Modeling Method for the Real-Time Simulation of Bridge-Based High-Switching-Frequency Power Electronic Converters
Zonghui Sun, Xizheng Guo, Shinan Wang, Yule Wang, Yongjie Yin, Xiaojie You
Abstract
The Ron/Roff model provides high accuracy in real-time simulation of high switching frequency power electronic converters. However, the iterative operations limit the application of the Ron/Roff model in high switching frequency domains. This paper presents a novel non-iterative method for determining the switch statuses of half-bridge arms. By predicting the state variables and correcting the switch status combinations in the natural commutation process with the status switching principle, accurate switch status can be obtained. Besides, this method adopts the backward Euler method to ensure the system stability and realizes the decoupling between the half-bridge arms, which greatly reduces the modeling complexity and calculation amount when judging the switch status. Finally, an ac-dc-ac topology with 100 kHz switching frequency and an LLC resonant converter with 250 kHz switching frequency are implemented on FPGA. The parallel solving architecture enables simulation time step as low as 25 ns. The results derived from the real-time simulation and hardware experiment corroborate low FPGA resource consumption and high precision of the proposed method.