Hydraulic transmission system of power decoupling type wave power generating device and control method of hydraulic transmission system

The invention discloses a hydraulic transmission system of a power decoupling type wave power generating device and a control method of the hydraulic transmission system of the power decoupling type wave power generating device. The transmission system is composed of an energy capturing unit, a pressure protection unit, a rectification unit, a voltage transformation unit, a speed regulating unit, an energy storage unit and a power generating unit. According to the hydraulic voltage transformation principle and the transmission system of the device, shaft connection is conducted on a hydraulic motor and a variable pump, low-voltage and large-flow input power is converted into high-voltage and small-flow output power, and therefore output power is more suitable for transmission and control; meanwhile, according to the control method, the voltage transformation ratio is adjusted in real time according to different operation sea conditions to stabilize the output rotation speed of the hydraulic motor and the output rotation speed of an electric generator, a high-voltage bag type accumulator is used for further stabilizing voltage fluctuation, conversion from a voltage transformation network to a quasi-constant-voltage network is achieved, and power coupling of input and output of the transmission system of the wave power generating device is achieved.