A Linearized Large Signal Model of an LCL-Type Resonant Converter

Energies

Hong-Yu Li²  Xiaodong Li¹  Ming Lu²  Song Hu² 

[1] Faculty of Information Technology, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau SAR, China;

关键词: resonant converter;    multi-frequency modeling;    soft-switching;   

DOI  :  10.3390/en8031848

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland