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2022-09-27
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Scientific and technological innovation helps realize "benefit wind power"

editor's note: wind turbines are the "heart" of wind power generation systems. In the traditional horizontal axis wind power generation, the blades of the wind wheel need to look for the wind direction to generate power, and the wind is small and cannot generate power, and the wind is large and cannot exceed the limit. The new vertical axis generator can generate power in any wind direction, and "small wind generates small power, large wind generates large power"

on July 15, the world's first megawatt level vertical axis wind turbine (semi direct drive wind power special switched reluctance generator) went offline in Pinghu, Longgang, Shenzhen. This 24 ton large generator weighs only half as much as similar generators, and its cost has been reduced by 40%, but its power generation efficiency has been greatly improved. It not only fills the gap in the field of large-scale switched reluctance generators for wind power generation in the world, establishes China's leading position in vertical axis technology in the world, but also will vigorously promote China's transformation from "subsidized wind power" to "benefit wind power"

the technical indicators exceed those of similar foreign wind turbines

wind turbines are the "heart" of wind power generation systems. In the traditional horizontal axis wind power generation, the blades of the wind wheel need to look for the wind direction to generate power, and the wind is small and cannot generate power, and the wind is large and cannot exceed the limit. The new vertical axis generator pioneered by Shenzhen wind power technology company can generate power in any wind direction, and "small wind generates small power, large wind generates large power"

according to Shenzhen wind power technology company, this new generator will first be applied to sf500k vertical axis wind turbine of wind power technology, providing a revolutionary "heart" for the unit. Its acceptable and output power range is between 10 kW and 1000 kW (i.e. 1 MW), the efficiency reaches more than 90% in the whole power range, and the input speed is only 20 to 200 rpm. At the same time, because the unit type is vertical shaft, the generator and other main equipment are installed in the machine room on the ground, and the cost of installation, operation and maintenance is greatly reduced. The vertical axis unit does not need to face the wind, and can adapt to different wind conditions with frequent changes in wind direction. The application space is very broad

experts believe that as a megawatt unit, achieving such low speed and such high efficiency is also a major breakthrough in the wind power industry. According to the recent test run and technical verification data, this new generator not only provides a set of new and efficient core components for the wind power generation system, but also has fully independent intellectual property rights, including 24 patents. In addition, the technical performance indicators and economic benefit indicators are far more than the existing similar wind turbines at home and abroad, and the time used for wind power generation can reach more than 1.5 times the national standard

according to the introduction, "switched reluctance motor" (without cutting the magnetic line of force) has always been the core technology and difficult problem in the field of wind power generation equipment in the world. At present, the power of such motors in the world is only a few thousand watts to ten thousand watts, and the power range is small. In terms of technology application, it is still in the exploration and initial stage. In the "863 Plan" and "973 Plan", China has included this major key technology in the list of key support projects under the names of "switched reluctance motor" and "doubly salient machine motor" respectively. However, the two projects have only completed the relevant basic theoretical research and prototype production, and have not made a breakthrough, let alone entered the industrialization stage

help wind power make real money

as we all know, although the cost of wind power has decreased significantly in recent years, it still does not have a cost advantage compared with traditional energy. There are only a few wind power enterprises that really make money in China. Government departments have adopted many supportive and preferential policies for wind power, such as formulating wind power development goals and quota proportions; Provide financial subsidies for electricity price increase, etc. Therefore, wind power is regarded as "subsidized wind power" without economic benefits

Zhou Qingyu, chairman of Shenzhen Fengfa technology company, said that this new generator is based on switched reluctance motor technology. As a high-end technology in the motor industry, switched reluctance motor has the characteristics of working in a wide range of speed and power. It has been used in the field of power before, that is, as a motor. Motor and generator are two sides of the motor. Through exploration, research and test, it is successfully designed as a generator dedicated to wind power, which is combined with vertical axis technology to realize low-speed semi direct drive. In the future, the gearbox will be cancelled to realize full direct drive. The technical breakthrough of vertical axis wind turbine has been realized, the power generation efficiency has been improved, and the cost of poor contact of contact points has been greatly reduced

wind power experts pointed out that this new wind turbine has many major innovations: first, it is efficient and has a wide working range, which is suitable for wind power generation, especially for vertical axis wind power. More than 85% of plastic enterprises have adopted recycling equipment and recycled materials; Second, the generator realizes semi direct drive with high transmission efficiency; Third, output DC, which can reduce the inverter process; Fourth, within the range of 10%-250% rated power, the power generation efficiency can be improved by more than 92%

in terms of stability and durability, the current national basic requirements for wind power projects are that the annual power generation time must reach 2000 hours, and the annual power generation time of this new type of fan can exceed 3000 hours, which can directly reduce the market cost per kilowatt hour. Therefore, it needs to be considered comprehensively in combination with formula design, processing technology, post-treatment technology, etc. the cast iron test piece finally shows a slight failure. In the industry's view, the significance of this new fan technology lies not only in the number of patents it has, but also in its significant reduction of the overall cost, construction cost and maintenance cost, which is conducive to the real realization of "benefit wind power"

Zhou Qingyu said that the fan will be officially SOLD next month. If vigorously promoted, it is expected to directly reduce the market cost per kilowatt hour, reaching no more than 0.3 yuan per kilowatt hour. It is revealed that they have obtained orders for wind farms and are expected to deliver 40 sets this year

related knowledge link

direct drive wind turbine: it is a generator directly driven by wind, also known as gearless wind turbine. This generator adopts the way of direct connection between multipole motor and impeller to drive, eliminating the traditional component of gearbox. Because the gearbox is a component with high overload and premature failure rate in the MW wind turbine at present, the direct drive wind turbine without gearbox has many advantages, such as high efficiency, low noise, high service life, reduced unit volume, reduced operation and maintenance costs at low wind speed

semi direct drive wind turbine: it refers to that the wind blade drives the gearbox to drive the permanent magnet motor to generate power. It is between direct drive and doubly fed. The speed regulation of the gearbox is not as high as that of doubly fed, and the generator has also changed from the looping type of doubly fed to the permanent magnet synchronous type

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