کنفرانس مهندسی برق ایران

صفحه اصلی / سی و چهارمین کنفرانس بین المللی مهندسی برق

Hybrid Control of CLLC Resonant Converters Based on Reduced-Order DPWA Models and LMI Analysis

نویسندگان :

Amirreza Marandi¹ Farzad Tahami²

1- Sharif university of technology 2- Sharif university of technology

کلمات کلیدی :

CLLC resonant converter،Reduced order model،piecewise affine mode(PWA)،Hybrid control،Linear Matrix Inequalities(LMI)

چکیده :

In this paper, a robust control modeling and design framework for CLLC resonant converter based on reduced piecewise linear model is presented. Due to its nonlinear nature and high dynamic order (fifth order), the CLLC converter complicates the controller design process and can lead to stability problems in the closed loop if the full model is used. In order to overcome this challenge, in this research, the order reduction method is used to derive a lower order piecewise linear model; in such a way that the dominant dynamics of the system are preserved and at the same time the computational complexity is significantly reduced. Based on the proposed reduced model, a robust output voltage controller is designed that is capable of accurately tracking the reference value in the presence of system parameter variations and load resistance uncertainties. The controller design is implemented based on the reduced hybrid model and the system stability proof is extracted and investigated in the form of linear matrix inequalities (LMI). In the previous paper, we showed that the reduced model reproduces the dynamic behavior of the CLLC converter with reasonable accuracy, and in this study, the proposed hybrid controller provides a desirable and stable performance in terms of transient response, voltage regulation accuracy, and resistance to parameter and load variations. The proposed framework provides an efficient and reliable approach for the control design of high-order resonant converters.