Fast-Scale Instability and Stabilization by Adaptive Slope Compensation of a PV-Fed Differential Boost Inverter

Numerical simulations reveal that a single-stage differential boost AC module supplied from PV under an Maximum Power Point Tracking (MPPT) control at the input DC port and with current synchronization grid might exhibit bifurcation phenomena some weather conditions leading to subharmonic oscillation fast-switching scale. This paper will use discrete-time approach characterize such behavior identify onset of fast-scale instability. Slope compensation is used in inner loop improve stability system. The slope values needed guarantee for full range operating duty cycle optimal deadbeat response are determined. validity followed procedures finally validated by numerical performed on detailed circuit-level switched model module.