Control method of motor train unit rectifier based on two-step predictive current controller

Abstract

The invention discloses a control method of a motor train unit rectifier based on a two-step predictive current controller. The control method comprises the following steps that 1, a current prediction model of the motor train unit rectifier is constructed; 2, a current prediction model under an alpha-beta static orthogonal coordinate system is constructed; 3, two-step predictive time-delay compensation is conducted according to the current prediction models obtained in the step 1 and the step 2 to obtain two-step predictive current vectors; 4, two-step predictive values of currents under a d-q rotating coordinate system are obtained according to the current vectors obtained in the step 3; 5, the two-step predictive values, obtained in the step 4, of the currents are calculated by adopting a quality function to obtain quality function values, the minimum value in the quality function values is selected, a control voltage vector corresponding to the minimum quality function value is obtained, and a corresponding control impulse is directly output in the next sampling period. The control method has the advantages that the quick dynamic response characteristics and the harmonic suppression effect are high, total harmonic distortion is low, small current distortion is generated, and the dynamic response speed is high.

Description

technical field [0001] The invention relates to a control method for a rectifier of a train set, in particular to a control method for a rectifier of a train set based on a two-step predictive current controller. Background technique [0002] With the rapid development of electrified railways, the demand for "high speed" and "heavy load" puts forward more and more stringent requirements for electric locomotives; the new "AC-DC-AC" electric locomotives have high power factor, power It has been widely used in electrified railways due to its large traction force and other advantages; the grid-side rectifier control methods of traditional "AC-DC-AC" locomotives are mainly divided into two categories, indirect current control and DC current control; indirect current control and "Phase-amplitude control" as a representative, direct current control includes hysteresis current control, predictive current control and transient current control, etc.; transient direct current control i...

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Problems solved by technology

[0002] With the rapid development of electrified railways, the demand for "high speed" and "heavy load" has put forward more and more stringent requirements for electric locomotives; the new "AC-DC-AC" electric locomotive has high power factor, power It has been widely used in electrified railways due to its large traction force and other advantages; the grid-side rectifier control methods of traditional "AC-DC-AC" locomotives are mainly divided into two categories, indirect current control and DC current control; indirect current control and "Phase-amplitude control" as a representative, direct current control includes hysteresis current control, predictive current control and transient current control, etc.; transient direct current control is currently the control strategy used by electric locomotives and high-speed EMUs; in order to improve locomotive For the control performance of line-side pulse rectifiers, He Liqun et al. proposed an indirect current control method for locomotive four-quadrant converters, but this method is more suitable for low-frequency applications; Song Kejian et al. proposed a control method for locomotive converters that integrates the outer-loop multi-notch filter and the inner-loop tuned quasi-PR controller, which can suppress harmonics of a fixed order, but the suppression frequency band is discrete and the effect is limited; Ma Junpeng et al. Propose a model predictive direct power control method for single-phase three-level pulse rectifier, but the control object is also three-level rectifier; Fixed-order harmonics, but with similar limitations as the previous method

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