Traction converter DC bus capacitor health assessment method and system

A technology of DC bus capacitors and traction converters, applied in capacitance measurement, instrumentation, measurement of electricity, etc., can solve the problem of low confidence in the health of capacitors, and achieve the effects of avoiding errors, accurate estimation, and simple circuits

Active Publication Date: 2021-01-15
NANJING HUASHI ELECTRONICS SCI
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Problems solved by technology

However, most of the current studies use the surface temperature as a reference, and there is an error between the surface temperature and the central temperature, so the confidence in the current assessment of capacitor health is not high

Method used

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  • Traction converter DC bus capacitor health assessment method and system
  • Traction converter DC bus capacitor health assessment method and system
  • Traction converter DC bus capacitor health assessment method and system

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0040] combine figure 1 , figure 2 Corresponding to the schematic diagram of the evaluation method and the diagram of the implementation method of the evaluation unit, the invention discloses a method for evaluating the health of the DC bus capacitor of a traction converter, including the following steps:

[0041] Step A), synchronous sampling to obtain the DC bus voltage v of the traction converter C (t), inverter module three-phase output current i U (t), i V (t), i W (t) and power switch tube T 1 , T 2 , T 3 The switch signal s 1 , s 2 , s 3 (turn on is 1, turn off is 0);

[0042] Step B), respectively according to the DC bus voltage v obtained in step A) C (t), inverter module three-phase output current i U (t), i V (t), i W (t) and power switch tube T 1 , T 2 , T 3 The switch signal s 1 , s 2 , s 3 Calculate the switching...

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Abstract

The invention discloses a traction converter direct-current bus capacitor health assessment method and system. The method comprises the steps of 1, carrying out synchronous sampling to obtain the direct-current bus voltage of a traction converter, the three-phase output current of an inverter module and a switching signal of a power switching tube; 2, respectively calculating ESR and C at the switching frequency of the DC bus capacitor and the output frequency of the inverter module according to the switching signal and the three-phase output current of the inverter module; 3, estimating the center temperature of the direct-current bus capacitor according to the surface temperature of the direct-current bus capacitor, the three-phase output current of the inverter module and the switchingsignal; and 4, assessing the health condition of the DC bus capacitor according to the ESR and C at the DC bus capacitor and the output frequency in combination with the central temperature. Accordingto the method provided by the invention, original sampling points in the traction converter can be utilized, ESR and C at two frequencies of the DC bus capacitor of the traction converter can be accurately monitored, and the health condition of the DC bus capacitor can be effectively assessed.

Description

technical field [0001] The invention relates to the field of on-line monitoring and reliability evaluation of power electronic components, in particular to a method and system for evaluating the health of a DC bus capacitor of a traction converter. Background technique [0002] With the improvement of power supply management standards for high-speed electrified railways and passenger dedicated lines, higher requirements are placed on the safety and reliability of power supply equipment. As far as the current electrical equipment management methods of China's electrified railways are concerned, it will cost a lot of operation to meet the standard requirements. maintenance costs. Therefore, necessary equipment monitoring measures must be taken to reduce the hidden dangers of power supply system accidents, reduce the probability of accidents, shorten the time for fault finding and maintenance, ensure the reliable operation of the power supply system, and play a role in reducing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08G01R27/26G01R31/00G01K13/00
CPCG01K13/00G01R27/08G01R27/2605G01R31/00
Inventor 陈爱林
Owner NANJING HUASHI ELECTRONICS SCI
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