14 December - MSc thesis of Norbert Rosman

Title: Impact Analysis of a Virtual Plant
Venue: Van der Poelzaal, LB01.220 at 9.00

The model of a VPP was based on the City-Zen project ongoing in one of the districts of Amsterdam in which home storage systems are aggregated to participate as a VPP on the Dutch energy market. It was build in Python environment where all the logic was kept. Further it was interfaced with power systems analysis tool – PowerFactory in which load-flow calculations were made. The model enabled impact evaluation of the VPP under economical and physical angle.


24 November - MSc thesis of Shaochuan Zhang

Title: Low Voltage Ride Through Control for the Brushless Doubly-Fed Induction Generators
Venue: Van der Poelszaal, LB01.220 at 14.00

Stability and security of the grid are two vital aspects of energy supply. To keep the grid stable, it is necessary that the electricity plant can control and protect the mechanism. A significant part is the Low Voltage Ride Through (LVRT) capability of the sustainable energy plant. When some large loads are connected to the grid or as a result of grid faults like lightning strikes or short circuits, short–term voltage dip may occur. This low voltage dip condition plans to be simulated and the behaviours of Brushless Doubly-Fed Induction Generator (B-DFIG) should be improved in this situation.

17 November - MSc thesis of Gert-Jan van Raamsdonk

Title: Prototype of real-time monitoring system for dynamic Line Rating
Venue: Snijderszaal, LB01.010 at 10.30hrs

In the near future a lot of off-shore wind energy will be connected to the Dutch electric grid. In order to utilize more the existing overhead lines a real-time monitoring device is suggested which allow dynamic line rating. During the thesis a prototype is developed to test the feasability and reliability of  a low power wide area netwok in a high voltage environment in the High Voltage Laboratory of TU Delft.


26 October - MSc thesis of Seungyeon Enid Kim

Title: Experimental verification for seamless mode transitions of multiple microgrids using fuzzy-based droop controller
Venue: Van der Poelzaal, LB01.220 at 15.00 hrs

This thesis concerns development of frequency-based microgrid network.  Within this context, it focuses on the seamless (dis)connection of multiple microgrids using fuzzy-based droop control. The controllers developed for the transitions were verified and validated through both simulations and experimental analysis.

25 October - MSc thesis of Weijun Qian

Title: Modeling and Analysis of high frequency high voltage multiplier circuit for high voltage power supply
Venue: Van der Poelzaal LB01.220 at 13.30hrs

This thesis concentrates on the investigation the voltage multiplier circuit as part of high frequency high voltage power supply. The circuit operations are explained in details and methods to evaluate the electrical performances are introduced. The impact of circuit parameters and parasitic components are investigated. An analytical power loss model is developed in the thesis. At last, optimization of capacitance network are discussed and compared.

24 October - MSc thesis of Thekla Papakosta

Title: Investigating Hybrid Battery configuration for Solar Home Systems
Venue: Elekronzaal HB01.230, 13.30hrs

As the developing world struggles to satisfy basic needs due to lack of electricity, alternative renewable options such as Solar Home Systems (SHS)  have been used as a solution to this problem. Batteries are considered to be one of the he main technical limitations plaguing SHSs as they  experience the shortest lifetime and highest cost of all the other components

The main goal of this thesis is to examine whether a hybrid battery configuration  would be the best option to be used in SHS applications. For this purpose, a non-empirical dynamic lifetime estimation model is proposed taking into account different battery parameters and behaviours for different technologies, such as the variation of battery DOD, temperature, and manufacturer data-sheet cycle life curves.

For the comparison of the different storage options a singular function that quantifies upfront and lifetime battery costs while at the same time captures the future battery cost  trends of different battery technologies, was constructed for single battery options and for hybrid battery options.

The comparison results show that indeed there is Hybrid battery configuration that minimizes the cost function.

