverter. In addition, the development time and cost are usually limited, with little...
doctoral thesis 2015
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Wang, Y. (author)
doctoral thesis 2015
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Ting, Y. (author)
This thesis investigated the possibility of increasing the efficiency of a DC-DC converter over a wide load range and a wide input-voltage range based on the Single Active Bridge (SAB) topology with two approaches. The first approach involved making changes to the topology whereas the second made use of the concept of modularity. In the first...
doctoral thesis 2015
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Jassal, A. (author)
This thesis deals with analysis, calculation and validation of eddy current loss models for Permanent Magnet (PM) direct drive generators for wind turbines. The modelling approach is a mixed use of analytical and Finite Element (FE) methods. The models are validated experimentally and design guidelines are developed thereafter.
doctoral thesis 2014
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Wang, J. (author)
It is an inevitable trend that the power conversion module will have higher switching frequency and smaller volume in the future. Bandgap devices, such as SiC and GaN devices, accelerate the process. With this process, the parasitic elements in the module will probably have stronger influence on circuit operations than before. In this thesis,...
doctoral thesis 2014
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Thomas, W. (author)
The growing energy consumption of lighting as well as rising luminous efficacies and -fluxes of high-power Light Emitting Diodes (LEDs) have contributed to the widespread use of LEDs in modern lighting systems. One of the most prominent users of the LED-technology is automotive (exterior) lighting. It benefits from LEDs’ high efficiencies and...
doctoral thesis 2014
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Teixeira Pinto, R. (author)
When large amounts of electricity need to be transported for long distances, or when underground or submarine cables are involved, using direct current high-voltage transmission systems is more efficient and cost effective than using traditional high-voltage alternating current transmission. Therefore, the main thesis objective is to study to...
doctoral thesis 2014
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Josifovic, I. (author)
Current PCB power converter construction technologies are based on the utilization of nonstandardized building blocks. Utilization of passive components with various shapes, poor thermal properties and mixed technology mounting (THT and SMT) represents fundamental limit for reaching high power density, effective thermal management, particular...
doctoral thesis 2014
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Hackner, T.J. (author)
In this thesis it is shown that in the case of an automotive electric power steering system, critical pulse power loads can be decoupled from the power net with a storage element and a multifunctional converter. A multifunctional converter system is proposed because it uses the motor drive system as a dc-dc converter and hence no additional...
doctoral thesis 2013
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Shrestha, G. (author)
The trend in wind energy is towards large offshore wind farms. This trend has led to the demand for high reliability and large single unit wind turbines. Different energy conversion topologies such as multiple stage geared generators, single stage geared generators and gearless (direct drive) generators have been coupled to the wind turbine in...
doctoral thesis 2013
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Gong, X. (author)
Conducted EMI in Inverters with SiC Transistors Electromagnetic Interference (EMI) is the main side effect accompanied with the fast voltage and current switching transients in power electronics applications. Compliance of the Electromagnetic Compatibility (EMC) standard is prescribed for any power electronics product before entering the market....
doctoral thesis 2013
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Ani, S.O. (author)
Wind energy accounts for an increasing percentage of the energy supplied to the electricity network. Electricity generation from wind is now cheaper than other renewables and almost cost competitive with other conventional sources of electricity generation. However, this impressive growth is largely due to advances in large wind turbines,...
doctoral thesis 2013
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Van der Pijl, F.F.A. (author)
The thesis considers contactless electromagnetic energy transfer, applied to residential and office environments. The objective is to investigate and design a (partially) contactless residential energy distribution network system for multiple electrical devices with a highly improved end-user flexibility. A special focus is system efficiency.
doctoral thesis 2012
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Vu Xuan, H. (author)
In this thesis modeling, analysis, design and measurement of exterior rotor permanent magnet (PM) machines with concentrated windings are dealt with. Special attention is paid to slotting effect. The PM machine is integrated in flywheel and used for small-scale ship application. Analytical model and automated nonlinear transient finite-element...
doctoral thesis 2012
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Roodenburg, B. (author)
Food manufacturers are looking for new preservation techniques that don’t influence the fresh-like characteristics of products. Non-thermal pasteurisation of food with Pulsed Electric Fields (often referred to as PEF) is an emerging technology, where the change of the food is less than with thermal pasteurisation. With this method,...
doctoral thesis 2011
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Borisavljevic, A. (author)
There is a growing number of applications that require fast-rotating machines; motivation for this thesis comes from a project in which downsized spindles for micro-machining have been researched (TU Delft Microfactory project). The thesis focuses on analysis and design of high-speed PM machines and uses a practical design of a high-speed...
doctoral thesis 2011
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Cvoric, D. (author)
Increasing levels of fault currents in utility grids are expected to result in mechanical and thermal overstresses of different power system components. To cope with these increased levels, expensive upgrades and replacements of currently employed Circuit Breakers might be required in the near future. Fault Current Limiters (FCLs) are expected...
doctoral thesis 2010
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Bang, D. (author)
In order to maximize the energy harnessed, to minimize the cost, to improve the power quality and to ensure safety together with the growth of the size, various wind turbine concepts have been developed during last three decades. Different generator systems such as geared and direct-drive generator systems have been developed. Based on energy...
doctoral thesis 2010
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Yuan, Z. (author)
In modern power systems, there is a great demand to control the power flow actively. Power flow controlling devices (PFCDs) are required for such purpose, because the power flow over the lines is the nature result of the impedance of each line. Due to the control capabilities of different types of PFCDs, the trend is that mechanical PFCDs are...
doctoral thesis 2010
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Zhao, D. (author)
Power electronics applications are usually accompanied by high voltage and current amplitudes, and steep voltage and current transients. The EMI (Electromagnetic Interference) issue is regarded as the main side effect of power electronics applications. Noise level prediction is a vital task for filter design, but many difficulties are...
doctoral thesis 2009
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