Introduction
Institute of Traction Power Supply (ITPS) in School of Electrical Engineering was established in 2008. Currently there are 13 staff, including 2 professors, 7 associate professors, 1 lecturer and 3 post-doctoral researchers. Among them, 12 staff have Ph.D. degree and 8 staff studied abroad or have oversea academic visiting experience more than 1 year. There are more than 60 students pursuing their Ph.D. and master degrees. ITPS has undertaken the teaching and personnel training tasks of corresponding courses on railway characteristic field of electrical engineering and its automation (rail traction electrification), built the laboratory of rail transit traction power supply, and developed the virtual-simulation experimental teaching project of design and operation for high-speed railway traction power supply system.
As the research group of rail transit traction power supply, ITPS participated in the construction of Electric Traction Engineering Research Center of the Ministry of Education and Collaborative Innovation Center for Rail Transit Safety (2011 proposal). In recent years, the research areas cover fundamental theories, key technologies and experimental platform of traction power supply system railway and urban rail transit. The research topics include comprehensive grounding of traction network, evaluation and optimization of electric matching of vehicle & network, 220 kV balanced traction transformer, resonance of vehicle network and power quality control, etc. While serving the development of China's rail transit, we have made a batch of research results and established a good academic reputation.
Research Areas
（1）Intelligent power supply technology for rail transit
Research on electromagnetic environment characteristics of rail transit traction power supply system and its impact on the service performance of key equipment, health management and intelligent operation and maintenance of traction power supply system based on Internet of Things, cloud computing, big data and artificial intelligence, and intelligent traction power supply equipment.
（2）New green flexible traction power supply system
Research on topologies and control methods of AC-DC-AC traction substation, access-type distributed renewable energy generation & storage device technology of power supply system, power flow control and energy management of flexible traction power supply system, the interaction and optimal control of "source-network-load-storage" of electrified railway.
（3）Ubiquitous power Internet of Things and active distribution network optimization technology
Research on the key technologies, such as new intelligent sensors, data collection and Internet of Things terminal fusion resource pool, active distribution network optimization theory based on the comprehensive coordination and optimization of "source-network-load-storage". Carry out simulation tests via experimental platform for ubiquitous power Internet of Things and active distribution network optimization.
（4）High voltage technology and new electrical materials
Research on electromagnetic transient mechanism, such as lightning overvoltage, resonant overvoltage, operation overvoltage in traction power supply system, and its measurement, evaluation and suppression technology, as well as the configuration and optimal control technology of high voltage electrical system on the roof of locomotives and vehicles. Study the basic theory of electrical insulation and the key issues in the design, manufacture and operation of equipment, focus on the development of high thermal conductive insulation materials, thermal conductive potting glue, electromagnetic shielding materials and other high-performance materials, and develop insulation testing and monitoring technology.
Representative Achievements
（1）Simulation software of rail transit traction power supply system
The power flow analysis program of traction power supply network developed by ITPS has been applied and popularized in the industry. The train power source model has been established, and the fast harmonic model based on the measured data has been put forward to support the research of harmonic transmission mechanism and the interaction effect between train and network.
（2）Vehicle network resonance treatment technology
In order to solve the operation safety problems caused by vehicle network mismatching, such as high-order harmonic resonance and low-frequency oscillation in high-speed railway system, a testing, evaluation and treatment technology system for vehicle network harmonic resonance was established.
（3）220 kV balanced traction transformer
In view of the large amount of negative sequence current in the ac traction power supply system of rail transit, which seriously affects the safe and stable operation of the power supply network, the research on power quality control technology is carried out systematically.
（4）Intelligent operation and maintenance technology
It has developed the intelligent operation and maintenance platform and implemented state perception and prediction to promote the in-depth development of intelligent operation and maintenance technology of traction power supply.
（5）Optimization of comprehensive grounding design for traction network
The comprehensive grounding technology scheme for high-speed railway full-parallel AT traction network is proposed, which optimizes the design of working grounding and protective grounding of EMU, as well as improving the electromagnetic compatibility performance of EMU. The achievements have been applied and popularized, forming a comprehensive grounding technology system of high-speed railway with independent intellectual property rights in China.
（6）High voltage technology and new electrical materials
Considering the high-voltage electric wires of Beijing-Zhangjiakou High-speed railway stretched across the railway, it has the risks of tower falling and wire breaking. To solve this problem, ITPS proposed the construction resistance strength and insulation safety of the protective shed tunnel with power line crossing the railway, saving 3 months of construction time to build new Beijing-Zhangjiakou line, and reducing the construction cost of 1.2161 billion CNY for the country.
