Harmonic Current Suppression for Dual Three-Phase PMSM Based on Deadbeat Control and Disturbance Observer

Harmonic currents always exist in a dual three-phase permanent magnet synchronous machine due to the inverter nonlinearity, nonsinusoidal back-electromotive force, and external disturbances. This article proposes a deadbeat predictive harmonic current control (DPHCC) method to suppress the harmonic currents. The DPHCC method can directly calculate the harmonic control voltage based on the sampled harmonic currents and the machine model. Thus, the steady-state and transient-state performance of harmonic current control can be improved. Further, a disturbance observer is designed to avoid the influence of inaccurate machine parameters and other unmodeled disturbances. The observer is designed based on discrete-time sliding mode theory and an improved sliding mode reaching law. The stability of the observer has been analyzed, and the value range of the observer parameters has been determined theoretically. Finally, experimental results have been presented to verify the effectiveness of harmonic current suppression for the proposed control system.

Automated summary

Harmonic currents in dual three-phase permanent magnet synchronous machines are effectively suppressed using a deadbeat predictive harmonic current control (DPHCC) method. The DPHCC method calculates the harmonic control voltage based on sampled harmonic currents and the machine model, thereby improving both steady-state and transient-state performance. Additionally, a disturbance observer is implemented to handle inaccurate machine parameters and unmodeled disturbances, utilizing discrete-time sliding mode theory and an improved sliding mode reaching law. Experimental results confirm the effectiveness of the proposed control system in suppressing harmonic currents.