Abstract
The permanent magnet synchronous motor (PMSM) driven by the two-level voltage inverters features some drawbacks, such as dead-zone time, nonlinearity and other factors, leading to high amount harmonics in the stator currents. Additionally, the current harmonics amplitude will be decayed with the increasing of the harmonic order, and the main current harmonic components can be illustrated as 6th control signal harmonics. To improve the current harmonics suppression efficiency and maintain the simplicity of the PMSM driven system, the relationships between traditional repetitive controller and bandpass filter are analysed firstly. And then, a proportional–integral discrete Fourier transform repetitive control (PI-DFT-RC) scheme is proposed through adopting independent band-pass filters of state frequencies, which can provide infinite gain in stated frequency. Secondly, the discrete periodic signals for RC controller are analysed, and the lead step for DFT-RC controller is also studied, which can increase the signal tracking accuracy of the driven system. Furthermore, the stability of the driven system used PI-DFT-RC controller is analysed through Lyapunov theory. Finally, the effectiveness of the proposed PI-DFT-RC controller is verified by simulation results.
Published Version
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