19 October - PhD defense of Wenbo Wang

Title: Electromagnetic design of high frequency PFC boost converters using Gallium Nitride devices
Venue: Aula, Senaatzaal, at 10.00

This thesis explores high frequency operation potentials of GaN power semiconductors that are suited for high voltage, low current applications. The exploration is carried out by conducting analytical loss modelling of GaN transistors, uncovering desirable operation conditions of GaN devices for high frequency operations according to analysed results from the model, identifying optimal topologies and operation modes in power converters that can facilitate such conditions so that optimal utilization of the new technology can be achieved. Potentials of GaN technology are demonstrated in the application of PFC converter with all the developed techniques.




11 October - MSc thesis of Rik Wilmer

Title: Control of a three-port converter for human power
Venue: Dijkstrazaal HB09.150 at 9.00

In the Netherlands alone, 1.1 million people have been diagnosed with diabetes, and per week 1200 people are diagnosed. Obesity is also a serious problem of our modern society.

These health issues can be reduced by promoting a healthy lifestyle, incorporating regular exercise. To make the exercise even more attractive, the output energy of the workout is converted to electricity and stored for later use. This concept of clean energy should appeal to the customer.

The presented platform does not only promote human health, it also spreads awareness about the amounts of energy we use every day. The envisioned platform consists of a bike-stand with generator and a user interface, which keeps track of the energy going in and out of the system and instructs the user how to use the system properly. It controls the power flow in the generator, the battery and to the system output by controlling the voltages on the peripherals.

This project extends existing work with energy storage by designing, building and controlling a three-port converter, providing both theory and a demonstration of health and electrical factors: human health through cycling, human power because of extracting optimum power from the leg muscles, and research into a three-port converter that connects rectification to battery and grid-connection.

28 September - MSc thesis of Charalampos Papadakis

Title: Protection of HVDC grids using DC hub
Venue: Van der Poelzaal LB01.220, at 9.00hrs

Nowadays, there is a movement towards the creation of HVDC grids. However, there are still some obstacles to be confronted. To address these problems, the idea of a DC hub is introduced. A DC hub is a multiport DC-DC converter, which serves as an actively controlled DC node. In the current thesis, the front-to-front configuration with intermediate AC transformers is studied.  A three-port DC hub is designed, where a modular multilevel converter is used in every port. The model is tested under transient phenomena. Finally, the design requirements are specified in order to aid in the protection of HVDC grids.

27 September- MSc thesis of Nikitas Karatzaferis

Title: DC-DC Bidirectional Converter with USB Type-C for Power Delivery
Venue: Van katwijkzaal HB03.230, at 15.00hrs

This master thesis focused on the implementation of an application board which could provide an integrated solution to support bidirectional power flow between end-devices using the USB-type C interface, and a low voltage DC bus. The results occurring from the creation and testing of the board, proved that such an integrated solution is viable. Support of the DC bus of a commercial building using the Li-ion batteries of smart-devices, is a potential future application of this research.

Tuesday 26 September - MSc thesis presentation of Sahil Karambelkar

Title: Distributed Optimal Power Flow in a DC Distribution System
Venue: Dijkstrazaal HB09.150, at 9.00hrs

Increase in distributed energy resources in the power grid has prompted researchers to develop distributed optimization techniques for effective solutions. Local DSO's could then deploy such models for their day-to-day energy scheduling problems. This thesis aims to develop such a distributed optimization algorithm which could be implemented in DC systems while taking into account network congestion and line losses.

21 September 2017 - MSc thesis presentation of Jie Zhang

Title: Power Supply for Multiple Pickup IPT System in Lighting Applications

Venue: Elektronzaal, HB01.230, at 10.00 hrs

This thesis focuses on the IPT system with multiple pickups in the lighting application. A problem with the multiple pickup system is that at light load the power supply consumes a large amount of reactive power for a small active power demand. The aim of the design is to build a power supply with a constant current output. The designed circuit is supposed to reduce the reactive power demand and keep zero voltage switching (ZVS) in all range of load.

