ResearchResearch CenterEnergy and Transportation Integration Research Center

Research Center

Affiliated Institutes

01

Rail Transit Energy Internet Institute

Facing the major needs of carbon peaking & carbon neutrality of rail transit, the Institute proposes a new generation of flexible power supply equipment and system technology for rail transit, comprehensively solves the tough problems of the existing electrified railway and urban rail transit traction power supply system in aspects such as transport capacity improvement, external power supply optimization, energy saving & carbon reduction, and power quality, based on flexible AC-DC traction power supply technology of high-power power electronics, collaborative control and multi-energy integration, and conducts basic theoretical research, key technology R&D and demonstration application in orientations such as core equipment development, system analysis & cognition, planning & design, operation control, and breakdown prevention.

Core technology/products

Planning and design technology for flexible DC traction power supply system

• Apply the new intelligent power grid planning theory, having solved the difficulty of complicated load scenarios in the traction power supply system, and provide more accurate optimized planning and design for urban rail traction power supply system

• Focus on solving the problem of system topological time-varying caused by mobile impact locomotives and uncertain renewable energy, and the problem of form evolution of urban rail energy Internet under complex and massive operation scenarios, including the design of flexible DC traction power supply system framework and operation mode, the construction of highly efficient full operation scenarios of flexible DC traction power supply system, and the location & capacity determination of flexible DC traction power supply system

*R&D team: Rail Transit Energy Internet Institute

Rail transit energy Internet breakdown protection technology

System level protection technology

• According to the new operation mode and converter's features, having designed the system level protection as per the design principle of minimizing breakdown influence range and duration

• The new protection configuration remains basically unchanged from the traditional diode system or can be further simplified to maximize compatibility with the original DC protection

Figure: System protection device

Equipment level protection technology

• Having designed a bidirectional converter protection scheme for 26 typical internal breakdowns towards isolation transformer, starting resistor, converter AC side, DC bus bar, DC neutral bar, DC reactor rear bus bar and catenary areas, in order to achieve accurate breakdown identification and rapid isolation and ensure equipment safety

• Having developed the hardware and software of converter control & protection system with independent intellectual property rights in order to support the control & protection functions and performance realization of bidirectional converter

Figure: Bidirectional converter protection device

*R&D team: Rail Transit Energy Internet Institute

Large-capacity converter equipment technology

• Having proposed a bidirectional converter topology with wide operating range and high short-circuit tolerance, which can meet the application requirements of low voltage and high current in the flexible DC traction power supply grid

• Aiming at the working condition of Beijing Metro Line 13A, having developed a bidirectional converter with peak power up to 9MW

• Aiming at the core requirement of reducing IGBT junction temperature, having conducted water-cooled heat dissipation design of the bidirectional converter. The average temperature and temperature fluctuation level of the core parts IGBT are reduced by 10℃-15℃, which has significantly improved the operating life of IGBT

Figure: The appearance of the 9MW bidirectional converter developed by the team

*R&D team: Rail Transit Energy Internet Institute

咨询工作

Application Cases

• Demonstration project of full-through type and same-phase traction power supply system - Beijing Daxing International Airport Line

  Having reached a major sci-tech project cooperation with China Railway Electrification Engineering Group Co., Ltd. on Beijing Daxing International Airport Line, which will become domestically the first full-through type and same-phase traction power supply system after completion.

  

  Figure: static power converter valve tower developed by the team

  
  

  Figure: full-through type and same-phase control and protection system developed by the team

• Demonstration Project of flexible DC traction Power Supply System - Beijing Metro Line 13A, the first section of the railway from Tianjin central dist

  · Jointly undertake the project of Beijing Municipal Science & Technology Commission with Beijing Infrastructure Investment Co., Ltd., i.e. "Research on Key Technologies and Demonstration Application of Flexible DC traction Power Supply System for Urban Rail Transit". Beijing Metro Line 13A will become domestically the first urban rail flexible DC traction power supply system project with multiple cooperative control capabilities

  · Jointly conduct the flexible DC traction power supply demonstration project for the first section of the railway from Tianjin central districts to Jinghai District with Tianjin Rail Transit and other institutions. The project has been successfully applied for the demonstration project of China Association of Metros. After put into operation, it will become domestically the first urban rail traction power supply system project directly adopting photovoltaic power for traction load power supply