What are the ocean energy power generation technologies?

Tidal power generation needs to build a reservoir to form a water head and keep the water level stable, and use the water level difference to generate electricity. Tidal power generation includes single-reservoir unidirectional power station, single-reservoir bidirectional power station and double-reservoir bidirectional power station. (1) single reservoir single scheme: there is only one reservoir, and the turbine is unidirectional, generating electricity at low tide. Its working process is to feed water at high tide without generating electricity, because the water level difference is not enough and the turbine is unidirectional. When the tide ebbs, don't generate electricity first. When the tide ebbs, power can only be generated if it drops to a certain extent and the water level difference with the reservoir is enough. The whole process is discontinuous, but the power generation process is stable. (2) Single-reservoir and double-program: A reservoir uses a bidirectional turbine to generate electricity at high tide and low tide. Its working process is that it does not enter the water when the tide is high. Because it is a two-way turbine, it will generate electricity only when there is a certain water level difference, and it will also inject water into the reservoir. At low tide, the power generation will stop when the water level difference of the reservoir is not enough, and the turbine will run in reverse to generate electricity until there is enough water level difference. (3) Double-reservoir type: both reservoirs generate electricity during ebb and flow. Its working process is one high and one low, which increases the water level regulation ability and realizes uninterrupted power generation. Water always flows from the high reservoir to the low reservoir, and power generation is also one-way. If the inlet valve and outlet valve are properly controlled, the head of the turbine can be kept stable. B. Ocean energy turbine generator set (1) axial flow turbine generator set. The shaft of the turbine is vertical, and water flows in from the direction of the blades on the side, changes direction and flows out along the lower part of the shaft. The generator is vertical and coaxial with the turbine. This is an old-fashioned generator set with low efficiency and low power, but long service life. (2) Tubular turbine unit. The turbine and generator are installed in the horizontal direction, connected by belts in the vertical shaft, and a gearbox is installed in the middle. Water falls through the gate runner, changes direction, and flows out through the horizontal blades. It is characterized by low efficiency, simplicity and easy installation and maintenance. (3) Streamlined bulb tubular turbine. Like a smooth light bulb or bomb, it is completely closed and installed horizontally. The big end is equipped with a generator and the small end is equipped with a turbine. The water flows through the sealed generator at the big end and then flows to the turbine. Although the device occupies a large volume, it is highly efficient due to the compact coaxial generator and turbine. The disadvantage is that the whole generator is inconvenient to seal and maintain underwater, and the generator loses energy in the flow channel. (4) Full penetration hydraulic turbine. The turbine and rotor are installed in the flow passage, which has small resistance and high efficiency; The stator is installed outside the flow channel. (5) Domestic hydraulic turbines. The bulb tubular unit has the advantages of wide applicable head range, high efficiency and stable operation. Power station construction occupies less land and has less immigrants, which is very beneficial to reducing project cost and improving economic benefits, and has broad market prospects. C. Wave power generation (1) generally has four ways to collect wave kinetic energy: a. Movement, collecting mechanical energy in a certain direction. B. Oscillating type, which changes the vibrating water column into a variable gas column and has an oscillating cavity. If resonance can be generated, the effect will be better, and vibration can be easily converted into rotation. C. Water flow pattern, which can be used as driving force by changing the shape of water flow to form pressure difference. D. pressure type, relatively intuitive, directly using wave compressed air as power. (2) After proper conversion, it becomes the power to drive the turbine. This conversion method is roughly as follows: a. Mechanical, with gears and levers; B. hydraulic drive, using hydraulic system; C. pneumatic, using an air pump.