Small and Large Signal Models of Series Compensated WPT System

Speaker:  Chaoqun Qi

Time:       13:30-15:00 pm, Dec.21

Location:SIST 1C101

Host:       Minfan Fu

Abstract:

Wireless power transfer holds significant promise for facilitating high-efficiency wireless charging. As the spectrum of application scenarios broadens, the wireless power transfer system is inevitably exposed to diverse perturbations, giving rise to stability challenges. Small and large-signal models play a crucial role in assessing system stability across various control approaches and perturbations.

The extended describing function method proves to be an invaluable instrument for modeling resonant converters and has found application in the small-signal modeling of inductive power transfer systems. This modeling method relies on the first harmonic approximation as its foundational principle. Leveraging the extended describing function method enables the derivation of models for the inverter, resonant components, and rectifier, facilitating the synthesis of a comprehensive system model.

In this talk, a simplified small signal model for capacitive power transfer system and a linear large signal model for inductive power transfer system will be introduced. Both models possess the capability to accurately predict the dynamic responses of wireless power transfer systems under corresponding perturbations.

Bio:

Chaoqun Qi received his B.S. degree in electrical engineering from Jilin University, Changchun, China, in 2021. He is currently working toward the M.S. degree in power electronics from ShanghaiTech University, Shanghai, China.

He joined Advanced Electric Power Conversion Laboratory in September, 2021. His recent research interests include the modeling and control for wireless power transfer system.