Self-Excited Current Reference for Power-Electronics-Based Electric Machine Emulator

With the widespread use of electric machines in renewable energy generation and electrical vehicles, the mission profiles of the electric machines are getting complicated, which leads to the urgent need to characterize the reliability of the electric machine drive system. Thus, the power-electronics-based electric machine emulator is introduced, where the terminal voltage of the driving converter is sensed for current reference generation of the emulator. However, in this conventional control structure, the stability and accuracy of the machine emulator is compromised due to the low-pass filter during the voltage sensing process. In this paper, the low-pass filter during the voltage sensing process is removed. The terminal voltage of the driving converter is reconstructed by the sampled current, and the current reference for the emulator is reconstructed by the modulation signal of the emulating converter, achieving better performance and stability. Simulation and experimental results are provided to validate the proposed idea.