Correctly face the gap
Distribution network is an important link connecting transmission grids, distributed power sources and various users, and is an important infrastructure for economic and social development. Since the "Eleventh Five-Year Plan" period, the State Grid Corporation of China has continued to increase the investment in the construction and transformation of distribution networks. The distribution network has made considerable progress and the scale and development quality of the power grid have been significantly improved. Compared with 2005, the distribution capacity and line length of the distribution network were doubled in 2012. The average annual outage time of city network customers was 5.2 hours (about 311 minutes), and the average outage time of rural network customers was 23.2 hours ( About 1393 minutes, respectively, reduced by 24% and 43% respectively, and the reliability of distribution network power supply has been significantly improved.
However, due to the large amount of historical debts and the weak foundation of distribution network development, the development of China's 10 kV medium voltage distribution network still lags behind. Compared with the distribution network of advanced countries in the world, the power grid structure, standardization construction level and distribution automation There is a large gap in the average level. At present, the average outage time of Japan's Tokyo Electric Power Company's operating area has been reduced to less than 10 minutes, and the French Distribution Network Company (ERDF) is about 70 minutes.
Improve leanness
In 2013, the company issued two technical standards, "Technical Guidelines for Distribution Network Planning and Design" (hereinafter referred to as "Guidelines") and "Depth Regulations for Planning Contents of Distribution Networks", aiming at improving the planning level of distribution networks.
The State Grid Corporation of China Development and Planning Department organizes the State Grid Beijing Economic and Technical Research Institute and other directly-affiliated units to guide the provincial power companies to carry out the rolling planning of the distribution network from 2013 to 2020, and to carry out "space load forecasting" and "substations" in areas where conditions permit. Optimize the layout and planning of power facilities, meet the needs of planning sites and access resources, and include them in local government land planning to ensure that the planning results fall down; carry out “research on target grids†to determine the structure of the long-distance target network, and guide Distribution network development.
The company always implements the reliability-centered distribution network planning concept, introduces quantitative reliability analysis methods, and scientifically formulates planning plans; implements a full-life-cycle management philosophy, and considers distribution network assets in the planning, design, reconstruction, operation, maintenance, and maintenance. Costs in the process, quantify, compare, and select planning options to achieve overall economic optimization of planning results.
Pursue standardized construction
After more than 10 years of construction and transformation, the “rejuvenation†of distribution network equipment has been significantly improved, and more than half of the equipment has been operating for less than 10 years. However, there are many types of 10KV equipment and the problem of low standards in some areas still exists. The technical level and quality of power grid equipment are still uneven. In addition, due to the unbalanced economic development, the grid structure and power supply reliability of the rural grid and the urban grid are greatly different. In 2012, the average outage time per household of the rural grid network was 4.5 times that of the city grid, and the interconnection ratio of the 10 kV line of the rural grid was only One-third of the city network.
The development of distribution network faces the features and problems of large number of projects, short construction period, rapid changes in external conditions, large regional development differences, and various equipment types. Standardization construction is an inevitable choice to improve the development quality of distribution networks.
According to the "Guidelines", the company first carried out the division of the power supply area in the rolling distribution network planning. The “Guidelines†divides the business area into six types of power supply areas such as A+, A, etc. according to the reliability requirements of power supply and the importance of load, and the load density. The division diagnoses problems in the distribution network and combines the achievements of advanced countries abroad. In A+ and A-type power supply areas, comparative analysis of power grid structure, equipment standards and operational index gaps; refinement of 6 power supply regional power grid development goals, construction priorities and construction standards, standardization of power grid structure, 10 kV line power supply radius, change (with ) Types of construction of electric and line facilities, major equipment parameters (such as transformer capacity sequence, conductor cross-section sequence), power supply and customer access methods, and organization of State Grid Research Institute to carry out research on “typical power supply model of distribution network†and actively promote Distribution network construction standardization work.
Developing key city demonstrations
The company has determined that it will fully build a "world-class" distribution network development strategy by 2020. In 2012, the Operation and Maintenance Department of the State Grid Corporation of China aimed at the international advanced level, with the goal of continuously improving the reliability of power supply and quality service, to carry out demonstration projects of urban distribution networks in the core areas of 10 key cities including Beijing, Shanghai and Xiamen. "Construction", pilot construction of "world-class" distribution network. Through optimization of the grid structure, advancing non-blackout operations and standard repairs, promoting state-of-service overhaul of distribution equipment, and accelerating distribution automation construction and application, the demonstration area has achieved 100% conversion and automatic distribution coverage of 10 kV grids. 100%, the customer's average failure outage time is reduced to 4.5 minutes.
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