“Leading Charging of Electric Vehicles Affects Power Grids and Orderly Charging Research” at the International Leading

Leaded by the State Grid Beijing Electric Power Co., Ltd., the key technology of the national “863” plan for the smart grid jointly undertaken by the Chinese Academy of Electric Power (Priter High Voltage), the State Grid Energy Research Institute, the Institute of Electrical Engineering of the Chinese Academy of Sciences, the North China Electric Power University, and the Huazhong University of Science and Technology. The research and development (first phase) project, “Research on the Impact of Electric Vehicle Charging on Grids and Orderly Charging,” was initiated in January 2012 and lasted for three years. On March 27, 2015, it passed the technical acceptance of the Ministry of Science and Technology. According to reports, the research project consists of five parts, namely: research on charging requirements and load characteristics of electric vehicles; impact of large-scale electric vehicle charging on the power grid; research on orderly charging control strategies for large-scale electric vehicles; and orderly charging of electric vehicles. Development of control management system and construction of an orderly charging test system for electric vehicles.

The project results have been put into operation in the Beijing region for one year. The actual application shows that the use of an orderly charging technology can save the manual management costs of the charging and switching stations, reduce the increase in capacity of the power transformer at the upper level of the B/R station, and reduce the load on large-scale electric vehicles. The risk of adding peaks to the peaks has promoted the orderly development of electric vehicles in central cities and the safe and stable economic operation of power grids.

Project Background: Demand for Development of Emerging Industries

As a strategic emerging industry in China, electric vehicles are an important way to ensure the national energy security and realize the transformation of a low-carbon economy. Industry experts predict that with the continuous increase in research and development investment and breakthroughs in key technologies, China will enter the period of rapid development of electric vehicles in the future, and thus form a large-scale application of electric vehicles, which will bring new challenges to the development of power grid operations, specifically in The first is to trigger new load growth and further increase the peak-to-valley difference of the power grid; the second is to generate a large number of charging facility construction requirements, and put forward higher requirements for power grid upgrading and planning and construction; and third, charging requirements are characterized by randomness and dispersion. Increase the difficulty of distribution network operation and management.

Scientific and Technological Innovation: Established Orderly Charging Test System for the First Time

The “research on the influence of charging electric vehicles on the grid and orderly charging” mainly analyzed the charging demand and load characteristics of electric vehicles, studied the impact of charging of large-scale electric vehicles on the power grid, and put forward an orderly charging control strategy for large-scale electric vehicles. An orderly charging control management system for electric vehicles was developed, an orderly charging test system was built, and demonstration applications were conducted in Beijing. The system covers 21 charge and exchange stations located in eight districts including Beijing Haidian, Chaoyang, Shunyi and Tongzhou, including 9 electric taxi charging stations, 7 sanitation vehicle charging stations, 2 residential passenger car charging stations, and official vehicles. There are 2 charging stations and 1 electric bus charging station. The orderly charging test system has the functions of real-time charging data acquisition, data analysis, charging behavior guidance and management, etc., verifying the orderly charging behavior of various types of vehicles, and achieving a deviation of actual charging power from the system control target value is not greater than 10 %.

Expert Evaluation: International Leading Ordered Charging Practice

According to industry experts, orderly charging is an important technical means to solve the impact of large-scale electric vehicle charging on the power grid. It guides and coordinates charging behavior through the integrated application of smart grid technology and economic means, and achieves peak-shaving, valley-filling, and regional equalization purposes. Ultimately achieve a win-win situation for users and the grid to better support the development of electric vehicles. The research results of this project have provided strong technical support for improving the ability of the power grid to accept electric vehicles and promoting the rapid and healthy development of the electric vehicle industry. The research results have also been highly evaluated by the chairman of the World Electric Vehicle Association and the academician of the Asian Electric Vehicles, Professor Chen Qingquan: “The research results of the project have reached the international advanced level, and the orderly charging practice under the centralized charging mode has reached the international advanced level. ”

Organizational implementation: scientific and meticulous project research team

Throughout the research and development process of the entire project, State Grid Beijing Electric Power Company established a research team focused on subject cooperation, research, research, and collaboration in various fields, in accordance with the organizational approach of “unified organization, unified planning, and unified coordination”. The subject was held by the company's experts as the person in charge. During the research and development process, the task group disaggregated the task of the research, defined the research content, evaluation indicators, and fund allocation of each unit to ensure accurate and efficient research tasks for the subproject. At the same time, the quarterly regular meeting system was established. The project leader held quarterly task meetings to discuss the progress of the research, discuss key difficulties in the implementation of the project, and coordinate the work that needs to be coordinated among the various units. To ensure the overall progress of the project.

After fully understanding the research status of the project and drawing on advanced experience, the project leader led the team to conduct research on the development of electric vehicles in Shandong, Guangdong, and other regions with special features. At the same time, the members of the research team are encouraged to actively participate in domestic and international technical forums and academic conferences in the research field. To master the current research status and research trends in the field, exchange advanced experience, correct the research line in a timely manner, and ensure high-quality research projects. (Chi Zhongjun Zhang Baoqun Shi Rui)

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