Multisampling Control of Two-Cell Interleaved Three-phase Grid-connected Converters

This paper presents a multisampling control strategy for two-cell interleaved three-phase grid-connected converters in order to reduce the control delay and improve the stability margin. By sampling the currents at the point of common coupling, the average value can be acquired at the peak, valley and intersection points of all the phase-shifted carriers. Compared to the double-sampling double-update control, the bandwidth and dynamic performance improve with the same phase margin and no switching ripple is introduced at the same time. Finally, the effectiveness of the proposed control strategy is verified through the simulation and experimental results.