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Hysteresis Band Current Controller for 12-Pulse Rectifier with less Than 3% Current THD Under Variable Loads

In this paper, a 12-pulse rectifier topology with hysteresis controller is presented that has a harmonic of less than 3% input current total harmonic distortion. The designed rectifier has two diode bridges each connected to a Boost converter. The autotransformer is used as a phase shift transformer, which leads to a noticeable decrease in transformer volume. The Boost converter inductor current is computed from the theoretical equations for conditions where the input current is sinusoidal. Then, this current is implemented by the hysteresis controller. The designed controller has good flexibility and can be used in a different operating conditions. The simulation results show that the THD of the input current using the proposed rectifier is lower than 3% with hysteresis controller.