Smart grid and UHV usher in spring

Recently, Japan’s nuclear crisis has made power development a global hot spot. After China suspends the approval of new nuclear power projects, what direction will the electricity use?

On March 26, Su Bo, Vice Minister of the Ministry of Industry and Information Technology , stated at the “2011 Economic Situation and Power Development Analysis and Forecasting Conference” sponsored by the China Electric Power Enterprise Federation, that it is necessary to vigorously develop related supporting technologies and equipment for the equipment industry and energy equipment manufacturing, and accelerate Promote the green and low-carbon development of energy equipment. 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. new energy

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. Now that power shortages are already ahead of schedule, it is not because of lack of coal. It is because new installed capacity is difficult to meet 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 the sub-portion length Ministry Soupault means, the development of advanced transmission technology and equipment, in particular the development of UHV large capacity, high-efficiency advanced transmission technology and equipment, to reduce large-scale, cross-regional power transmission line loss. 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 connection between the power 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 several 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 region and other regions will no longer provide new coal-fired power stations 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 west, and then transport it to the east through the smart grid to achieve 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. The three synchronous power grids are linked by DC. “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 related 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-scale 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 Edge - Lianyungang (601008, shares it) UHV AC project and Xiluodu - Zhejiang West, Hami - Henan UHV DC project 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, the Shenwan Institute expects 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 stations 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 in installed capacity. 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.

Investment will reach 2.5 trillion yuan

The development of UHV technology and the construction of smart grids have been fully opened. According to the prediction of related departments, during the “12th Five-Year Plan” period, total grid investment may reach 2.5 trillion yuan, an increase of approximately 70% over the same period of last year. The focus of this year's power grid construction is UHV. The Shenwan Institute expects that the "12th Five-Year Plan" UHV investment will reach 500 billion yuan, of which UHV AC investment will reach 300 billion yuan, and UHV DC line investment will reach 200 billion yuan.