Harmonic Suppression Strategy Of 12-Pulse Controlled Rectifier

In order to improve the harmonic suppression ability of 12-pulse controlled rectifier, a DC-side harmonic suppression scheme based on predictive current control strategy is studied. The control strategy improves the input current waveform of the rectifier by adding a boost converter circuit on the DC-side to meet the requirements of input current harmonic suppression under different load conditions. According to the current relationship between AC and DC sides of 12-pulse rectifier and the ideal current waveform at DC side, this paper analyzes and gives the input current waveform of boost converter circuit, and uses PWM method to adjust the input current of boost converter. Simulation results show that this method can effectively suppress the input current harmonics of 12-pulse controlled rectifier.