Method for the Real-Time Simulation of High Switching Frequency Power Electronic Converter Considering Switch Junction Capacitance

The high precision of the R-on / R-off model makes it suitable for the real-time simulation of high switching frequency power electronic converters (HSFPECs). However, the R-on / R-off model encounters two significant challenges: 1) Neglecting the switching transient process introduces inaccuracies in simulations. 2) Iterative operations when judging the switch status limit the switching frequency range. To address these issues, this paper proposes an improved method that incorporates the effects of switch junction capacitance. The calculated amount is significantly reduced by constructing an equivalent state equation without regarding junction capacitances as state variables and the switch status can be obtained by non-iterative operations. Moreover, this method can ensure the system stability by using backward Euler method and realizes the decoupling between the half-bridge arms, which greatly reduces the workload of judging the switch status for the R-on / R-off model. Finally, the field programmable gate array (FPGA) implementation scheme is presented, and an LLC resonant converter with 30 ns simulation time step and 250 kHz switching frequency is simulated on FPGA. The results derived from the real-time simulation and hardware experiment corroborate the effectiveness and accuracy of the proposed method.