15 September 2017 - MSc thesis presentation of Donghao Wu

Title: Power Supply for Multiple Pickup IPT System in Lighting Applications

Venue: Elektronzaal, HB01.230, at 10.00 hrs

This thesis focuses on the IPT system with multiple pickups in the lighting application. A problem with the multiple pickup system is that at light load the power supply consumes a large amount of reactive power for a small active power demand. The aim of the design is to build a power supply with a constant current output. The designed circuit is supposed to reduce the reactive power demand and keep zero voltage switching (ZVS) in all range of load.

15 September 2017 - MSc thesis presentation of Michalis Poikilidis

Title: Multi-port DC hub based on the Modular Multilevel Converter for Multi-terminal HVDC grids

Venue: Timmanzaal, LB01.170, at 9.00 hrs

It is expected that DC grids will evolve into large meshed networks, which will have multiple DC voltage levels. Two DC grids operating at different voltage levels could be interconnected using a DC-DC converter. The role of the DC-DC converter in meshed DC networks is similar to the role of a transformer in traditional AC systems. The DC-DC converter could take a range of functions in DC grids. The DC-DC converter should prevent the propagation of DC faults and should also have the ability to isolate DC faults. Because of its high cost, the DC-DC converter cannot be used as DC breaker in meshed DC grids, but it can be strategically placed in the DC grid to provide protection zone separation. In case multiple HVDC (High Voltage Direct Current) lines need to be interconnected, a multiport DC-DC converter should be used. The DC hub is a multiport DC/DC converter which consists of an inner AC circuit and AC/DC converters interfacing each HVDC line. The main goal of the DC hub is the interconnection of multiple HVDC lines operating at different voltage levels and with different DC grid configurations.

With the concepts analysed in this thesis, HVDC network system designers will be able to select the most suitable DC hub topology for the interconnection of multiple HVDC lines, use a methodology for the clearing of AC faults within the DC hub, use a methodology for the safe connection or disconnection of ports and understand the design limitations of the DC hub when generation or consumption units are connected to its AC side.

Thursday 31 August - MSc thesis presentation of Ryan Adilardi Prakoso

Title: DC Power Flow Control Converter for Meshed LVDC Distribution Grid

Venue: Van der Poelzaal, LB01.220, at 10.00 hrs.

Meshed LVDC distribution grid is considered to be more efficient and reliable than AC distribution network. This applies in particular when there is a significant portion of DC sources, storage, and loads in the grid. Its optimal operation, however, is not inherent. The power flow in distribution network can suffer from congestion due to the line impedance of the system. Thus, a device that can regulate the power flow is regarded important. Several works have proposed DC-DC transformer and series voltage source type of power flow control device for HVDC application. DC-DC transformer, however, needs to be rated at full grid power. Meanwhile, series voltage source type for HVDC requires an additional connection to either nearby AC network or other lines.

30 August 2017 - MSc thesis presentation of Bryan Malik

Title: Interconnecting Solar Home Systems in Developing Nations

Venue: Van der Poelzaal, LB01.220, at 10.00 hrs.

fig 1: Interconnection topology in 350 V
fig 2: Interconnection topology in 48 V

29 August 2017 - MSc thesis presentation of Yunhe Yu

Title: Battery modelling and usage guidelines In Solar Home Systems

Venue: Elektronzaal, HB01.230, at 14.00 hrs

Nowadays, there are still some regions in developing countries lacking electrification. A solution to electrify the households in these areas with off-grid Solar Home Systems (SHS) has been proposed for some time. However, battery storage in SHS is always the limitation in both cost and lifetime point of view. Thus, a battery with stable behaviour, longer lifetime and less maintenance as well as a lower price is highly desired in SHSs. With the narrow choices on economical commercial battery technologies, there is another approach to improve the battery behaviour in SHSs.

This thesis is aiming at exploring a solution from usage perspective to maintain the battery behaviour in long-term, in SHSs. In order to achieve the goal, a tool and a method were proposed to provide a practical solution for battery performance preservation in SHSs.

