Throughout the development history of China's power transmission network, the initial power transmission technology from low voltage to high voltage, China has been running behind the Western countries, and even to the ultra-high voltage technology, China has lagged behind the West by a full 20 years, facing heavy difficulties and pressures , Through independent research and development, China has finally moved from being backward in technology to leading the world in the field of UHV technology. Even Europe and the United States must obey the standards set by China. How good is China's UHV technology?

How powerful is China's UHV technology?

The reason why China attaches great importance to the research and development of UHV technology is mainly because it faces severe electricity consumption problems. From 2000 to 2019, China's social electricity consumption has nearly tripled, and it is expected to reach 11 trillion by 2030. However, from the perspective of geographical structure, China's western region is rich in energy resources. More than 80% of the country's oil, wind power, hydropower and other energy sources are distributed here, and the electricity here is too much to be used up.

However, the eastern coastal and central regions are faced with the problems of high population density, large power consumption, and insufficient energy and power supply. Therefore, the original power transmission technology can no longer meet our current electricity demand. At this time, large-capacity, long-distance, low-loss UHV technology has become the goal we have been pursuing and developing. What is UHV technology?

What is UHV technology?

In China, voltage is divided into five categories: low voltage, medium voltage, high voltage, ultra-high voltage and ultra-high voltage, and ultra-high voltage technology is a transmission project that transmits more than 1,000 kV. When using ultra-high voltage technology to transmit power, power plants first use transformers Raise the power to over 1000 kV, wait until the electrical ground and then step it down to 220 volts and 380 volts for users to use.

Compared with UHV technology, UHV technology can triple the farthest power transmission distance while delivering the same power, saving 60% of land resources, and the loss is only 25-40% of that of 500kV EHV lines. %. Since 2004, State Grid has organized dozens of colleges and universities and scientific research institutions, as well as hundreds of thousands of people from equipment manufacturing enterprises, to participate in basic research and commissioning of UHV technology.

Under the condition that there is no experience to learn from at home and abroad, it took four years to cross the river by feeling the stones. In 2009, the construction started from the Jindongnan Substation in Shanxi, crossed the Yellow River, passed the Nanyang Switch Station in Henan, and ended at The UHV transmission project of Jingmen Substation in Hubei has a total length of 654 kilometers and a maximum operating voltage of 1100 kV. This is also the world's first 1000 kV transmission line.

Since then, China's power grid has entered the UHV era and has begun to lead the construction of UHV power grids in the world. Of course, the development of ultra-high voltage technology is inseparable from the strong support of national policies. In our 14th Five-Year Plan, the state's investment in the first stage of ultra-high voltage is as high as 196.6 billion. With sufficient financial support, the development of ultra-high voltage technology Perfection is a matter of time.

By the end of 2020, China has built a total of 35 UHV projects, and the total length of UHV lines under construction is 48,000 kilometers. Now, the global UHV power transmission and transformation technical standards are written in Chinese, because in this field, the Chinese standard is world standard.