Abstract: Aiming at the issues of low observation accuracy and large chattering amplitude when using traditional sliding mode observer (SMO) control in dual three-phase permanent magnet synchronous generator rectifier systems, a control strategy based on an adaptive super-twisting sliding mode observer is proposed. This strategy uses an adaptive hyper spiral algorithm to estimate the back electromotive force of the input current and voltage values for each SVPWM cycle, and uses a phase-locked loop to estimate the rotor position and speed. Lyapunov stability analysis is adopted to conduct an in-depth analysis of the system, ensuring stable operation. Finally, the strategy is validated through simulations. The results demonstrate that this strategy can effectively improve the observation accuracy of the sliding mode observer, significantly suppress the chattering problem caused by the observer, and enable the rectifier system to output stable voltage waveforms.