A Rapid Output Disturbance Suppression Method for AFE Rectifier Unit Based on the New Load Current Feedforward

In order to reduce the excessive fluctuation of the DC-link voltage on the AFE rectifier unit output side caused by frequent load changes during ship crane operation, this paper proposes an improved load current feedforward control method. The model of the AFE rectifier unit based on the operating principles of ship crane is set up. The function between the feedforward decoupling reactive current and the converted DC-link voltage deviation is established, and the active current is compensated. By comparing the simulation of the proposed method with the conventional double closed loop SVPWM control strategy and the load current feedforward control method, results show that the new improved control method can both effectively reduce the voltage overshoot caused by sudden load changes and shorten the adjustment time. The method ameliorates the dynamic response characteristics, which achieves the rapid suppression of the output disturbance.