“The average time for blackouts in our cities has entered the one-hour era.†This is a sentence of the Power Reliability Management Center of the State Electricity Regulatory Commission, MJ Jianhua, on the June 4th power reliability indicator conference. On the same day, the press conference revealed that the reliable power supply rates of Zhongshan Power Supply Bureau and Foshan Power Supply Bureau have reached “four ninesâ€, and the average power outage time of users is 39.6 minutes and 48 minutes, respectively.
Mi Jianhua said that as a comprehensive embodiment of the entire power system's service level to power users, the power supply reliability index directly reflects the power supply capacity, the structure of power grids at all levels, the health status of power supply equipment, and the production management level.
This has also become, to a certain extent, the most convincing argument for the development of urban power grids.
Since 2002, the development of China's urban distribution network has shifted from "meeting supply demand" to "focusing on quality and efficiency", and the role of urban power grids in ensuring economic and social development and improving people's living standards has increased significantly.
At present, China's urban power grid is developing into a completely new model of network structure improvement, further enhancement of power supply capacity, continuous improvement of power supply reliability, and continuous improvement of the level of intelligence.
The scale and equipment of the distribution network have been developed and upgraded. On the Lianhua Mountain in Shenzhen, the statue of Deng Xiaoping quietly gazes ahead. Every night, at the foot of this plot, the land that he circled was brightly lit and the sky was red.
In Futian District, where Lotus Mountain is located, on December 29, 2008, the first distribution automation system of China Southern Power Grid was put into operation.
In 2007, the Shenzhen power grid exceeded 10 million kilowatts and became the fourth urban power grid in the country after Beijing, Shanghai and Suzhou. The area of ​​Shenzhen is only 1/6 of Shanghai, 1/9 of Suzhou and 1/17 of Beijing.
Like many cities in China, Shenzhen has ushered in the "growing troubles." China's cities generally have the characteristics of important users, dense population, and high electricity load. With the acceleration of urbanization, the task of ensuring the development of urban economy in urban power grids has become more and more important.
Raising the distribution network scale and equipment level has become the primary consideration for the development of urban power grids. "By implementing the pilot project of distribution automation, we further optimized and improved the distribution network structure of Yinchuan, significantly improved the level of distribution network technology and equipment, automated application levels, and improved the distribution network management, operation management capabilities and power supply reliability levels." As the country's first batch of distribution automation pilot cities, Yinchuan also passed the acceptance of the expert group and completed the distribution automation project.
A set of data corroborated the evaluation of the expert group, Yinchuan distribution line loss rate decreased from 10.59% to 4.5%; fault isolation time from 1.3 hours to 10 minutes, the average user power outage time from 6 hours to 2.6 hours, non-failure area The power outage time was shortened from an average of 30 minutes to 5 minutes.
After more than ten years of development, the scale and equipment of China's urban distribution network have achieved considerable development and a greater degree of improvement.
At present, the scale of China's power grid has ranked first in the world. During the “Eleventh Five-Year Plan†period, the length of China’s 35 kV and above transmission lines increased from 973,000 km in 2005 to 1.30 million km in 2010, with a cumulative increase of 34%. Increased by 6.0%. The 35 kV and above substation capacity increased from 1.82 billion kVA in 2005 to 3.65 billion kVA in 2010, a cumulative increase of 101%, and an average annual increase of 14.9%.
From the "11th Five-Year Plan" period, China's total social power consumption growth has increased from 2.48 trillion kWh in 2005 to 4.19 trillion kWh in 2010, a cumulative increase of 69%, an average annual growth of 11.1%, and GDP growth. Basically the same.
The improvement of urban distribution network performance also leads to a continuous decrease in line loss rate. In 2011, the transmission line loss rate of China's power grid was 6.31%, a year-on-year decrease of 0.22 percentage points.
"After the development in recent years, the distribution network scale and equipment level of the State Grid Corporation of China have achieved significant development and a greater degree of improvement."
According to Deng Yonghui, Director of Maintenance and Maintenance Department of State Grid Corporation of China, as of the end of 2011, the distribution network of State Grid Corporation of China 6 to 10 (20) kV distribution lines reached 514,500 kilometers, distribution transformer capacity of 292 million kVA, distribution transformers Compared with the end of the “10th Five-Year Plan†period, 790,000 units increased by 110.46%, 131.05% and 107.16% respectively; the cable distribution rate of the 10KV urban distribution network reached 39.44%, and the insulated rate of the overhead line reached 48.22%. Line N- 1 The ratio reached 66.48%; the rate of cable in the core area of ​​28 major cities (excluding Xining, Urumqi, and Lhasa) of State Grid Corporation was 82.3%, the insulation rate of overhead lines was 93.7%, and the communication rate of distribution lines was 96.1%. The urban comprehensive power supply voltage qualification rate and the reliability of urban users' power supply increased by 0.42 and 0.166 percentage points from the same period of 2005.
