Model-free predictive current control of three-phase PWM rectifier based on discrete space vector
Aiming at the problem that the model predictive control of PWM rectifier is highly dependent on the accuracy of system parameters,a model-free predictive current control(MFPCC)strategy based on discrete space vector was proposed.Through vector synthesis,two basic vectors were applied in each control period to improve the accuracy of current prediction;Based on peak and valley sampling,the cur-rent gradient of the two applied basic vectors in the previous control period was measured and stored re-spectively;And by establishing the current gradient equations,so as to further update the current gradi-ent of the remaining 6 non-applied vectors according to the current gradient of the applied vector.The proposed method has strong robustness,and eliminates the stagnation effect in conventional MFPCC,and reduce current harmonics.Finally,effectiveness and advantages of the proposed method are verified by experiment and simulation.
PWM rectifiermodel-free predictive current controldiscrete space vectorcurrent gradient updatingstagnation phenomenon
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