Electric locomotive harmonic suppression method

Abstract

An electric locomotive harmonic suppression method comprises: performing direct current component separation of an alternating current transmitted by a primary side of a traction transformer, and respectively obtaining a first direct current component and a second direct current component of harmonic currents with the preset number of times of the alternating current; generating a harmonic voltageregulating variable with the preset number of times through combination of a preset current reference value according to the first direct current component and the second direct current component ofeach harmonic current of the alternating current; and performing overlapping of the harmonic voltage regulating variable with the preset number of times and an output fundamental wave voltage of a grid-side converter to combine a target output voltage of the grid-side converter, and generating a corresponding control instruction according to the target output voltage to control the grid-side converter to generate a compensation current. Harmonic currents (namely harmonic currents existed in the alternating current transmitted by the primary side of the traction transformer) in a high-voltage electric network are subjected to suppression at a secondary side of a traction transformer, and compared to a current electric locomotive harmonic suppression method, the electric locomotive harmonicsuppression method is more flexible in realization and is higher in reliability and safety.

Description

technical field [0001] The invention relates to the technical field of electric locomotives, in particular to a method for controlling harmonics of electric locomotives. Background technique [0002] In recent years, with the continuous acceleration of electrified railway construction, AC drive technology has become increasingly mature and widely used, so high-power AC drive locomotives are playing an increasingly important role in trunk line transportation. However, the mass application of high-power AC drive locomotives also brings some new power quality problems. [0003] The harmonic spectrum distribution of AC drive locomotive is wide. When the parameters of the traction power supply network meet certain conditions, the traction power supply network may amplify certain harmonics, and in some cases even vehicle-network resonance will occur. At the same time, high-order harmonics can also cause burning of the RC loop resistance of DC electric locomotives, explosion of ar...

AI Technical Summary

Problems solved by technology

On the one hand, the harmonic control device has a large capacity and a high voltage level, so the harmonic control device has high reliability requirements and a large volume

This also makes it difficult to select the device type of the harmonic control device, the system design is complicated, the floor area is large, and the one-time investment cost is high

On the other hand, the existing harmonic control devices are helpless for the harmonics generated between AC locomotives and between AC and DC locomotives in the same power supply area, and cannot avoid the harm caused by harmonics between locomotives, so it cannot fundamentally eliminate the Hidden dangers of network resonance

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