UHV Interprovincial Sends "Green Power" to Ease Contradictions between Energy Supply and Demand

“Two Tianjin UHV power transmission channels will save 9 million tons of coal annually, reduce carbon emissions in the region by 17.5 million tons, sulfur dioxide by 44,000 tons, and nitrogen oxides by 46,000 tons,” said Tianjin Industry and Information Technology Commission. Liang Tao, a researcher at the Power Department, said in an interview with a reporter from the First Finance Bureau.

Liang Tao said that the two UHV power transmission channels are Ximeng-Shandong and Mengxi-Tianjin South UHV AC external transmission channels. After the two UHV AC projects landed in Tianjin, Tianjin Power Grid became the hub of the North China Power Grid's transmission of power from west to east and North Power and South to the south. It transformed from an important part of the power grid of Beijing-Tianjin-Tangshan Power Station to the transfer of tidal currents. The key channel, Tianjin Power Grid formally entered the "Ultra High Voltage era."

At present, China has completed the construction of the “Four Matches and Four Straights” UHV project, including four UHV AC projects in Huainan-Nanjing-Shanghai, Ximeng-Shandong, Mengxi-Tianjin South, Yiheng-Weifang, and Ningdong-Zhejiang. , Jinbei - Jiangsu, Ximeng - Taizhou, Shanghai Temple - Shandong 4 UHV DC project. Together with the Jiuquan-Hunan, Zhaut-Qingzhou UHV DC project to solve the problem of clean energy delivery in Gansu Province and the Northeast “electricity power supply” problem, the 10 UHV projects have a total investment of 220 billion yuan, passing through 16 provinces (cities). , autonomous regions), to build 16,000 km of UHV lines, and add commutation (substation) capacity of 174 million kVA.

To win the strong support of the blue sky to defend the battle

Since the beginning of winter, haze days have been rapidly reduced at a speed that is visible to the naked eye.

On December 21, 2017, the data released by the Ministry of Environmental Protection gave corroboration: In November, the average number of days of good days for 338 prefecture-level cities and above was 79.2%, an increase of 6.3 percentage points year-on-year. The PM2.5 concentration was 51 micrograms/cubic meter, a decrease of 10.5% from the same period last year. From January to November, PM2.5 concentration was 41 μg/m3, which was 4.7% lower than the same period of last year; PM10 concentration was 73 μg/m3, which was 2.7% lower than the same period of last year.

Among them, the air quality in the Beijing-Tianjin-Hebei region was significantly improved. The average number of excellent days in 13 cities in November was 68.5%, a year-on-year increase of 31.6 percentage points. PM2.5 concentration was 60 micrograms/cubic meter, a decrease of 41.2% over the same period of last year.

In September 2013, the State Council promulgated the "Action Plan for Prevention and Control of Atmospheric Pollution," proposing to accelerate the adjustment of energy structure, and to eliminate and replace traditional inefficient and heavy-pollution energy-using methods in an all-round way. It plans to reduce severely polluted weather by 5 years. It is required to replace coal-fired coal by gradually increasing the proportion of accepting external transmissions to achieve a negative growth in total coal-fired consumption.

In May 2014, 12 key transmission lines, including the “Six Cross and Four Straight” UHV projects, were incorporated into the National Air Pollution Prevention Action Plan. These 12 transmission corridors connect the Beijing-Tianjin-Hebei-Luzhou-Yangtze River Delta, the Pearl River Delta region, and the northern, western and southwestern energy bases to form a blueprint for clean energy transmission from north to south and from west to east. This blueprint can help reduce the annual production of 200 million tons of coal for power generation in the eastern and central regions and reduce the concentration of PM2.5 by 4%-5%.

According to the data provided by the State Grid Corporation of China, after 10 UHV projects are fully completed and put into operation, they will increase 80 million kilowatts of power capacity in the eastern and central regions, reduce annual coal transportation by 180 million tons, and reduce PM2.5 concentrations by 4%-5. %, effectively meet the electricity demand of the Beijing-Tianjin-Hebei-Lujiang-Yangtze River Delta, and promote the realization of energy-saving emission reduction and air pollution control targets.

Liang Tao told First Financial that these “green powers” ​​from the air not only reduced transportation costs, but also effectively avoided dust pollution in the transportation and storage sectors.

Adjusting the reliability of the power supply structure

These above-mentioned major transmission arteries that pass through the eastern and western parts of China are led by the development and utilization of clean energy in the west, and are accompanied by haze control in the eastern and central regions.

For a long time, China's energy resources and productivity have been adversely distributed, and there is a situation of “having a lot of trouble”: One is that the large resource-rich provinces in the central and western regions can't send electricity; the other is that the large economic provinces in the east have no electricity available. Mengxi is rich in energy resources such as coal and wind energy, and it is one of the nine large-scale wind power bases identified by the country. However, local capacity for wind power consumption is insufficient, and it is urgently necessary to expand the scope of consumption. The UHV power grid project has a large transmission capacity and a long transmission distance, making it possible for large-range and long-distance transmission.

The UHV project has played a positive role in the transformation and upgrading of the power supply structure and the energy industry structure.

Taking the Mengxi-Tianjin South special high-pressure project as an example, the output of Inner Mongolia’s coal has always been ranked first in the country, and wind energy and light energy are also rich in reserves. The total wind energy reserves account for 50% of the country’s total and ranks first in the country. The increase in production capacity and the lack of usage have increasingly become the bottleneck in the development of the energy industry in Inner Mongolia.

The relevant person in charge of State Grid's Mengdong company expressed to First Finance that the construction of the UHV project will effectively promote the intensive development of energy bases in Inner Mongolia, advance the joint delivery of thermal power and wind power, increase the efficiency of resource utilization, and expand the range of new energy consumption such as wind power. Promote the transformation of local resource advantages into economic advantages. After the production of the “Sanjiao Sanzhi” UHV project in Inner Mongolia was put into operation, it was able to add about 44 million kilowatts of outbound power capacity in Inner Mongolia and increase the outbound capacity in Inner Mongolia to 70 million kilowatts, which was nearly 2.7 times higher.

At the same time, this UHV channel has effectively relieved the excessive coal-fired capacity in the receiving end of Tianjin and prevented the risk of shortage of district heating and power supply caused by shortage of gas supply.

Liang Tao told reporters that the UHV line has met the demand for energy supply from the rapid socio-economic development in Tianjin, and it has been able to add 5 million kilowatts of external power capacity to Tianjin. Under the support of ground-level electricity in the UHV power grid, in 2017, Tianjin Municipality completed the stoppage and repatriation of coal-fired small units with a total capacity of 862 megawatts at the Junliang Power Plant and Jinghai Thermal Power Plant, effectively reducing the total emissions of local coal-fired power plants in Tianjin. During the winter shortage of gas supply, the UHV power grid uses electricity to replace gas transmission and coal transportation, and adjust long-distance gas and coal transportation methods to long-distance, high-efficiency electric energy transportation methods. The UHV will also lay the foundation for future large-scale coal-to-electricity reform. If gas is insufficient, UHV can guarantee energy security.