Control of cascaded DC-DC converter based hybrid battery energy storage systems - Part II: Lyapunov approach

Nilanjan Mukherjee, Danielle Strickland

Research output: Contribution to journalArticle

Abstract

A cascaded DC-DC boost converter is one of the ways to integrate hybrid battery types within a grid-tie inverter. Due to the presence of different battery parameters within the system such as, state-of-charge and/or capacity, a module based distributed power sharing strategy may be used. To implement this sharing strategy, the desired control reference for each module voltage/current control loop needs to be dynamically varied according to these battery parameters. This can cause stability problem within the cascaded converters due to relative battery parameter variations when using the conventional PI control approach. This paper proposes a new control method based on Lyapunov Functions to eliminate this issue. The proposed solution provides a global asymptotic stability at a module level avoiding any instability issue due to parameter variations. A detailed analysis and design of the nonlinear control structure are presented under the distributed sharing control. At last thorough experimental investigations are shown to prove the effectiveness of the proposed control under grid-tie conditions.
Original languageEnglish
Pages (from-to)3050-3059
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Volume63
Issue number5
Early online date22 Dec 2015
DOIs
Publication statusPublished - May 2016

Bibliographical note

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Funding: EPSRC (EP/1008764/1 and EP/13764)

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