Examines the highlights of the 2011 smart grid, UHV and other construction highlights
Standing in the year of the beginning of the “Twelfth Five-Year Plan†and looking back on 2011, China’s power grid construction can be regarded as a magnificent and hot spot. A number of world-renowned power grid projects have not been disconnected, built or operated. A huge amount of investment has made China's power grid more robust and reliable. Independent innovation has made China's power grid construction a new look.
Among them, the “Power Sky Road†Qinghai-Tibet DC connected to build a trial run, marking the full interconnection of China's mainland power grid; power grid equipment, technology and other external cooperation continued to deepen, the national power grid not only successfully acquired and took over the operation of seven transmission concession companies in Brazil, but also with the United States The power company signed an agreement to jointly promote UHV, smart grid and new energy construction; in the field of UHV long-distance transmission, China has become the world leader; in the field of strong smart grid, the construction of intelligent substation and electric vehicle charging and charging network is deepening , will become the makers of world standards; in the future construction of Internet of things, China's power grid has taken the lead in ... ... whether it is planning layout, investment scale, or scientific and technological innovation level, China's power grid with its huge body gradually realize the curve overtaking, gradually Leading position in the world.
Power Sky Road On December 9, an energy major artery linking Qinghai and Tibet - the Qinghai-Tibet Power Grid interconnection project was completed and commissioned, ending the long-term isolated network operation history of Tibet Power Grid, indicating that China's mainland power grid is fully interconnected and realized the Beijing national The direct dispatching of Tibet Power by the Power Dispatching Center lays the foundation for a fundamental solution to Tibet’s urban and rural residents’ lives and industrial and agricultural production and power issues. Moreover, it solved the problems such as the weak structure of the Haixi power grid in Qinghai and the shortage of power supply, and met the rapidly growing demand for electricity in the Qaidam circular economy pilot area.
The Qinghai-Tibet DC interconnection project is the world’s highest transmission and power transformation project with the highest altitude, the largest construction scale in the coldest region, and the most difficult construction problems. The main project connects Golmud, Qinghai and Lhasa, Tibet, with a total length of 1,038 km. In addition to the HVDC transmission lines and the two ±400 kV converter stations, the 750-kilovolt power transmission project in Xining-Riyueshan-Haixi-Geermu and the 220kV power grid project in Tibet were also built.
Comments:
The Qinghai-Tibet Networking Project has the highest altitude along the route and the longest "two worlds" in the construction of permafrost areas. It is necessary to overcome the "diagnosis of high plateau physiology and health, extremely fragile plateau ecological environment, difficulty in the construction of permafrost bases in plateau alpine regions, and high altitude overvoltages. There are four major engineering problems, such as insulation coordination and difficulty in equipment development, etc. At the same time, Tibet Power Grid and the Northwest (Qinghai) Power Grid are interconnected through the Qinghai-Tibet Networking Project, which can transfer electricity to support Tibet during the dry season and send surplus power during the wet season. We will thoroughly optimize the electricity supply structure in Tibet and fundamentally solve the problem of electricity shortage in Tibet.According to relevant departments' calculation, after the opening of the Qinghai-Tibet network project, it is expected that during the "Twelfth Five-Year Plan" period, about 4 billion kilowatt-hours of electricity will be delivered to Tibet to save the standard coal. 1.36 million tons, reducing carbon emissions by 3.55 million tons.
The two major power grids identified the development goals of the “Twelfth Five-Year Planâ€, and the State Grid Corporation of China 2011 working conference that ended on January 9 revealed that during the “Twelfth Five-Year Plan†period, the State Grid Corporation of China planned to build “three verticals connecting large energy bases and major load centersâ€. Sanheng’s UHV backbone backbone and 13 HVDC transmission projects (of which 10 UHV DC projects) form a large-scale energy distribution pattern of “West Power Transmission to the East†and “Northern Power Transmission to the Southâ€. By 2015, the State Grid Corporation of China will have a line length of more than 1 million kilowatts and 110,000 kilowatt-hours of substation capacity, with an average annual increase of 8.4% and 12.5% ​​respectively; sales volume will reach 3.8 trillion kwh, compared to 2010. The annual growth rate is 42%; State Grid Corporation's cross-regional resource allocation capacity has reached 250 million kilowatts...
On January 19, the work conference of China Southern Power Grid Company in 2011 made it clear that the main task of China Southern Power Grid during the “12th Five-Year Plan†period was to highlight the need to ensure safe and reliable power supply and improve its ability to control the large power grid. For this reason, in the next five years, China Southern Power Grid will further increase the investment in power grid development, of which the investment in fixed assets will exceed 500 billion yuan. During the “12th Five-Year Plan†period, China Southern Power Grid Co., Ltd. will add 17.3 million kilowatts of West-to-East power transmission, and the total size of West-to-East power transmission in 2015 will reach 43 million kilowatts. In addition, China Southern Power Grid Corporation also stated that it supports the development of clean energy and new energy, and accelerates the solution of new energy, renewable energy, and distributed integrated energy supply systems to effectively access the grid.
Comments:
Transmission has been considered as the "sixth mode of transportation" after roads, railways, waterways, aviation, and pipeline transportation. It will bring strong vitality to the construction of modern energy transmission channels and build safe, stable, economic, and clean modern energy sources. The industrial system plays an important role. In this regard, the Twelfth Five-Year Plan for National Economic and Social Development of China clearly states: “To meet the requirements for the large-scale cross-regional transmission of electricity and new energy for grid connection, accelerate the construction of a modern power grid system, and further expand the scale of West-to-East power transmission. Improve the regional backbone network, develop high-capacity, high-efficiency, and long-distance advanced transmission technologies such as ultra-high voltage, rely on advanced technologies such as information, control, and energy storage to promote the construction of smart grids, strengthen the construction and transformation of urban and rural power grids, and strengthen the optimization of power grid configuration. Capability and power supply reliability."
