Lyapunov-based high performance controller for modular resonant DC/DC converters for medium voltage DC grids

Aboushady, Ahmed A. and Ahmed, Khaled Hani and Finney, Stephen J. and Williams, Barry W. (2017) Lyapunov-based high performance controller for modular resonant DC/DC converters for medium voltage DC grids. IET Power Electronics, 10 (15). 2055–2064. ISSN 1755-4543 (https://doi.org/10.1049/iet-pel.2017.0180)

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Abstract

This study presents a high-performance controller based on the Lyapunov stability criterion that enhances the dynamic performance and disturbance rejection capability of resonant DC/DC converters when compared with classical PI control. The series–parallel resonant converter (SPRC) is used as the candidate converter to which this controller design is applied but the design can be generalised to other types of resonant DC/DC converters. By using a multiple module approach, low-power modules of this resonant converter are stacked to enable operation at medium-voltage DC (MVDC). The proposed controller design is applied to modular structure of the SPRC to verify its high-performance output in conjunction with active sharing control loops that ensure uniform current/voltage distribution across the multiple interconnected modules. Detailed controller design, closed-loop stability criteria, robustness and parameter sensitivity are investigated and controller performance is compared and verified against the classical PI control in simulation and low-scaled experimental prototype. Operations in single-module and two-module input-series output-parallel modes are both studied. The study affirms the selection of the modular DC/DC converter architecture and its associated proposed controls for high-performance MVDC applications.

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