In this study, two battery technologies which are commonly applied in SHSs were explored: the LiFePO4 battery and the Valve Regulated Lead-acid battery.

30 August 2017 - MSc thesis defense of Ashil Thomas

Title: A Distributive approach of Microgrid Control based on System frequency

Venue: Van Katwijkzaal, HB03.240 at 14.00hrs

The CSGriP project conceived the idea of a Cell, a microgrid comprising of DRES, ESS and Controllable loads., without relying on any communication signals. A control strategy based on droop control that enables a seamless (dis)connection of Cell with External Grid while maintaining converter in voltage source mode is proposed, which is validated by experiments on a standard converter. A decision-making algorithm is developed for autonomous operation of Cells, between Stand-alone and Interconnected modes. The modular and distributed nature of the developed controls and algorithm, makes its advantageous to apply such Cells to electrify remote areas, which have limited or no access to power. The system can be easily scaled and expanded by adding more Cells, to build a strong and robust microgrid network.

28 August 2017 - MSc thesis defense Kenji Yanez Martinez

Title: Capacitive Grounding for DC Distribution Grids with Multiple Grounding Points

Venue: van der Poelzaal, LB01.220 at 13.00

DC Microgrids could play an important role in a renewable and sustainable future. Unfortunately, there are not enough standards or guidelines for the implementation of DC Microgrids or DC distribution grids in general. Nevertheless, reliability and security of such a system must be assured at all times. As a consequence, an important challenge lies in terms of protection.

This thesis project focuses on capacitive grounding and their respective ground fault detection and protection scheme for a general DC distribution grid. The protection scheme proposed aims to discriminate currents caused by load shifts from ground fault currents with as little communication between the protective relays as possible.

25 August 2017 - MSc thesis presentation of Nikos Gouvalas.

Title: Solid-state Protection of Low Voltage DC Distribution Grids

Venue: Van der Poelzaal, LB01.220, at 13.30 hrs

With the increasing introduction of DER in the everyday energy landscape, it becomes essential that a partial transition from AC to DC within the whole range of voltage levels has to be re-considered especially in practical cases where DC system performance seems outstanding compared to AC based counterparts. On that note, LVDC microgrids have become an attractive option for efficient integration and distribution of high-quality power to commercial, residential and data center facilities as well as in propulsion and automotive power systems. However, the lack of standards, guidelines and practical experience are among the main reasons for holding the large scale integration of DC at the low-voltage distribution level back.

The main challenge to be tackled in order for low-voltage DC grids to emerge from small DC nano- and micro-grids to a full scale DC distribution grid is the development of economically feasible, safe and reliable protection equipment and techniques. In the context of this thesis a fault detection and location method for ultra-fast fault selective current interruption is being proposed without the need of any additional control and/or communication requirements. In order to experimentally validate the proposed fault selective protection (FSP) algorithm a bi-directional 400V/20A solid-state circuit breaker prototype has been developed and tested utilizing a full short-circuit protection scheme with additional inrush-current limiting control functionality for grid start-up.

24 August 2017 - MSc thesis presentation of Avinash Yadav

Title: Finding suitable material for the retaining sleeves in the tidal generators.

Venue: Timmanzaal, LB01.170, at 10.00hrs.

Tidal energy is one of the forms through which renewable energy can be extracted from oceans which covers more than 70\% of the earth surface. Tides are a periodic function and can be predicted for a long period this makes tidal energy more favorable than other ocean energy. To prevent the sealing problems associated with the tidal generators, they are submerged in seawater. Insulating sleeves are used to overcome issues of corrosion of permanent magnets and electrical insulation which arises due to the flooding of generators. The aim of the thesis is to suggest a suitable material that can be used for the insulating sleeve based on the eddy current loss and temperature of the generator. Due to flooding of the generator, the magnetohydrodynamics effect will be present, the significance of these are also evaluated. The study suggests that steel is a suitable material for sleeves and Magnetohydrodynamics losses are negligible.

