Research on real-time multi-rate simulation of voltage source converters

At present, there is a trade-off dilemma between accuracy and flexibility in real-time simulation on high frequency converters. To solve this problem, we introduced the real-time multi-rate co-simulation methods based on FPGA and PC, and fully demonstrated the simulation theory of the multi-rate co-simulation platform, design, and implementation of hardware architecture. Moreover, we researched 30 kHz/50 kHz three-phase two-level inverter case simulation, and presented the converter modelling, case model separation, and circuit solver implementation. Taking offline accurate simulation results for benchmark, we compared the simulation waveform, simulation errors, and real-time performances between multi-rate co-simulation platform and PC real-time simulation platform. Results show that, below the 50 kHz switching frequency, the speed transition error of multi-rate simulation method converges to zero, with electromagnetic transient Euclidean norm error of about 1%, and the simulation step of the platform can reach 500 nanosecond. This method can improve the accuracy of real-time simulation on high frequency converters, reduce the simulation step, and provide a reference for high performance co-simulation platform design.