  The Controller Hardware_in_the_loop (CHIL) simulation is gaining popularity
as a cost_effective, efficient, and reliable tool in the design and development
process of fast_growing electrified transportation power converters. However,
it is challenging to implement the conventional CHIL simulations on the railway
power converters with complex topologies and high switching frequencies due to
strict real_time constraints. Therefore, this paper proposes an event-based
synchronization CHIL (ES_CHIL) framework for high_fidelity simulation of these
electrified railway power converters. Different from conventional CHIL
simulations synchronized through the time axis, the ES_CHIL framework is
synchronized through the event axis. Therefore, it can ease the real_time
constraint and broaden the upper bound on the system size and switching
frequency. Besides, models and algorithms with higher accuracy, such as the
diode model with natural commutation processes, can be used in the ES-CHIL
framework. The proposed framework is validated for a 350 kW wireless power
transformer system containing 24 fully controlled devices and 36 diodes by
comparing it with Simulink and physical experiments. This research improves the
fidelity and application range of the power converters CHIL simulation. Thus,
it helps to accelerate the prototype design and performance evaluation process
for electrified railways and other applications with such complex converters.