The first flexible HVDC transmission project in Asia operation On July 25, the first flexible HVDC transmission demonstration project in Asia, Shanghai Nanhui Wind Farm Flexible HVDC Transmission Project was put into operation. The project is linked to Shanghai Nanhui Wind Farm and Shuru Converter Station, with a transmission capacity of 20 MW, a DC voltage level of ±30 kV and a transmission distance of 8.6 km. It is the first in China to have fully independent intellectual property rights and a world-class level of flexible DC. The transmission line is also another major innovation achieved by China in the field of high-power power electronics, marking the State Grid Corporation becoming the third company in the world following ABB and Siemens to master the flexible DC transmission technology.
Flexible DC transmission is the internationally recognized best technology solution for renewable energy grid integration such as wind farms. It uses a new generation of DC transmission technology based on voltage source converters to independently control the phase and amplitude of the output voltage. Flexibly adjust the output active and reactive power, with outstanding advantages such as flexible operation mode, strong controllability, multiple applicable occasions, small floor space, and good environmental protection, etc., and excellent wind farm connection performance and strong anti-interference The capability can effectively improve the low-voltage ride-through capability, meet the transient performance requirements of the grid-connected system, and has broad application prospects in the field of new energy grid-connected, isolated islands, and urban distribution networks. The development of wind energy and solar energy resources in China is highly concentrated and away from the load center. Flexible DC transmission technology, with its significant technical features and advantages, has a broad application prospect in the field of new energy integration in China.
Comments:
The successful commissioning of the flexible HVDC transmission demonstration project indicates that the State Grid Corporation of China has occupied the technological commanding heights in the field of high-power power electronics, laying a solid technical foundation for the large-scale and centralized development of wind farms in China, and promoting the energy sector in China. The development of green environmental protection is of positive significance. The State Grid Corporation of China will use the successful launch of Shanghai's major demonstration project for flexible HVDC transmission and will continue to sum up experience to push forward the development of key technologies for flexible DC deepening research and application of results, striving for higher voltage levels, larger transmission capacity, and more. We will make new breakthroughs on the high-tech level and strive to achieve leapfrogging from technology to technology, and grasp the opportunities for development and initiative in future international competition.
“Twelfth Five-Year†Rural Power Network Reform Focused on Property Rights Issues On May 16, the State Development and Reform Commission of the State Council forwarded by the General Office of the State Council “Opinions on Implementing a New Round of Rural Power Grid Reconstruction and Upgrade Project†“Opinions†pointed out that during the “12th Five-Year Plan†period, the Rural power grids will generally be reconstructed, and rural residents' electricity consumption will be well protected. The problem of agricultural production and power supply will be basically solved. The “host management system†of county-level power supply enterprises will be completely abolished, and the urban and rural power grids will achieve the same goal of the same price, and the basic construction will be completed. The new rural power grid is safe, reliable, energy-saving, environmental-friendly, technologically advanced and standardized.
The "Opinions" clearly pointed out that during the "12th Five-Year Plan" period, it is necessary to deepen the rural power system reform, completely abolish the "host management system" of county-level power grid companies, follow the principle of establishing a modern enterprise system and the principles of fairness and voluntariness, and adopt free transfer, joint-stock reforms. In various forms, the establishment of an institutional mechanism conducive to promoting the healthy development of rural electricity. Local power grid enterprises must also deepen reforms and encourage cooperation with large grid companies through various forms of cooperation or integration to improve their power supply capabilities and service levels.
Comments:
The difficulty in the transformation of rural power grids lies in the fact that existing rural power management mechanisms have caused unclear property rights in rural power grids. Therefore, the most important issue in deepening rural power system reform during the “Twelfth Five-Year Plan†period is the issue of property rights ownership, right to use, ownership, and management rights. The division must be resolved in accordance with modern enterprise management mechanisms, promote the standardization and marketization of rural power companies, and gradually change the rigidity of management mechanisms. With the elimination of the escrow system, the grid company will become the main investor in the rural network transformation. Of course, there will still be some problems in the reform, such as the division of interests between the power grid company and the county government. However, the trend of reform is inevitable. The new round of rural power grid reform will gradually promote the development of rural economy. come out.
Huainan-Shanghai UHV Approved UHV Project Construction Speedup On September 28, Shu Yinji, deputy general manager of the State Grid Corporation of China, stated that the planning and construction of the Huainan-Shanghai UHV AC transmission line has been approved by the National Development and Reform Commission, which means that it has stagnated by nearly 2 The annual UHV AC approval work broke ice, and the UHV AC transmission project began to accelerate the pace of development.
The Notice on Printing Judgment Opinions on the Supplementary Feasible Study Report of the Pudong Electric Transmission to Huainan-Shanghai Power Transmission Project clearly stated that the Huainan-Shanghai Power Transmission and Distribution Project passes through Anhui, Zhejiang, and Shanghai, and the new Huainan, Weinan, Zhejiang and Shanghai Four substations (switching stations), the new 1000 kV line 2 x 656 kilometers, static total investment of 20.4 billion yuan. After the completion of the project, the two Huaibei coal-fired power bases will be able to add around 7.9 million kilowatts of external transmission capacity. According to reports, whether it is the length of the line, investment or transmission capacity, the UHV AC project in Huainan-Shanghai is more than double the scale of the Jinmen South-Jingmen demonstration project.
