What is the principle and efficiency of tidal power generation?

1) In a bay or tidal estuary, you can see the sea or river fluctuating twice a day, which is called tide in the morning and sunseeker at night. This phenomenon is mainly caused by the tidal force of the moon and the sun and the rotation effect of the earth. Tide is a kind of renewable energy with huge reserves, inexhaustible, no need for mining and transportation, clean and pollution-free To build tidal power stations, there is no need to emigrate or flood the land, and there is no problem of environmental pollution. In addition, it can also be combined with tidal power generation to develop comprehensive utilization projects such as reclamation, aquaculture and marine chemical industry. 2) The principle of tidal power generation is similar to that of ordinary hydropower generation. By leaving the reservoir, seawater is stored in the reservoir at high tide and stored as potential energy. Then, when the tide ebbs, seawater is released, and the turbine is driven to rotate by the difference of high and low tide levels, and the generator is driven to generate electricity. The difference is that seawater is different from river water, and the accumulated seawater has a small drop, but a large flow and is intermittent, so the turbine structure of tidal power generation should be suitable for the characteristics of low head and large flow. 3) Tidal power generation is a kind of hydroelectric power generation. Dams, gates and factories are built in conditional bays or tidal ports to form reservoirs, so that the water level of the reservoirs and the tidal level in the open sea form a certain tidal difference (i.e. working head), thus driving the hydro-generator set to generate electricity. 4) The technology related to tidal power generation has made rapid progress, and a variety of mechanical equipment for converting tidal energy into mechanical energy has been developed, such as propeller turbines, axial flow turbines and open cycle turbines. Japan even began to use satellites to provide tidal information. The utilization of tidal power generation is becoming more and more mature and has entered the practical stage.