A low harmonic suppression method for four-quadrant converter device of electric locomotive

Abstract

The invention belongs to the field of control, and in particular relates to a control algorithm for suppressing low-order current harmonics of a four-quadrant converter, specifically a method for suppressing low harmonics of a four-quadrant converter for an electric locomotive. The harmonic suppression method in the four-quadrant control algorithm solves the problem of the influence of the low-order harmonics of the four-quadrant converter current on the control of the converter and the pollution of the power quality of the grid, and at the same time solves the problem of using a software filter Filter out the problem of the impact of low-order harmonics, and also solve the problem of low calculation accuracy of the fundamental wave phase angle and low-order harmonic phase angle of the grid network voltage signal, which has a certain impact on the dynamic performance of the four-quadrant control and the ability to suppress harmonics. problem of impact. This method mainly adds harmonic extraction and suppression functions to the control algorithm of the four-quadrant converter, has high adaptability and flexibility, and can achieve high-precision harmonic suppression.

Description

technical field [0001] The invention belongs to the field of control, in particular to a control algorithm for suppressing low-order current harmonics of a four-quadrant converter, in particular to a method for suppressing low-order harmonics of a four-quadrant converter for electric locomotives. Background technique [0002] Four-quadrant rectifiers are widely used in electric locomotives because of their high power factor and the ability to realize bidirectional flow of energy. Due to the low switching frequency of the four-quadrant rectifier, its AC side current usually has poor harmonic characteristics, which brings harmonic pollution to the power supply network, thereby affecting the power quality of the power supply network and the grid environment when other locomotives are running. [0003] In practical applications, four-quadrant converters usually use various methods to reduce the pollution caused by current harmonics. The main circuit topology of four-quadrant con...

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Problems solved by technology

[0006] The invention provides a harmonic suppression method integrated in the four-quadrant control algorithm, which solves the problem that the low-order harmonics of the current of the four-quadrant converter affect the control of the converter and pollute the power quality of the power grid, and at the same time It solves the problem of using the software filter method to filter out the influence of low-order harmonics, and also solves the problem of low calculation accuracy of the fundamental wave phase angle and low-order harmonic phase angle of the power grid network voltage signal, which causes the four-quadrant control dynamics Issues that have a certain impact on performance and harmonic rejection

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