The methodology followed was to design a single-phase system with one-third of the rated power, and then make the three-phase system out of it. The block diagram is shown below along with the simulation results.

Results

To summarize, the input current in the open-loop operation is highly distorted, and this is because of the high magnitudes of the low-order harmonics. After including the closed-loop operation, the Boost PFC circuit in CCM mode showed a significant improvement in the input current waveform. Additionally, the SEPIC converter was simulated as a PFC, and its results met the PF constraints. Comparing it to Boost-based PFC, SEPIC is better in terms of performance and the number of components, because Boost-based PFC requires an added stage of Buck DC-DC converter. However, generally, the closed-loop operations in both Boost and SEPIC PFC circuits met the standards and constraints in terms of the PF and THD. However, in DCM mode, unlike the Boost-based PFC, the SEPIC-based PFC met the standards with a smaller value of THD=2.53%

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