Cross-flow water turbines represent a potential renewable energy resource which needs more exploring study and eventually real scale finality. Cross-flow water turbines harvest the water kinetic energy. Somehow equivalents to wind turbines these water turbines are more compact at equal power as water is a thousand times denser than air. The study here presented is part of a multidisciplinary research program focused on the HARVEST concept. The latter is based on vertical structure composed of piled up Achard turbines locked on the same rotational shaft. This Ph.D. thesis concerns electrical generation issues and its main developed topics are control possibilities of this generation system in a grid connected or islanded mode of operation.
