基于比例谐振型自抗扰控制的永磁同步电机电流解耦及谐波抑制策略研究

In the field-oriented control of permanent magnet synchronous motor (PMSM), there are dq axis currents cross coupling effect and current harmonics which result from the inverter dead zone, motor magnetic field distribution harmonics, current sampling error, and etc. They affect severely the motor control performance. In this paper, a proportional resonance active disturbance rejection control (PR-ADRC) method for current loop control was proposed, which can effectively suppress current harmonics as well as dq axis currents decoupling. In order to eliminate the influence of motor parameter perturbation on the controller design, a stator resistance independent ADRC was derived from the motor model, and the proportional resonant term was introduced in the extended state observer. The resonant frequency can be set to the frequency of suppressed current harmonics. The suppression mechanism of current harmonics was explained through the analysis of the transfer function of the proposed PR-ADRC, and the parameter design method and stability proof of PR-ADRC were also given. Finally, the current decoupling and harmonic suppression effect of the proposed PR-ADRC were verified by experiments.