Smart Grid: Eliminating haze

Developing a smart grid is imminent

The smart grid of the future is a "energy internet" with a strong, widely connected, highly intelligent, open and interactive network. UHV is the strong foundation of the smart grid network and is the primary component of the energy internet.

On March 6, Yu Xinqiang, assistant to the general manager of the State Grid Corporation of China, said in an interview: “The development of UHV is an inevitable guarantee for ensuring national energy security, improving energy efficiency, serving the development of clean energy, promoting the construction of ecological civilization, and especially solving the problem of smog. select."

It is understood that the problem of haze in the eastern and central regions of China is outstanding, and the large-scale localization of coal-fired power is one of the important reasons. The coal-fired power plants in the Beijing-Tianjin-Shanbulu and Yangtze River Delta regions with severe haze are over 130 million kilowatts and 140 million kilowatts, respectively. The unit area of ​​coal-fired power is 13 times that of the northwest region and 26 times that of the northwest region. Air pollution emissions per unit area are The national average is more than 5 times.

Statistics show that the emissions of sulfur dioxide, nitrogen oxides, and soot from coal combustion account for 86%, 56%, and 74% of the national total respectively. 50% to 60% of PM2.5 is derived from coal combustion. Among them, the amount of sulfur dioxide emitted by direct-fired coal is equivalent to that of electric coal, and the dust emission is nearly three times that of electric coal, which is the most important source of air pollution. Although coal-fired power generation has higher energy efficiency and less pollution than direct-fired coal, it is concentrated in the eastern and central regions because of the large amount of coal consumed, which is also an important source of atmospheric pollution.

In response to this pollution situation, Yu Xinqiang believed that the development of UHV power grids, the use of electricity instead of coal transmission, and an increase in the proportion of electricity received by outside sources could significantly improve the atmosphere in the eastern and central regions.

According to the plans of the State Grid Corporation of China, the transregional transmission capacity will reach 210 million kilowatts, 290 million kilowatts, and 450 million kilowatts by 2015, 2017, and 2020, respectively, and the power transmission to the eastern and central regions will reach 0.74 trillion kilowatts and 1.18 respectively. Trillion kilowatts and 1.87 trillion kwh. According to the calculation of transmission capacity, the consumption of electric coal in the eastern and central regions can be effectively reduced 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 suggested that the UHV project should be included in the national air pollution prevention action plan. Since more than 70 percent of China’s coal, hydropower, wind, and solar energy resources are concentrated in the western and northern regions, the energy load centers are mainly distributed in the east. Central Region. The uneven distribution of energy resources and productivity has made 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, solve the imbalance in the geographical distribution of energy resources and electricity demand, meet the requirements of low-carbon socio-economic development model for the power system, and accelerate the development of smart grids is imminent. As a result, the State Grid Corporation of China released the “Strong Smart Grid” development plan in May 2009.

The reporter learned that according to the plan, the development of “Strong Smart Grid” is divided into three phases: 2009-2010 is a pilot phase for planning, focusing on the development of strong smart grid development planning, setting technical standards and management specifications, and conducting key technology research and development and equipment development And the pilot work for all links; 2011-2015 will be a comprehensive construction phase to accelerate the construction of UHV power grids and distribution networks for urban and rural areas; and a unified “strong and smart grid” will be built in 2016-2020.

In July 2013, the State Council Executive Meeting focused on “strengthening the construction of urban distribution networks and promoting the intelligentization of power grids” when it focused on research and deployment of strengthening urban infrastructure.

State Grid Corporation of China stated that it will invest 500 billion yuan in the “12th Five-Year Plan” period to build a “three horizontal and three vertical” exchange UHV backbone grid and 13 long-distance direct-current power transmission projects connecting large-scale energy bases and major load centers. Build a world-class "Strong Smart Grid." In addition, the development plan of China Southern Power Grid proposes to promote the construction of smart grids, and by 2020, the automatic coverage of urban distribution networks will reach 80%.

