Suppression of harmonic current in vector control for IPMSM by utilizing repetitive control

Generally, PMSM is driven by the vector control system based on the current control. However, in spite of using the vector control, there are harmonic components in the current control loop of vector control system due to several causes. Authors have proposed the suppression control method of harmonic current in the vector control system for IPMSM using the repetitive control with Fourier Transform. The proposed control method, however, was carried out individually for each harmonic current component with Fourier Transform and phase adjustment of compensational signals to stabilize the system, so that the process of learning compensation signal was complicated and required much calculation time on the DSP. In this paper, we propose a new control method suppressing all harmonic current components simultaneously without Fourier Transform and phase adjustment of compensational signal. So, the process of learning compensation signal and suppression harmonic currents becomes very simple and fast. The stability analysis shows that the new proposed control method keeps stability for all frequency domains. Experimental results are shown to confirm the effectiveness.