Frequency-Adaptive Virtual Variable Sampling-Based Selective Harmonic Repetitive Control of Power Inverters

Due to the n-pulse commutation, power harmonic distortions caused by inverters usually concentrate on particular (nk±m)-order frequencies. The conventional repetitive control (RC) uses an identical gain equally compensate for at all This leads slow dynamics as it fails optimize convergence rate of RC dominant selective (SHRC) can efficiently suppress distortions. However, ratio sampling SHRC fundamental frequency must be integer. severely limits use and lowers performance with a fixed in presence variations interested harmonics. To address this problem, article proposes frequency-adaptive virtual variable sampling-based (FA-VVS-SHRC) scheme that is immune issue fractional proposed FA-VVS-SHRC provide flexible phase-led compensation achieve accurate variations. Moreover, low-cost easy-to-implement solution does not require hardware modifications. Experiments three-phase inverter comparison studies are presented verify its effectiveness.