Prior to this, on May 24, the National Energy Administration clearly stated at the special dispatch conference of “Jiangdong Power Delivery†that it agreed to carry out the preliminary work of the Hami-Zhengzhou ±800 kV UHVDC outbound project. At the same time, the National Energy Administration sent a letter to the State Grid Corporation of China and agreed that Xiluodu's left-bank ± West Zhejiang ± 800 kV UHVDC power transmission project should carry out its preliminary work. In addition, significant advances have also been made in the preliminary work of the Xi’an-Nanjing 1000-kilovolt UHV AC transmission and transformation project.
Comments:
With the country's control of coal production, the increasing pressure on coal transportation, and the far-reaching impact of Japan's Fukushima nuclear accident on China's nuclear power development, coal shortages and power shortages in the eastern and central regions of China will persist for a long time to come. Under such circumstances, it is difficult to adapt to the requirements of energy development mode changes and economic and social development by overly relying on the energy allocation methods of coal transportation and the balanced power development methods on the ground. Therefore, supporting the development and application of UHV transmission technologies, accelerating the construction of trans-regional and inter-provincial power grids, and giving full play to the role of the grid in the allocation of energy resources are undoubtedly one of the important measures to alleviate the “electricity shortageâ€.
Xuejiadao, the world’s largest electric bus charging station, was put into operation July 11th. The world’s most versatile, largest and most capable electric bus charging and switching station—Qingdao Island’s electric vehicle replacement and storage The demonstration power station is put into operation. The power station is mainly a bus route passing through the Jiaozhou Bay Tunnel and some bus lines in Huangdao District. About 280 electric buses are provided for charging and replacing. The entire power station is composed of three parts, a bus charging station in Xuejiadao bus junction station, an adjacent Beizhuang transformer station, a centralized charging station, and a battery distribution station.
In terms of charging, the bus charging and switching station can charge 120 bus batteries at the same time, and the centralized charging station can charge 360 ​​passenger car batteries at the same time. Each time the bus is changed, the time for the battery pack is 6-8 minutes, and 540 vehicles can be replaced each day, which can meet the needs of 280 buses for charging and changing electricity, accounting for more than 50% of the total number of buses in Huangdao District. In the distribution function, the centralized charging station is equipped with a battery 1440 group that can meet the battery requirements of 10 distribution stations in Huangdao District.
Another highlight of the Xuejiadao Power Station is the power station's storage and discharge capabilities. According to reports, the current centralized charging station has achieved 55,968 kWh of electrical energy storage, with a maximum discharge power of 7,020 kilowatts. It can use the battery to store electric energy when the local power grid is fully charged. In peak times and emergency situations, it can in turn release electricity to the grid. Peak-valley regulation load can reach up to 10,520 kilowatts.
Comments:
The Xuejiadao charge-for-power station model may become the most effective model for the development of pure electric vehicles in China. If the model is promoted on a large scale, the same functions of peak load reduction and valley filling as those of pumped storage power stations can be realized in areas where there is no pumped-storage power station in the northern part of the northwest, and the grid will absorb new energy sources such as wind power and solar energy in the future. The stable and stable operation of the power grid is of great significance.
The Sino-Russian DC back-to-back network enters the commissioning and commissioning stage. On October 10, Sino-Russian energy back-to-back networking project between China and Russia entered the commissioning stage. This is currently planning and constructing China's power transmission and transformation project with the highest voltage rating and largest capacity purchased from abroad. It will set up a bridge for mutually beneficial energy cooperation between China and Russia. Sino-Russian electricity cooperation, especially the construction of Sino-Russian DC back-to-back connected transmission projects, has improved the transmission capacity of the power grid in northeastern China, especially Heilongjiang, and solved the problem of power transmission for large-scale electricity purchases from Russia’s Far East.
Another major highlight of the Sino-Russian DC back-to-back networking project is the localization of equipment. It is understood that the capacity of the 500 kV Sino-Russian DC Black River Back-to-Back Converter Station is 750 MW, and 6+1 converter transformers are installed. In the converter station project, the domestic results of domestic HVDC transmission technology have been fully applied, and complete design, engineering design, equipment manufacturing and on-site construction and commissioning have all been implemented independently. Liu Tienan, deputy director of the National Development and Reform Commission and director of the National Energy Administration, commented on the construction of the 500 kV Heihe converter station: “The localization rate of the main equipment is up to 100%, and domestic lines are used on all 500 kV AC lines in China and Russia. The protection of products, which also laid the foundation for domestic equipment to enter the Russian market."
Comments:
As a neighboring country, China and Russia are also major energy consumers and producers in the world. Therefore, energy cooperation plays a decisive role in bilateral relations. The Sino-Russian DC back-to-back networking project has enriched the content of China-Russia energy cooperation and has accumulated experience in cooperation. At the same time, Sino-Russian energy cooperation is more like a lever, and the new world of Sino-Russian cooperation is being picked up. The Sino-Russian DC Back-to-Back Networking Project will increase the energy efficiency of Russia’s Far East region, promote the establishment of Heilongjiang Province and strengthen the northeastern grid of “West Power Transmission to the East, North Power Transmission to the South†coordinated with the UHV, and expand the energy resources between China and Russia. Project cooperation, while strengthening the complementary advantages of China and Russia, will also greatly promote China-Russia border trade and local economic development.
