The invention discloses an energy conversion layered optimization 
control system and method for a wave energy power generation device. The 
system employs a three-layer 
system architecture, a layered 
control layer receives an 
electric energy dispatching instruction of an island 
microgrid, manages a function 
control layer, and also transmits the real-time operation condition of the wave energy powergeneration device to a 
monitoring system of the island 
microgrid, the function 
control layer receives a control instruction of the layered control layer and manages a function implementation layer ina unified mode, the function implementation layer comprises a wave energy capture 
system control unit, a hydraulic energy conversion system 
control unit and an 
electric energy conversion system 
control unit, power matching and operation optimization among the wave energy capture system, the hydraulic energy conversion system and the 
electric energy conversion system are realized, and the efficiency and 
controllability of the wave energy, the hydraulic energy and an electric energy multistage energy conversion system of the wave energy power generation device are improved, so that the 
controllability and stability of electric energy output of the wave energy power generation device are improved, and grid-connected coordinated operation of the wave energy power generation device from the island 
microgrid is facilitated.