Three-phase voltage-type PWM rectifier based on adaptive tracking control

Parametric uncertainties generated by switching devices' equivalent resistance, inductive resistance and frequency of the three-phase voltage-type pulse width modulation (PWM) rectifier, have brought about large steady-state error. To cope with this problem, an adaptive tracking control for the three-phase voltage-type PWM rectifier was proposed. The modeling of the three-phase PWM rectifier was analyzed to prove that the model, which belongs to the under-actuated system, meets the conditions of the L₂-gain disturbance attenuation theory, meanwhile, it acquires the adaptive law of the adaptive tracking control of the three-phase voltage-type PWM rectifier based on the L₂-gain disturbance attenuation theory. Digital simulation and practical experimental results showed that the proposed method can achieve unity power factor control, fast dynamic response and zero steady-state error. It also possesses the property of good self-adaptability and robustness, especially to deal with the uncertainties of AC frequency and AC equivalent resistance.