A Linearized Large Signal Model of an LCL-Type Resonant Converter
Faculty of Information Technology, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau SAR, China
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Academic Editor: Frede Blaabjerg
Energies 2015, 8(3), 1848-1864; https://doi.org/10.3390/en8031848
Received: 10 January 2015 / Revised: 27 February 2015 / Accepted: 27 February 2015 / Published: 5 March 2015
In this work, an LCL-type resonant dc/dc converter with a capacitive output filter is modeled in two stages. In the first high-frequency ac stage, all ac signals are decomposed into two orthogonal vectors in a synchronous rotating d–q frame using multi-frequency modeling. In the dc stage, all dc quantities are represented by their average values with average state-space modeling. A nonlinear two-stage model is then created by means of a non-linear link. By aligning the transformer voltage on the d-axis, the nonlinear link can be eliminated, and the whole converter can be modeled by a single set of linear state-space equations. Furthermore, a feedback control scheme can be formed according to the steady-state solutions. Simulation and experimental results have proven that the resulted model is good for fast simulation and state variable estimation.
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Keywords:
resonant converter; multi-frequency modeling; soft-switching
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MDPI and ACS Style
Li, H.-Y.; Li, X.; Lu, M.; Hu, S. A Linearized Large Signal Model of an LCL-Type Resonant Converter. Energies 2015, 8, 1848-1864.
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