Output voltage sensor fault diagnosing method of auxiliary current transformer and fault tolerance control method

A technology for assisting converters and sensor faults, applied in the direction of measuring current/voltage, measuring only voltage, instruments, etc., can solve the problems of difficult judgment and low accuracy of fault judgment, achieve low cost, fast and effective fault diagnosis, and improve accuracy Effect

Active Publication Date: 2017-04-19
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the output voltage sensor of the auxiliary converter on the locomotive, at present, it is only judged whether there is a fault by whether the voltage value (measured value) collected by the voltage sensor is within the normal range. Timely judge the fault condition

Method used

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  • Output voltage sensor fault diagnosing method of auxiliary current transformer and fault tolerance control method
  • Output voltage sensor fault diagnosing method of auxiliary current transformer and fault tolerance control method
  • Output voltage sensor fault diagnosing method of auxiliary current transformer and fault tolerance control method

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Embodiment 1

[0048] Such as figure 2 As shown, the method for diagnosing the fault of the output voltage sensor of the auxiliary converter in this embodiment, the steps include:

[0049] 1) Obtain in real time the three-phase output voltage measurement signals of the three target output voltage sensors connected to the locomotive auxiliary converter;

[0050] 2) According to the relationship between the three-phase output voltages of the auxiliary converter and the three-phase output voltage measurement signals obtained in step 1), diagnose whether there is a fault in the output voltage sensor, and locate the faulty sensor when a fault occurs.

[0051] For a three-phase system, the frequency and amplitude of the three line voltages are equal, the phases are different from each other by 120°, and the sum of the instantaneous values ​​of the three line voltages is zero. That is, the frequency and amplitude of the three-phase output voltages of the auxiliary converter in the locomotive are ...

Embodiment 2

[0105]This embodiment is basically the same as Embodiment 1, except that the specific steps for diagnosing whether there is a failure of the output voltage sensor are: calculating the mean value of the sum of the three-phase output voltage measurement values ​​at a specified time, and judging whether it is greater than the preset mean value threshold, If yes, diagnose that there is a faulty output voltage sensor. The average value of the sum of the values ​​of the three-phase output voltage measurement signals is specifically calculated according to formula (1). Based on the characteristic that the sum of the three-phase output voltages of the auxiliary converter is 0, combined with the change characteristics of the average value of the three-phase output voltage under normal and fault conditions, the fault state diagnosis can be realized through the average value exceeding the limit, and the implementation method Simpler than Example 1.

Embodiment 3

[0107] This embodiment is basically the same as Embodiment 1, the difference is that the specific steps for diagnosing whether there is a failure of the output voltage sensor are: calculating the variance between the sum of the three-phase output voltage measurement values ​​at a specified time relative to the nominal mean value, and judging Whether it is greater than the preset variance threshold, and if so, it is diagnosed that there is a failure of the output voltage sensor. The nominal mean value is the mean value of the sum of the three-phase output voltage measurement values ​​under normal working conditions, and the variance is specifically calculated according to formula (2). Based on the characteristics that the sum of the three-phase output voltages of the auxiliary converter is 0, combined with the variation characteristics of the variance of the sum of the three-phase output voltages under normal and fault conditions, the fault state diagnosis can be realized through...

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Abstract

The invention discloses an output voltage sensor fault diagnosing method of an auxiliary current transformer and a fault tolerance control method. The fault diagnosing method includes the steps of 1) real-time obtaining three-phase output voltage measuring signals of three target output voltage sensors connected with a motor-vehicle auxiliary current transformer; and 2) diagnosing the existence of failed output voltage sensors according to the relation between three-phase output voltage of the auxiliary current transformer and the three-phase output voltage measuring signals obtained in the step 1) and positioning the failed sensors when failure occurs. According to the fault tolerance control method, when sensor failure occurs, the voltage value of corresponding phases of the failed sensor is estimated according to the relations between three-phase output voltage and the sensor measuring signal estimated values under normal work conditions. The method is simple, and the required cost is low. Failure of output voltage sensor of the auxiliary current sensors can be timely diagnosed and the specific fault points can be positioned. The diagnosis precision and efficiency are high.

Description

technical field [0001] The invention relates to the technical field of electric locomotives, in particular to a fault diagnosis method and a fault-tolerant control method for an output voltage sensor of an auxiliary converter. Background technique [0002] In the locomotive converter, the auxiliary transformer output voltage sensor is used to detect the AC voltage output by the auxiliary converter, such as figure 1 As shown, when the auxiliary inverter is outputting, the switch KA is closed, the auxiliary inverter is started, and the DC voltage is converted into a three-phase AC voltage, which is transformed by the auxiliary transformer and then output; the auxiliary inverter is controlled by collecting auxiliary The VH4A, VH5A, and VH6A at the back end of the converter output the signal of the sensor and perform closed-loop control on the output voltage. As mentioned above, the quality of the output voltage sensors (VH4A, VH5A and VH6A) will directly affect the effective c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00G01R19/00
CPCG01R19/0084G01R35/00
Inventor 袁靖刘良杰徐绍龙李学明成正林蒋奉兵彭辉廖亮黄明明谭永光
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD
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