24 August 2017 - MSc thesis presentation of Dimitris Tsorvas

Title: Wireless Power Transfer for Low Power Medical IoT Devices

Venue: Elekronzaal, HB01.230at 9.30 hrs.

The integration of the Internet of Things depends on autonomous operation of the its modules. Sustainable powering of these devices has proven to be one of its most challenging aspects. This thesis aims to investigate various antenna-rectifier topologies, also known as rectennas, and analyze the challenges that arise when harvesting low levels of radio frequency (RF) power in order to supply medical IoT sensors.

23 August 2017 - MSc defense of Lucía Beloqui Larumbe

Title: Transient performance, power sharing and power quality comparison of Virtual Oscillator Control and Droop Control in isolated AC microgrids

Venue: Zaal Elekron HB 01.230,  at 10.30

In the context of an increasing penetration of intermittent renewable sources and other technologies, traditional control schemes in power systems need to  be enhanced. A novel technique based on controlling inverters to emulate the dynamics of weakly nonlinear oscillators was compared in this Master Thesis with the ubiquitous Droop Control. Conclusive results were obtained from more than 500 switching simulations.

22 August 2017 - MSc defense of Tianzhu Tang

Title: Design and optimization of a linear generator for waste heat recovery system

Venue:  Meetingroom LB01.210, at 14.30hrs

Generator Design for the Symphony Wave Power DeviceThe purpose of this research is to develop a linear generator design methodology for a predefined free piston expander used in a waste heat recovery system. To achieve this goal, several tasks have been done. First the single sided permanent magnet synchronous flat linear machine with fractional slot concentrated winding is selected. The magnetic field distribution is established analytically and the results are verified. Subsequently a multi-objective genetic algorithm optimization for the whole operation range is performed to achieve the most economic design with the smallest volume. The optimum results are further investigated by FEM and prove to be feasible and practical.

22 August 2017 - MSc defense of Ibrahim Diab

Venue: Sijndersroom, LB01.010, at 9.00hrs

Title: Design of a Modular Primary for a Wireless Power Transfer System

“This thesis investigates the design of a modular primary coil for a wireless power transfer system. One problem with conventional coils is their low tolerance to misalignment with the receiver coil, affecting the efficiency in the power transfer. Another problem is the lack of standardization and the need for a primary to cater for a variety of secondary coil geometries. Finally, foreign and live objects, if obstructing the system, can lead to significant heating problems and hazards. This thesis design aims to address these problems by modularizing the primary and turning the modules on or off as needed. To keep the system in resonance for all possible activated coils combinations, a capacitor matrix has been designed to match all the possible equivalent inductance values. The system response was simulated, and was shown to offer better misalignment tolerance when compared to a conventional coil.” 

21 August 2017 - MSc thesis defence Djurre Wikkerink

Title: Generator Design for the Symphony Wave Power Device

Venue: 13.00 in the Snijdersroom, LB01.010

Wave power is a large untapped source of renewable energy. There is a wide variety of wave energy converters and one of them is the Symphony Wave Power device. The aim of this thesis is to find the best generator design for the Symphony. There is some research available on generator designs for wave energy converters but the Symphony is a unique case, so a new research needed to be conducted.

Several generator types can be used in the Symphony. Compared to an induction and switched reluctance generator, the iron-cored permanent magnet synchronous generator (PMSG) seems a good choice because it is efficient and reliable. A disadvantage, however, is that, in the case of the Symphony, the iron losses are relatively high at partial loads. An air-cored PMSG does not have this problem since it has no iron losses at all. A drawback of the air-cored PMSG is that it needs more permanent magnetic material, which is expensive. Finally, it was decided to test and compare the iron-cored radial flux PMSG and the air-cored axial flux PMSG on both performance and costs.