Correspondingly, the proportion of investment in China Southern Power Grid's construction of low-voltage power grids in total power grid construction has increased year by year. As of 2011, the coverage rate of distribution automation circuits of Guangzhou Power Supply Bureau, Shenzhen Futian Power Supply Bureau, and Zhongshan Power Supply Bureau reached 41%, 75%, and 100%, respectively.
At present, the structure of the urban power grid that has achieved the power supply of the backbone network has been further improved, and the resource allocation capacity has been significantly improved, which has become the most solid force to ensure the overall development of the urban economy and society.
The reliability of urban power supply has been greatly increased as a comprehensive characterization of the production capacity of power supply companies and the level of social services. The reliability of power grids reflects the level of distribution network construction and production safety, technical operation management, and power supply of major power grids. It is a grid structure for power supply enterprises. The comprehensive evaluation of equipment, equipment level, production management and control, technical means, emergency support capability, quality service, staff quality, and team construction are carried out in all aspects of safety, production, marketing, and comprehensive management.
As the scale and equipment level of urban power grids have been developed and improved to a large extent, the reliability of power supply has also been greatly improved as a city distribution network that is closest to customers and directly determines the power quality of customers.
During the “Eleventh Five-Year Plan†period, the average outage rate of 10 kilovolt users across the country increased from 99.849% to 99.920%. It is equivalent to the average annual power outage time of users dropped from 13.191 hours in 2006 to 7.012 hours in 2011, making significant progress.
From a city perspective, in the core areas of the 28 major cities in the State Grid Corporation, the reliable rate of power supply in the core areas of 7 cities exceeds 99.99%, and the reliable rate of power supply in the core areas of 16 cities is in the range of 99.97% to 99.99%.
In the 10 years of development, China Southern Power Grid has generally established a quantitative assessment and early warning and pre-control mechanism for the operation risk of the three-tier power grids in the provinces and territories. We will comprehensively strengthen the governance of the main network, regional power grids, and unit operations. A number of cities in the China Southern Power Grid rank among the top in the list of gold companies for reliability of supply reliability in recent years.
"Urban users have the highest power supply reliability in the country, and the shortest outage time in the country." This sentence has become the business card of the Zhongshan Power Supply Bureau.
The intelligentization level of urban power grids is enhanced. “Sitting in the office, you can observe the power consumption in your home at any time through the Internet; on the way home from work, make a phone call and you can start your home’s water heater and rice cooker...†These have been repeatedly played. Advertising slogans have now become a reality in smart communities in many cities in China.
With the coordinated advancement of the development of power grids at all levels in China, the construction of China's urban distribution network has higher requirements in terms of depth, breadth, and technological innovation: the "brains" of the power grid while the "limbs" of the power grid are constantly strengthening. The level of intelligence is further strengthened.
At present, the urbanization rate in China has increased from 17.9% in 1978 to 47% in 2011, and the number of cities has reached more than 660. As the urbanization rate further increases, the transformation of power grid development modes will also affect the broader and deeper extent. people's lives.
During the “Eleventh Five-Year Plan†period, the blueprint for the construction of smart grids in China began slowly. In 2009, the State Grid Corporation of China and China Southern Power Grid Corporation all proposed a smart grid development plan.
At present, in several cities such as Chengdu, China, smart meters have achieved automatic meter reading and automatic transfer payments. However, the development of smart grids is far more than this. It has changed the concept of people's energy consumption and increased the consumption of electricity in energy terminals. The proportion of optimization of the city's energy use structure, so that more clean energy into people's lives.
One notable feature is that it has spawned the development of smart home appliances, smart homes, smart buildings, smart communities, intelligent transportation, and electric vehicles in many first-tier cities, and has promoted the construction of smart cities.
In enhancing the efficiency of the comprehensive utilization of social resources, the intelligent application of electricity will comprehensively improve the overall efficiency of power generation, transmission and distribution, and power supply facilities, and promote the energy users to save energy and reduce consumption. At the same time, through the implementation of smart power grid-to-home and other smart grid projects, the grid will be integrated with the telecommunications network, radio and television networks, the Internet, etc., relying on a wealth of power grid network resources to build an open public network service platform, significantly reducing the number of redundant construction And investment to achieve comprehensive utilization and conservation of social resources.
