Source-Net-Load: Science Controls Flexible Coordination

The development of power grids is currently undergoing significant changes: First, the proportion of intermittent renewable energy has increased year by year, the system's ability to balance has been weakened, and abandonment of light due to inadequate regulation capacity in some areas has become a serious problem; Second, with the development of social and economic power grid peaks The valley difference continues to increase; the third is the demand response, electric vehicles, energy storage and other flexible load ratio increases, adjustability increased, may become a new means of upgrading the power supply and demand balance. The change of source and load characteristics has brought new demands to the grid control technology, and it is not necessary to move from the traditional “generation tracking load” scheduling model to the “source-net-load” interactive scheduling model. However, in the interactive environment, the number of loads is large, the distribution is decentralized, and the two sides of the source and the load are more indefinite. How to grasp and control the interaction between the power supply, the grid, and the load at the level of power grid dispatching and control makes it more conducive to The safety and economy of the power grid is a problem that needs to be solved.

In order to solve the above problems, since 2011, the China Electric Power Research Institute has established the research direction of “source-net-load flexible interactive operation scheduling and control”, mainly by Yang Shengchun, Wang Hao, Li Yaping, Feng Shuhai, Zhao Liang, Li Feng, etc. The researchers' "source-net-load" interactive operation optimization dispatching and control team has gradually overcome the key technology of "source-network-charge" interactive regulation and control through years of efforts and formed a "source-network-charge" interactive operation. Analysis and control of the overall solution, the development of a series of related software and put into practical use. Recently, the "source-net-charge" interactive regulation system, key technologies and applications have won the China Power Technology Invention Award.

The project focuses on flexible load participation in regulation and operation, and systematically studies scientific and technical aspects, from interaction characteristics analysis, interaction modeling, quantitative assessment of interaction potential, interactive security operation analysis, energy balance, collaborative control, performance evaluation, etc. In the aspect, it has formed a complete interactive control technology system and achieved many original achievements, which have an important influence in the industry. During the project implementation, 19 invention patents were authorized and 41 papers were published (18 SCI papers, 18 EI journal papers, 2 IFAC papers, 3 PES GM papers), 5 software copyrights, and 1 monograph. During the project implementation, 19 invention patents were authorized and 41 papers were published (18 SCI papers, 18 EI journal papers, 2 IFAC papers, 3 PES GM papers), 5 software copyrights, and 1 monograph.

At present, the concept of "source-network-charge" interactive operation control has been incorporated into the national "Thirteenth Five-Year Plan" outline, which has effectively promoted the construction of the energy Internet. The inventions have been applied practically in provinces and cities such as Ningxia, Jiangsu, Zhejiang, Nanjing and Nantong. On February 16, 2017, the Chinese Society of Electrical Engineering organized an appraisal meeting for scientific and technological achievements of this project in Beijing. The appraisal committee unanimously believed that the project research results and key technologies were internationally initiated. The project achieved technological breakthroughs and innovations in the analysis, planning, and control of "source-network-charge" interactive operations:

Inventing the method of the flexible load participating in the power grid regulation and operation, it reveals the connotation of the "source-network-load" interactive operation control, and proposes a control system architecture supporting the "source-network-load" interaction as the "source-network-load" interaction. Operational analysis and control provide a total solution that significantly enhances the flexible adjustment capability of the power grid.

Invented a rapid quantitative assessment method for busbar flexible load aggregation response potential, combining top-down bus load separation and bottom-up single-type load response potential analysis to provide a rapid response to busbar load response potential Forecast and quantify assessment methods.

A continuous probability probabilistic power flow and continuity probabilistic static safety analysis method that takes into account the correlation of the response can reflect the uncertainty of the two sides of the source and the load and their mutual influence and the continuity of the interaction process, and solve the static safety of the power grid during the interaction process. problem.

Invented a flexible load stochastic optimization scheduling model which takes into account the safety constraints of the power grid. The decision-making capacity can cover multiple scenes of randomness of wind power output and uncertainty of load response, and solves the difficulty of programming scheduling plans under both uncertain conditions of the source and the load.

Invented a five-minute rolling optimization traction control strategy that takes into account the flexible load response, and solved the problem of massive flexible loads participating in the real-time control of grid distribution.

The invention results of the project have been applied in Ningxia Power Grid as a whole. The flexible load response capability of large industrial users, electric vehicle charging and replacement stations, and residential quarters can significantly reduce the amount of electricity discharged from Ningxia, and can delay the expansion of transmission and distribution equipment in Ningxia. And transformation. In addition, the research results have also been applied to the power grids in Jiangsu, Zhejiang, Nanjing, and Nantong, providing more comprehensive and rich information for system operation decisions. The practical application of the project results improves the ability of grid dispatchers to deal with the scheduling decisions and control under the two sides of the source and the load in an uncertain environment, which is conducive to upgrading new energy absorption capacity, increasing the thermal power plant load rate, reducing the peak-to-valley difference, and increasing the revenue of participating users. The three parties of the power supply, power grid and users can all benefit from it, with significant economic and social benefits, and broad prospects for popularization and application. At present, the concept of "source-network-charge" interactive operation control has been incorporated into the national "Thirteenth Five-Year Plan" outline, which has effectively promoted the construction of the energy Internet. The inventions have been applied practically in provinces and cities such as Ningxia, Jiangsu, Zhejiang, Nanjing and Nantong. On February 16, 2017, the Chinese Society of Electrical Engineering organized a scientific and technological achievement appraisal meeting for the project in Beijing. The appraisal committee unanimously believed that the project research results and key technologies were internationally initiated.

China Electric Power Research Institute, "source - network - Dutch" interactive operation of the optimal scheduling and control team of 24 people, including 4 doctoral degrees, 14 senior titles, 35 people under the age of 17 people. Since 2011, the team has continued to carry out special research on "source-network-charge" interactive operation control technology, and established a research system of "source-network-charge" flexible interactive operation control theory and technology, which is at the international advanced level in the field of interactive operation control. . In the past three years, the team has jointly undertaken one national key basic research and development plan (973 program), one national high-tech research and development plan (863 plan) project, one national science and technology support plan project, and national key R&D project 2 The project includes 1 item from the National Natural Science Foundation of China and the Youth Science Fund Project, 1 project from the Beijing Natural Science Foundation, 1 project from the Natural Science Foundation of Jiangsu Province, and more than 10 science and technology projects from the State Grid Corporation of China. He edited 3 books, published more than 100 academic papers, accepted over 50 authorized invention patents, and applied for 5 software copyrights.

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