Hydraulic transmission-based method and device for storing energy and realizing stabilized voltage and constant frequency in wave power generation

Abstract

The invention discloses a hydraulic transmission-based method and a hydraulic transmission-based device for storing energy and realizing stabilized voltage and constant frequency in wave power generation. In the device, a floating pendulum is connected with a hydraulic cylinder, high pressure oil outputted by a non-rod cavity of the hydraulic cylinder enters a high pressure energy storing device and an oil inlet of a variable motor through a control integrated valve and through a high pressure oil tube, low pressure oil outputted by an oil outlet of the variable motor enters a low pressure big-capacity energy storing device and returns to the rod cavity of the hydraulic cylinder through the control integrated valve, the main shaft of the variable motor is connected with a permanent magnet synchronous generator, and the permanent magnet synchronous generator is connected to a rectifying module and a direct-current electric energy charging-discharging control module and then connected to a stepless unload adjustable load and a storage battery. The high pressure energy storing device and the low pressure big-capacity energy storing device realize the energy storage by absorbing the fluctuation, caused by the change of transient waves, of pressure and flow rate. A controller realizes the pressure stabilization constant frequency by the stepless unload adjustable load and the displacement of the hydraulic motor respectively. The device has the advantage of making the wave power generating device output more smoothly, more free from influence of the wave impact and have higher efficiency.

Description

technical field [0001] The invention relates to an energy storage voltage stabilization constant frequency method and a device thereof for a power generation system, in particular to a hydraulic transmission based wave power generation energy storage voltage stabilization constant frequency method and a device thereof. Background technique [0002] At present, in the wave energy utilization devices that have been commercialized at home and abroad, the power transmission method is grid-connected, and the small-capacity unstable power is absorbed through the large-capacity power grid. However, wave energy utilization power generation devices are generally built in remote areas or offshore away from the power grid. Power generation to the grid means that expensive long-distance cables or submarine cables are required. Obviously, compared with wave energy generation devices with limited power generation capacity, long-distance power transmission Not an economical option. Theref...

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Problems solved by technology

Obviously, in such a complex system as a wave power generation device, without the function of the electrical automatic control system, relying solely on the accumulator cannot truly fully realize the efficient and stable power generation of the wave power generation device.

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