Fidelity Assessment of Real-Time Simulation for High-Frequency Resonant Converter Applications

This paper presents an FPGA-based real-time simulation approach for high-frequency resonant DC-DC converters used in hybrid electric aircraft. The proposed solution combines switching signal oversampling with a 5th-order PADE numerical integration method to accurately simulate CLLC and LLC resonant converters in Hardware-in-the-Loop (HIL) environments. Validation against offline PLECS simulations shows simulation errors below 2%, demonstrating high-fidelity real-time performance suitable for controller validation and converter development.