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Coasting over-voltage split-phase pulse blocking and pulse unblocking method for alternating-current transmission system

A pulse blocking, AC drive technology, applied in power lines, transportation and packaging, vehicle components, etc., can solve the problems of two-phase short circuit, burning out the traction network and pantograph, and high labor intensity, so as to improve performance and avoid problems. The effect of large fluctuations and avoiding bad impulses

Inactive Publication Date: 2012-07-11
SOUTHWEST JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

The labor intensity of the manual over-voltage splitting driver is high, and the driver must cut off the power when the phase is over-split. If the power is not cut off, the over-voltage splitting will cause overvoltage arcing between the traction network and the pantograph when entering the neutral section, and burn out Serious accidents such as traction network and pantograph, and even two-phase short circuit, this problem will become more prominent as the train running speed continues to increase

Method used

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  • Coasting over-voltage split-phase pulse blocking and pulse unblocking method for alternating-current transmission system
  • Coasting over-voltage split-phase pulse blocking and pulse unblocking method for alternating-current transmission system
  • Coasting over-voltage split-phase pulse blocking and pulse unblocking method for alternating-current transmission system

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Embodiment Construction

[0015] The implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0016] For trains that are coasting over-voltage phase separation, after the train control system receives the ground over-voltage phase separation and enters the electric phase separation warning signal and confirms the signal, the train will be degraded first, and the following control strategy will be adopted for the control system at the same time:

[0017] 1) For the attached Figure 4 The vector control system shown (ψ in the figure * , Respectively, flux and rotational speed given value, ψ, ω r are the actual values ​​of magnetic flux and rotational speed respectively, i sM i sT are the actual values ​​of magnetic flux and torque current respectively, u sM , u sT are the command values ​​of magnetic flux and torque voltage respectively, is the flux angle, u dc is the actual value of the intermediate DC voltage), the control system...

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Abstract

The invention discloses a coasting over-voltage split-phase pulse blocking and pulse unblocking method for an alternating-current transmission system. After the alternating-current transmission system receives electric split-phase entry signals and confirms the signals, a control system controls torque instruction voltage or reference torque of a traction converter to drop to zero according to a certain slope, and then blocking pulse instructions are sent out to block the traction converter. After pulse blocking is relieved by a train through electric phase splitting, the control system controls the torque instruction voltage or reference torque of the traction converter to rise to a calculation value of the control system, and then turns to normal operating conditions. Using the method can avoid defective impulses generated during blocking of the converter by the blocking pulses, avoid high fluctuation of intermediate direct-current voltage of the traction converter in pulse unblocking, and improve performance of a traction transmission system.

Description

technical field [0001] The invention relates to the control of electric locomotives or EMUs with AC transmission, in particular to the technical field of electric locomotives or EMUs idling and over-current phase separation control using AC transmission systems. Background technique [0002] There are many methods for electric locomotive (EMU) over-voltage phase separation. In the early days, the speed of trains was relatively slow, and manual over-power phase separation was usually used. There was a phase-separation sign in the phase-separation area to instruct the driver to operate over-power phase separation. Before reaching the neutral section, the driver first reduces the traction level to 0, disconnects the auxiliary system, and then disconnects the main circuit breaker on the primary side of the traction transformer, so that the locomotive passes through the neutral section without electricity. After the locomotive enters the power supply area of ​​the power supply ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60M3/04
Inventor 冯晓云熊成林宋文胜韩坤王青元
Owner SOUTHWEST JIAOTONG UNIV
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