The emergence of smart grids defines the development path of future cities, and it also truly interprets the proposition that "electricity makes cities better."
Mi Jianhua said that as a comprehensive embodiment of the entire power system's service level to power users, the power supply reliability index directly reflects the power supply capacity, the structure of power grids at all levels, the health status of power supply equipment, and the production management level.
This has also become, to a certain extent, the most convincing argument for the development of urban power grids.
Since 2002, the development of China's urban distribution network has shifted from "meeting supply demand" to "focusing on quality and efficiency", and the role of urban power grids in ensuring economic and social development and improving people's living standards has increased significantly.
At present, China's urban power grid is developing into a completely new model of network structure improvement, further enhancement of power supply capacity, continuous improvement of power supply reliability, and continuous improvement of the level of intelligence.
The scale and equipment of the distribution network have been developed and upgraded. On the Lianhua Mountain in Shenzhen, the statue of Deng Xiaoping quietly gazes ahead. Every night, at the foot of this plot, the land that he circled was brightly lit and the sky was red.
In Futian District, where Lotus Mountain is located, on December 29, 2008, the first distribution automation system of China Southern Power Grid was put into operation.
In 2007, the Shenzhen power grid exceeded 10 million kilowatts and became the fourth urban power grid in the country after Beijing, Shanghai and Suzhou. The area of ​​Shenzhen is only 1/6 of Shanghai, 1/9 of Suzhou and 1/17 of Beijing.
Like many cities in China, Shenzhen has ushered in the "growing troubles." China's cities generally have the characteristics of important users, dense population, and high electricity load. With the acceleration of urbanization, the task of ensuring the development of urban economy in urban power grids has become more and more important.
Raising the distribution network scale and equipment level has become the primary consideration for the development of urban power grids. "By implementing the pilot project of distribution automation, we further optimized and improved the distribution network structure of Yinchuan, significantly improved the level of distribution network technology and equipment, automated application levels, and improved the distribution network management, operation management capabilities and power supply reliability levels." As the country's first batch of distribution automation pilot cities, Yinchuan also passed the acceptance of the expert group and completed the distribution automation project.
A set of data corroborated the evaluation of the expert group, Yinchuan distribution line loss rate decreased from 10.59% to 4.5%; fault isolation time from 1.3 hours to 10 minutes, the average user power outage time from 6 hours to 2.6 hours, non-failure area The power outage time was shortened from an average of 30 minutes to 5 minutes.
After more than ten years of development, the scale and equipment of China's urban distribution network have achieved considerable development and a greater degree of improvement.
At present, the scale of China's power grid has ranked first in the world. During the “Eleventh Five-Year Plan†period, the length of China’s 35 kV and above transmission lines increased from 973,000 km in 2005 to 1.30 million km in 2010, with a cumulative increase of 34%. Increased by 6.0%. The 35 kV and above substation capacity increased from 1.82 billion kVA in 2005 to 3.65 billion kVA in 2010, a cumulative increase of 101%, and an average annual increase of 14.9%.
From the "11th Five-Year Plan" period, China's total social power consumption growth has increased from 2.48 trillion kWh in 2005 to 4.19 trillion kWh in 2010, a cumulative increase of 69%, an average annual growth of 11.1%, and GDP growth. Basically the same.
The improvement of urban distribution network performance also leads to a continuous decrease in line loss rate. In 2011, the transmission line loss rate of China's power grid was 6.31%, a year-on-year decrease of 0.22 percentage points.
"After the development in recent years, the distribution network scale and equipment level of the State Grid Corporation of China have achieved significant development and a greater degree of improvement."
According to Deng Yonghui, Director of Maintenance and Maintenance Department of State Grid Corporation of China, as of the end of 2011, the distribution network of State Grid Corporation of China 6 to 10 (20) kV distribution lines reached 514,500 kilometers, distribution transformer capacity of 292 million kVA, distribution transformers Compared with the end of the “10th Five-Year Plan†period, 790,000 units increased by 110.46%, 131.05% and 107.16% respectively; the cable distribution rate of the 10KV urban distribution network reached 39.44%, and the insulated rate of the overhead line reached 48.22%. Line N- 1 The ratio reached 66.48%; the rate of cable in the core area of ​​28 major cities (excluding Xining, Urumqi, and Lhasa) of State Grid Corporation was 82.3%, the insulation rate of overhead lines was 93.7%, and the communication rate of distribution lines was 96.1%. The urban comprehensive power supply voltage qualification rate and the reliability of urban users' power supply increased by 0.42 and 0.166 percentage points from the same period of 2005.
