Method for realizing state monitoring and fault diagnosis of water turbine based on chaos theory

A chaos theory and turbine technology, applied in the fields of hydropower generation, mechanical equipment, engine components, etc., can solve the problem of difficulty in diagnosing cavitation faults of hydraulic turbines, and achieve the effect of improving safety, service life and system stability.

Active Publication Date: 2016-01-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to better understand the unstable characteristics of the internal flow field of the water turbine, and solve the problem that the cavitation fault of the water turbine is difficult to diagnose at present, and then provide a method based on chaos theory to realize the state monitoring and fault diagnosis of the water turbine

Method used

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  • Method for realizing state monitoring and fault diagnosis of water turbine based on chaos theory
  • Method for realizing state monitoring and fault diagnosis of water turbine based on chaos theory
  • Method for realizing state monitoring and fault diagnosis of water turbine based on chaos theory

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specific Embodiment approach 1

[0070] Specific implementation mode 1: Combination figure 1 , figure 2 To explain this embodiment, the method for realizing the state monitoring of a hydraulic turbine based on chaos theory in this embodiment uses a turbine state monitoring device including a pressure sensor 1, a signal amplifier 2, a data collector 3, and an upper computer 4; the pressure sensor 1 is set in In the draft tube area of ​​the hydraulic turbine, the signal output end of the pressure sensor 1 is connected to the signal input end of the signal amplifier 2, the signal output end of the signal amplifier 2 is connected to the signal input end of the data collector 3, and the signal output of the data collector 3 The terminal is connected with the signal input terminal of the host computer 4;

[0071] The specific steps of the method of realizing the state monitoring of the turbine based on the chaos theory are:

[0072] Step 1: Pressure sensor 1 monitors the turbine draft tube data;

[0073] Step 2: Obtain ...

specific Embodiment approach 2

[0084] Specific implementation manner two: combination image 3 This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that the pressure sensor 1 is arranged outside the draft tube elbow in step 1.

[0085] Such as image 3 As shown, in this embodiment, the pressure sensor 1 is set at the third draft 3 of the monitoring point. When the water flows out from the runner outlet, it will have a greater impact on the outer wall surface of the elbow. On the outside of the draft tube elbow, the lowest frequency pressure pulsation The amplitude of is the largest, and the characteristic phenomenon of cavitation is obvious.

specific Embodiment approach 3

[0086] Specific embodiment three: This embodiment is different from specific embodiments one or two in that the sampling frequency of the pressure pulsation signal in step two is 4000 Hz.

[0087] The pressure pulsation signal sampling frequency is set to 4000Hz to collect all the pressure pulsation data of the turbine, and it can avoid the interference of the cavitation phenomenon on the pressure sensor sampling results.

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Abstract

The invention discloses a method for realizing state monitoring and fault diagnosis of a water turbine based on a chaos theory, in particular, relates to a method for operating state monitoring and fault diagnosis of the water turbine, can preferably master the characteristic of instability of an internal flowing field of the water turbine, and solves the problem of difficult diagnosis of cavitation fault of a traditional water turbine. The method uses the promotion of wavelet transform for denoising pressure pulsation signals, and uses a chaos dynamics method for analyzing chaos dynamics characteristics of the water turbine in off-design operation so as to judge the caviation degree in the operation of the water turbine and to predict possible faults. The method is applied to the operation state monitoring and the fault diagnosis of the water turbine.

Description

Technical field [0001] The invention relates to a method for monitoring and fault diagnosis of a hydraulic turbine operating state, and belongs to the field of hydraulic turbine state monitoring and fault detection. Background technique [0002] During operation, the turbine will be harmed by cavitation and cavitation. As time goes by, the local surface of some flow-through components will change, from initially losing luster to gradually forming hole-like erosion, and finally developing into some Falling off or perforation of metal parts; when cavitation and cavitation develop to the extent of disrupting normal water flow, the energy loss of the turbine will increase sharply. [0003] Traditional overhauls are all post-event overhauls or scheduled overhauls. Post-event overhauls are overhauls performed after an accident, while planned overhauls are regular overhauls based on human experience or certain statistical rules. Turbine is an important power equipment. Once a failure occ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B11/00
CPCY02E10/20
Inventor 兰朝凤苏文涛李小斌赵昊阳李东阳李凤臣张梦
Owner HARBIN INST OF TECH
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