Stability Analysis and Optimal Design for Virtual Impedance of 48 V Server Power System for Data Center Applications

In the past literature on virtual impedance to series systems, most of the discussion focused on stability without in-depth research on the system design of the series converter and the overall output impedance. Accordingly, this study takes an open-loop resonant LLC converter series-connected close...

Full description

Bibliographic Details
Main Authors:	Chien-Chun Huang, Sheng-Li Yao, Huang-Jen Chiu
Format:	Article
Language:	English
Published:	MDPI AG 2020-10-01
Series:	Energies
Subjects:	output impedance stability analysis virtual impedance
Online Access:	https://www.mdpi.com/1996-1073/13/20/5253

id	doaj-c07c8d2cb3f64dca8dab5013f98cf92a
record_format	Article
spelling	doaj-c07c8d2cb3f64dca8dab5013f98cf92a2020-11-25T03:40:33ZengMDPI AGEnergies1996-10732020-10-01135253525310.3390/en13205253Stability Analysis and Optimal Design for Virtual Impedance of 48 V Server Power System for Data Center ApplicationsChien-Chun Huang0Sheng-Li Yao1Huang-Jen Chiu2Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanIn the past literature on virtual impedance to series systems, most of the discussion focused on stability without in-depth research on the system design of the series converter and the overall output impedance. Accordingly, this study takes an open-loop resonant LLC converter series-connected closed-loop Buck converter as an example. First, the conditions required for the direct connection of the small-signal model in the series, the effect of feedback compensation on the input impedance of the load stage, the operating frequency, and passive components of the two-stage converter are discussed in detail―the relationship between the matching and the output impedance. Afterwards, a mathematical model is used to discuss the effect of adding parallel virtual impedance on the output impedance of the overall series converter and then derive an optimized virtual impedance design. Finally, an experimental platform of 48 V to 12 V and maximum wattage of 96 W are implemented. The output impedance of the series converter is measured with an impedance analyzer to verify the theoretical analysis proposed in this paper.https://www.mdpi.com/1996-1073/13/20/5253output impedancestability analysisvirtual impedance
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Chien-Chun Huang Sheng-Li Yao Huang-Jen Chiu
spellingShingle	Chien-Chun Huang Sheng-Li Yao Huang-Jen Chiu Stability Analysis and Optimal Design for Virtual Impedance of 48 V Server Power System for Data Center Applications Energies output impedance stability analysis virtual impedance
author_facet	Chien-Chun Huang Sheng-Li Yao Huang-Jen Chiu
author_sort	Chien-Chun Huang
title	Stability Analysis and Optimal Design for Virtual Impedance of 48 V Server Power System for Data Center Applications
title_short	Stability Analysis and Optimal Design for Virtual Impedance of 48 V Server Power System for Data Center Applications
title_full	Stability Analysis and Optimal Design for Virtual Impedance of 48 V Server Power System for Data Center Applications
title_fullStr	Stability Analysis and Optimal Design for Virtual Impedance of 48 V Server Power System for Data Center Applications
title_full_unstemmed	Stability Analysis and Optimal Design for Virtual Impedance of 48 V Server Power System for Data Center Applications
title_sort	stability analysis and optimal design for virtual impedance of 48 v server power system for data center applications
publisher	MDPI AG
series	Energies
issn	1996-1073
publishDate	2020-10-01
description	In the past literature on virtual impedance to series systems, most of the discussion focused on stability without in-depth research on the system design of the series converter and the overall output impedance. Accordingly, this study takes an open-loop resonant LLC converter series-connected closed-loop Buck converter as an example. First, the conditions required for the direct connection of the small-signal model in the series, the effect of feedback compensation on the input impedance of the load stage, the operating frequency, and passive components of the two-stage converter are discussed in detail―the relationship between the matching and the output impedance. Afterwards, a mathematical model is used to discuss the effect of adding parallel virtual impedance on the output impedance of the overall series converter and then derive an optimized virtual impedance design. Finally, an experimental platform of 48 V to 12 V and maximum wattage of 96 W are implemented. The output impedance of the series converter is measured with an impedance analyzer to verify the theoretical analysis proposed in this paper.
topic	output impedance stability analysis virtual impedance
url	https://www.mdpi.com/1996-1073/13/20/5253
work_keys_str_mv	AT chienchunhuang stabilityanalysisandoptimaldesignforvirtualimpedanceof48vserverpowersystemfordatacenterapplications AT shengliyao stabilityanalysisandoptimaldesignforvirtualimpedanceof48vserverpowersystemfordatacenterapplications AT huangjenchiu stabilityanalysisandoptimaldesignforvirtualimpedanceof48vserverpowersystemfordatacenterapplications
_version_	1724534056964587520

Stability Analysis and Optimal Design for Virtual Impedance of 48 V Server Power System for Data Center Applications

Similar Items