Uplink and downlink overhead contact line equipment parallel state identification method of direct feeding traction network

Abstract

The invention discloses an uplink and downlink overhead contact line equipment parallel state identification method of a direct feeding traction network, wherein the method belongs to the field of electric railway power supplying technology. Through synchronously measuring a head-end voltage vector and a head-end current vector and a tail-end voltage vector of each segmented contact line of the traction network, a circuit equation is written and a current acquisition position x is solved. When the voltage above two ends of the segment of the direct feeding traction network is in a normal rangeabove 19kV, the formula is used for calculating the current acquisition position x. Through comparing each formula calculating result, a head-end or tail-end parallel condition of each segment of thedirect feeding traction network is determined in an online manner, and the head-end or tail-end parallel conditions comprises four conditions of 1, head-end and tail-end parallel connection; 2, head-end parallel connection and tail-end no parallel connection; 3, head-end no parallel connection and tail-end parallel connection; and 4, head-end and tail-end no parallel connection. The method has advantages of performing identification and early-warning on the operation condition of the direct feeding overhead contact line equipment, realizing real-time monitoring and feedback to the condition change of the traction network, and improving automation level and intelligence level in operation and management of the traction network. Furthermore the method has advantages of high versatility andeasy application.

Description

technical field [0001] The invention relates to the technical field of electric railway traction power supply. Background technique [0002] my country's railway construction has attracted worldwide attention and achieved remarkable results. As of 2017, the operating mileage of my country's railways has reached 127,000 km, of which the operating mileage of high-speed railways has increased to 25,000 km. High-speed railways generally use AT (Auto Transformer, autotransformer) power supply mode, but a large number of normal-speed railways and freight lines still use DT (direct power supply) mode, and the safety and good operation of traction power supply systems must be highly valued. [0003] The traction net has no backup and is exposed to nature. In addition, the pantograph-catenary contact at high speed will easily lead to various faults. In order to isolate the fault as much as possible, reduce the scope of the fault, and save the time for fault finding, the catenary can...

AI Technical Summary

Problems solved by technology

The first and last end of each catenary section may or may not be connected in parallel; due to abnormal equipment, the operating status may change, which is inconsistent with the required connection method

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