The world’s first ±660 kV DC transmission project was put into operation on February 28. 4 million kilowatts of clean electricity from eastern Ningxia was imported into Shandong Power Grid through more than 1300 kilometers of Ningdong DC transmission line, indicating that the State Grid Corporation is another The important cross-regional grid DC transmission project—Ningdong—Shandong ±660 kV DC transmission project was completed and put into operation. The Ningdong DC transmission project is the world’s first ±660 kV voltage class HVDC transmission project. It is a key power grid construction project of the country’s “West-to-East Power Transmission†project and a landmark project of Shandong Province’s implementation of the strategy of “transmitting electricity into Luâ€. The important channel for the transmission of electricity from the Northwest Power Grid to the North China Power Grid.
The Ningdong DC transmission project was completed and put into operation, realizing the dream of sending hydropower from the upper reaches of the Yellow River in the northwest region and the thermal power in Ningdong directly to Shandong. The transmission capacity is equivalent to building seven new 600,000-kilowatt units in Shandong. With the Ningdong HVDC project completed and put into operation, it will better play the network function of the grid configuration energy resources, achieve optimal allocation of energy resources, promote the establishment of a scientific and rational comprehensive energy transportation system, ease the pressure on coal transportation, and save coal , reduce greenhouse gas emissions such as carbon dioxide.
Comments:
Ningdong DC power transmission project is the highest level of DC power transmission project with the highest level of new voltage in China. The completion of the project put into operation, enriched and improved China's DC transmission voltage standard sequence, to fill the gap of ±660 kV HVDC transmission, and achieved fruitful technical innovations, successfully solved the ±660 kV voltage level overvoltage and insulation coordination , electromagnetic environment and external insulation, complete set of DC system design, valve hall design and integration of different technical routes and other technical problems, for the first time independent realization of the new voltage level DC system independent design, independent research and development of the main equipment, independent sets, independent construction and independent debugging The operation has greatly improved the independent innovation capability and core competitiveness of the national equipment manufacturing industry.
After two years of hard work and acceptance of the first batch of rural network intelligent pilot projects, the State Grid Corporation of China has achieved a good harvest in the intelligent construction of rural power grids. On October 25th, the intelligent pilot project of Zhejiang Quzhou Rural Power Network passed the acceptance of the expert group of the State Grid Corporation of China. At this point, the first batch of three pilot projects of the rural network camping distribution management model were all checked and accepted.
The project was launched in January 2010 with a total investment of more than 80 million yuan, closely surrounding the overall goal of a strong smart grid development, based on the characteristics of rural power supply, researching and solving the basic key technical issues in the intelligentization of rural power grids, and organizing and developing rural smart distribution. The power grid pilots provide theoretical and practical basis for the large-scale advancement of the intelligentization of rural power grids. After two years of construction, key achievements such as smart distribution station equipment, unified data collection and centralized monitoring platforms for medium and low-voltage power grids, and wireless cellular communication networks have come out one after another. Some representative construction models have taken shape.
This year, the State Grid Corporation of China further expanded the scope of the optimization of the management mode of farm distribution and distribution, and listed Shandong Gaomi and Penglai, Anhui Feixi, Henan Fuyang and Mengjin, Liaoning Shenbei New District as pilot sites in 2011, and launched a comprehensive project in March. Construction. It is understood that the second batch of pilot projects is expected to be completed by the end of 2012. In the future, the State Grid Corporation of China will expand the coverage of key technologies such as intelligent distribution stations and agricultural distribution network automation, and combine the development mode of the State Grid Corporation of China to further strengthen research on key technologies, equipment and management models, and focus on the county's power communication network. Construction, and gradually establish a series of intelligent agricultural network standards.
Comments:
The smart grid will eventually reach the majority of rural areas in China. The new round of rural power grid upgrading and upgrading should be coordinated with the future smart grid construction and some forward-looking planning and design. The rural network intelligent pilot project has achieved good economic and social benefits in improving the power supply capacity, power supply reliability and power quality of the rural power grid, reducing power consumption of the low and medium-voltage power grids, optimizing resource allocation, and reducing management costs. The network intelligence construction mode has provided practical experience and has laid a good foundation for further expanding the scope of intelligent construction of rural power grids. It will guide rural areas to take the road of low-carbon and green development.
The world's highest voltage class smart substation was put into operation On March 1, Shaanxi State-owned 750 kV Yan'an Smart Substation located in Luochuan County, Yan'an City, Shaanxi Province was put into operation. It is understood that this is the highest voltage substation in the world. Yan'an substation was formally put into operation, marking a breakthrough in the pilot project of the State Grid Corporation's smart substation.
The 750 kV Yan'an Smart Substation employs advanced, reliable, integrated smart devices that integrate intelligent sensing, network communications, real-time monitoring and other technologies, collects panoramic data, applies advanced functions, and fully realizes substation measurement digitization from the main system to the auxiliary system. Control network, status visualization, operation program, and maintenance status, with unattended functions.
The Yanan substation has a high comprehensive technical content and has achieved a number of historic breakthroughs. Its smart station is equipped with ultra-high voltage electronic transformers, circuit breakers and transformers and other intelligent devices as the first in the world. It has set up a unified condition monitoring platform to realize the integration and remote application of large-scale, multi-parameter on-line monitoring back-end systems for ultra-high-voltage smart substations. For the first time, the station adopts a 750 kV transformer intelligent ventilation system that is conducive to energy conservation. For the first time, AC/DC integrated power supplies are used in 750 kV substations. For the first time, protection, metering and measurement and control devices based on the DL860 standard are fully applied in EHV substations.
Comments:
From the Beichuan 110 kV smart substation to the 220 kV Xiqiao smart substation, from the 500 kV Lanxi substation to the world's highest voltage class smart substation - the 750 kV Yanan substation, to the first domestic 500 in the "mirror" layout The KV smart substation—500-kV Changshu South Substation is put into operation. The pilot project of China’s smart substation has made new progress and has become the backbone of the world’s substation technology development. At the same time, the State Grid Corporation of China has also formulated 15 smart substation standards, forming the world's first series of technical standards for smart substations. Applied for 126 patents, and the overall technical level leads the world.