Correspondingly, the proportion of investment in China Southern Power Grid's construction of low-voltage power grids in total power grid construction has increased year by year. As of 2011, the coverage rate of distribution automation circuits of Guangzhou Power Supply Bureau, Shenzhen Futian Power Supply Bureau, and Zhongshan Power Supply Bureau reached 41%, 75%, and 100%, respectively.
At present, the structure of the urban power grid that has achieved the power supply of the backbone network has been further improved, and the resource allocation capacity has been significantly improved, which has become the most solid force to ensure the overall development of the urban economy and society.
The reliability of urban power supply has been greatly increased as a comprehensive characterization of the production capacity of power supply companies and the level of social services. The reliability of power grids reflects the level of distribution network construction and production safety, technical operation management, and power supply of major power grids. It is a grid structure for power supply enterprises. The comprehensive evaluation of equipment, equipment level, production management and control, technical means, emergency support capability, quality service, staff quality, and team construction are carried out in all aspects of safety, production, marketing, and comprehensive management.
As the scale and equipment level of urban power grids have been developed and improved to a large extent, the reliability of power supply has also been greatly improved as a city distribution network that is closest to customers and directly determines the power quality of customers.
During the “Eleventh Five-Year Plan†period, the average outage rate of 10 kilovolt users across the country increased from 99.849% to 99.920%. It is equivalent to the average annual power outage time of users dropped from 13.191 hours in 2006 to 7.012 hours in 2011, making significant progress.
From a city perspective, in the core areas of the 28 major cities in the State Grid Corporation, the reliable rate of power supply in the core areas of 7 cities exceeds 99.99%, and the reliable rate of power supply in the core areas of 16 cities is in the range of 99.97% to 99.99%.
In the 10 years of development, China Southern Power Grid has generally established a quantitative assessment and early warning and pre-control mechanism for the operation risk of the three-tier power grids in the provinces and territories. We will comprehensively strengthen the governance of the main network, regional power grids, and unit operations. A number of cities in the China Southern Power Grid rank among the top in the list of gold companies for reliability of supply reliability in recent years.
"Urban users have the highest power supply reliability in the country, and the shortest outage time in the country." This sentence has become the business card of the Zhongshan Power Supply Bureau.
The intelligentization level of urban power grids is enhanced. “Sitting in the office, you can observe the power consumption in your home at any time through the Internet; on the way home from work, make a phone call and you can start your home’s water heater and rice cooker...†These have been repeatedly played. Advertising slogans have now become a reality in smart communities in many cities in China.
With the coordinated advancement of the development of power grids at all levels in China, the construction of China's urban distribution network has higher requirements in terms of depth, breadth, and technological innovation: the "brains" of the power grid while the "limbs" of the power grid are constantly strengthening. The level of intelligence is further strengthened.
At present, the urbanization rate in China has increased from 17.9% in 1978 to 47% in 2011, and the number of cities has reached more than 660. As the urbanization rate further increases, the transformation of power grid development modes will also affect the broader and deeper extent. people's lives.
During the “Eleventh Five-Year Plan†period, the blueprint for the construction of smart grids in China began slowly. In 2009, the State Grid Corporation of China and China Southern Power Grid Corporation all proposed a smart grid development plan.
At present, in several cities such as Chengdu, China, smart meters have achieved automatic meter reading and automatic transfer payments. However, the development of smart grids is far more than this. It has changed the concept of people's energy consumption and increased the consumption of electricity in energy terminals. The proportion of optimization of the city's energy use structure, so that more clean energy into people's lives.
One notable feature is that it has spawned the development of smart home appliances, smart homes, smart buildings, smart communities, intelligent transportation, and electric vehicles in many first-tier cities, and has promoted the construction of smart cities.
In enhancing the efficiency of the comprehensive utilization of social resources, the intelligent application of electricity will comprehensively improve the overall efficiency of power generation, transmission and distribution, and power supply facilities, and promote the energy users to save energy and reduce consumption. At the same time, through the implementation of smart power grid-to-home and other smart grid projects, the grid will be integrated with the telecommunications network, radio and television networks, the Internet, etc., relying on a wealth of power grid network resources to build an open public network service platform, significantly reducing the number of redundant construction And investment to achieve comprehensive utilization and conservation of social resources.
The emergence of smart grids defines the development path of future cities, and it also truly interprets the proposition that "electricity makes cities better."
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