Design of grid-connected directly driven wave power generation system with optimal control of output power

This paper presents a directly driven wave power generation system which is connected to power grid composed of permanent magnetic linear generator(PMLG), generator side converter, grid side converter, controller and grid. Control strategies based on back to back converter structure was proposed: vector decoupling control was used to generator side converter aiming at optimize power extraction from wave energy; Grid voltage oriented control was used to grid side converter in order to make the current sinusoidal and realize unit power factor control. Since the DC link voltage has fluctuation using traditional method, a method with power feed forward was proposed to keep the DC link voltage stable and improve the dynamic response of the system. A simulation model was built for the whole system in Matlab/Simulink and simulation results verified that the proposed control strategy is feasible and effective.