UHV and smart grid construction start: investment will reach 2.5 trillion yuan

In particular, he pointed out that to achieve the green development of energy equipment, the first is to develop efficient and clean coal-fired power generation equipment; the second is to develop advanced transmission technology and equipment, and vigorously develop UHV; third is to develop a smart grid.

This is the first time that senior officials from the Ministry of Industry and Information Technology have made public statements on the development of the smart grid and UHV in public. The industry believes that this is the main direction for the development of the power grid, and it also means that many smart power grids and UHV construction that have been controversial have ushered in a real spring.

What is UHV and Smart Grid?

For the UHV and smart grid, it is the most popular word in the market in the past two years. However, what is specific is that many people do not understand it. So, what is the relationship between UHV and smart grid?

The main feature of the smart grid is that it can connect different levels of power plants to meet the needs of users at different levels. UHV technology is mainly able to connect large capacity to new power plants. UHV lines can solve the congestion problem because of their huge transmission capacity. As a new generation of transmission technologies and networks, the smart grid can solve cross-regional problems.

At present, one aspect of China's power industry is that, on the one hand, coastal and economically developed regions used to have power shortages in the summer, and now the time for power shortages is already ahead of schedule. The reason is that there is no shortage of coal, but new installations are difficult to meet the new electricity demand; on the other hand, In some places, power generation is wasted because it cannot go online. China's energy resources are mainly distributed in the northwest. For example, two-thirds of the coal resources, wind energy, and solar energy are distributed in the north and northwest. Four-fifths of the hydropower resources are distributed in the southwest and two-thirds of the electricity load is concentrated. In the eastern region.

How to reconcile the two contradictions? According to Su Bo, the vice minister of the Ministry of Industry and Information Technology, he developed advanced transmission technology and equipment, especially advanced high-voltage and other high-capacity, high-efficiency advanced transmission technology and equipment, to reduce the large-scale, cross-regional transmission line losses. The development of smart grids can be effectively compatible with intermittent new energy sources such as wind power and solar energy, and can enhance the convergence between the demand side and the supply side, and improve the transmission and distribution efficiency. Only in this way, once the severe wind curtailment phenomenon can be controlled with the UHV smart grid, it is possible to transfer such concentrated and unstable power from the “three norths” to the North China and China Medium Load Centers. Similarly, the future development of nuclear power and hydropower as clean energy will also depend on the construction of UHV power grids.

In fact, the “Twelfth Five-Year Plan” outline has clearly put forward the development of large-capacity, high-efficiency, long-distance advanced transmission technologies such as UHV. As there was a lot of controversy about the construction of UHV in academic circles, this measure marked that UHV construction has been promoted as a national strategy. The development of UHV has become the top priority for the development of the “Twelfth Five-Year Plan” power grid.

Establish "three horizontal and three vertical"

The “Twelfth Five-Year Plan” outline is clear. During the “Twelfth Five-Year Plan” period, the construction of large-scale power transmission projects for coal-fired power, hydropower, and wind power bases will be accelerated, and a number of cross-regional transmission channels using advanced UHV technology will be formed to build 330 kV. And more than 200,000 kilometers of transmission lines. On the one hand, strict control of new thermal power projects in the eastern regions and other regions will no longer provide new coal-fired power plants in large and medium-sized cities and their surrounding areas. All the required power will be solved through the western power transmission, and the deteriorating air quality will also be improved. On the other hand, we will continue to promote “West Power Transmission to the East” and “North Power Transmission to the South” to build ultra-high voltage and UHV transmission lines.

In short, it is on the one hand to control eastern thermal power, and on the other hand to convert coal, water and new energy into electricity in the western part of the country, and then transport it to the east through the smart grid to realize energy “walking in the air”. According to the State Grid Corporation of China, the shape of the power grid has changed from the “long-chain” of northeast-northern-north-central China to the “mass-like” structure of North China-East China-Central China (hereinafter referred to as “Sanhua Power Grid”), with the northwest, northeast and south sides. Through the direct link between the three synchronous power grids, “Sanhua Power Grid” will increase the ratio of coal transmission and transmission in the “Three West” area of ​​the main coal production area from the current 20:1 to 6:1.

According to relevant plans, China will build a “three vertical and three horizontal” UHV backbone backbone and 13 DC transmission projects (including 10 UHV DCs) that will connect large energy bases and major load centers to form a large-scale “West Power East”. Send "and" north power south to send" energy allocation pattern. By 2015, a strong smart grid will basically be built, and the “Three Chinas” (North China, Central China, East China), Northwest, and Northeast synchronous power grids will be formed. For the progress of UHV work in 2011, the State Grid has made it clear that it is necessary to ensure that the Huainan (Taiwan)-Shanghai UHV AC project is approved in the first quarter and that the Ximeng-Nanjing UHV AC project will be approved in the first half of the year. Mengxi-Changsha and Jing Bian-Lianyungang [8.39 4.48% shares] UHV AC project and Xiluodu-Zhexi, Hami-Henan UHVDC project were approved during the year. Last year's approval was slow.

If it is successfully implemented, this means that six lines will be built, far beyond the scale of 2010, and bring a huge wave of investment in equipment. According to the two lines of the Xiluodu-Zhexi and Hami-Henan UHVDC projects, according to the Shenwan Institute, it is expected to invest 19.4 billion yuan and 23 billion yuan respectively. If all six lines are opened, the amount of investment will be huge.

At the same time, the power of the large coal-fired power plants was transported to the East Central Load Center by UHV. After the cost of transmission links was removed, the electricity price was still lower than the average on-grid electricity price of the local coal power of 0.06-0.13 yuan/kWh, and at the same time it saved 15 million yuan. Kilowatts, saving power investment of 56 billion yuan; accepting 145 million kilowatts of new clean energy, equivalent to 450 million tons of carbon dioxide emission reduction each year, reducing environmental losses by 4.5 billion yuan each year.

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