Voltage allocation control for multi-module power conversion system with parallel-input and series-output connection

Author

Lin, R.-L. ; Liu, W.-S. ; Chen, Jiann-Fuh ; Chen, Ming-Hung ; Liu, Chien-Hung

Author_Institution

Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan

Volume

5

Issue

1

fYear

2012

fDate

1/1/2012 12:00:00 AM

Firstpage

86

Lastpage

94

Abstract

Voltage allocation (VA) is analysed for a multi-module power conversion system using a parallel-input and series-output (PISO) connection with different power ratings. In PISO system, the multi-module converters with different power ratings cannot regulate total output voltage when one of the series module is operated in its voltage limited mode. Therefore an automatic master loop regulation (AMLR) control scheme is proposed to allocate output voltage of individual modules, as well as to regulate total output voltage and achieve power management. Presented also is a green-mode control (AMLR+backup module) that could shield backup module in light-load to improve light-load efficiency. Finally, by using green-mode control, the experimental prototypes of three PISO forward modules with different power ratings are implemented in order to achieve VA mechanism. The efficiency of the multi-module PISO system with the proposed control scheme in the light-load is improved by over 12+, as compared to the conventional control scheme.

Keywords

load regulation; power conversion; power convertors; voltage control; PISO forward module; VA mechanism; automatic master loop regulation control scheme; green mode control; light load efficiency; multimodule PISO system; multimodule converter; multimodule power conversion system; parallel-input connection; power management; power rating; series module; series-output connection; total output voltage allocation control; voltage limited mode;

fLanguage

English

Journal_Title

Power Electronics, IET

Publisher

iet

ISSN

1755-4535

Type

jour

DOI

10.1049/iet-pel.2010.0092

Filename

6111540