For both generator types, an analytical model was built which puts out the efficiency and material cost. To find the best generator geometries for the case of the Symphony, an optimization procedure was created which minimizes both material costs and losses.

It was found that an axial flux air-cored PMSG is both cheaper and more efficient than a radial flux iron-cored PMSG. The iron losses of an iron-cored generator are relatively high at partial loads while the Symphony operates at partial loads most of the time.

21 August 2017 - MSc defence Ozgur Can Sakinci

Venue: 10:30 in van der Poelzaal (LB01.220)

Title: Small-Signal Stability Modelling and Analysis of Modular Multilevel Converter and its Closed-Loop Controllers

As the transformation of the electricity generation progresses, the number of power electronic-based devices connected to the electricity grid is expected to grow. To ensure the stability of the power system in a scenario with high penetration of power electronic converters, the dynamics and stability characteristics of these devices have to be comprehensively studied. This is especially important for bulk converters — with capacities in the hundreds of megawatts range — such as high-voltage direct current (HVDC) systems.

Small-signal analysis is extensively used in power system stability studies. The calculation of the system eigenvalues provides insights regarding the dynamic behavior and the nature of the interactions within the system. However, generating a small-signal representation of power electronic converters is known to be problematic, due to the switched operation of such converters and their complex control structures. Nevertheless, usage of modular multilevel converters (MMC) in HVDC systems is rapidly increasing. This creates the need for extensive studies regarding its dynamic behavior. Due to the MMC unique submodule-based topology, special actions have to be taken if the stability of the converter is to be analyzed.

In this thesis, a small-signal model of a generic MMC was developed by linearizing all the converter plant and control equations, to analyze the converter stability. Averaging was used to eliminate nonlinearities brought forth by the converter switching actions.

The main contributions of this thesis are the application of classic linear-time invariant theory to a time-varying system by linearizing the full converter model at different points in time, and the application of modal analysis methods to the MMC.

The small-signal model was verified against a large-signal one, both developed in Matlab/Simulink. Additionally, the system eigenvalues obtained analytically and numerically —using Matlab/MuPaD and Simulink Control Design Toolbox, respectively — were benchmarked. After obtaining the system state-space matrix, its transfer functions were used to estimate the input impedance of the MMC in the frequency domain. Using the linearized system matrix and an optimization algorithm, namely MVMO, the locations of the converter eigenvalues were optimized by finding a new set of controller gains. Finally, calculating the converter eigenvalues, understanding the effects of these eigenvalues on the system variables and applying advanced tools to tune the controllers of the MMC, and possibly also its main circuit parameters, may aid system designers in controller design and parametrization studies.

18 August 2017 - MSc defense of Hong Di

Title: Investigation on termination oil-rubber interface parallel to electric field with water  contamination

Venue: Van der Poelzaal, LB01.220 at 13.00.00hrs

At the end of a power transmission line, a special equipment called termination is designed to decrease the electric field. However, terminations are always bothered by water contamination which may cause severe faults during operation time. This research aims to investigate the influences brought by water contamination on terminations, and discuss possibilities of detecting the presence of water content by using electrical methods. 

6 July 2017 - MSc defense of Alexander Jongeling

Title: Optimising the Input Filter of Traction Installations in DC Railway Power Systems
Colloquium, EKL 01.180 at 14.30hrs

In this thesis research is done to the optimum size of the capacitor in the LC high voltage filter in the Dutch railway. A Simulink model has been made to simulate the Dutch railway and a train. Parameters have been changed to simulate various different situations and cases. Two simulation models have been used. One with a constant power controlled loading of the motors and one without any control of the motor speed. It has been found that the capacitance of a not speed controlled system (0.8 mF) can be much lower than in the case of a constant power controlled speed controller(10mF with RC branch).

30 May 2017 - Solar-powered bidirectional EV charging station

The PhD project on solar charging of electric vehicles will be demonstrated at the TU Delft Research Exhibition Dig-it: the largest science expo of the Netherlands. A Nissan leaf EV will be charged from solar panels and discharged using Vehilce-to-grid (V2G) technology with the developed 10kW solar powered bidirectional EV charger.

