Developing a smart grid is imminent
The smart grid of the future is the “energy Internet” with strong grid, wide interconnection, high intelligence and open interaction. UHV is the strong foundation of the smart grid network and the primary component of the energy Internet.
On March 6, Yu Xinqiang, assistant general manager of State Grid Corporation, said in an interview: "Developing UHV is the inevitable guarantee of national energy security, improving energy efficiency, serving clean energy development, promoting ecological civilization construction, especially solving smog problems. select."
It is understood that the problem of smog in the eastern and central regions of China is prominent, and the large-scale centralized construction of coal power is one of the important reasons. The coal-fired installed capacity of the Beijing-Tianjin-Hebei and Yangtze River Delta regions, which are severely hazy, exceeds 130 million kilowatts and 140 million kilowatts respectively. The installed capacity of coal-fired power per unit area is 13 times and 26 times that of the northwestern region, respectively. More than five times the national average.
Statistics show that sulfur dioxide, nitrogen oxides and soot emissions from coal combustion account for 86%, 56% and 74% of the national total. 50% to 60% of PM2.5 is derived from coal combustion. Among them, the sulfur dioxide emissions of direct-fired coal are equivalent to that of coal, and the amount of soot emissions is close to three times that of coal, which is the main source of air pollution. Although coal for power generation has higher energy efficiency and less pollution than direct-fired coal, it is concentrated in the eastern and central regions due to the large total consumption of coal, and is also an important source of air pollution.
In response to this pollution situation, Yu Xinqiang believes that the development of UHV power grids, replacing coal transmission with power transmission, and increasing the proportion of external power receiving, can significantly improve the atmospheric conditions in the eastern and central regions.
According to the State Grid Corporation's plan, by 2015, 2017, and 2020, the trans-regional transmission capacity will reach 210 million kilowatts, 290 million kilowatts, and 450 million kilowatts respectively, and the amount of electricity delivered to the eastern and central regions will reach 0.74 trillion kilowatts and 1.18, respectively. Trillion kWh, 1.87 trillion kWh. According to this calculation of electricity consumption, it can effectively reduce the consumption of thermal coal in the central and central regions by 340 million tons, 540 million tons and 850 million tons, while the PM2.5 emissions in the eastern and central regions can be reduced by 9.4%, 15.8% and 22.6% respectively compared with 2010. . It can be seen that accelerating the UHV can solve the serious problem of smog in the central and eastern regions from the source. In this regard, Yu Xinqiang proposed to include the UHV project in the implementation plan of the National Air Pollution Prevention Action Plan.
More than 70% of China's coal, hydropower, wind and solar energy resources are concentrated in the western and northern regions, while energy load centers are mainly distributed in the eastern and central regions. The uneven distribution of energy resources and productivity makes it difficult for China to rely on traditional power grids to meet the energy needs of the eastern and central regions.
In order to cope with China's growing energy demand, to solve the imbalance in the geographical distribution of energy resources and electricity demand, to meet the requirements of the low-carbon social and economic development model for power systems, it is extremely urgent to accelerate the development of smart grids. As a result, State Grid Corporation released the “Strong Smart Grid” development plan in May 2009.
According to the reporter, according to the plan, the development of “Strong Smart Grid” is divided into three stages: 2009-2010 is the planning pilot stage, focusing on the development of strong smart grid development planning technical standards and management specifications, key technology research and development and equipment development. And pilot work in all aspects; 2011-2015 is a comprehensive construction phase, accelerating the construction of UHV power grids and urban and rural distribution networks; and building a unified “strong smart grid” from 2016 to 2020.
In July 2013, the State Council executive meeting listed the “strengthening the construction of urban distribution networks and promoting the intelligentization of power grids” as the focus of work when researching and deploying and strengthening urban infrastructure construction.
State Grid Corporation said that during the "Twelfth Five-Year Plan" period, it will invest 500 billion yuan to build a "three horizontal and three vertical" exchange UHV backbone grid and 13 long-distance DC transmission projects connecting large energy bases and main load centers. Built a world-class "strong smart grid." In addition, the development plan of China Southern Power Grid proposes that the construction of smart grids will be promoted, and by 2020, the automation coverage rate of urban distribution networks will reach 80%.
Supporting frequent policies has driven the smart grid industry to continue to heat up. It is understood that the investment in the national grid will reach 3 trillion yuan in the next 8 years, of which the UHV grid will occupy 950 billion yuan. The huge market capacity means that the determination of the continued high growth of the smart grid is very strong, significantly higher than the market average. "The market value brought by the smart grid is no less than the wave of informationization," industry experts said.
UHV will alleviate air pollution in China
Due to the long-term pursuit of power local balance, China's energy allocation is over-reliant on coal transportation, the proportion of transmission is low, the structure is out of balance, and the energy supply chain is very fragile.
Statistics show that in 2013, more than 50% of coal was used for power generation, 58% of railway capacity was used for coal transportation, and about 70% of coal was transported by rail. The proportion of coal transportation and transmission in the area where Huadong Coal is transferred is about 48:1, and the proportion of coal transportation in the coal-removed areas of “Sanxi” (Shanxi, Shaanxi, Mengxi) is about 15:1. It can be seen that the problem of tight electricity and coal transportation caused by the local balance of power is very prominent.
To solve these problems fundamentally, in the view of Yu Xinqiang, the key lies in accelerating the transformation of the energy development mode that relies excessively on coal transportation and the partial development of the power development mode, implementing the “one special four major” strategy, and building the UHV as the backbone network. Building a strong smart grid coordinated by the power grids at all levels, building large-scale coal-fired, hydropower, nuclear power and renewable energy bases, “achieving the “coal from the air and sending electricity to China”, promoting the optimal allocation of energy resources nationwide. Efficient use can greatly reduce the installed density of coal and electricity in the central and eastern regions."
It is understood that the conditions for the large-scale construction of UHV power grids in China are already in place. In recent years, it has built five ultra-high voltage AC and DC projects with the highest voltage, largest capacity and leading technology in the world. It has been safely operated and fully verified the safety, economy and environmental friendliness of UHV. Sex. “During the peak summer season, the load of many places has hit a record high, and the UHV large power grid has fully played its role in optimizing the allocation of resources, effectively alleviating the tension between supply and demand.” Yu Xinqiang said.
At the same time, UHV has won a number of national awards. China has fully mastered the UHV core technology and complete equipment manufacturing capabilities, and achieved "China's creation" and "China's leading".
According to the plan of the State Grid Corporation, by 2020, it will form an energy allocation pattern connecting various large-scale energy bases and major load centers, large-scale “West-to-East Power Transmission” and “Nortel Power Transmission to South China”, with a trans-regional transmission capacity of 450 million kilowatts. Guaranteed 550 million kilowatts of clean energy to be sent out and consumed.
At that time, the power flow in the eastern and central regions will reach 350 million kilowatts, and the annual transmission capacity will be 1.9 trillion kilowatt hours. The power flow into the area is 2.69 times and 2.5 times that of the coal-fired power capacity in the Beijing-Tianjin-Hebei and Yangtze River Delta regions, which are severely foggy in the central and eastern regions.
Obviously, in the long run, the development of UHV will fundamentally help alleviate the problem of air pollution in China.