EJ3216 Experimental Methods in Power Electronics 8.0 credits

Experimentella metoder inom effektelektroniken

The course is intended mainly for PhD students whose research topic is within or related to power electronics or electrical drives. The course provides an introduction to experimental methods in power electronics. 

  • Education cycle

    Third cycle
  • Main field of study

  • Grading scale

    P, F

Course offerings

Autumn 18 for programme students

  • Periods

    Autumn 18 P1 (8.0 credits)

  • Application code

    51347

  • Start date

    27/08/2018

  • End date

    26/10/2018

  • Language of instruction

    English

  • Campus

    KTH Campus

  • Tutoring time

    Daytime

  • Form of study

    Normal

  • Number of places

    No limitation

Information for research students about course offerings

Givenirregularly.PreliminaryH16next time.

Intended learning outcomes

After completion of the course the student shall be able to:

• describe different methods for galvanically isolated voltage measurements

• describe the operation of co-axial shunts

• describe the operation of a Rogowski-coil

• describe the operation of zero-flux Hall-effect-based current sensors

• describe how skew effects measurements of switching transients

• describe the operation of a digital power meter

• describe different potential problems when measuring voltage and current simultaneously

• describe the main idea behind calorimetric measurements

• describe the main idea behind electro-thermal loss measurements

• explain when and why galvanic isolation is necessary

• explain how phase shifts can influence measurement results

• explain how a double-pulse test is performed

• explain how skew can be compensated for

• explain how a measurement setup should be grounded and isolated in order to minimize currents in signal grounds

• explain why the accuracy is likely to be higher for calorimetric loss measurements than for measurements of input and output power

• explain how measurements of forward voltage drops could be performed in order to reduce the effect of self heating

• explain how a short circuit of a bridge leg can be detected and cleared

• calculate approximate values of parasitic currents through signal grounds

• calculate switching losses from double-pulse tests

• calculate converter losses from electro-thermal loss measurements

• calculate converter losses from measured quantities of calorimetric measurements

• calculate stray inductances from voltage and current measurements

Course main content

The following experimental methods are covered:

·         Voltage measurement in three-phase systems using compensated voltage dividers and virtual grounding

·         Differential high-voltage probes and optically isolated probes for galvanically isolated voltage measurements

·         Effects of stray capacitances on currents in signal grounds

·         Isolation transformers for reduction of undesired ground currents

·         Coaxial shunts and Rogowski coils for high bandwidth current measurements

·         Zero-flux Hall-effect-based current sensors

·         Digital power meters and their applicability in different measurement setups

·         Double-pulse measurements

·         Analysis of parasitic elements of the main circuit using current and voltage measurements

·         Determination of switching losses from measured waveforms and compensation for measurement skew

·         Methods for determination of conduction losses without impact of self heating

·         Electro-thermal loss measurements of converters operating at steady state

·         Calorimetric loss measurements

·         Detection and clearance of short-circuits in bridge legs

Disposition

Eight two-hour Seminars, Eight four-hour laboratory exercises with preparatory work, One written examination

Eligibility

PhD students at KTH and PhD students from other universities

Literature

Vetenskapliga publikationer och manualer för instrument som tillhandahålls av examinatorn

Scientific papers and instrument manuals provided by the Examiner

Required equipment

Laboratory equipment is provided by the Laboratory of electrical energy conversion.

Examination

  • EXA1 - Examination, 8.0, grading scale: P, F

During the seminars the students should show that they are able to absorb the content of a scientific text and then present it in a professional way for the other students. The students should also show that they are capable of taking part in a scientific discussion on the subject.

The student should prepare a laboratory exercise for the other students. The student should also perform 7 laboratory exercises which have been prepared by fellow students. The written examination is a standard examination with the grades P or F. For the grade P it is required that at least 60% of the maximum number of points are achieved.

Requirements for final grade

·         At least one approved seminar with oral presentation

·         An approved laboratory setup for a specified measurement method

·         7 approved laboratory exercises on setups made by fellow students

·         An approved written examination.

Offered by

EECS/Electric Power and Energy Systems

Contact

Hans-Peter Nee, hansi@kth.se

Examiner

Hans-Peter Nee <hansi@kth.se>

Version

Course syllabus valid from: Autumn 2014.
Examination information valid from: Spring 2019.