Abstract
This paper presents an approach to achieve maximum conversion efficiency of a two-staged-cascaded ac-dc converter. In this study, the integrated ac-dc converter consists of a three-phase boost-type power factor correction rectifier and a phase-shifted full-bridge dc-dc converter. The detailed loss modeling of the integrated stage implies that the total power loss varies in a nonmonotonic fashion with intermediate dc-link voltage. In order to ensure maximum conversion efficiency, an optimum dc-link voltage level can be set depending on the load power level. A comparison between the efficiency variation under two different cases is carried out with extensive mathematical analyses: 1) fixed dc bus and 2) variable dc-bus voltage control. In addition, the experimental results obtained from a 6-kW-integrated ac-dc hardware prototype show a unity power factor along with a peak efficiency of 97.2%, which is 2.5% more than the fixed dc-link control approach.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 8408-8421 |
| Number of pages | 14 |
| Journal | IEEE Transactions on Industrial Electronics |
| Volume | 65 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 2018 |
| Externally published | Yes |
Keywords
- AC-DC
- integrated
- maximum efficiency
- power factor correction
- three-phase
- variable DC link
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering