Novel tidal power developing mode and universal condition tidal power plant

[0021] An example is as follows: the site area is selected in the Sanmen Bay area along the southeast coast of Zhejiang Province. The -10m contour line of the bay and shallow sea covers an area of ​​more than 3,100 square kilometers, of which the Sanmen Bay area is 775 square kilometers, of which the tidal flat area is 295 square kilometers. km, and the average water depth in the sea area is less than 10 meters.

[0022] Tide characteristic parameters: the tide ebb and flow in this sea area lasted 12 hours and 25 minutes, of which, the high tide was 5 hours and 51 minutes, the low tide was 6 hours and 34 minutes, the maximum tidal range was 7.75 meters, and the average tidal range was 4.25 meters; the average tide level rising speed was 0.73m per hour , the average ebb speed of the tide level is 0.65 meters per hour, and the effective design tidal range in the planning stage is 4.0 meters. Power generation characteristic index: In order to simplify the analysis and calculation of complex tidal power generation characteristic index, the method of equal water area comparison is adopted. In this analysis and calculation, the set sea area is 210 square kilometers, and the designed absolute tidal range is 4.0m.

[0023] The design of the original single-storage conventional tidal power station: the single-storage area is 210 square kilometers, the maximum water level is 4.0 meters, the minimum water level is adjusted accordingly to the storage capacity of 525 million cubic meters, and the minimum water head for power generation is 1.5m. The installed capacity is 400,000 kw, the power generation water per hour is 120 million cubic meters, the water level decline rate of the reservoir is 0.571; The power generation capacity is 1.64 million kWh, and the annual power generation utilization hours are 2993 hours.

[0024] The design of the AB library tidal power station of the present invention: the total area of ​​the AB library is 210 square kilometers, of which the set area of ​​the A library is 110 square kilometers, and the area of ​​the B library is 100 square kilometers; the comprehensive installed capacity is 200,000 kw. After adjustment and calculation, the highest water level in Reservoir A is 4.0m and the lowest water level is 2.02m; the lowest water level in Reservoir B is 0.0m and the highest water level is 2.0m. The tide level outside the reservoir rose to 1.7m, the water level of reservoir B was 0.0m, and power generation began. When the tide rises to 4.0m, the generating time of the unit is 3.35 hours. At the beginning of low tide, the unit continued to generate electricity for 1.0 hours, so that the water level of Reservoir A dropped to 3.53m, and the water level of Reservoir B rose to 2.00m and stopped power generation; when the tide level outside the reservoir retreated to 2.00m, the required low tide time was 2.68 hours, and the downtime of the power station was 1.68 hours; From 2.0m to 0.0m, there are still 3.28 hours; the actual generating time of the unit during the low tide is 4.28 hours; the total power generation time of the whole tide is 7.63 hours, the power generation capacity per tide is 1.526 million kw, and the annual power generation utilization is 5570 hours.

[0025]From the comparison of the above embodiments, it can be seen that the AB library tidal power station has the following relative advantages: First, it can greatly reduce the cost per unit of electricity. The installed capacity of the AB library tidal power station is 50% of the installed capacity of the traditional single library tidal power station. The installed capacity utilization hours can be increased by 86.1%, the effective utilization rate of tide energy resources can be reduced by 7%; the investment in mechanical and electrical equipment can be reduced by 100%. Since the electromechanical investment in China's tidal power stations is generally greater than the civil construction investment, the unit electric energy of conventional tidal power stations remains high. For the tidal power stations in A and B, the electromechanical investment can be reduced by 50%, so that the unit electric energy investment index can be better than that of the conventional tidal power station built. Second, the comprehensive utilization of resources in the reservoir area is better than that of conventional single-reservoir tidal power stations. At present, the development of tidal power station attaches great importance to the development and utilization of aquaculture and tourism resources in the reservoir area to improve comprehensive benefits. In addition to the above comprehensive development and utilization of the AB reservoir tidal power station, the maximum water level of the B reservoir is 2.0m lower than the highest astronomical tide, that is, 2.0m lower than the highest water level of the traditional tidal power station reservoir. The tidal flats with a height difference of 2.0m along the bay in the B reservoir area are exposed to the water surface and become agro-ecologically developable land. This valuable land resource will completely change the production conditions and living environment of the B reservoir residents, and its social benefits are huge. The third is to change the traditional concept of poor power quality of tidal power stations. Because the AB reservoir tidal power station has good adjustability, the total installed capacity of the same reservoir can be determined according to the power load requirements of the power grid. The larger the installed capacity, the stronger the peak capacity. , so that the AB library tidal power station also has the function of grid peak regulation.