Dear Students,
We hereby invite you to the following E2C seminars.
SEMINAR 3
Title: Design of auxiliary power supply for HV applications
Speaker: Post doc. Andrei Blinov, KTH Electrical Energy Conversion, Stockholm
Date and time: Wednesday 27 January, 13:00 - 15:00
Venue: Lecture room D35, Lindstedtsvägen 5
Abstract: Auxiliary power converter design, intended to be applied as a floating power supply with high voltage step-down ratio. The converter is non-isolated, unidirectional, based on a tapped-inductor buck topology. It is intended to function as a first stage auxiliary converter for high voltage HVDC and FACTS applications
SEMINAR 4
Title: EMC considerations for traction systems
Speaker: Dr. Mathias Enohnyaket, Bombardier Transportation, Västerås
Date and time: Wednesday 3 February, 13:00 - 15:00
Venue: Seminarierummet, Teknikringen 33
Abstract: There is a trend of increasing of switching frequencies and slew rates of power electronic switches used in drive systems. Recently, Silicon carbide switches (MOSFETs, IGBTs) with slew rates of over 20kV/μs are available. The high slew rates minimize turn-on/off losses, but inject high frequency harmonics into the drive system components. The injected harmonics could trigger parasitic resonances in the cables, motors, inductors as well as generating Electromagnetic (EM) emissions. Parasitic resonances seriously degrade drive system performance, and in some cases might lead to motor and system failures. To ensure robust drive system functionality, it is essential to characterize the parasitic resonances in cables, motors, inductors, through modeling and measurements. Once resonances are identified, drive system functionality could be improved by detuning using RF filters; harmonics elimination at lower frequencies; or carefully choosing the motors and switching frequencies, for example.
This seminar shall focus on the characterization of parasitic resonances of magnetic components through modeling and measurements. A high frequency model for predicting EM emissions from a simple drive system shall be presented.
Best regards
Daniel Johannesson
PhD Candidate