Impedance frequency characteristic measuring device of vehicle-mounted tractive power supply system and measuring method thereof

Abstract

The invention discloses an impedance frequency characteristic measuring device of a vehicle-mounted tractive power supply system and a measuring method thereof. The measuring device comprises a disturbance generating module and an impedance frequency characteristic acquisition module, wherein the disturbance generating module uses the on-off action of antiparallel switching elements IGBT to introduce the disturbance in the broadband (0-10000 Hz) to the tractive power supply system, and the antiparallel switching elements IGBT are the backup elements mutually, two antiparallel switching elements IGBT are operated during the normal operation, and while one IGBT exits the operation because of the failure, the system is still able to operate depending on the other IGBT; and the impedance frequency characteristic acquisition module is used for collecting voltage and current time domain information, receiving the real-time impedance frequency characteristic of the tractive power supply system by combining an impedance computing method, and displaying on a vehicle-mounted displayer in real time. The device is mounted on a train, and is capable of measuring the impedance frequency characteristic of the tractive power supply system, and analyzing the harmonic characteristic of the tractive power supply system and the harmonic resonance phenomenon better.

Description

technical field [0001] The invention relates to the field of measuring impedance frequency characteristics of traction power supply systems of electrified rail transit, in particular to a device for measuring impedance frequency characteristics of vehicle-mounted traction power supply systems and a measuring method thereof. Background technique [0002] The mileage of my country's high-speed railway has exceeded 22,000 kilometers, accounting for more than 60% of the world's total mileage. 3,961 trains are launched every day, and the power consumption is as high as 1.5% to 2% of the country's total. It is a major task to ensure the safe and stable operation of such a large-scale high-speed railway . Among them, the traction power supply system is the power source of high-speed railways, and good power supply quality is the primary prerequisite for ensuring the safe, reliable and efficient operation of tens of thousands of kilometers of high-speed railway networks and even thou...

AI Technical Summary

Problems solved by technology

However, the EMU load has the characteristics of rapid movement, violent fluctuations, nonlinearity, asymmetry, etc., and frequent high-power exchanges have also increased the unsafe factors of the traction power supply system and the EMU, especially in relatively harsh power supply environments (such as Network voltage fluctuations, high harmonic content, insufficient regional power grid capacity, etc.), will not only deteriorate the safe operation of the traction power supply system, but will also have a very adverse impact on the stability of the EMU control system

Since the high-speed railway was put into operation in 2007, there have been frequent reports of traction power supply system safety accidents caused by phenomena such as harmonic resonance and controller instability, which seriously threaten the development of electrified high-speed railways

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