With the continuous introduction of decentralized wind power related policies in the country, people have placed great expectations on the development of decentralized wind power. Mr. Qin Haiyan, secretary general of the Wind Energy Professional Committee of the Chinese Renewable Energy Society, said that the next field of hope for wind power in China is decentralized wind power. However, as of the end of 2017, the proportion of decentralized installed capacity in China is less than 1%, which not only reveals the dilemma of development, but also indicates the potential for development.
The principle of decentralized wind power development is 'in accordance with local conditions and accessibility', and the direction the country is requesting for development is mainly in the low wind speed regions in the south of the Middle East. Its significance lies in the load center, and it can be locally incorporated into the network. The existing horizontal axis fans are available. In order to achieve low wind speed, two methods of increasing the length of the blade and increasing the height of the tower are commonly used, which will increase the manufacturing cost of the fan, and the noise generated by the horizontal axis fan and the safety problem in the area close to the living environment, As well as the maintenance of dispersed unit equipment, it will increase the difficulty of the work. If the team is not professional, it will not be able to achieve maintenance. This will bring technical and practical obstacles to the development of decentralized wind power.
Wind turbines are divided into: Horizontal-axis wind turbines and vertical-axis wind turbines. Vertical-axis turbines are more suitable for decentralized wind power generation. Vertical-axis fans have a simple structure, no wind direction requirements, easy installation and maintenance, and no noise. Experts and scholars in the industry are hailed as the future direction of wind turbine development. However, vertical axis wind turbines with models above 10 kilowatts have not been widely used. The main reason is that vertical axis wind turbines have not been solved due to their technical difficulties, such as start-up, control, and vibration. The problem of efficiency and efficiency has been called the four major technical problems that have plagued the development of vertical axis fans, affecting the development of vertical axis fans.
Today, Heilongjiang Ande New Energy Technology Development Co., Ltd. is the only company in the world that has successfully solved the world's four major technical problems and has independent intellectual property rights. After fifteen years of research and development by scientific and technical personnel, after six generations of prototype testing, three years of safe operation. , Make the vertical axis fan from the efficiency, structure, safety tends to be perfect, so that the vertical axis fan has a high power generation efficiency, light and simple structure, basically no noise, basic maintenance-free, low input cost of a new generation of full wind full wind speed Vertical axis wind turbines. Its main models range from 10 kilowatts to 1000 kilowatts, and can be designed and manufactured according to customer requirements. Especially suitable for decentralized, distributed wind power applications.
The decentralized wind power projects are diversified, and individual requirements for unit adaptability have been put forward. Existing horizontal shaft machine manufacturers have insufficient market research, especially for customized fans and miniaturized fans, and they have no decentralized The development of wind power plays a leading role. The fan equipment and solutions for centralized wind power can not be copied into decentralized wind power projects. The performance of vertical axis fans has unique advantages in decentralized wind power.
1, According to the evaluation results of the National Meteorological Administration, the wind energy resources with economic development value of over 5m/s in the southern Middle East have reached 1 billion KW, and the development space is huge. The vertical axis wind speed is 3m/s. In this case, the power generation can be started. Because the vertical axis fan has no wind direction requirement, the horizontal axis fan manufacturer's prediction of wind loss from 5%-10% of the wind is an additional increase. The vertical axis has not cut out the concept of wind speed, and is not under strong wind conditions. It can continue to generate electricity when it affects the safety of the fan. This is not possible with other existing fan manufacturers. Therefore, the vertical axis fan has higher power generation efficiency in decentralized wind power.
2. In the future, decentralized wind power development in the southern part of the Middle East will adopt more methods for renting idle construction sites in industrial parks, development zones, and large-scale industrial enterprises, especially distributed wind power projects with 'self-occupancy, surplus power access' and direct lease. Users own or close to the construction site, which puts higher requirements on the safety, installation distance and noise of the wind turbine. The horizontal axis fan installation distance requires a design specification of 500 meters, which has certain limitations in space. Horizontal axis fan The blade tip speed is 80 m/s, and the strong wind noise impact on the surrounding environment has to be considered. The vertical axis fan is downwind and its tip speed is 40 m/s. The installation distance is not too large. Far-end requirements, basically no more than ambient noise, can also be installed in close proximity to the living area. Therefore, the vertical axis fan with no impact on the environment is more suitable for decentralized wind power applications.
3. Centralized wind power projects are remote and far away from densely populated areas. Even if extreme accidents such as tower collapse, fire, and blade falling occur, they will not cause any other losses. However, water shaft fans are used in decentralized wind power applications. With tower towers and long paddle technology, it is close to the production and living areas. Once such accidents happen, they can easily cause major additional losses or even personal injuries outside of the wind farm. As a result, it will inevitably lead to local governments and the public. Fear and contradictions have caused a fatal blow to decentralized wind power development. For this reason, wind turbines used in decentralized scenarios should meet higher safety standards, apply more updated sensing technologies, and have more safety detection and protection capabilities. The vertical axis fan is more suitable for installation in the area close to the living environment because of its light and simple structure, safer operation speed, and lower failure rate.
4. For operation and maintenance, taking a typical 50,000 KW centralized wind power project as an example, an operation and maintenance team of about 10 people is needed. The annual operation and maintenance expenditure is about 3 million - 5 million yuan. About 60 -100 yuan / kilowatt year. Vertical axis fan structure is light and simple without complex pitch, yaw system, no gear box, basically maintenance-free. In the mode of using remote supervision and management, only need regular maintenance every year, The regional maintenance center established by the manufacturer can be easily solved. Therefore, the vertical axis fan is more suitable for the operation and maintenance of wind turbine equipment.
5. In principle, decentralized wind power will not build dedicated booster station facilities, which can save about 300,000 yuan per MW capacity. It can also save wind measurement costs and road costs. Take Huaneng Group's Dingbian Co., Ltd. as an example. Compared with the local centralized wind farm, the unit kilowatt cost savings exceed 200 yuan. The use of vertical exhaust fan, because of its simple structure, small parts, there is no horizontal shaft fan pitch and yaw system in the overall price of the fan The cost, because of its overall light weight, can also save the cost of infrastructure and hoisting, and the cost advantage is significant. Therefore, the use of vertical axis fans to develop decentralized wind power projects can quickly recover the investment.
In today's world, rising energy demand and the strengthening of environmental protection, the promotion and application of clean energy have become an inevitable trend. Clean energy is becoming a completely commercialization and does not require subsidies for energy, as the main force of clean energy wind power , will certainly make greater contributions to environmental development.
