A Novel Control Scheme for the Electric Motor Emulator to Improve the Voltage Emulation Accuracy

An electric motor emulator (EME) is being prevalently used during the testing process of the motor drive unit for electric vehicle applications. Most of the existing research works focus on the improvement and analysis of the terminal current emulation accuracy of the EME, whereas research on the emulation accuracy of the EME terminal voltage is rare. The purpose of this article is to cope with the distortion of the EMEs terminal voltage at high modulation index due to the parasitic capacitance and deadtime of the emulator converter. A novel control scheme based on an active circulation regulation approach and a switched-mode modulation strategy is proposed in this article. The proposed control scheme is aimed at the commercial EME with the parallel-branch converter. Both simulations and experiments are carried out based on a prototype power topology, validating the effectiveness of the proposed control scheme in improving the voltage emulation accuracy of the EME.