How to make the wind power industry develop furthe

2022-09-21
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How to further develop the wind power industry

the bosses of the three major power groups talk about wind power and believe that only with the further development of wind turbine technology, wind power will have a higher level of development. How to make wind power technology further is an urgent problem to be solved at present, otherwise it will affect the development of China's wind power industry

Michael Adechi, vice president of General Electric Company (GE), said that the existing wind energy technology will be eliminated in three years, and Ge will show a stronger advantage in the next generation of wind energy technology. China's wind power technology faces two choices: one is to wait for others to eliminate us, then introduce technology, and start all over again! Another option is to stand on the shoulders of giants and gain a late mover advantage

the elimination of each technology does not lie in how advanced the subsequent technology is, but in the imperfection of the technology itself. What we need to do is to understand imperfections, research imperfections, and solve imperfections. Replace imperfect technology with perfect wind power technology, and find a breakthrough when you find perfect technology

China's wind power industry needs subsidies and support. How can it stand? How can I run

the installed capacity of wind power in China has ranked fourth in the world. The installed capacity is large, while the power generation is low, the failure rate is high, and it is difficult. How to improve the power generation? How to improve and stabilize

there are nearly 80 wind power production enterprises in China, and the wind power industry in China has just started. The share of wind power in the national electricity consumption is very small. Why is there serious overcapacity

wind power generation appeared at the end of the 19th century. The Danes first developed wind power generators. Since the 1980s, this technology has developed rapidly, and wind power generation, a green energy, has attracted more and more attention. All countries in the world have issued various policies to vigorously support the wind power industry. In recent years, China's wind power industry has developed rapidly, and several large land-based wind farms have been built, ranking fourth in the world in terms of installed capacity. The scale of development is remarkable, but the problems existing in the development are becoming more and more prominent. First, the installed capacity is large, but the power generation is still very low, and the effective power generation time is short, which can not form an effective supplement to power, nor can it form a stable output of power; Secondly, the stability of wind turbines is not guaranteed, especially the large-scale wind turbines, which will cause serious impact and damage to electricity, and will inevitably cause difficulties; There is also a high failure rate, high maintenance costs, and the safety of wind turbines is not guaranteed. These problems are inherent in the existing wind power technology. Why are these problems not obvious in European and American countries, but particularly prominent in China. This is mainly due to differences in the following two aspects

the main reason is the climate difference. Europe and the United States belong to the marine climate with frequent monsoons, so wind energy resources are very abundant. With high wind speed and long windy time, wind power has become an important energy, so wind power in Europe and the United States has developed the fastest. However, Xinjiang, Gansu and Inner Mongolia are all dry plateau areas with low wind speed, short duration of strong wind and low air density. The design wind speed of imported wind turbines is generally 15m/s, and the low wind speed design is also 13m/s. However, the longest and largest wind speed in these regions of China is 6~8m/s. It is obvious that the design value of imported wind turbines is very different from the actual situation of our country. In addition, the difference in air density will inevitably lead to the phenomenon of very low power generation. Wind turbines in Europe and the United States also have the problems of high failure rate and high maintenance cost. However, due to the long annual power generation time and large power generation, this can make up for the losses caused by maintenance costs. In addition, there are few typhoons in Europe and the United States, and there are several major typhoons along the coast of China every year. Typhoons also cause huge losses to China's coastal wind farms. Typhoon Dujuan, No. 13 in 2003, typhoon pearl, No. 1 in 2006, and typhoon Sangmei, No. 8, caused serious damage to the wind turbines of Guangdong Shanwei honghaiwan wind farm, Nan'ao wind farm, and Zhejiang Cangnan hedingshan wind farm, respectively

there are also differences in the way of wind farms. Because the stability of wind turbines is not guaranteed, European and American countries adopt the decentralized way, and the scale of wind farms in these countries is small. When the wind speed and direction change greatly, the wind turbine is unstable and cannot meet the merging conditions. At this time, the wind turbine can be disconnected at any time; After the wind turbine is stable, it can be accessed at any time, and the electricity of several European countries is connected, so the electricity is very strong, which will not cause too much impact on the electricity. In China, large-scale consolidation is adopted, and the regions rich in wind energy resources are mainly distributed in the three North (northwest, northeast and North China) regions and the southeast coast. At present, six ten million kW wind power bases are planned in the three north, but these places are the areas with the weakest electricity, so China's wind power generation will face the problem of electricity overload. At present, the country has begun to plan the construction of smart power, but because these areas are at the end of power, the capacity regulation ability is poor, and it is difficult to withstand the impact of large-scale changes in wind power capacity. We use a data calculation to illustrate this problem. A ten million kilowatt wind farm will have 500~600 wind turbines. We select the data of 2.5MW wind turbine for calculation. The brand of wind turbine is N80 of nordex company in Germany. We take the lower data. When the wind speed is 5m/s, the power is 120kw, and when the wind speed is 6m/s, the power is 248kw. When the wind speed changes to 1m/s, the power change is 128KW. If calculated by 100 typhoon motors, the power change value will reach 12800kw. I don't know how powerful smart electricity is required to bear the impact energy of 10000 kW? And this calculation value is already very small. We calculate it according to low wind speed and small change. The actual wind speed change is much larger, and the change of wind direction has a greater impact on wind turbine power than wind speed. Therefore, the impact energy in actual use is much larger than this value, which will be very amazing, and we must take it seriously. Therefore, solving the problem is not as simple as building a smart power, but requires us to comprehensively improve the performance of wind turbines

from the above analysis, it can be seen that the current wind power technology in Europe and the United States is not suitable for land use in China. The biggest drawback is that the power generation efficiency is too low. There is basically no power generation capacity below level 3 wind, and the design wind speed is 13~15 M/s, that is, it is necessary to reach level 7 wind to achieve full load, which is very rare on land. It is not easy to create a landmark alloy with greatly improved performance when the existing wind turbine generates power annually. Generally, it only takes 2000~3000 hours. Compared with 8760 hours in the whole year, it takes only 1/3 of the time to generate power. Most of the time it becomes a decoration, which seriously affects the utilization of wind power. In addition, the threat of typhoon to coastal wind farms is great. In the past, the scale of wind farms was small and the loss was small; Now the planned wind farms are several times larger than before. If there is typhoon damage, the losses will be huge, and we must take it seriously. And the problem is a big problem related to the success of China's land Three Gorges. The existing wind turbines obviously do not meet the merger requirements. If the performance is not improved, there will be no power generation when the wind is small, and no power generation when the wind is large. The Three Gorges on land will be difficult to operate and the losses will be huge. There is no successful experience to learn from abroad on a large scale. Although wind power accounts for 20-30% in countries such as Denmark, they are all decentralized access, and wind power guidelines have been formulated to strictly regulate the number and capacity of wind turbines at the access point, and to highlight the solution to the bottleneck of market utilization of new materials, and set access and exit standards. Danish national power company receives four weather forecasts from three different weather forecast companies every day, Then use the advanced software system to predict when the wind changes described in the weather forecast will affect the wind turbine, and analyze the impact of these changes on the entire power system for rapid manual intervention. However, there are few cases where the actual mine speed in the wind is completely consistent with the predicted wind speed. This passive and inaccurate control method is certainly not applicable to our country. The impulse current generated by the large-scale wind farms in our country is enough to paralyze the electricity, so it is impossible to have time for manual intervention. Therefore, China has a large scale and higher requirements for the performance of wind turbines. We know that the wind has fluctuations, peaks and troughs. The wind with a long interval is called gust. The change of wind speed will inevitably lead to the change of wind turbine power. We should first solve the impact of wind speed and wind direction changes on wind turbines. The existing wind turbines use the inertia energy of blades to smooth the power. Even if the ABS products are damaged and fluctuated, it works in the case of low wind speed. In the case of high wind speed, the inertia force is better than eggs and stones, which cannot compete with it. The most effective way is to attach an inertial energy storage device separately, and use the inertial energy storage device to cut the peak and fill the valley, which is very helpful to stabilize the power output. In addition, the performance of the blades also needs to be improved. The existing blades will produce strong wind load at high wind speed, which will become unstable and difficult to control, resulting in sharp changes in the power of the wind turbine, which will pose a great threat to the stability of the wind turbine

after nearly 2 or 3 years of rapid development, China's wind power industry has entered a critical period of development. Now we have basically mastered wind power technology, and our experience has been constantly enriched, and problems have emerged. We should now calm down, analyze problems, study problems, solve problems, and find a breakthrough. Low power generation efficiency, stability and safety are not guaranteed and difficult. These problems are fatal to the wind power industry. Only by solving these problems can we make the wind power industry in China develop healthily and rapidly. Next, we will look for the root cause of the problem and the breakthrough to solve the problem from the development process of wind power technology

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