Abstract
One of the main challenges of the solid-state transformer (SST) lies in the implementation of the dc-dc stage. In this paper, a quadruple-active-bridge (QAB) dc-dc converter is investigated to be used as a basic module of a modular three-stage SST. Besides the feature of high power density and soft-switching operation (also found in others converters), the QAB converter provides a solution with reduced number of high-frequency transformers, since more bridges are connected to the same multiwinding transformer. To ensure soft switching for the entire operation range of the QAB converter, the triangular current-mode modulation strategy, previously adopted for the dual-active-bridge converter, is extended to the QAB converter. The theoretical analysis is developed considering balanced (equal power processed by the medium-voltage (MV) cells) and unbalanced (unequal power processed by the MV cells) conditions. In order to validate the theoretical analysis developed in the paper, a 2-kW prototype is built and experimented.
| Original language | English |
|---|---|
| Article number | 7762728 |
| Pages (from-to) | 1243-1253 |
| Number of pages | 11 |
| Journal | IEEE Transactions on Industry Applications |
| Volume | 53 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Mar 2017 |
| Externally published | Yes |
Keywords
- DC-DC converter
- multiwinding transformer
- solid-state transformer (SST)
- triangular current modulation (TCM)
ASJC Scopus subject areas
- Control and Systems Engineering
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering