The Working Group for the Energy Industry Standard Technical Specifications for Medium/High-Frequency Isolating Transformers in Flexible DC Systems (TC333/WG5-2024) was recently established, with its inaugural meeting successfully convened in Xi'an. Led by Tsinghua University and convened by Associate Professor Zhao Biao of the Department of Electrical Engineering, this standard represents the first energy industry standard for medium/high-frequency isolating transformers.
Hosted by the National Technical Committee for Standardization of HVDC Transmission Equipment (SAC/TC333), the meeting brought together 24 institutions including Tsinghua University, Xi'an High Voltage Apparatus Research Institute, China Electric Power Research Institute, CSG E-Power Science Academy, State Grid Economic and Technological Research Institute, CSG EHV Power Transmission Company, China Three Gorges Corporation, State Grid Jibei Electric Power Company, Shougang Zhixin, Beijing Huairou Laboratory, Guangdong Power Grid, Xi'an Jiaotong University, NR Electric, Baoding Tianwei Baobian Electric, Shandong Taikai, Xinhualu Special Electric, Hebei Gaojing Electric, CRRC Qihong Thermal Management, Shandong Power Equipment, Beijing Power Grid Interconnection DC Engineering, Fujian Electrical Equipment Testing Institute, Tangshan Amorphous Technology, Guangdong Fude Electronics, and Changzhou BR Power Technology.
Medium/high-frequency isolating transformers are core components enabling energy conversion and electrical isolation in power electronic transformers. Recent years have witnessed significant technological maturation of these transformers, with engineering applications in renewable energy integration and flexible distribution networks growing exponentially. However, the absence of dedicated standards has hindered coordinated high-quality development across product design, manufacturing, testing, and engineering applications, creating an urgent need for industry-wide consensus. The development of this standard holds critical importance for advancing the industrial progress of medium/high-frequency transformers and facilitating new power electronic systems under high-penetration renewable energy scenarios.
During the meeting, Xu Fanjiao, Senior Engineer and Secretary-General of the standardization technical committee, emphasized the standard's significance and outlined meeting objectives. Cui Bin from Tsinghua University's State Key Laboratory of Power System Operation and Control presented the draft standard's framework, prompting extensive discussions among experts on standard structure, terminology definitions, technical requirements, and testing protocols. These deliberations established a solid foundation for subsequent standardization work.
Notably, Tsinghua EE Department's DC Research Center has conducted systematic research on fundamental theories, core technologies, and critical equipment for medium/high-frequency isolating transformers. Through collaboration with domestic manufacturers, the team has developed serialized products successfully deployed in landmark projects including Ulanqab Source-Grid-Load-Storage Demonstration, Dongguan Songshan Lake Flexible Medium-Voltage Interconnection, and Qinghai Haixi Golmud DC Renewable Collection, accelerating both standardization progress and product evolution in this field.
