This work presents a 6.5-kV 1-kA SiC bipolar diode module for megawatt-range medium voltage converters. The study comprises a review of SiC devices and bipolar diodes, a description of the die and module technology, device characterization and modelling and benchmark of the device at converter level. The effects of current change rate, temperature variation, and different insulated-gate bipolar transistor (IGBT) modules for the switching cell, as well as parasitic oscillations are discussed. A comparison of the results with a commercial Si diode (6.5 kV and 1.2 kA) is included. The benchmark consists of an estimation of maximum converter output power, maximum switching frequency, losses and efficiency in a three level (3L) neutral point clamped (NPC) voltage-source converter (VSC) operating with SiC and Si diodes. The use of a model predictive control (MPC) algorithm to achieve higher efficiency levels is also discussed. The analysed diode module exhibits a very good performance regarding switching loss reduction, which allows an increase of at least 10 % in the output power of a 6-MVA converter. Alternatively, the switching frequency can be increased by 41 %.:1 Introduction
2 State of the art of SiC devices and medium-voltage diodes
2.1 Silicon carbide diodes and medium-voltage modules
2.2 Medium-voltage power diodes
3 Characterization of the SiC PiN diode module 37
3.1 Introduction
3.2 Experimental setup
3.3 Experimental results: static behaviour
3.4 Experimental results: switching behaviour
3.5 Comparison with 6.5-kV silicon diode
3.6 Oscillations in the SiC diode
3.7 Summary
4 Comparison at converter level
4.1 Introduction
4.2 Power device modelling
4.3 Determination of maximum converter power rating
4.4 Analysis
4.5 Increased efficiency through model predictive control
4.6 Summary
5 Conclusion
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:30135 |
| Date | 07 December 2016 |
| Creators | Filsecker, Felipe |
| Contributors | Bernet, Steffen, Lindemann, Andreas, Technische Universität Dresden |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | doc-type:doctoralThesis, info:eu-repo/semantics/doctoralThesis, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
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