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
CN106569160AActive Publication Date: 2017-04-19ZHUZHOU CSR TIMES ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHUZHOU CSR TIMES ELECTRIC CO LTD
Publication Date
2017-04-19

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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.
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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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