Among them, the “Power Sky Road†Qinghai-Tibet DC connected to build a trial run, marking the full interconnection of China's mainland power grid; power grid equipment, technology and other external cooperation continued to deepen, the national power grid not only successfully acquired and took over the operation of seven transmission concession companies in Brazil, but also with the United States The power company signed an agreement to jointly promote UHV, smart grid and new energy construction; in the field of UHV long-distance transmission, China has become the world leader; in the field of strong smart grid, the construction of intelligent substation and electric vehicle charging and charging network is deepening , will become the makers of world standards; in the future construction of Internet of things, China's power grid has taken the lead in ... ... whether it is planning layout, investment scale, or scientific and technological innovation level, China's power grid with its huge body gradually realize the curve overtaking, gradually Leading position in the world.
Power Sky Road On December 9, an energy major artery linking Qinghai and Tibet - the Qinghai-Tibet Power Grid interconnection project was completed and commissioned, ending the long-term isolated network operation history of Tibet Power Grid, indicating that China's mainland power grid is fully interconnected and realized the Beijing national The direct dispatching of Tibet Power by the Power Dispatching Center lays the foundation for a fundamental solution to Tibet’s urban and rural residents’ lives and industrial and agricultural production and power issues. Moreover, it solved the problems such as the weak structure of the Haixi power grid in Qinghai and the shortage of power supply, and met the rapidly growing demand for electricity in the Qaidam circular economy pilot area.
The Qinghai-Tibet DC interconnection project is the world’s highest transmission and power transformation project with the highest altitude, the largest construction scale in the coldest region, and the most difficult construction problems. The main project connects Golmud, Qinghai and Lhasa, Tibet, with a total length of 1,038 km. In addition to the HVDC transmission lines and the two ±400 kV converter stations, the 750-kilovolt power transmission project in Xining-Riyueshan-Haixi-Geermu and the 220kV power grid project in Tibet were also built.
Comments:
The Qinghai-Tibet Networking Project has the highest altitude along the route and the longest "two worlds" in the construction of permafrost areas. It is necessary to overcome the "diagnosis of high plateau physiology and health, extremely fragile plateau ecological environment, difficulty in the construction of permafrost bases in plateau alpine regions, and high altitude overvoltages. There are four major engineering problems, such as insulation coordination and difficulty in equipment development, etc. At the same time, Tibet Power Grid and the Northwest (Qinghai) Power Grid are interconnected through the Qinghai-Tibet Networking Project, which can transfer electricity to support Tibet during the dry season and send surplus power during the wet season. We will thoroughly optimize the electricity supply structure in Tibet and fundamentally solve the problem of electricity shortage in Tibet.According to relevant departments' calculation, after the opening of the Qinghai-Tibet network project, it is expected that during the "Twelfth Five-Year Plan" period, about 4 billion kilowatt-hours of electricity will be delivered to Tibet to save the standard coal. 1.36 million tons, reducing carbon emissions by 3.55 million tons.
The two major power grids identified the development goals of the “Twelfth Five-Year Planâ€, and the State Grid Corporation of China 2011 working conference that ended on January 9 revealed that during the “Twelfth Five-Year Plan†period, the State Grid Corporation of China planned to build “three verticals connecting large energy bases and major load centersâ€. Sanheng’s UHV backbone backbone and 13 HVDC transmission projects (of which 10 UHV DC projects) form a large-scale energy distribution pattern of “West Power Transmission to the East†and “Northern Power Transmission to the Southâ€. By 2015, the State Grid Corporation of China will have a line length of more than 1 million kilowatts and 110,000 kilowatt-hours of substation capacity, with an average annual increase of 8.4% and 12.5% ​​respectively; sales volume will reach 3.8 trillion kwh, compared to 2010. The annual growth rate is 42%; State Grid Corporation's cross-regional resource allocation capacity has reached 250 million kilowatts...
On January 19, the work conference of China Southern Power Grid Company in 2011 made it clear that the main task of China Southern Power Grid during the “12th Five-Year Plan†period was to highlight the need to ensure safe and reliable power supply and improve its ability to control the large power grid. For this reason, in the next five years, China Southern Power Grid will further increase the investment in power grid development, of which the investment in fixed assets will exceed 500 billion yuan. During the “12th Five-Year Plan†period, China Southern Power Grid Co., Ltd. will add 17.3 million kilowatts of West-to-East power transmission, and the total size of West-to-East power transmission in 2015 will reach 43 million kilowatts. In addition, China Southern Power Grid Corporation also stated that it supports the development of clean energy and new energy, and accelerates the solution of new energy, renewable energy, and distributed integrated energy supply systems to effectively access the grid.
Comments:
Transmission has been considered as the "sixth mode of transportation" after roads, railways, waterways, aviation, and pipeline transportation. It will bring strong vitality to the construction of modern energy transmission channels and build safe, stable, economic, and clean modern energy sources. The industrial system plays an important role. In this regard, the Twelfth Five-Year Plan for National Economic and Social Development of China clearly states: “To meet the requirements for the large-scale cross-regional transmission of electricity and new energy for grid connection, accelerate the construction of a modern power grid system, and further expand the scale of West-to-East power transmission. Improve the regional backbone network, develop high-capacity, high-efficiency, and long-distance advanced transmission technologies such as ultra-high voltage, rely on advanced technologies such as information, control, and energy storage to promote the construction of smart grids, strengthen the construction and transformation of urban and rural power grids, and strengthen the optimization of power grid configuration. Capability and power supply reliability."
