Repetitive Control with Adaptive Sampling Frequency for Distributed Power Generation Systems

M. A. HERRÁN; S. A. GONZÁLEZ; J. R. FISCHER; M. G. JUDEWICZ; I. CARUGATI; D. O. CARRICA

San Carlos de Bariloche

Congreso; XV Reunión de Trabajo en Procesamiento de la Información y Control; 2013

Universidad Nacional de Rio Negro

A new repetitive control (RC) for Distributed Power Generation Systems which achieves optimal performance in steady state conditions due to a variable sampling/switching period technique (VSPT) is presented. The main objective of VSPT is to obtain an integer number of samples per grid period, which solves the main problem of RC: the loss of rejection to periodic disturbances due to grid frequency drift. The sampling/switching frequency is adjusted with a variable sampling period filter phase-locked loop (VSPF-PLL), which also adds robustness to the system due to its inherent tolerance to grid voltage distortion and unbalances, and events like frequency steps and faults.