A method for detection and protection of low-frequency network voltage fluctuations in traction power supply systems
A traction power supply system, traction network technology, applied in the direction of automatic disconnection emergency protection device, frequency measurement device, measurement of current/voltage, etc., can solve problems such as large investment, avoid traction blockage and locomotive bowing, and save money The effect of investing in and maintaining the order of locomotives
Active Publication Date: 2019-01-08
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
However, these methods require a lot of investment, and they all belong to post-processing means. Therefore, when the traction power supply system is running normally, there is an urgent need for an effective protection measure that can detect low-frequency network voltage fluctuations and put in place. Stable operation is of great significance
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[0030] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. So that those skilled in the art can better understand the present invention.
[0031] figure 1 It is a flow chart of a specific embodiment of a traction power supply system detection and protection method of the present invention. In this example, if figure 1 As shown, the low-frequency network voltage fluctuation detection and protection method of the traction power supply system of the present invention includes:
[0032] Step 1: Detection of peak voltage in traction network
[0033] Since the low-frequency network voltage fluctuation of the traction network generally occurs when multiple locomotives are hoisting in the same power supply interval, the peak voltage at the receiving point of the locomotive is detected in real time during the hoisting of the electric locomotive. The voltage threshold was set at 40kV.
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The invention discloses a low-frequency network voltage fluctuation detection and protection method of a traction power supply system. The method comprises the following steps that: voltage peak detection of an electric locomotive pantograph rising power receiving point is carried out; if the peak exceeds a threshold, power receiving point voltage effective value detection is triggered; if the power receiving point voltage effective value exceeds a threshold, a data acquisition device carries out recording and a data processing apparatus carries out low-frequency network voltage fluctuation characteristic extraction and identification; and if a detection result shows low-frequency network voltage fluctuation, the data processing apparatus controls the locomotive to carry out mode switching according to a pantograph rising time sequence. Therefore, departure of prepared locomotives is managed and the influence on the voltage of the traction network by low-frequency network voltage fluctuation is eliminated.
Description
Technical field: [0001] The invention relates to the field of rail transit traction power supply system protection, in particular to the low-frequency network voltage fluctuation detection and protection technology of the traction power supply system. Background technique: [0002] In recent years, with the large number of AC-DC locomotives put into operation in China, low-frequency network voltage fluctuations of domestic electrified railways have occurred frequently, causing locomotive traction to be blocked and vehicles unable to leave the warehouse normally, seriously disturbing the transportation order. According to existing literature reports, domestic low-frequency network voltage fluctuations generally occur when multiple locomotives are hoisting in the same power supply area, and the oscillation frequency is 3-7 Hz. The main models involved include EMUs CRH1 and CRH5, electric locomotives HXD1B, HXD2B and HXD3B, etc. However, the low-frequency network voltage fluct...
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IPC IPC(8): H02H3/46G01R19/02G01R19/04G01R19/165G01R23/02
CPCG01R19/02G01R19/04G01R19/16538G01R19/16576G01R23/02H02H3/46
Inventor 胡海涛周毅何正友陶海东
Owner SOUTHWEST JIAOTONG UNIV