Drag transmitting and transforming equipment

Abstract

The invention relates to a drawing transformer, which comprises: a three-phase transformer connected to the public electric network; one single-phase transformer connected to the railway drawing load; one three-phase rectify inverter, one direct-current energy storage device, and one single-phase rectify inverter are connected between three-phase transformer and single-phase transformer. Said device can output same phase at nearby transform stations of railway, without dividing phase; and the power of each transformer is stable, to form high-speed and high-load operation of machine.

Description

Technical field [0001] The invention relates to a locomotive traction power transmission and transformation 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, that is, every 20-25km along the railway line is regarded 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...

AI Technical Summary

Problems solved by technology

Although there is an automatic over-phase separation device, due to its high voltage and frequent switching actions, there are serious problems in its accuracy and reliability, and it cannot completely solve the adverse effects of electric separation on locomotive operation.

[0007] (2) High-speed and heavy-duty transportation all require large-capacity power supply. In order to meet the national standard for the power system to restrict the power quality of electrified railways, the reactive power compensation technology used in the original single-phase power supply mode has been changed. unable to adapt

If the adjustable symmetrical compensation technology is adopted in the traction substation, even if the AC-DC-AC power supply (regardless of its reactive power and harmonics) is used on the locomotive, the negative sequence is more prominent because of the larger capacity, technically and economically. Difficult to achieve the ideal state

[0008] (3) The high-speed railway to be built in my country may be a mixed operation mode of high and medium speeds. If there is a mixed use of locomotives with AC-DC-AC power supply and locomotives with AC-DC power supply, except for negative sequence, reactive power and harmonics will still remain Existence, power quality cannot be improved, and electrified railways face the problem of high electricity charges

[0009] (4) Energy crisis and environmental pollution are the top problems that plague the country's development

These energy sources are closely related to the weather and the environment, and their stability and adjustability are not as good as thermal power, nuclear power and other power plants. After they are converted into electric energy, there are technical problems in how to integrate them into the public grid and make rational use of them.

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