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

Energies

Gilney Damm¹  Gabriel R. Broday²  Luiz A. C. Lopes²  William Pasillas-Lépine³ 

[1] Department of Components and Systems (COSYS), University Gustave Eiffel, 93162 Paris, France;Department of Electrical and Computer Engineering, Concordia University, Montreal, QC H3G 1M8, Canada;Laboratory of Signals and Systems (L2S), University of Paris-Saclay, 91190 Paris, France;

关键词: bidirectional DC-DC converter;    DC microgrids;    energy storage systems;    feedback linearization;    multi-variable control;   

DOI  :  10.3390/en14237921

来源: DOAJ

【 摘 要 】

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 (V₂) becomes smaller than the input voltage (V₁). 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.

【 授权许可】

Unknown