The first flexible HVDC transmission project in Asia operation On July 25, the first flexible HVDC transmission demonstration project in Asia, Shanghai Nanhui Wind Farm Flexible HVDC Transmission Project was put into operation. The project is linked to Shanghai Nanhui Wind Farm and Shuru Converter Station, with a transmission capacity of 20 MW, a DC voltage level of ±30 kV and a transmission distance of 8.6 km. It is the first in China to have fully independent intellectual property rights and a world-class level of flexible DC. The transmission line is also another major innovation achieved by China in the field of high-power power electronics, marking the State Grid Corporation becoming the third company in the world following ABB and Siemens to master the flexible DC transmission technology.
Flexible DC transmission is the internationally recognized best technology solution for renewable energy grid integration such as wind farms. It uses a new generation of DC transmission technology based on voltage source converters to independently control the phase and amplitude of the output voltage. Flexibly adjust the output active and reactive power, with outstanding advantages such as flexible operation mode, strong controllability, multiple applicable occasions, small floor space, and good environmental protection, etc., and excellent wind farm connection performance and strong anti-interference The capability can effectively improve the low-voltage ride-through capability, meet the transient performance requirements of the grid-connected system, and has broad application prospects in the field of new energy grid-connected, isolated islands, and urban distribution networks. The development of wind energy and solar energy resources in China is highly concentrated and away from the load center. Flexible DC transmission technology, with its significant technical features and advantages, has a broad application prospect in the field of new energy integration in China.
Comments:
The successful commissioning of the flexible HVDC transmission demonstration project indicates that the State Grid Corporation of China has occupied the technological commanding heights in the field of high-power power electronics, laying a solid technical foundation for the large-scale and centralized development of wind farms in China, and promoting the energy sector in China. The development of green environmental protection is of positive significance. The State Grid Corporation of China will use the successful launch of Shanghai's major demonstration project for flexible HVDC transmission and will continue to sum up experience to push forward the development of key technologies for flexible DC deepening research and application of results, striving for higher voltage levels, larger transmission capacity, and more. We will make new breakthroughs on the high-tech level and strive to achieve leapfrogging from technology to technology, and grasp the opportunities for development and initiative in future international competition.
“Twelfth Five-Year†Rural Power Network Reform Focused on Property Rights Issues On May 16, the State Development and Reform Commission of the State Council forwarded by the General Office of the State Council “Opinions on Implementing a New Round of Rural Power Grid Reconstruction and Upgrade Project†“Opinions†pointed out that during the “12th Five-Year Plan†period, the Rural power grids will generally be reconstructed, and rural residents' electricity consumption will be well protected. The problem of agricultural production and power supply will be basically solved. The “host management system†of county-level power supply enterprises will be completely abolished, and the urban and rural power grids will achieve the same goal of the same price, and the basic construction will be completed. The new rural power grid is safe, reliable, energy-saving, environmental-friendly, technologically advanced and standardized.
The "Opinions" clearly pointed out that during the "12th Five-Year Plan" period, it is necessary to deepen the rural power system reform, completely abolish the "host management system" of county-level power grid companies, follow the principle of establishing a modern enterprise system and the principles of fairness and voluntariness, and adopt free transfer, joint-stock reforms. In various forms, the establishment of an institutional mechanism conducive to promoting the healthy development of rural electricity. Local power grid enterprises must also deepen reforms and encourage cooperation with large grid companies through various forms of cooperation or integration to improve their power supply capabilities and service levels.
Comments:
The difficulty in the transformation of rural power grids lies in the fact that existing rural power management mechanisms have caused unclear property rights in rural power grids. Therefore, the most important issue in deepening rural power system reform during the “Twelfth Five-Year Plan†period is the issue of property rights ownership, right to use, ownership, and management rights. The division must be resolved in accordance with modern enterprise management mechanisms, promote the standardization and marketization of rural power companies, and gradually change the rigidity of management mechanisms. With the elimination of the escrow system, the grid company will become the main investor in the rural network transformation. Of course, there will still be some problems in the reform, such as the division of interests between the power grid company and the county government. However, the trend of reform is inevitable. The new round of rural power grid reform will gradually promote the development of rural economy. come out.
Huainan-Shanghai UHV Approved UHV Project Construction Speedup On September 28, Shu Yinji, deputy general manager of the State Grid Corporation of China, stated that the planning and construction of the Huainan-Shanghai UHV AC transmission line has been approved by the National Development and Reform Commission, which means that it has stagnated by nearly 2 The annual UHV AC approval work broke ice, and the UHV AC transmission project began to accelerate the pace of development.
The Notice on Printing Judgment Opinions on the Supplementary Feasible Study Report of the Pudong Electric Transmission to Huainan-Shanghai Power Transmission Project clearly stated that the Huainan-Shanghai Power Transmission and Distribution Project passes through Anhui, Zhejiang, and Shanghai, and the new Huainan, Weinan, Zhejiang and Shanghai Four substations (switching stations), the new 1000 kV line 2 x 656 kilometers, static total investment of 20.4 billion yuan. After the completion of the project, the two Huaibei coal-fired power bases will be able to add around 7.9 million kilowatts of external transmission capacity. According to reports, whether it is the length of the line, investment or transmission capacity, the UHV AC project in Huainan-Shanghai is more than double the scale of the Jinmen South-Jingmen demonstration project.
