Multi-Terminal DC Networks: System Integration, Dynamics and Control

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...

The Power Sandwich: A Three-Dimensional Power Electronics Assembly Technology

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...

Operation and Power Flow Control of Multi-Terminal DC Networks for Grid Integration of Offshore Wind Farms Using Genetic Algorithms

For achieving the European renewable electricity targets, a significant contribution is foreseen to come from offshore wind energy. Considering the large scale of the future planned offshore wind farms and the increasing distances to shore, grid integration through a transnational DC network is desirable for several reasons. This article...

Distributed Power Flow Controller

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...

Energy Storage and Power Management for Typical 4Q-Load

Diesel generators in small electricity grids are mostly not used in a very efficient way. The reason for this is twofold. First of all, the efficiency of a diesel generator is dependent on the ratio determined by the average power divided by the peak power of the generator. The smaller this ratio is, the lower the efficiency. Furthermore, some...

Distance practical education for power electronics

Grid support by power electronic converters of distributed generation units

An increasing number of small Distributed Generation (DG) units are connected to the grid. The introduction of DG causes several problems, which are mainly related to the differences between DG units and conventional generators. Four problems have been considered in this thesis: damping of harmonics, voltage control, the behaviour of DG units...

The electrical, thermal and spatial integration of a converter in a power electronic module

This thesis is concerned with the design and implementation of a power electronic system (14/42V DC/DC converter) that is implemented in the automotive environment, specifically the engine compartment. The power electronic system must have a high power density while operating in a high temperature environment. Power electronic modules are...

Improving packaging and increasing the level of integration in power electronics

The use of power electronics is growing extensively in applications such as the automotive field, lighting, power supplies, motor drives, etc. The ultimate goal is to make power electronics as transparent to the final user as possible, which means little extra cost, use of existing space and little or no extra thermal management. This sets very...

Simulation Based Analysis of Electric Power Conversion Systems

Dynamic analysis of three-phase AC converters: A method for the dynamical analysis and synthesis of pulse modulated three-phase AC converters.

Low-speed, low frequency AC drive: Matrix-Cuk converter in an AC drive application with shaft sensorless vector control

Electromagnetic soft transition: A method for programming transitions in electronically controlled induction motor drives