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dfig Impeller Unbalanced Fault Diagnosis Method Based on Current Signal Coordinate Transformation

A technology of coordinate transformation and current signal, which is applied in the direction of measuring electricity, measuring electric variables, and testing motor generators. It can solve problems such as low reliability and high cost, and achieve the effect of easy implementation and good application prospects.

Active Publication Date: 2022-07-15
杨东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the DFIG impeller unbalance fault diagnosis method based on current signal coordinate conversion provided by the present invention solves the problems of high cost and low reliability in the traditional fault diagnosis method

Method used

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  • dfig Impeller Unbalanced Fault Diagnosis Method Based on Current Signal Coordinate Transformation
  • dfig Impeller Unbalanced Fault Diagnosis Method Based on Current Signal Coordinate Transformation
  • dfig Impeller Unbalanced Fault Diagnosis Method Based on Current Signal Coordinate Transformation

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Effect test

Embodiment 1

[0041] like figure 1 As shown, the DFIG impeller unbalance fault diagnosis method based on current signal coordinate transformation includes the following steps:

[0042] S1. Collect the three-phase current i(t) of the DFIG stator;

[0043] S2. Perform abc-dq coordinate transformation on the collected stator three-phase current i(t) to obtain the current component i of the three-phase current i(t) in the d-axis direction d (t);

[0044] S3, using the current component i d (t) Calculate only the eigenfrequency f m The fault characteristic information i of d0 (t);

[0045] where f m =ω m / 2π, ω m is the angular velocity of the impeller movement;

[0046] S4. Use FFT to analyze the fault characteristic information i d0 (t) Perform spectrum analysis to extract the characteristic frequency f m Amplitude at ;

[0047] S5. Compare the extracted amplitude with the amplitude at the characteristic frequency under the same working condition under normal conditions, and then d...

Embodiment 2

[0063] In this example, under the condition of DFIG impeller unbalanced fault operation, the influence of the impeller unbalanced given stator current is analyzed:

[0064] When the impeller is unbalanced, the shaft torque output by the fan can be expressed as:

[0065] The shaft torque T output by the fan can be expressed as:

[0066] T=T 0 +T v sin(ω m t) (4)

[0067] In the formula: t is time; T 0 is the aerodynamic torque generated by the fan; T v is the magnitude of torque ripple caused by unbalanced faults, ω m is the fan speed.

[0068] The DFIG is equivalent to a single-mass model, and its equation of motion is:

[0069]

[0070] In the formula: H M is the equivalent inertia time constant; T e is the electromagnetic torque; D M The damping coefficient is negligible.

[0071] According to equations (4) and (5), it can be seen that under the condition of unbalanced impeller and stable operation, T e can be expressed as:

[0072] T e =T e0 +T ev sin(...

Embodiment 3

[0082] The following is a simulation of the actual operating environment of the fan, and a wind speed model with a turbulence intensity of 3% and an average wind speed of 10m / s is constructed, such as figure 2 shown.

[0083] In order to quantitatively express the degree of impeller unbalance failure, the impeller unbalance factor F is defined as:

[0084] F=T v / T 0 (10)

[0085] Under the above-mentioned turbulent wind speed environment, the DFIG under two conditions of normal impeller F=0% and F=6% under impeller failure are simulated and studied respectively.

[0086] image 3 is the fault characteristic current i under the normal operation of the impeller and the unbalanced fault d0 (t) time domain signal; Figure 4 is the fault characteristic current i under the normal operation of the impeller and the unbalanced fault d0 (t) spectrogram; Figure 5 , 6 are the time domain signals of the stator A-phase current under the normal operation of the impeller and the ...

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Abstract

The invention discloses a DFIG impeller unbalance fault diagnosis method based on current signal coordinate transformation, comprising: S1, collecting the three-phase current i(t) of the DFIG stator; S2, performing abc-dq coordinates on the collected i(t) Transform to get the component i of the three-phase current i(t) in the d-axis direction d (t); S3, use i d (t) Calculate only the eigenfrequency f m The fault characteristic information i of d0 (t); S4, use FFT to analyze the fault characteristic information i d0 (t) Perform spectral analysis to extract f m S5. Compare the extracted amplitude with the amplitude at the characteristic frequency under the same working condition under normal conditions, determine the fault severity, and realize the DFIG impeller imbalance fault diagnosis. The invention only needs the stator current signal collected by the doubly-fed generator itself, and does not need to add additional sensors and data acquisition equipment, can quickly and effectively diagnose the fault of the DFIG impeller, and provide a basis for timely braking. Has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of DFIG fault diagnosis, and in particular relates to a DFIG impeller unbalance fault diagnosis method based on current signal coordinate transformation. Background technique [0002] Operation and maintenance can account for up to 30% of the cost of an offshore wind facility, and condition monitoring systems are increasingly used to detect and reduce turbine failures. In recent years, DFIG has become one of the main models in the current large-capacity wind farm case and operation. Research on how to apply condition monitoring technology to reduce DFIG failure frequency and operation and maintenance costs and increase its power generation has attracted widespread attention. Wind turbines operating in In the field or sea where the environment is extremely harsh, long-term sand wear and ice deposition may lead to the imbalance of blade quality. In addition, fatigue stress can cause the blade to crack, causin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 杨东付大伟梁健穆浩汪静
Owner 杨东
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