Prior to this, on May 24, the National Energy Administration clearly stated at the special dispatch conference of “Jiangdong Power Delivery†that it agreed to carry out the preliminary work of the Hami-Zhengzhou ±800 kV UHVDC outbound project. At the same time, the National Energy Administration sent a letter to the State Grid Corporation of China and agreed that Xiluodu's left-bank ± West Zhejiang ± 800 kV UHVDC power transmission project should carry out its preliminary work. In addition, significant advances have also been made in the preliminary work of the Xi’an-Nanjing 1000-kilovolt UHV AC transmission and transformation project.
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With the country's control of coal production, the increasing pressure on coal transportation, and the far-reaching impact of Japan's Fukushima nuclear accident on China's nuclear power development, coal shortages and power shortages in the eastern and central regions of China will persist for a long time to come. Under such circumstances, it is difficult to adapt to the requirements of energy development mode changes and economic and social development by overly relying on the energy allocation methods of coal transportation and the balanced power development methods on the ground. Therefore, supporting the development and application of UHV transmission technologies, accelerating the construction of trans-regional and inter-provincial power grids, and giving full play to the role of the grid in the allocation of energy resources are undoubtedly one of the important measures to alleviate the “electricity shortageâ€.
Xuejiadao, the world’s largest electric bus charging station, was put into operation July 11th. The world’s most versatile, largest and most capable electric bus charging and switching station—Qingdao Island’s electric vehicle replacement and storage The demonstration power station is put into operation. The power station is mainly a bus route passing through the Jiaozhou Bay Tunnel and some bus lines in Huangdao District. About 280 electric buses are provided for charging and replacing. The entire power station is composed of three parts, a bus charging station in Xuejiadao bus junction station, an adjacent Beizhuang transformer station, a centralized charging station, and a battery distribution station.
In terms of charging, the bus charging and switching station can charge 120 bus batteries at the same time, and the centralized charging station can charge 360 ​​passenger car batteries at the same time. Each time the bus is changed, the time for the battery pack is 6-8 minutes, and 540 vehicles can be replaced each day, which can meet the needs of 280 buses for charging and changing electricity, accounting for more than 50% of the total number of buses in Huangdao District. In the distribution function, the centralized charging station is equipped with a battery 1440 group that can meet the battery requirements of 10 distribution stations in Huangdao District.
Another highlight of the Xuejiadao Power Station is the power station's storage and discharge capabilities. According to reports, the current centralized charging station has achieved 55,968 kWh of electrical energy storage, with a maximum discharge power of 7,020 kilowatts. It can use the battery to store electric energy when the local power grid is fully charged. In peak times and emergency situations, it can in turn release electricity to the grid. Peak-valley regulation load can reach up to 10,520 kilowatts.
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The Xuejiadao charge-for-power station model may become the most effective model for the development of pure electric vehicles in China. If the model is promoted on a large scale, the same functions of peak load reduction and valley filling as those of pumped storage power stations can be realized in areas where there is no pumped-storage power station in the northern part of the northwest, and the grid will absorb new energy sources such as wind power and solar energy in the future. The stable and stable operation of the power grid is of great significance.
The Sino-Russian DC back-to-back network enters the commissioning and commissioning stage. On October 10, Sino-Russian energy back-to-back networking project between China and Russia entered the commissioning stage. This is currently planning and constructing China's power transmission and transformation project with the highest voltage rating and largest capacity purchased from abroad. It will set up a bridge for mutually beneficial energy cooperation between China and Russia. Sino-Russian electricity cooperation, especially the construction of Sino-Russian DC back-to-back connected transmission projects, has improved the transmission capacity of the power grid in northeastern China, especially Heilongjiang, and solved the problem of power transmission for large-scale electricity purchases from Russia’s Far East.
Another major highlight of the Sino-Russian DC back-to-back networking project is the localization of equipment. It is understood that the capacity of the 500 kV Sino-Russian DC Black River Back-to-Back Converter Station is 750 MW, and 6+1 converter transformers are installed. In the converter station project, the domestic results of domestic HVDC transmission technology have been fully applied, and complete design, engineering design, equipment manufacturing and on-site construction and commissioning have all been implemented independently. Liu Tienan, deputy director of the National Development and Reform Commission and director of the National Energy Administration, commented on the construction of the 500 kV Heihe converter station: “The localization rate of the main equipment is up to 100%, and domestic lines are used on all 500 kV AC lines in China and Russia. The protection of products, which also laid the foundation for domestic equipment to enter the Russian market."
Comments:
As a neighboring country, China and Russia are also major energy consumers and producers in the world. Therefore, energy cooperation plays a decisive role in bilateral relations. The Sino-Russian DC back-to-back networking project has enriched the content of China-Russia energy cooperation and has accumulated experience in cooperation. At the same time, Sino-Russian energy cooperation is more like a lever, and the new world of Sino-Russian cooperation is being picked up. The Sino-Russian DC Back-to-Back Networking Project will increase the energy efficiency of Russia’s Far East region, promote the establishment of Heilongjiang Province and strengthen the northeastern grid of “West Power Transmission to the East, North Power Transmission to the South†coordinated with the UHV, and expand the energy resources between China and Russia. Project cooperation, while strengthening the complementary advantages of China and Russia, will also greatly promote China-Russia border trade and local economic development.
The world’s first ±660 kV DC transmission project was put into operation on February 28. 4 million kilowatts of clean electricity from eastern Ningxia was imported into Shandong Power Grid through more than 1300 kilometers of Ningdong DC transmission line, indicating that the State Grid Corporation is another The important cross-regional grid DC transmission project—Ningdong—Shandong ±660 kV DC transmission project was completed and put into operation. The Ningdong DC transmission project is the world’s first ±660 kV voltage class HVDC transmission project. It is a key power grid construction project of the country’s “West-to-East Power Transmission†project and a landmark project of Shandong Province’s implementation of the strategy of “transmitting electricity into Luâ€. The important channel for the transmission of electricity from the Northwest Power Grid to the North China Power Grid.
