YNd11 connection transformer based AC electrified railway traction cophase supply device

Abstract

The invention discloses a cophase traction powering device of AC electrified railway based on the YND11 wiring transformer; wherein, the traction transformer of the device is YNd11-connected three-phase transformer (T1). The YN-connected three primary sides, namely A, B and C phases of the transformer (T1) are connected with the common grid system. Three power flow controllers (IC) are arranged between the three d-connected terminals (a, b, c) at low-pressure side of the transformer, and terminal a and terminal b are connected with the electrified railway contacting network (TR). The invention has the advantages that: cophase power supply for the complete railway tracks without split phase can be realized; the voltage of the power supply is stable which ensures that locomotives run with high speed and heavy load; meanwhile, the negative sequence influence, no idle work influence and harmonic wave influence of railway traction load on the common grid system can be eliminated; the invention also has the advantages of low cost and convenient implementation.

Description

technical field [0001] The invention relates to an AC electrified railway traction in-phase power supply device. Background technique [0002] The single-phase system has the advantages of simple structure, low construction cost, convenient operation and maintenance, etc., which determines that single-phase power frequency AC power is generally used to power railway locomotives in electrified railways. The power system hopes that all loads will use the three-phase symmetrical fundamental current from the power grid to make full use of the capacity of equipment and lines and reduce the harm of reactive current and harmonic current to the system. In order to meet this requirement, the electrified railway adopts the scheme of phase sequence rotation and phase-by-phase power supply. Every 20-25km along the railway line is used as a power supply section, and each section is powered by different phases in the power grid in turn. A phase separation section of about 30m is set, and...

AI Technical Summary

Problems solved by technology

[0008] The high-speed railway to be built in my country may be a mixed operation mode of high and medium speeds. If AC-DC-AC power supply locomotives and AC-DC power supply locomotives are mixed, except for negative sequence, reactive power and harmonics still exist, and electric energy The quality cannot be improved, which restricts the development of both railways and electric power

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