Click for the brochure of the developed EV-PV charger and the specification sheet of EV-PV charger

When: DEMO DATES @ The green village, TU Delft
Tuesday 6 June, at 12.30 PM and 14.30 PM
Wednesday 7 June, at 13.30 PM and 15.30 PM

Where: The Green Village, TU delft, Van der Burghweg 1, 2628 CS Delft. Map of location

Register @

30th March 2017 - Five Research projects at TU Delft Research Exhibition Dig-it

Five projects of DCE&S group will be showcased at the TU Delft Research Exhibition Dig-it. There will be a demo of the 'Solar-powered bidirectional electric vehicle charging station' on 6 and 7 June

Wireless e-bike charger - Peter van Duijsen, Pavol Bauer
Solar-powered bidirectional electric vehicle charging station - Gautham Ram Chandra Mouli, Pavol Bauer, Miro Zeman
Modular Solar Home System for low-income households in developing nations - Nishant Narayan,  Pavol Bauer, Jelena Popovic, Miro Zeman
PBIM: PV-Battery Integrated Module - Victor Vega, Pavol Bauer, Laura Ramirez, Miro Zeman
Mathematical modelling of electrical drives - Henk Polinder, Domenico Lahaye 

TU Delft Research Exhibition

6, 7 and 8 June 2017 the largest Scientific Expo of the Netherlands will take place at the Delft University of Technology. We invite you to come and visit this years special edition, due to the celebration of TU Delft’s 175th anniversary in 2017.

The TU Delft Research Exhibition showcases the latest state-of-the-art of our innovative ideas that could be of interest to your business:  

  • 175 visual & interactive research presentations, across 11 different themes
  • Excursions to research facilities
  • More than 20 inspiring Speed Lectures 

This is your chance to get a taste of our cutting edge technology and meet our brilliant minds! During the TU Delft Research Exhibition the International Festival of Technology takes place at the campus. So even more reason to come!  

Access to the exhibition is possible after registration and free of charge. For more information and registration:


7th March 2017 - MSc defense of Giovanni Molinari

Title: A MILP Formulation for Power-Based Scheduling of Combined Heat and Power Units
Van der Poelzaal, LB01.220 at 10.00hrs

This Thesis proposes a Mixed-Integer Linear Programming (MILP) formulation for the Optimal Scheduling of CHP units. Instantaneous thermal and electrical power profiles are modeled avoiding any kind of discontinuity in the heat and electricity production, including flexible Start-Up and Shut-Down trajectories. An application to a real case of study is then presented, involving a district heating network with CHP units, boilers and thermal storages representative for the Rotterdam "city-heating" system.

28th February 2017 - MSc defense of Isabelle Vlasman

Title: Developing Smart Charging Strategies for Large-scale Integration of Photovoltaics and Electric VehiclesVenue: Snijderszaal, LB01.010 at 10.30hrs

This thesis presents different strategies of charging EVs at an office with PV arrays, in order to integrate large amounts of PV and EV without causing any grid violations. A general framework for the different strategies is developed, containing an aggregator, the EV charging stations and a grid monitoring system. Three different ways of mitigating grid violations are defined, and each of these strategies start charging either at maximum charging power or average charging power. In this way, the EVs will be fully charged upon departure (typical constant current/constant voltage mode charging for lithium-ion batteries included) while keeping the grid characteristics within limits. The developed charging strategies were proven to increase the possible PV and EV integration without causing violations in the grid compared to uncontrolled charging.

