Course description

The electrical and thermal design and dimensioning of power converters in drive and energy technology are presented and discussed in detail in this lecture. Based on the terminal behavior of the various power converter topologies, the interactions with other system components are presented and evaluated. The lecture provides an overview of possible measures to improve the system behavior and deals with the protection of power converter circuits.
The following topics are covered in detail:

• Introduction
• Grid-connected power converters under idealized and real conditions and their most important applications in power
• engineering
• Self-commutated multilevel converters: Neutral point clamped inverters, floating capacitor inverters, series cell inverters,
• modular multilevel converters, hybrid circuits, modulation methods
• Semiconductor components for grid-connected and self-commutated power converters, protective devices
• Heat dissipation concepts for power semiconductors and passive components, junction temperature calculations
• Load cycle stability of power semiconductors
• Short-circuit current design for mains and motor side
• Protection concepts
• Insulation coordination, standards
• Transformer, grid connection
• Mains and motor-side filters
• Cable models
• Interaction between inverter and machine (insulation, bearing currents)
• Reliability calculations
• Excursion to converter plant if possible

Practical Exercise

The PES exercise usually takes place on Wednesdays, 11:30 a.m. - 1:00 p.m., in the Chemie-Hörsaal Nr. 1 (HS1, building 30.41) and will be given by M.Sc. Rainer Pfeffer.