What is UHV Power Transmission Technology?

In the field of science and technology, Europe, America and Japan have always been at the forefront. However, there is a technology that is unique to China. At present, only us in the world can do it. This is UHV transmission technology. So what is its role? Why does our country have to develop it? What is the difficulty of this technology? Even the United States and the Soviet Union have no solution.



What is UHV power transmission technology?

As we all know, the transmission of electricity relies on wires. Whether it is our household electricity or business electricity, it needs to be transmitted through the grid.

Where does the electricity in the grid come from? Naturally, it is sent by various power plants, but ordinary grid transmission relies on high-voltage transmission. This method has limited transmission distance and small transmission capacity.

The UHV transmission technology just makes up for its shortcomings. Not only is the transmission capacity large, but the transmission distance is long, the line loss is relatively low, and the occupied land area is small. It is currently the world's most advanced power transmission technology.

What are the differences between UHV, high pressure and UHV?

In fact, in addition to high pressure and UHV, there is also a kind of UHV, so what is the difference between these three? First of all, we are clear that the voltage must be different.

Under normal circumstances, power supplies with a voltage of 250 volts and above, and power supplies with a voltage of 3000 to 11000 volts in industry, we all call them high-voltage power.

UHV is considered to have a pressure exceeding 100 MPa, while UHV refers to the voltage level of 800 kV and above DC and 1000 kV and above AC.

Secondly, they are applied in different fields. High voltage is the transmission and distribution lines in the power system, such as high-voltage towers, substations, or centralized electricity consumption.

Ultra-high pressure is used in food processing and sterilization, and it will not damage the nutrients of food like high temperature sterilization.

The UHV DC transmission is mainly used for ultra-long-distance and ultra-large-capacity transmission in my country's southwestern large hydropower base and northwest coal power base.

Why does my country have to develop UHV transmission technology?

However, before our country, both the former Soviet Union and the United States have conducted research and development on UHV technology, and the results have not been successful without exception. Why should our country insist on research and development when everyone gives up?

In fact, it is also forced by helplessness. China is a country with a vast territory, but energy is not considered abundant. Therefore, it takes care of the development of clean energy such as solar, wind, and hydropower. However, these resources are still unevenly distributed. In order to meet the needs of developed regions Electricity demand must be transmitted from west to east, and UHV technology is the key to this.

So, why does UHV transmission technology use direct current?

However, we found that in the past, we used alternating current for high-voltage transmission, while UHV transmission technology was direct current. Do you know why?

The knowledge from the student days tells us that the current and voltage in DC power are relatively stable, and the size and direction are not easy to change. It is precisely because of this characteristic that DC UHV transmission can achieve high transmission capacity and high voltage. .

To transmit the same power of electricity, DC UHV transmission only needs 1 or 2 wires, while AC power must be 3 wires, and the loss of DC power is small.

*Post-personal opinion:

It is understood that my country has built a total of 26 UHV engineering lines of “12 ACs and 14 Straights”, covering 7 major regional power grids in my country.

There is no doubt that my country's UHV power transmission technology has been far ahead in the international field, and my country's UHV standard has also become the universal standard in this field in the world.

In general, the development of UHV transmission technology is very beneficial to the development of my country, and it can fully connect the Chinese power grid, so that power stations across the country can support and supplement each other, and ensure the growing power demand in the central and eastern regions. At the same time, it can also promote the social development of the resource-intensive and economically lacking western region.