10th February 2017 - MSc defense of Anna Hoftgartner

Title: Neutral Neighbourhoods
zaal P, Bouwkunde at 10.00hrs

30th January 2017 - MSc defense of Erwin Mostert

Title: A modular DC/DC converter using SiC switches for railway applicationsVenue: Van der Poelzaal, LB01.220 at 10.30 hrs

Companies that develop converters for railway applications are facing two problems during the design: the IGBTs used generate too much heat and the input voltage of the converters is not standardized. These problems could be solved by using a silicon carbide (SiC) based modular converter, in which the switching losses are low and the input voltage is divided among the modules. A SiC based modular converter was designed, build and evaluated.

18th January 2017 - 'Charging of electric vehicles while driving will soon become a reality' - H2020 project of DCE&S group

Professor Pavol Bauer is involved in an H2020 project with 13 partners focusing on the metrology for inductive charging based on resonant coupling.

Pavol Bauer : "Inductive charging of electric vehicles is rapidly becoming a reality. The biggest advantage of this technology is that a car can be charged in a parked state, without a plug or even while driving. But the technology is also highly autonomous, needs smaller batteries and has a high-efficiency power transmission. Add the reduction of CO2 emissions and oil consumption and you see why we need to get a move on with inductive charging.

The accepted H2020 project with 13 partners and total budget of 1,8 million euro focuses at measuring the efficiency of the inductive power transfer (IPT) and the actual transferred power to the vehicle. It also enables reliable demonstration of compliance with existing safety standards for human exposure. The consortium will develop the metrology support for this purpose and for the development of high-efficiency couplers for inductive charging of electric vehicles (EVs)."

20th December 2016 - Apple prize for PhD student Gautham Ram Chandra Mouli

The annual apple prize of the department of Electrical Sustainable Energy was given to PhD student Gautham Ram Chandra Mouli on the occasion of the annual Christmas dinner of the department on 20th December 2016. The prize was a Slovakian glass souvenir shaped like an apple.


13th December 2016 - Christmas dinner - Indian theme

The annual Christmas dinner of the DCE&S group was held in the Indian restaurant 'Maharaja' with the theme 'India' on 13th December 2016. Indian attire was worn by the members of the group and there was a presentation by the Indian PhD students on Indian culture and traditions. It is planned to have every Christmas dinner based on the theme of a country. 

16th December 2016 - MSc defense of Tim Velzeboer

Title: Sustainable & Contactless Charging of e-Bikes
Venue: Snijderszaal, LB01.010 at 10.00 hrs

E-Bikes are considered to be a green form of transportation, but if the main source of energy to charge the bikes still comes from fossil fuels is the e-bike still called green?In this thesis a sustainable bike shed is designed  with the aim to be grid independent. Also the way of charging the e-bikes is not user friendly because the user has to bring their charger with them. A solution for this is the second part of the thesis, a contactless charging system for e-bikes is designed.

13th December 2016 - MSc defense of Tim Feenstra

Title: A study to end-winding induced iron losses in high-speed electrical machines with concentrated windings
enue: Van der Poelzaal , LB01.220 at 15.00 hrs

One potential problem associated with the high electrical frequency in high-speed electrical machines are additional iron losses near the end-windings. They are expected to be a significant part of the total iron loss. The reader is introduced to currently known methods to study high-frequency iron loss estimation and end-effects in laminated media. No suitable method is found. Therefore, an experimental approach is presented. A short-axial laminated stator core is exposed to high-frequency excitation fields generated by coils with normal and extended end-winding heights. The proposed experimental method is verified numerically with a simplified brute-force 3D finite element model. Significant less losses are measured and calculated for the extended end-winding case. The results show that most of the high-frequency losses are induced in the stator end laminations near the end-winding. In addition, it is found that the traditional eddy-current model underestimates the modelled results significantly if a wrong peak magnetic flux density is used. With both the experimental and numerical approach, it is shown that the impact of high-frequency end-winding induced iron losses on the total core loss cannot be neglected in iron loss estimation methods for short axial high-speed electrical machines with concentrated windings.

6th December 2016 - PhD student Nils van der Blij featured on Quadraad magazine

PhD student Nils van der Blij was featured on the December issue of the Quadraad magazine. The article has been seen at this link