First-order high-pass filter system for high-order harmonics in traction substation

Abstract

The invention relates to a first-order high-pass filtering system for higher harmonic of a traction substation. By the first-order high-pass filtering system, the problem that an electric locomotive frequently stops on the way due to a higher harmonic overvoltage of a related circuit through the influence of the higher harmonic on an electrical system used by the traction substation is solved. The first-order high-pass filtering system is introduced to a power supply line of the traction substation by an input terminal in, a traction power supply line is connected with an input end of a first vacuum circuit breaker K1 through the terminal in, an output end of the first vacuum circuit breaker 1 is connected with an input end of a filter capacitor C, an output end of the filter capacitor C is connected to an input end of a first resistor R1 and is connected to an input end of a second vacuum circuit breaker K2, an output end of the second vacuum circuit breaker K2 is connected to an input end of a second resistor R2, and an output end of the first resistor R1 and an output end of the second resistor R2 are connected to a ground line end of the traction substation.

Description

Technical field: [0001] The invention relates to a 27.5kV electrified railway power supply system. Background technique: [0002] The harmonic problem is a problem that has existed since the birth of electrified railways. The frequency of harmonic currents generated by early AC and DC locomotives is relatively low, mainly the 3rd, 5th, 7th, 9th and other harmonic currents. The method of installing a single-tuned filter on the traction bus reduces the comprehensive voltage distortion rate at the 27.5kV incoming power supply to the allowable range. [0003] With the operation of AC-DC locomotives such as high-power locomotives and high-power locomotives, the manifestation of the harmonic problem has changed. As a nonlinear load, the odd-order harmonic current injected into the traction power supply system, from the third-order harmonic current Until more than 60 harmonic currents have content, the amplitude of low-order harmonic currents injected by AC-DC-AC locomotives into ...

AI Technical Summary

Problems solved by technology

[0006] 1. Cause damage to voltage-sensitive equipment, such as damage to lightning arresters, overvoltage tripping of compensation devices, overvoltage tripping of transformers used, failure of AC and DC screens, damage to electrical appliances in substations, etc.

[0007] 2. The locomotive is locked due to overvoltage during operation, causing the train to stop and affecting driving safety

At the same time, the high-order harmonic current will also interfere with the information in the transmission process

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