Future energy systems and the protection of the electrical grid

One of the main research topics inside this thesis will be on what the effect will be on the present protection scheme when distributed generation units are extensively implemented inside the distribution system. The application of distributed generation will have an impact on the present protection scheme. This because the distributed...

The Effect of an Embedded VSC-HVDC link on the Transient stability of the Dutch and German Transmission Systems

Driven mainly by the Kyoto Protocol and the EU climate action (20-20-20 targets), the country members of the European Union have taken actions towards the reduction of emissions and the increase of the electricity generated by Renewable Energy sources (RES) [49]. According to studies of the European Network of Transmission System Operators for...

Analysis of Operation and System Losses of an Inductive Power Transfer System for Wireless Charging of Electric Vehicles

The promotion of resource-saving technologies by the public authority was being intensified during the last years in order to reduce energy consumption and CO2-emissions. If charged from renewable energy sources, electric vehicles can contribute significantly to these objectives. Additionally, they can be employed to store and balance the...

Coupled electromagnetic and structural analysis of support structures for the main rotor electric motor of a hybrid helicopter

With increasing fuel prices and growing interest in environmentally friendly transportation the aerospace industry has set ambitious targets for all electric flight. At the same time there is growing interest in the rotorcraft market that is expected to grow significantly in the next decades. Although the technology for all-electric flight is...

Design of a Simulation Platform to Support Operation Decisions in a Petrochemical Network

This master’s thesis project is considered to be a starting point for further research in the field of intelligent electrical power grids with the main goal to increase the reliability in real-time operations of electrical power systems. The increased reliability will consequently increase the confident level of electrical power system operators...

In-situ impedances measurement and influence of 2 k - 150 kHz disturbances on measurement of electrical parameters

With the growth of the number of electric appliances which suffer from electromagnetic inference (EMI) in the frequency range 2 k – 150 kHz, the setting up of researches in this field has become more and more popular. Measuring impedances accurately in this frequency range is of great assistance for better understanding of the circuit as well as...

Rapid Control Prototyping in a three phase grid-tie BSNPC inverter - Sensors, PWM and control concepts

In these ages of a more and more increasing energy demand and struggle to reduce CO2 emissions, the need of robust, analytical and fast ways to introduce new alternative energy concepts into practice is imminent. Nowadays, engineers struggle to incorporate all parts of modern power electronic applications, such as new topologies, control...

A Solid-State Transformer for Interconnection between the Medium- and the Low-Voltage Grid

In recent years the complexity of the grid systems has grown due to the increased penetration of renewable energy and distributed generation sources. The increased complexity requires new methods to quickly manage the changing sources and loads. This research focuses on one of such technologies, called the Solid State Transformer (SST). A SST...

The Investigation of Newly Designed Transformer Windings with Reduced Thickness of Oil-Impregnated Paper Insulation

For determining the insulation dimensions, Smit Transformers uses a so called “design curve”. As the oil-impregnated paper insulation of the windings has been improved, a new design curve has to be established. A number of different types of transformer winding samples were subject to lightning impulse tests. The breakdown voltages measured from...

Electrical characterization of polymeric DC mini-cables by means of space charge and conduction current measurements

The world’s first commercial High Voltage Direct Current (HVDC) transmission link was built in 1954 between the Swedish mainland and the island of Gotland. At that time, it was proved that HVDC transmission is technically feasible. Since then, HVDC cable systems have been used worldwide in electrical energy transportation. Most HVDC...

Analysis of Switching Transient Overvoltage in the Power System of Floating Production Storage and Offloading Vessel

Large transient overvoltages can be caused by the switching operation of vacuum circuit breakers of induction motors. In order to analyze the switching transient overvoltage and use an appropriate protective method in the power system of floating production storage and offloading (FPSO) vessel, the accurate models of electrical equipments are...

Analysis on Energy Balance for a Smart Grid in Stadshavens Area, Rotterdam

Impact of Future Residential Loads on Medium Voltage Networks

This report describes the impact of future residential loads and generators on the loading of electricity grids by applying a new load modelling technique to a large set of existing medium voltage (MV) networks. Different future scenarios with resulting load profiles are tested on the MV networks.

Dielectric Loss Estimation using Damped AC Voltages

Insulation failures in HV components may be caused by lower dielectric strength due to aging processes and by internal defects in the insulation system. It is known, that unlike voltage testing, measurements of the dielectric loss may give an absolute indicator for the quality level of the cable insulation. For several years the application of...

Asset Management Decision Support for HV SCFF Power Cables

Decision support methodology for the remaining life evaluation vis-a-vis replacement of power cables.