The Ningdong DC transmission project was completed and put into operation, realizing the dream of sending hydropower from the upper reaches of the Yellow River in the northwest region and the thermal power in Ningdong directly to Shandong. The transmission capacity is equivalent to building seven new 600,000-kilowatt units in Shandong. With the Ningdong HVDC project completed and put into operation, it will better play the network function of the grid configuration energy resources, achieve optimal allocation of energy resources, promote the establishment of a scientific and rational comprehensive energy transportation system, ease the pressure on coal transportation, and save coal , reduce greenhouse gas emissions such as carbon dioxide.
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Ningdong DC power transmission project is the highest level of DC power transmission project with the highest level of new voltage in China. The completion of the project put into operation, enriched and improved China's DC transmission voltage standard sequence, to fill the gap of ±660 kV HVDC transmission, and achieved fruitful technical innovations, successfully solved the ±660 kV voltage level overvoltage and insulation coordination , electromagnetic environment and external insulation, complete set of DC system design, valve hall design and integration of different technical routes and other technical problems, for the first time independent realization of the new voltage level DC system independent design, independent research and development of the main equipment, independent sets, independent construction and independent debugging The operation has greatly improved the independent innovation capability and core competitiveness of the national equipment manufacturing industry.
After two years of hard work and acceptance of the first batch of rural network intelligent pilot projects, the State Grid Corporation of China has achieved a good harvest in the intelligent construction of rural power grids. On October 25th, the intelligent pilot project of Zhejiang Quzhou Rural Power Network passed the acceptance of the expert group of the State Grid Corporation of China. At this point, the first batch of three pilot projects of the rural network camping distribution management model were all checked and accepted.
The project was launched in January 2010 with a total investment of more than 80 million yuan, closely surrounding the overall goal of a strong smart grid development, based on the characteristics of rural power supply, researching and solving the basic key technical issues in the intelligentization of rural power grids, and organizing and developing rural smart distribution. The power grid pilots provide theoretical and practical basis for the large-scale advancement of the intelligentization of rural power grids. After two years of construction, key achievements such as smart distribution station equipment, unified data collection and centralized monitoring platforms for medium and low-voltage power grids, and wireless cellular communication networks have come out one after another. Some representative construction models have taken shape.
This year, the State Grid Corporation of China further expanded the scope of the optimization of the management mode of farm distribution and distribution, and listed Shandong Gaomi and Penglai, Anhui Feixi, Henan Fuyang and Mengjin, Liaoning Shenbei New District as pilot sites in 2011, and launched a comprehensive project in March. Construction. It is understood that the second batch of pilot projects is expected to be completed by the end of 2012. In the future, the State Grid Corporation of China will expand the coverage of key technologies such as intelligent distribution stations and agricultural distribution network automation, and combine the development mode of the State Grid Corporation of China to further strengthen research on key technologies, equipment and management models, and focus on the county's power communication network. Construction, and gradually establish a series of intelligent agricultural network standards.
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The smart grid will eventually reach the majority of rural areas in China. The new round of rural power grid upgrading and upgrading should be coordinated with the future smart grid construction and some forward-looking planning and design. The rural network intelligent pilot project has achieved good economic and social benefits in improving the power supply capacity, power supply reliability and power quality of the rural power grid, reducing power consumption of the low and medium-voltage power grids, optimizing resource allocation, and reducing management costs. The network intelligence construction mode has provided practical experience and has laid a good foundation for further expanding the scope of intelligent construction of rural power grids. It will guide rural areas to take the road of low-carbon and green development.
The world's highest voltage class smart substation was put into operation On March 1, Shaanxi State-owned 750 kV Yan'an Smart Substation located in Luochuan County, Yan'an City, Shaanxi Province was put into operation. It is understood that this is the highest voltage substation in the world. Yan'an substation was formally put into operation, marking a breakthrough in the pilot project of the State Grid Corporation's smart substation.
The 750 kV Yan'an Smart Substation employs advanced, reliable, integrated smart devices that integrate intelligent sensing, network communications, real-time monitoring and other technologies, collects panoramic data, applies advanced functions, and fully realizes substation measurement digitization from the main system to the auxiliary system. Control network, status visualization, operation program, and maintenance status, with unattended functions.
The Yanan substation has a high comprehensive technical content and has achieved a number of historic breakthroughs. Its smart station is equipped with ultra-high voltage electronic transformers, circuit breakers and transformers and other intelligent devices as the first in the world. It has set up a unified condition monitoring platform to realize the integration and remote application of large-scale, multi-parameter on-line monitoring back-end systems for ultra-high-voltage smart substations. For the first time, the station adopts a 750 kV transformer intelligent ventilation system that is conducive to energy conservation. For the first time, AC/DC integrated power supplies are used in 750 kV substations. For the first time, protection, metering and measurement and control devices based on the DL860 standard are fully applied in EHV substations.
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From the Beichuan 110 kV smart substation to the 220 kV Xiqiao smart substation, from the 500 kV Lanxi substation to the world's highest voltage class smart substation - the 750 kV Yanan substation, to the first domestic 500 in the "mirror" layout The KV smart substation—500-kV Changshu South Substation is put into operation. The pilot project of China’s smart substation has made new progress and has become the backbone of the world’s substation technology development. At the same time, the State Grid Corporation of China has also formulated 15 smart substation standards, forming the world's first series of technical standards for smart substations. Applied for 126 patents, and the overall technical level leads the world.
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