Abstract
The electrical power distribution system (EPDS) of the more electric aircraft (MEA) is a fundamental component that needs to be efficient and resilient. The commonly considered architectures feature separate buses to achieve separation between different subsections of the EPDS. Although effective, this implies an over design, since all subsections are sized for the local worst case scenarios. In the MEA concept, multiport converters could connect the whole EPDS while guaranteeing the galvanic isolation between buses. Since multiport converters would give rise to a completely different EPDS topology, dominated by power electronics interfaces, the stability of such a system must be assessed. This article investigates the input impedance of multiple active bridge (MAB) converters when interfaced with a single dc bus and multiple resistive loads. A transfer function-based input impedance model of the MAB converter is proposed. To validate the proposed input impedance model, the verification of input impedances of a triple active bridge (TAB) converter and a quadruple active bridge (QAB) converter is carried out using both simulation and experimental results.
Highlights
Nowadays, the concept of the more electric aircraft (MEA) has attracted more and more consideration by researchers, which is aimed at electrifying the subsystems on aircraft
Several projects have been started to achieve the electrification of subsystems on aircraft, such as Totally Integrated More Electric Systems (TIMES) sponsored by the Department of Trade and Industry (DTI) under the Civil Aircraft Research And technology Demonstration (CARAD) programme [1] and More Electric Initiative developed by the US Air Force Research Laboratory [2]
To assess the stability of DC systems based on impedance, the concept of minor loop gain (MLG) is introduced, which is the ratio of the output impedance ZO of source subsystem and the input impedance ZI of load subsystem
Summary
J., Buticchi, G., Gu, C., Gunter, S., Zhang, H., Wheeler, P. University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo, 315100, China. The work is licenced to the University of Nottingham Ningbo China under the Global University Publication Licence: https://www.nottingham.edu.cn/en/library/documents/researchsupport/global-university-publications-licence.pdf
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