Abstract
This chapter has introduced the main multilevel converter topologies, i.e. the DCC, the FC, and the CHB converters, as well as the MMC, which is a recent topology that is expected to be widely applied in HVDC transmission systems. After classifying the modulation techniques, the basics of SVM and CB-PWM for multilevel converters have been presented. In the case of SVM, a modulation algorithm prone to be implemented in a digital processor has been applied to the three-level DCC (or NPC converter) and described in detail. A capacitor voltage balancing strategy based on selecting proper redundant vectors has also been embedded in the modulation. In the case of implementing a CB-PWM, several carrier signals are required for multilevel converters. Different carrier dispositions have been shown, including PS-PWM and LS-PWM. CB-PWM is especially interesting for modular converter topologies, such as the CHB converter and the MMC.
| Original language | English |
|---|---|
| Title of host publication | Control Circuits in Power Electronics |
| Subtitle of host publication | Practical Issues in Design and Implementation |
| Publisher | Institution of Engineering and Technology |
| Pages | 267-306 |
| Number of pages | 40 |
| ISBN (Electronic) | 9781849198233 |
| ISBN (Print) | 9781849198226 |
| DOIs | |
| Publication status | Published - 1 Jan 2016 |
Keywords
- Capacitor voltage balancing strategy
- CB-PWM
- Digital processor
- FC converter
- HVDC power transmission CHB converter
- HVDC transmission system
- LS-PWM
- MMC
- Modulation technique
- Multilevel converter topology
- NPC converter
- PS-PWM
- PWM power convertors
- SVM
- Three-level DCC converter
