“…The second stage, in case of controlled semiconductor devices, consists of a signal conditioning system and the required hardware for implementation of the converter controller (Bose, 2006). Recent advances in field programmable gate arrays (FPGAs) and digital signal processors (DSPs) allow the complexity and functionalities of the controllers employed in power converters to be increased and improved (Bueno et al, 2009). In grid-connected power converters these functionalities include, in most cases, the synchronization with the electrical grid, the evaluation of the reference current amplitude at the grid-side and current control (Kazmierkowski et al, 2002).…”