Modulation of power converters plays a decisive role in modern power electronics where low losses as well as dynamical requirements, harmonics and electromagnetic interference (EMI) are of great importance. The course covers synthesis and analysis of modulation methods for Voltage Source Converters (VSC).
Given in connection with EJ2311 every year P3
Circuit modelling, fundamental mathematics, harmonics in single-phase and three-phase systems, survey of modulation principles, relation between modulation and the development of power-semiconductors, carrier-based methods, SPWM and space vector modulation, influence of sampling, fixed pulse-patterns, harmonic elimination, tolerance band modulation, harmonics in power systems and electric railway traction, norms and standards, influence of harmonics on electrical machines, survey of harmonic filters.
After the examination the student should be able to
·Define fundamental concepts in pulse-width modulation
·Describe differences between different principles of modulation regarding properties such as harmonics and dynamic conditions
·Know different carrier based modulation methods and their synthesis.
·Use different methods for analysis of carrier based modulation methods
·Calculate pulse-patterns for harmonic elimination
·Estimate stray losses in electrical machines due to harmonics.
Lectures 16 hours, computer exercises 8 hours, Laboratory work 4 hours,55 hours individualized project
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EJ2200 Electrical machines and drives and EJ2300 Power Electronics.
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D. G. Holmes, T. Lipo., “Pulse Width Modulation for Power Converters”.Wiley Interscience.
P, 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.
The individualized project should preferably be linked to the student’s own research.
Projects and laboratory reports
Written examination
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Further information about the course can be found on the Course web at the link below. Information on the Course web will later be moved to this site.
Course web FEJ3311No information inserted
Third cycle
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Hans-Peter Nee