System and method for grid-side harmonic testing of CRH unit
A test system and EMU technology, applied in the field of testing, can solve the problems of low test accuracy, inability to detect the current of the whole train, and difficulty in detecting harmonic components, and achieve the effect of improving the detection accuracy
Active Publication Date: 2015-03-04
CRRC QINGDAO SIFANG CO LTD
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Problems solved by technology
[0003] The current on-board detection equipment and technology cannot effectively detect the current of the whole train. The current of the whole train can only be obtained by separately testing the grid side current of each power unit and then instantaneously superimposed and synthesized, and then obtain the harmonic component according to the current of the whole train.
[0004] However, the inventor found in the process of implementing the present invention that the current harmonic current detection method has low test accuracy, and it is difficult to detect harmonic components with a frequency above 3000 Hz
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[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0037] see figure 1 , figure 1 A schematic structural diagram of the EMU side harmonic test system provided for the embodiment of the present invention may include:
[0038] Some current sensors 11, some first type acquisition cards 12 and first controller 13; Wherein,
[0039] The current sensor 11 is in one-to-one correspondence with the power units on the EMU, that is, a current sensor collects the current of a power unit;
[0040] Optionally, the curren...
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The invention provides a system and a method for grid-side harmonic testing of a CRH unit. The method comprises the steps of: detecting the current of each power unit; sampling and quantizing the detected current and obtaining digital current signals of each power unit; superposing the digital current of each path to full-train current and acquiring harmonic components according to the full-train current, wherein a sampling frequency is determined according to the frequency of the to-be-detected harmonic components as well as the error of the target phase angle of the to-be-detected harmonic components. According to the system and the method for grid-side harmonic testing of the CRH unit, the detection precision of the harmonic current is improved and the harmonic component with the frequency of more than 3000Hz can be detected.
Description
technical field [0001] The invention relates to the technical field of testing, and more specifically, to a side harmonic testing system and method for a motor train network. Background technique [0002] EMUs generally adopt AC-DC-AC speed regulation, which will inevitably generate harmonics on the grid side. On the one hand, the harmonics may interfere with the surrounding communication equipment. On the other hand, the current flows back through the rails, which may affect the track circuit. Normal operation, at the same time, harmonics will also cause magnetic saturation of the traction transformer, increased loss, and increased heat. Therefore, it is necessary to grasp the harmonic distribution law and content of EMUs as accurately as possible. [0003] The current on-board detection equipment and technology cannot effectively detect the current of the whole train. The current of the whole train can only be obtained by separately testing the grid side current of each p...
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IPC IPC(8): G01R23/16G01R19/25
CPCG01R19/2513G01R23/20G01R23/16G01R19/0092
Inventor 余进邓小军刘韶庆徐跃于伟凯徐冠基贺竹林张博
Owner CRRC QINGDAO SIFANG CO LTD