Research on PMSM Control Based on Improved Sliding Mode Observer
To address the issue of high-frequency oscillations generated when introducing switching functions in tradi-tional sliding mode observers,this paper proposes a solution based on a fourth-order sliding mode observer.This solution eliminates the use of sliding mode switching functions,thereby reducing the interference of high-frequency signals in the process of back electromotive force information extraction.The stability of the observer is proven by using a Lyapunov function.In order to further reduce the interference of high-frequency signals,a second-order generalized integrator(SOGI)is introduced to notch-filter non-fundamental signals.This method largely preserves the fundamental information of the back electromotive force.In addition,this paper uses a phase-locked loop method to extract rotor position information,thus avoiding division operations in the use of the arctangent method.
fourth-order sliding mode observersecond order generalized integratorphase locked loopSimulink simulation
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