Electric locomotive harmonic suppression method

Abstract

An electric locomotive harmonic suppression method comprises: performing direct current component separation of alternating current transmitted by a primary side of a traction transformer, and obtaining first direct current components and second direct current components of harmonic currents with the preset number of times of the alternating current; employing a PI regulator to generate a harmonicvoltage regulating variable according to the first direct component and the second direct current component of each harmonic current of the alternating current; performing overlapping of the harmonicvoltage regulating variable and an output fundamental wave voltage of a grid-side converter to obtain a target output voltage of the grid-side converter, and outputting a control instruction corresponding to the target output voltage to control the grid-side converter to generate a compensation current so as to offset harmonic currents included in the alternating current. Harmonic currents 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 harmonic suppression 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 investm

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