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Advantages of high voltage power

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Advantages of high voltage power

作者: Release Date: 2018-07-21 Author: Click:

1. Improve the guaranteed delivery capacity.

The natural power of a 1000kV UHV transmission line is close to 5 million kilowatts, which is about five times that of a 500kV transmission line. Only ± 800kV DC UHV transmission can reach 6.4 million kilowatts, which is 2.1 times that of ± 500kV HVDC and 1.7 times that of ± 620kV HVDC.

2. Progressive fluctuation limit.

The electrical interval of a 1000 kV line is equivalent to 1/4 to 1/5 of a 500 kV line of the same length. In other words, under the condition of guaranteed transmission of the opposite power, the extremely long transmission interval of a 1000kV UHV transmission line is about four times that of a 500kV line. Adopting ± 800kV DC transmission technology enables ultra-long-distance transmission, and the economic transmission interval can reach 2500km and above.

3. Reduce line loss.

In the case where the total cross section of the conductor and the guaranteed delivery capacity are opposite, that is, the values of R and S are equal, the resistance loss of the 1000kV AC line is a quarter of that of the 500kV AC line. The resistance loss of the ± 800kV DC line is 39% of the ± 500kV DC line and 60% of the ± 620kV DC line.

4. Increase project investment.

The overall unit cost of the 1000kV AC transmission scheme is about three-quarters of the 500kV transmission scheme. The unit cost of the guaranteed transmission capacity of the ± 800kV DC transmission scheme is also about three-quarters of the ± 500kV DC transmission scheme.

5. Save corridor area.

AC UHV: The width of the corridors of the double-circuit lines on the same tower and the single-circuit lines of Maotou Tower can be identified as 75 meters and 81 meters. Three times.

DC UHV: The line corridor of the ± 800kV, 6.4 million kilowatt DC transmission scheme is about 76 meters, and the guaranteed capacity of the unit corridor width is 84,000 kilowatts / meter, which is 1.29 times that of the ± 500kV and 3 million kilowatt schemes. 1.37 times the plan.

6. Improve power grid structure.

The completion of long interval power transmission through UHV can increase the demand for installing units in the intestine area of the load center, thereby reducing the short-circuit current amplitude. Long interval output of 10 million kilowatts of electricity is equivalent to the addition of 17 600,000 kilowatt units installed locally. Each 600,000-kilowatt generating unit adds approximately 1.8 kA to its 500 kV fragmentary short-circuit current in the immediate vicinity. If these units are installed in the intestine area of the load center, the degree of short-circuit current to the external power grid will be greatly affected.

After the UHV power grid, the layered and partitioned layout is completed, which can optimize the fragmented structure including the ultra-high voltage, and basically handle the short-circuit current exceeding the standard performance.

URL of this article: http://pdaavenue.com/足球彩票/356.html

Keywords: overhead line

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