Control method for single-phase three-level NPC rectifier of motor train unit based on super-twisting sliding mode

Abstract

The invention discloses a control method for a single-phase three-level NPC rectifier of a motor train unit based on a super-twisting sliding mode, and the method comprises the steps: deducing a single-phase three-level NPC rectifier mathematical model based on the d-q coordinate system through the introduction of d-q transformation of the three-phase rectifier into a single-phase system; improving the robustness of a locomotive traction system through a voltage outer loop control strategy based on sliding mode control; suppressing the jitter in a first-order system through super-twisting; anddesigning super-twisting inner ring current control. According to the invention, the advantages of strong invariance, fast response, anti-interference and the like of sliding mode control are utilized to design a voltage outer loop controller, thereby increasing the response speed of the system, reducing the fluctuation of the direct current side voltage, and improving the capacity of the systemfor adapting to load abrupt change. The current inner loop controller is designed through a super-twisting control algorithm in a high-order sliding mode, thereby guaranteeing the advantages of a traditional sliding mode, effectively solving the problem of buffeting of a system, improving the capability of tracking a grid-side voltage phase by input current, and eliminating the problems of buffeting in the input current and the like.

Description

technical field [0001] The invention relates to a control method for a single-phase three-level NPC rectifier of a train set, in particular to a control method for a single-phase three-level NPC rectifier of a train set based on a super-spiral sliding mode. Background technique [0002] The three-level PWM rectifier is an important part of the traction system of the high-speed railway EMU. In order to enhance the ability of the traction converter to adapt to sudden load changes, reduce the fluctuation of the DC side voltage and ensure the quality of the input current of the AC side, the control mode of the traction system rectifier Selection is critical. In the development of high-speed railways, although the structures of the traction systems of series EMUs are not the same, if analyzed from the perspective of equivalent circuits, the structures on the grid side can roughly be equivalent to multiple PWM rectifiers. The principles are connected in parallel to finally start ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new control method for railway power. The current inner loop controller is designed by using the super-helical control algorithm in the high-order sliding mode, which ensures the advantages of the traditional sliding mode and effectively solves the chattering of the system. problems, enhance the ability of the input current to track the voltage phase of the grid side, and eliminate the chattering phenomenon in the input current, etc.

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