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A Fault Detection Method for Dual Sensor Redundancy of Hydrotron Governor Servotron

A fault detection, dual-sensor technology, applied in the fields of hydropower, machinery/engine, mechanical equipment, etc., can solve the problem of unable to detect the fault of the displacement sensor, and achieve the effect of reminding eye-catching and timely, ensuring accuracy, and preventing misjudgment

Active Publication Date: 2020-11-03
DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the above technical problems, the present invention proposes a double-sensor redundant fault detection method for the servomotor servomotor, which can effectively solve the problem that the servomotor displacement sensor slider connecting rod is broken or the cable is broken but the output signal is normal. , can not detect the problem of displacement sensor failure, and effectively prevent misjudgment of other types of failure

Method used

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  • A Fault Detection Method for Dual Sensor Redundancy of Hydrotron Governor Servotron
  • A Fault Detection Method for Dual Sensor Redundancy of Hydrotron Governor Servotron
  • A Fault Detection Method for Dual Sensor Redundancy of Hydrotron Governor Servotron

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Embodiment 1

[0032] As the basic embodiment of the present invention, with reference to the description attached figure 1, the present invention includes a dual-sensor redundant fault detection method for a hydroturbine governor servomotor, and uses a displacement sensor one and a displacement sensor two redundant mode to perform fault detection on the servomotor displacement sensor, and the fault detection specifically includes the following step:

[0033] a. Use displacement sensor 1 to measure the actual position Pos of the servomotor 1 , using displacement sensor 2 to measure the actual position Pos of the servomotor 2 ;

[0034] b. Measured main valve position reference MDV_Ref;

[0035] c. During the program cycle, the actual position of the servomotor Pos 1 and Pos 2 Differentiate separately to get the servomotor displacement change rate Pos_Rate 1 and Pos_Rate 2 ;

[0036] d. Pos_Rate of servomotor displacement change rate 1 and Pos_Rate 2 Differentiate to get the servomo...

Embodiment 2

[0040] As a preferred embodiment of the present invention, with reference to the attached figure 2 , the present invention includes a double-sensor redundant fault detection method for a hydraulic turbine governor servomotor, compared with embodiment 1, the steps of the detection method are the same as steps a, b, c and d in embodiment 1, and different The lies in step e:

[0041] Carry out fault judgment on displacement sensor 1 and displacement sensor 2. When the connecting rod of the slider of the magnetostrictive displacement sensor breaks, if the displacement sensor 2 is mainly used at this time, when the Pos_Rate is measured in real time 2 10%, and also detected |Pos_Rate 1 -Pos_Rate 2 |>3% / s, after the above state is maintained for 0.3s, it is judged that the second displacement sensor is faulty.

[0042] If measured|Pos_Rate 2 |1 -Pos_Rate 2 |>3% / s, and detect Pos_Acc at the same time 1 2 , after the above state is maintained for 0.3s, it is judged that the sec...

Embodiment 3

[0044] As the best implementation mode of the present invention, with reference to the attached figure 1 , manual attached figure 2 , manual attached image 3 with instructions attached Figure 4 , the present invention includes a dual-sensor redundant fault detection method for a hydraulic turbine governor servomotor. Fault detection can efficiently detect the fault of the displacement sensor when the connecting rod of the displacement sensor slider is broken or the cable is broken but the output signal is normal, and effectively prevents misjudgment of other fault types; the detection method includes the following steps :

[0045] a. Use displacement sensor 1 to measure the actual position Pos of the servomotor 1 , using displacement sensor 2 to measure the actual position Pos of the servomotor 2 ;

[0046] b. The main valve position reference MDV_Ref is measured, and the main valve position reference is the difference between the adjustment output and the displacemen...

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Abstract

The invention relates to the technical field of hydropower station water turbine governor control systems, in particular to a water turbine governor servomotor double-sensor redundancy type fault detection method. By measuring and calculating the displacement change rate, the displacement change rate difference, the displacement change accelerated speed and other related variable values of two displacement sensors, corresponding logical judgment is conducted, and accordingly, the fault situation of the redundant displacement sensor of a servomotor is obtained. Through the method, the problem that under the condition that a slide block connection rod or a stay wire of a servomotor displacement sensor is broken, but an output signal is normal, the fault of the displacement sensor cannot be detected out can be effectively solved, and misjudgment for other fault types is effectively prevented; and the reliability of a water turbine governor control system is greatly improved, and safe stable operation of a water-turbine generator set is ensured.

Description

technical field [0001] The invention relates to the technical field of a control system of a water turbine governor of a hydropower station, in particular to a dual-sensor redundant fault detection method for a servomotor of a water turbine governor. Background technique [0002] Hydropower is a kind of clean energy, renewable, pollution-free, low-cost, and good comprehensive economic benefits. It occupies an extremely important position in the history of my country's energy development. The turbine governor is a very important auxiliary control device in the process of hydropower generation. Its operation quality directly determines the safe and stable operation of the unit. The servomotor is one of the core components to control the speed of the turbine. For the measurement of the position of the servomotor, a magnetostrictive displacement sensor or a pull wire displacement sensor is generally used. At present, the fault detection of the displacement sensor is mainly base...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B15/00F03B11/00
CPCF03B11/008F03B15/00F05B2260/80Y02E10/20
Inventor 邬廷军郝河淞刘纪成张敏
Owner DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD
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