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Nonlinear Control of Electronic Capacitor for Enhanced Stability and Dynamic Response | IEEE Journals & Magazine | IEEE Xplore

Nonlinear Control of Electronic Capacitor for Enhanced Stability and Dynamic Response


Abstract:

This article focuses on improving the control structure of electronic capacitor (EC), formed by a bidirectional dc-dc converter terminated with small auxiliary capacitanc...Show More

Abstract:

This article focuses on improving the control structure of electronic capacitor (EC), formed by a bidirectional dc-dc converter terminated with small auxiliary capacitance. Typical application of such a system is mimicking the dynamic behavior of a bulk dc-ink capacitor while actually employing a component with much lower capacitance value. It was previously revealed that EC may be treated as output-voltage regulated wide-input-range converter feeding a bidirectional power load. Dual-loop voltage-current linear cascaded regulator, typically employed for EC terminal voltage control, imposes slow unstable mode when absorbing power from the dc-link. This article demonstrates that performing a transformation from voltage-current to power-energy domain by feedback linearization-based nonlinear control simultaneously eliminates the unstable mode and increases control bandwidth. Revealed findings are well-supported by simulations and experiments.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 68, Issue: 8, August 2021)
Page(s): 6881 - 6892
Date of Publication: 10 June 2020

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