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The Modular Multilevel DC Converter With Inherent Minimization of Arm Current Stresses.
- Source :
-
IEEE Transactions on Power Electronics . Dec2020, Vol. 35 Issue 12, p12787-12800. 14p. - Publication Year :
- 2020
-
Abstract
- The modular multilevel dc converter (M2dc) is a partial power processing dc–dc converter that is gaining popularity for medium-voltage and high-voltage dc (HVdc) grid applications. However, internal ac current stresses go up as the step-down dc voltage ratio increases, leading to increased cost and losses, and ultimately renders the M2dc impractical for some applications. The HVdc autotransformer (AT) (HVdc-AT) is another class of the partial power processing dc–dc converter that circumvents this issue by using a transformer for interarm ac voltage matching, although the core must tolerate a very large dc voltage stress between windings that leads to increased magnetics size and weight. Interestingly, the M2dc does not suffer from interwinding dc voltage stresses. This article presents a new class of the partial power processing dc–dc converter that uses an integrated center-tapped transformer to merge the best traits of the M2dc and HVdc-AT. Comparative analysis reveals the proposed converter can minimize ac current stresses at all operating points while also achieving a significant reduction in transformer area product relative to the HVdc-AT. A dynamic controller is proposed that regulates dc power transfer while ensuring balanced capacitor voltages. The converter operation and dynamic controls are validated by simulation and experiment. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PICTURE archiving & communication systems
*COMPUTER performance
*DENDRITIC cells
Subjects
Details
- Language :
- English
- ISSN :
- 08858993
- Volume :
- 35
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Power Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 145130589
- Full Text :
- https://doi.org/10.1109/TPEL.2020.2992473