A Unified Controller for Multi-State Operation of the Bi-Directional Buck–Boost DC-DC Converter

Gabriel R. Broday, Gilney Damm, William Pasillas-Lépine and Luiz A. C. Lopes
Additional contact information
Gabriel R. Broday: Department of Electrical and Computer Engineering, Concordia University, Montreal, QC H3G 1M8, Canada
Gilney Damm: Department of Components and Systems (COSYS), University Gustave Eiffel, 93162 Paris, France
William Pasillas-Lépine: Laboratory of Signals and Systems (L2S), University of Paris-Saclay, 91190 Paris, France
Luiz A. C. Lopes: Department of Electrical and Computer Engineering, Concordia University, Montreal, QC H3G 1M8, Canada

Energies, 2021, vol. 14, issue 23, 1-21

Abstract: DC grid interfaces for supercapacitors (SCs) are expected to operate with a wide range of input voltages with fast dynamics. The class-C DC-DC converter is commonly used in this application because of its simplicity. However, it does not work if the output voltage ( V 2 ) becomes smaller than the input voltage ( V 1 ). The non-isolated bi-directional Buck–Boost DC-DC converter does not have this limitation. Its two half-bridges provide a means for controlling the power flow operating in the conventional dual-state mode, as well as multi-state, tri, and quad modes. These can be used for mitigating issues such as the Right Half Plane (RHP) zero that has a negative impact on the dynamic response of the system. Multi-state operation typically requires multi-variable control, which is not easy to realize with conventional PI-type controllers. This paper proposes a unified controller for multi-state operation. It employs a carrier-based modulation scheme with three modulation signals that allows the converter to operate in all four possible states and eight different modes of operation. A mathematical model is developed for devising a multi-variable control scheme using feedback linearization. This allows the design of control loops with simple PI controllers that can be used for all multi-state modes under a wide range of operating conditions with the same performance. The proposed scheme is verified by means of simulations.

Keywords: bidirectional DC-DC converter; DC microgrids; energy storage systems; feedback linearization; multi-variable control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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