The hottest industry observation - power grid from

2022-10-19
  • Detail

Industry observation - electricity: from 23000 kilometers to 688000 kilometers

energy and electricity in the 40 years of reform and opening up -

from 23000 kilometers to 688000 kilometers

transmission lines of 220 kV and above have reached 688000 kilometers, and the variable capacitance has reached 4 billion KVA

China power xiewenchuan

over the past 40 years of reform and opening up, China's economic and social development has made remarkable achievements, and its economic aggregate has leapt to the second place in the world; The rapid growth of electricity consumption, the total electricity consumption jumped to the first place in the world, which effectively supported the rapid development of economy and society

at the beginning of reform and opening up, the national electricity coverage was less than half, and the electricity consumption of the whole society was only 249.8 billion kwh. After 40 years of development, the national power construction has made remarkable achievements. The highest voltage level has gradually developed from 220 kV and 500 kV to the current. In recent years, the Canadian government and its emphasis on the development of recycling industry have been 1000 kV and ± 800 kV, and the voltage level distribution is becoming more and more perfect. By the end of 2017, the total length of 220 kV and above transmission lines in China had reached 688000 kilometers, 30 times that of 1978, equivalent to 17 times around the earth. The transformation capacity reached 4 billion KVA, an increase of more than 157 times compared with the beginning of the reform; And comprehensively solve the problem of electricity consumption for the population without electricity in 2015

expand the scale of electricity and break through regional barriers

at the beginning of reform and opening up, China's electricity construction was relatively backward. The length of transmission lines of 220 kV and above was only 23000 kilometers, and the variable capacitance was about 25.28 million KVA. The highest voltage level is the 330 kV AC transmission line from Longyangxia to Tianshui to Guanzhong of northwest electric power, which was completed and put into operation on June 6, 1972

in order to change this situation, China increased investment in key industries with limited funds from 1979 to 1989. The cumulative investment in basic industries and infrastructure construction was 547.9 billion yuan, with an average annual growth of 10.7%, and power construction was also carried out on a large scale during this period

by the 1990s, China's regional electricity structure had basically taken shape, and the northeast, northwest, North China, East China and South associated companies had been formed. However, Shandong, Fujian, Sichuan (including Chongqing), Hainan, Xinjiang and Tibet autonomous regions were all independent electricity independent of the surrounding provinces and regions. The northeast, northwest, North China, East China and South associated companies and Sichuan Chongqing power are also not connected to each other

since 1999, China has successively completed the interconnection of Northeast power and North China power, central China power and northwest power. In May, 2001, a 500 kV AC line from Suizhong, Liaoning Province to jiangjiaying, Hebei Province was completed, connecting Northeast power with North China power, and Northeast power and North China power became a synchronous power. The construction of Lingbao Converter Station was started in February, 2003, and the DC system was successfully unlocked on April 11, 2005, realizing the connection between central China power and Northwest China power

in order to solve the problem of sending 10million kW of power to Guangdong, it was proposed in August 2000 to build a 500 kV DC transmission project from the Three Gorges to Guangdong and put into operation in June 2004; Huazhong power and Nanfang power become interconnected asynchronous power. During this period, China also completed the connection between Hainan Island and the mainland, and the power supply from the mainland to Hong Kong and Macao

the fifth session of the Seventh National People's Congress officially approved the construction of the Three Gorges Hydropower Station on the Yangtze River, According to the Ninth Five Year Plan of electric power "With the completion of the Three Gorges project, it can be predicted that a national unified power transmission project will be formed, which will basically cover most parts of the country. In addition, the construction of the Three Gorges power transmission channel has also created conditions for the implementation of the west to East power transmission.

after the State Council agreed to speed up the construction of the west to East power transmission project through appropriate thermal processing technology, the first batch of West to East power transmission projects in Guizhou and Yunnan in the same year The commencement of construction marks the full start of China's west to East power transmission project. The third line of West to East power transmission further realizes the interconnection between electricity

subsequently, China began the construction of UHV. In 2010, China completed and put into operation two ± 800 kV high-voltage DC transmission lines (Yunguang, Shangshang), achieving a historic breakthrough in UHV from scratch. Relying on the UHV power structure, a national power allocation pattern of "power transmission from the west to the East, power supply from the north to the south, mutual assistance between water and fire, and complementary scenery" has been formed. At present, the trans regional and trans provincial transmission capacity has exceeded 200million kW, and the trans provincial exchange of electricity has exceeded 1trillion kwh. The renewable energy capacity within the dispatching scope of the State Grid Corporation of China has reached 510 million KW, ranking first in the world

