advantage:
1. Tidal energy is a renewable energy source that is clean, does not pollute the environment and does not affect the ecological balance. The tides fluctuated daily, and they were repeated and inexhaustible. It can fully develop into an important supplementary energy source for life, production, and defense in coastal areas.
2. It is a relatively stable and reliable source of energy. It is rarely affected by natural factors such as climate and hydrology. The total power generation is stable throughout the year, and there is no impact on abundance or dry years and abundance or dry periods.
3. Tidal power plants do not need to inundate a large number of farmland to form a reservoir. Therefore, there are no complicated issues such as population migration and submergence of farmland. In addition, it can be used to block sea dams, promote siltation and cofferdams, and combine aquaculture, water conservancy, marine chemicals, and transportation to achieve comprehensive utilization. This is a prominent advantage for the coastal areas where people are more and less land and farmland is very valuable.
4. Tidal power plants do not need to build high dams. Even if natural disasters such as wars or earthquakes occur, the dams will be damaged and will not cause serious disasters to the downstream cities, farmland, and people’s lives and properties.
5, Chaoshan can develop a combination of primary energy and secondary energy, no fuel, not affected by primary energy prices, and low operating costs, is an economic energy. However, like the Hechuan hydropower station, there is a large investment and low cost of power generation.
6, the number of units, do not set standby units.
Disadvantages:
1, tidal range and water head often change in a day, in the absence of special adjustment measures, there is intermittent output, causing inconvenience to the user. However, it is possible to formulate an operational plan in advance for tidal forecasting and to operate with the large grid in order to overcome its intermittent nature.
2. There is a half-month change in tides, and the tidal range can be twice the difference. Therefore, the annual utilization hours for ensuring output and installation are also low.
3. Chaoshan Power Station is built in the Haikou Bay, usually with long water depth dams, and it is difficult to deal with problems such as construction, foundation treatment, and silt prevention. Therefore, civil engineering and mechanical and electrical investment are large and the cost is high.
4. Chaoshan Power Station is a form of power generation with low head and large flow. In the opposite direction of the ebb and flow, enemy water turbines are bulky and consume large amounts of steel, and the structure of water inlet and outlet buildings is complex. Moreover, due to immersion in seawater, seawater and marine organisms have corrosion and contamination effects on metal structures and offshore structures, and need special anticorrosion and marine biological adhesion treatment.
5. The cycle of tidal changes is lunar day (24h50min), the monthly cycle is about 14 days, and the climax lags about 50min every day. Therefore, it is poorly coordinated with the electricity load chart given on the day of the sun. Although tidal power has the above deficiencies, it can be improved with the continuous improvement of modern technology. Such measures as bi-directional or multi-reservoir power generation, use of pumped storage, and adjustment of Nazha power grid can make up for the first drawback; the use of modern floating caisson for construction saves investment in civil works; the use of stainless steel making units uses vinyl resin paints The use of cathodic protection can overcome the corrosion of seawater and the adhesion of sea creatures.
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