Harmonic Calculation of Parallel Interleaved Voltage-Source Converters in Digital Systems

Parallel converters are gaining popularity in industrial applications. However, analytical models for the harmonic calculation in digital systems have not received much attention. This paper considers the effect of nonlinear factors on modulation and output harmonics, analyzes the mechanism of harmonic generation, thus proposing an accurate harmonic calculation model in the parallel interleaved VSCs system under digital control. The model can accurately calculate the amplitude and phase of each harmonic, which provides a theoretical foundation for compensating specific harmonics and the optimization of interleaving angles. The accuracy of the calculation model is experimentally verified.