up to now, China has put into operation 21 UHV projects of "8 AC and 13 DC", ensuring the new power supply of 1.7 billion kw, meeting the new power demand of 6 trillion kwh, and supporting the rapid development of social economy. The power allocation resource pattern of "power transmission from west to East, mutual supply from north to south, and nationwide connection" has been basically completed. Eight 1000 kV high-voltage AC lines and 13 ± 800 kV high-voltage DC lines have been put into operation successively. The large scale of power resources has made clear changes to the different requirements of customers, and the allocation has become the norm

from 2006 to 2017, China's trans regional transmission capacity has increased five times, and the scale of power output in the southwest, northwest and central China is the largest, accounting for more than three quarters in total; Among the 34 provinces and cities, the net power output of 20 provinces and cities exceeds 10 TWH, and the net power input of 13 provinces and cities exceeds 10 TWH; As the southwest region rich in hydropower resources, Yunnan and Sichuan are the provinces with the largest proportion of inter provincial electricity transmission in China, with an annual average of more than 40% in 2017; As the cities with the largest population density, Beijing and Shanghai use more than 40% of their annual electricity from outside

improve the reliability of power supply to ensure the last kilometer

in the early stage of reform and opening up, the electrical structure was weak, system accidents often occurred, and the power quality was also very poor. Over the past 40 years, China has comprehensively promoted power construction at all levels, implemented multiple rounds of urban and rural power transformation and agricultural transformation and upgrading, and improved power reliability and power supply quality

at the beginning of reform and opening up, the State Council deployed the tasks of building 100, 200 and 300 Rural Hydropower primary electrification counties during the "Seventh Five Year Plan", "Eighth Five Year Plan" and "Ninth Five Year Plan" period, respectively, in the documents of Guo Fa [1983] No. 190, Guo Fa [1991] No. 17 and Guo ban Tong [1996] No. 2

In August, 2004, the national development and Reform Commission issued the notice on improving the investment scale and relevant requirements of agricultural transformation in the western region, requiring that the improvement of agricultural transformation in the western region should be implemented in accordance with the relevant policies of agricultural transformation, improve the management of agricultural transformation projects in the western region, and implement the relevant provisions of agricultural transformation project management

since 2006, in the "No. 1 document" of the central government, the construction of rural infrastructure has been placed in a prominent and important position, and the development of rural power industry has been clearly and specifically stated. In October, 2008, the Third Plenary Session of the 17th CPC Central Committee put forward specific goals, such as strengthening rural infrastructure and environmental construction, and expanding the population coverage of power supply. Document No. 1 of 2010 requires that a new round of rural power transformation and upgrading project be implemented as soon as possible

in November 2010, the general office of the national development and Reform Commission issued the "management measures for rural power transformation and upgrading projects", which systematically standardized some problems that will be encountered in the management process of rural power transformation and upgrading projects. With the promulgation of the "management measures", a new round of rural power transformation and upgrading has gradually entered the substantive implementation stage

during the 12th Five Year Plan period, rural electricity in China has been generally transformed, rural residents' living electricity has been better guaranteed, the problem of electricity for agricultural production has been basically solved, the "escrow system" of county-level power supply enterprises has been completely abolished, the goal of the same price for urban and rural electricity has been fully realized, and a new type of rural electricity with safety, reliability, energy conservation, environmental protection, advanced technology and standardized management has been basically built

after a series of work to improve the quality of power supply, the national power supply reliability rate is more than 99.81%, including more than 99.94% in cities and more than 99.77% in rural areas. The level of power security has been continuously improved. In the face of challenges such as the continuous expansion of the scale of power construction, frequent natural disasters, and large-scale access to new energy, the overall stability of the national power security situation has been maintained, and no large-scale blackouts have occurred, providing a strong guarantee for economic and social development

reliable power guarantee has improved the degree of electrification in China. Up to now, only in the national power region, more than 100000 projects of replacing coal and oil with electricity have been promoted, 360billion kwh of alternative electricity has been completed, and 500million square meters of clean heating in northern China have been promoted. Compared with 2000, the proportion of electric energy in terminal energy consumption in China has increased by 12 percentage points, 8 percentage points higher than the global average

40 years. As an important foundation and guarantee for modern economic development and social progress, electricity has made remarkable achievements. With the rapid development of new energy and the improvement of re electrification level, China will build a more reliable electricity structure, build energy interconnection, vigorously promote the innovative development of electricity, and provide an inexhaustible driving force for the economic and social development of the new era in the future. (data source of this article: China electricity Union)

: Wang Ping

Copyright © 2011 JIN SHI