Current low-order harmonic suppression method for four-quadrant converter of electric locomotive

Abstract

The invention belongs to the field of control, in particular to a current harmonic suppression control algorithm of a four-quadrant converter, and particularly relates to a current low-order harmonicsuppression method for a four-quadrant converter of an electric locomotive. The method is a harmonic suppression method fused in a four-quadrant control algorithm, solves the problems of influence ofcurrent low-order harmonics of the four-quadrant converter on the control of the converter and pollution to the electric energy quality of a power grid, and solves the problem of influence caused by filtering the low-order harmonics by adopting a software filter method. According to the method, a harmonic extraction and suppression function is added to the four-quadrant converter control algorithm, no extra hardware control circuit or device is added, so the method has high adaptability and flexibility, the purpose of harmonic suppression can be achieved, and meanwhile the design cost is reduced.

Description

technical field [0001] The invention belongs to the field of control, and in particular relates to a control algorithm for current harmonic suppression of a four-quadrant converter, in particular to a current low-order harmonic suppression method for a four-quadrant converter of an electric locomotive. 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-quadra...

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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 of the influence of the low-order harmonics of the current of the four-quadrant converter on the control of the converter and the pollution of the power quality of the grid , and solve the problem of using software filter to filter out the influence of low-order harmonics

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