EJ2311 Modulation of Power Electronic Converters 6.0 credits

Lectures

There are eight two-hour lectures. Attendance is not compulsory but should be a good help in understanding the contents of the course. Lectures are given in English. To get the best benefit from the lectures it is strongly advised to read the relevant parts of the course book in advance.

Tutorials

During the course six two-hour tutorials will be given. The main objective of the tutorials is to show how problems can be solved and to prepare for the written examination. Typically, the problems are solved by a teaching assistant in interaction with the students.

Computer exercises

There are two computer assignments demonstrating the use of computers and numerical methods in the synthesis and analysis of converter modulation patterns. Ahead of the first assignment, a preparatory work must be carried out. The preparatory work is handed out during the first lecture and should be handed in at the beginning of the first computer assignment. The results from the two computer assignment are to be uploaded to canvas for examination. Each report will be discussed in an oral session of approximately 30 minutes. Both reports must be judged passed to fulfil the course requirements.

Laboratory exercise (compulsory)

There is one laboratory exercise demonstrating practical aspects of power converter modulation. The laboratory report must be judged passed to complete the course requirements.

• Fourier series expansions to analyze arbitrary periodic signals in the frequency domain. Waveform symmetries to identify and characterize spectral components in periodic signals.
• Analysis of three-phase systems by symmetric components.
• Figures of merit to quantify the harmonic distortion of periodic signals.
• Carrier-based pulse width modulators (PWM) for single and polyphase voltage source converters.
• Fourier analysis of carrier PWM by double fourier series expansion.
• Simple space vector modulators.
• Selective harmonic elimination methods.
• Direct torque control systems (DTC).
• Multi-level power converter topologies.
• Multilevel modulation methods.

After passing the course, the student shall be able to

• compute the harmonics resulting from different modulation schemes and its impact on different connected loads and sources
• solve problems related to the selection and adaptation of pulse-width modulation schemes to meet common performance criteria
• analyze modulation schemes using modern numeric computer tools and EMT simulators and explain their solutions.

Knowledge in power electronics, 6 credits, equivalent to completed course EJ2301.

At least one of the following:

• Knowledge in continuous-time signals and systems, 6 credits, equivalent to completed course EQ1110/HF1011/II1303/CM2013/SD2125.
• Knowledge in differential equations and transform methods, 6 credits, equivalent to completed course SF1523/SF1633/SF1682/SF1683.

Knowledge in power electronics, 6 hp, corresponding to completion of EJ2301

AND at least one of the following:

Knowledge in time-continouos signals and systems, 6 hp, corresponding to completion of EQ1110/HF1011/II1303/CM2013/SD2125

OR

Knowledge in differential equations and transform methods, 6 hp, corresponding to completion of SF1523/SF1633/SF1682/SF1683

• LAB1 - Laboratory Work, 1.0 credits, grading scale: P, F
• PROA - Computer Assignment, 1.0 credits, grading scale: P, F
• PROB - Computer Assignment, 1.0 credits, grading scale: P, F
• TENA - Written Exam, 3.0 credits, grading scale: A, B, C, D, E, FX, F

Based on recommendation from KTH’s coordinator for disabilities, the examiner will decide how to adapt an examination for students with documented disability.

The examiner may apply another examination format when re-examining individual students.

If the course is discontinued, students may request to be examined during the following two academic years.

Staffan Norrga

• All members of a group are responsible for the group's work.
• In any assessment, every student shall honestly disclose any help received and sources used.
• In an oral assessment, every student shall be able to present and answer questions about the entire assignment and solution.

In this course, the EECS code of honor applies, see: http://www.kth.se/en/eecs/utbildning/hederskodex.