Continuous SVM strategy with current sector control concept for a three-phase three-level PFC rectifier

In this paper, a control algorithm of a three-phase three-level power factor correction (PFC) rectifier, using a mathematical analysis of continuous space vector modulation (CSVM) is presented. The proposed control scheme, in order to generate the duty cycle signals for each switching device with no need of to determine the direction of line currents and sector of vectors, only to recognize the angle of the input reference voltage, is developed. For this proposal, the operating constraints of the three-phase three-level rectifier with the two-level space vector modulation strategy are examined carefully, and the proposed control algorithm ensures that the input line currents are in phase with the respective voltages. Simulation and calculation results can confirm the feasibility of the control algorithm and performance of the proposed rectifier.