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A high-power thyristor turn-off characteristic test device based on half-wave method

A technology for characteristic testing and thyristors, which is applied in the field of high-power thyristor turn-off characteristic testing devices, can solve problems such as unsatisfactory equivalence, and achieve the effects of large selection, improved charging efficiency, and wide application range

Active Publication Date: 2016-01-20
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

At present, thyristor manufacturers' research on the turn-off characteristics of converter valves is limited to measuring the reverse recovery charge of thyristors. Although it can reflect the characteristics of thyristors, its equivalent is not ideal.

Method used

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  • A high-power thyristor turn-off characteristic test device based on half-wave method
  • A high-power thyristor turn-off characteristic test device based on half-wave method

Examples

Experimental program
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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] The invention adopts a variable-frequency high-voltage constant-current source to charge a fixed capacitor, and after the voltage of the fixed capacitor is charged to a certain value, the variable-frequency high-voltage constant-current source is disconnected, and a test thyristor is triggered at the same time. The commutation reactance is equivalent by testing the tapped reactor L2 in the main circuit unit, and the di / dt value of the thyristor current zero crossing is changed by changing the value of the tapped reactor L2. The fixed capacitor is discharged through the tapped reactor L2 to provide a sinusoidal half-wave current for the thyristor to be turned on, and to provide a back pressure after the thyristor current crosses zero. The heating loop unit realizes the shutdown characteristics at different junction temperatures. The test device has a f...

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Abstract

The invention provides a high-power thyristor turn-off characteristic test device based on the half-wave method. The device comprises a variable frequency high-voltage constant-current source G, a test master circuit unit, a heating circuit unit and a protective circuit unit. The variable frequency high-voltage constant-current source G, the test master circuit unit, the heating circuit unit and the protective circuit unit are parallelly connected to two ends of a test thyristor. The device is flexible in structure and simple for parameter adjustment (only the parameters such as inductance and voltage need to be adjusted), many test manners are provided, and the requirement for testing the turn-off characteristic of the high-power thyristor can be met.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a high-power thyristor turn-off characteristic testing device based on a half-wave method. Background technique [0002] The improvement of thyristor capacity has extended its application to the field of power transmission. At present, the high-voltage direct current transmission technology based on high-voltage series thyristors is developing rapidly around the world, especially in my country, where it has been applied on a large scale, and has played a good technical advantage in long-distance power transmission and large-scale grid interconnection, and has achieved great success. Good economic benefits. With the increase of DC transmission voltage and transmission capacity, the operation reliability of the DC converter valve, the key equipment of the DC transmission system, is crucial to the safe operation of the system, and the shut-off characteristics o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/26G01R31/327
Inventor 陈争光王高勇雷小舟
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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