Supportive policies are frequent and the smart grid industry continues to heat up. It is understood that in the next eight years, the national grid investment will reach 3 trillion yuan, of which the UHV grid will occupy 950 billion yuan. The large market capacity means that the certainty of continuous high growth of the smart grid is very strong, obviously higher than the market average. "The market value brought by the smart grid is no less than the wave of informationization," said industry experts.

UHV will ease air pollution in China

Due to the long-term pursuit of power-on-site balance, China's energy allocation is over-reliance on coal transportation, the proportion of transmission is low, the structure is out of adjustment, 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 transmission and transmission in the East China Coal Imported Region is approximately 48:1, and the ratio of coal transmission for the “Three West” (Shanxi, Shaanxi, Mengxi) coal mining regions is approximately 15:1. It can be seen that the issue of electricity on-site balance leading to coal and electricity transportation is very prominent.

Fundamentally solving these problems, in Yu Xinqiang's view, the key lies in accelerating the transformation of energy development methods that rely too much on coal transportation and the local development methods of electric power development, implementing the “One Special Four” strategy and building the UHV as the backbone network. A strong and smart grid coordinated and developed at all levels of power grids to build large-scale coal-fired, hydropower, nuclear power, and renewable energy bases to “realize coal from the air and deliver electricity to China”, and promote the optimal allocation of energy resources nationwide. Efficient use can greatly reduce the installed coal power density in the Middle East.”

In order to cope with China's growing energy demand, solve the imbalance in the geographical distribution of energy resources and electricity demand, meet the requirements of low-carbon socio-economic development model for the power system, and accelerate the development of smart grids is imminent. As a result, the State Grid Corporation of China released the “Strong Smart Grid” development plan in May 2009.

The reporter learned that according to the plan, the development of “Strong Smart Grid” is divided into three phases: 2009-2010 is a pilot phase for planning, focusing on the development of strong smart grid development planning, setting technical standards and management specifications, and conducting key technology research and development and equipment development And the pilot work for all links; 2011-2015 will be a comprehensive construction phase to accelerate the construction of UHV power grids and distribution networks for urban and rural areas; and a unified “strong and smart grid” will be built in 2016-2020.

In July 2013, the State Council Executive Meeting focused on “strengthening the construction of urban distribution networks and promoting the intelligentization of power grids” when it focused on research and deployment of strengthening urban infrastructure.

State Grid Corporation of China stated that it will invest 500 billion yuan in the “12th Five-Year Plan” period to build a “three horizontal and three vertical” exchange UHV backbone grid and 13 long-distance direct-current power transmission projects connecting large-scale energy bases and major load centers. Build a world-class "Strong Smart Grid." In addition, the development plan of China Southern Power Grid proposes to promote the construction of smart grids, and by 2020, the automatic coverage of urban distribution networks will reach 80%.

Supportive policies are frequent and the smart grid industry continues to heat up. It is understood that in the next eight years, the national grid investment will reach 3 trillion yuan, of which the UHV grid will occupy 950 billion yuan. The large market capacity means that the certainty of continuous high growth of the smart grid is very strong, obviously higher than the market average. "The market value brought by the smart grid is no less than the wave of informationization," said industry experts.

UHV will ease air pollution in China

Due to the long-term pursuit of power-on-site balance, China's energy allocation is over-reliance on coal transportation, the proportion of transmission is low, the structure is out of adjustment, 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 transmission and transmission in the East China Coal Imported Region is approximately 48:1, and the ratio of coal transmission for the “Three West” (Shanxi, Shaanxi, Mengxi) coal mining regions is approximately 15:1. It can be seen that the issue of electricity on-site balance leading to coal and electricity transportation is very prominent.

Fundamentally solving these problems, in Yu Xinqiang's view, the key lies in accelerating the transformation of energy development methods that rely too much on coal transportation and the local development methods of electric power development, implementing the “One Special Four” strategy and building the UHV as the backbone network. A strong and smart grid coordinated and developed at all levels of power grids to build large-scale coal-fired, hydropower, nuclear power, and renewable energy bases to “realize coal from the air and deliver electricity to China”, and promote the optimal allocation of energy resources nationwide. Efficient use can greatly reduce the installed coal power density in the Middle East.”