Intermediate voltage sensor fault diagnosis method under high-voltage working conditions of DC power supply transmission system

A sensor fault and transmission system technology, applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve the problems of inability to diagnose faults of intermediate voltage sensors, and can not be fully satisfied, and achieve a simple algorithm implementation, improve effectiveness and accuracy. Effect

Active Publication Date: 2018-11-02
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the voltage sensor fault diagnosis technology in the DC power supply transmission system is usually zero drift over-limit diagnosis under low voltage, and the middle voltage sensor fault cannot be diagnosed under high voltage conditions.
Even if it can realize the diagnosis under the high pressure condition, it cannot fully meet all the conditions in the high pressure condition

Method used

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  • Intermediate voltage sensor fault diagnosis method under high-voltage working conditions of DC power supply transmission system
  • Intermediate voltage sensor fault diagnosis method under high-voltage working conditions of DC power supply transmission system
  • Intermediate voltage sensor fault diagnosis method under high-voltage working conditions of DC power supply transmission system

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Embodiment

[0039] Such as figure 1 As shown, the DC power supply transmission system includes a power supply connected in sequence, a DC reactor L, a charging circuit, an intermediate circuit and a load; the charging circuit is used to charge the intermediate circuit, including a contactor and a charging resistor, wherein the contactor includes a charging contactor KM1 and the short-circuit contactor KM2, the charging contactor KM1 and the charging resistor Rchr are connected in parallel with the short-circuit contactor KM2 after being connected in series. In the figure, HSCB is a high-speed circuit breaker, Cd is a support capacitor, LH1 is a DC input current sensor, VH1 is a DC network voltage sensor, and VH2 is an intermediate voltage sensor to be diagnosed.

[0040] After starting up, when the charging contactor KM1 is closed, the system is in the high-voltage charging condition, and the system can be equivalent to a second-order RLC circuit, and the DC power supply charges the suppo...

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Abstract

The invention discloses an intermediate voltage sensor fault diagnosis method under high-voltage working conditions of a DC power supply transmission system. The intermediate voltage sensor fault diagnosis method comprises the steps of: S1, establishing relationship models among input current values, grid voltage values and intermediate DC voltage values under different working conditions when theDC power supply transmission system is in a normal state; S2, determining a current working condition of the DC power supply transmission system, and selecting the corresponding relationship model tocalculate an intermediate DC voltage model output value according to a determination result; S3, and comparing the intermediate DC voltage model output value obtained by means of the corresponding relationship model with an acquired intermediate voltage value, so as to determine a fault state of the intermediate voltage sensor. The intermediate voltage sensor fault diagnosis method realizes the effect of diagnosing the intermediate voltage sensor fault under various high-voltage working conditions, effectively improves the effectiveness and precision of sensor fault diagnosis, does not need to increase any hardware cost, and is simple to implement the algorithm.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis, and more specifically relates to a fault diagnosis method for an intermediate voltage sensor under high-voltage working conditions of a DC power supply transmission system. Background technique [0002] In DC power transmission systems such as urban rail subways, the intermediate voltage sensor is used to detect the DC voltage of the intermediate circuit. Its quality directly affects the effective control and fault protection of the transmission system, and has an important impact on the normal operation of the system. Therefore, if the fault state can be effectively diagnosed, the fault sensor is isolated according to the diagnosed fault information, and the effective intermediate voltage value is adopted after comprehensive judgment, the availability of the system can be greatly improved. At present, the voltage sensor fault diagnosis technology in the DC power supply transmission syste...

Claims

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Application Information

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IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 李学明刘良杰徐绍龙成正林谭永光廖亮彭辉袁靖黄明明蒋奉兵
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD
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