Motor train unit parallel auxiliary converter AC grounding fault detection method

A technology for auxiliary converters and ground detection, applied in the field of rail transit

Active Publication Date: 2020-12-18
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Solved the problem of real-time ground fault detection in the AC power supply system of parallel auxiliary converters, and improved the accuracy of ground fault detection in the AC power supply system of parallel auxiliary converters

Method used

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  • Motor train unit parallel auxiliary converter AC grounding fault detection method
  • Motor train unit parallel auxiliary converter AC grounding fault detection method
  • Motor train unit parallel auxiliary converter AC grounding fault detection method

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Embodiment Construction

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0046] figure 1 A schematic diagram of a method for detecting an AC ground fault of an EMU parallel auxiliary converter provided in an embodiment of the present invention, as shown in figure 1 As shown, the EMU parallel auxiliary converter AC ground fault detection method of the embodiment of the present invention includes the following steps:

[0047] S1, each auxiliary converter obtains the number of auxiliary converters connected in parallel online from the control network of the EMU, and generates a first total number n.

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Abstract

The embodiment of the invention relates to a motor train unit parallel auxiliary converter AC grounding fault detection method. The method comprises the steps of acquiring the first total number n ofonline parallel auxiliary converters; calculating the maximum grounding detection voltage of the system according to the first total number n and the maximum grounding current of the system; obtainingfirst voltage data of a grounding detection resistor by using a grounding detection circuit; performing bus grounding fault detection processing according to the first voltage data and the system maximum grounding detection voltage to generate first detection data; when the first detection data is AC bus grounding fault information, reporting the first detection data, and performing internal grounding fault detection processing to generate second detection data during next restart; and when the second detection data is the internal grounding fault information, reporting the second detection data, and performing self-locking processing. According to the embodiment of the invention, the real-time ground fault detection problem of the parallel auxiliary converter AC power supply system is solved, and the ground fault detection accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a method for detecting an AC grounding fault of a parallel auxiliary converter of an EMU. Background technique [0002] The auxiliary converter is an important operating equipment of the EMU. Its main task is to invert the intermediate voltage after four-quadrant rectification of the traction converter into three-phase AC power supply for all three-phase AC loads of the vehicle. The stable and reliable operation of the auxiliary converter AC power supply system is the prerequisite for the stable operation of the train traction drive system and the auxiliary power supply system, and it is also directly related to the safe operation of the entire train. During the operation of the train, due to lightning strikes, cable insulation damage, metal objects falling from cables or components, and AC load equipment failures, etc., the ground fault of the AC side of the auxiliary conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/52G01R31/56H02H7/12
CPCG01R31/52G01R31/56H02H7/12
Inventor 张波赵俊博黎梅云孙庆文何欣宇赵晨明王珅李洪国冯祥
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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