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Method and device for complete protection against direct lightning strikes in small wind farms
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A technology for wind farms and direct lightning strikes, which is applied in the field of complete protection against direct lightning strikes, and can solve problems such as transient potential elevation, secondary lightning strikes, and disasters to the power network.
Inactive Publication Date: 2016-06-22
周志强 +1
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Facts have proved that the mechanism of lightning strikes is very complicated. Once the lightning current enters the fuselage, it will not flow according to people's subjective intentions, but can flow freely through multiple channels from the top of the tower to the bottom of the tower. The rise of transient potential, electromagnetic induction and lightning counterattack will pose a great threat to the electromechanical equipment and electronic devices of the unit and even personal safety
Not only that, through the fuselage electrical, electronic equipment and lines, direct lightning waves will also be converted into lightning intrusion waves entering the ground substation equipment and control devices, resulting in secondary lightning strikes, which may harm the entire power network
[0005] In addition, the wind turbines standing abruptly in the open field act as lightning rods when the wind, rain and lightning are heavy, and the wind farm may become a lightning field at this time. , it is also very easy to be "broken" by the thunder and lightning of God, and it is impossible to guarantee the safety of equipment and personal safety of the entire wind farm in thunder and lightning disaster weather
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example 1
[0106] [Example 1] Now with figure 2Take the small wind farm with the units arranged in opposite rows as an example to illustrate how to implement complete shielding protection against direct lightning strikes.
[0107] It is known that the wind farm is arranged in opposite rows, and there are 16 10KW, FD7-10K wind turbines installed with a spacing of 5d. The design, calculation and determination of the direct lightning shielding protection scheme are as follows:
[0108] 1. Determine the limit height H of the protected unit
[0109] H=h 1 +d / 2=12+7 / 2=15.5≈16(m)
[0110] Where: h 1 -Wind turbine tower height, check FD7-10K product catalog, h 1 =12m;
[0111] d-the diameter of the wind wheel, found in the product sample, d=7m,
[0112] 2. Determine the protection radius r of the H horizontal plane H
[0113] Assuming a square unit, figure 2 Units 1#, 2#, 5# and 6# are divided into unit squares,
[0114] r H = ...
example 2
[0163] [Example 2] There is a small hydropower station in front of the river beach, and a small wind farm has been built, with a total of 10 3000W, FD7-3000 wind turbines, such as Figure 9 Arrangement, now calculate and determine the complete protection scheme of direct lightning strike.
[0164] Due to the relatively small power of each small wind farm unit and its location in a river valley beach, the relatively mature and reliable broken line method is still used for calculation and drawing.
[0165] 1. Calculation of the total height H of the unit
[0166] H=h 1 +d / 2=8+7 / 2=11.5(m)
[0167] For the convenience of calculation, the value of H is 12m.
[0168] In the formula: check the product sample h 1 and d are 8 and 7(m) respectively;
[0169] 2. Obtain the plane protection diameter r at the unit height (12m) H
[0170] According to the method of combining the above-mentioned unit square and broken line calculation and drawing, the unit of this example is 4n+2=10, ...
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Abstract
The invention provides a method and a device for fully protecting a small wind farm from a direct lightning stroke. For current situations of high lightning probability and low lightning-preventing capacity of a small wind-power generating device with increasingly wide application, the traditional lightning rod device is used for serving a modern lightning-preventing concept of rejecting lightning outside a machine body; in particular, by a method of combining calculation and mapping and by using a unit square concept, the number of the set lightning rods is calculated; considering an equivalent lightning area generated by a lightning triggering effect of the wind farm, a correction factor is introduced, the heights of the lightning rods are increased, ratios of the distance between the lightning rods to the heights of the lightning rods are correctly adjusted, a lightning rod needle body with a combined structure which is formed through sectional connection of welded steel tubes is arranged, and finally, a three-dimensional multiple direct lightning stroke protection system, which takes a machine set of the wind farm as a protection core, completely shields the equivalent lightning ground of the wind farm, and takes a combined protection range including a 'mother and child seat', a 'double-child seat' and a 'three-star seat' and the like as a safety passage, is formed.
Description
technical field [0001] The present invention relates to direct lightning strike protection for outdoor renewable energy devices, in particular to a method and device for complete protection against direct lightning strikes for small-scale wind farms in mountainous valleys and their wind power generators. Background technique [0002] As towering and protruding power-generating objects on the ground, wind turbines are exposed to the atmospheric environment day and night, and it is "common" to suffer direct lightning strikes on the open field, and some have a relative lightning strike probability as high as 300%. When struck by lightning, the huge energy released by the discharge lightning current will cause serious damage to the blades of the wind turbine, the transmission device, the power generation and transformation equipment, the converter device, the electronic equipment and the calculation and control system, and pose a threat to the life of those who are close to the w...
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Application Information
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