Multifrequency approximation and average modelling of an isolated bidirectional dc–dc converter for dc microgrids. Issue 6 (1st May 2016)

• Record Type: Journal Article
• Authors: Huang, Jun; Wang, Yue; Li, Zhuoqiang; Lei, Wanjun
• Is Part Of: IET power electronics. Volume 9:Issue 6(2016)
• Page Start: 1120
• Page End: 1131
• Publication Date: 2016-05-01
• Subjects: distributed power generation -- DC‐DC power convertors -- transfer functions -- closed loop systems -- power distribution control -- power generation control; dc microgrids -- isolated bidirectional dc‐dc converter -- multifrequency approximation -- generalised analysis -- triple phase shift control -- TPS control -- numerical solver -- optimised modulation scheme -- transmission power -- voltage conversion ratio -- multifrequency average model -- universal control‐to‐output‐voltage transfer function -- closed‐loop operation; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2015.0417
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : This study presents a generalised analysis of isolated bidirectional dual active bridge (DAB) dc–dc converter with triple‐phase‐shift (TPS) control. The multifrequency approximation is used to analyse performance characteristics of DAB, and a novel numerical solver is developed to determine the optimised modulation scheme based on TPS control. Specially, the proposed solver can be considered as a unified solver for determining the optimised operation of DAB with required transmission power and voltage conversion ratio. The multifrequency average model of DAB is then described in this study. A universal control‐to‐output‐voltage transfer function is derived for DAB with any modulation scheme, and the closed‐loop operation is discussed based on the proposed average model. Finally, a laboratory prototype is implemented and experimental results verify the theoretical analysis.