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Doubly-fed wind power generator stator winding inter-turn short circuit modeling and feature extraction method

A doubly-fed wind power generation and wind turbine technology, which is applied in the measurement of electricity, measurement of electrical variables, and electrical digital data processing, etc., can solve the problems of weak fault signals, complex current signal components, and large influence of interference signals.

Active Publication Date: 2015-10-21
XI AN JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

[0004] Usually, the composition of the current signal is more complex when the doubly-fed wind turbine is in normal operation, the fault signal is weaker when the stator winding is short-circuited, and the interference signal has a great influence. Fault characteristics

Method used

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  • Doubly-fed wind power generator stator winding inter-turn short circuit modeling and feature extraction method
  • Doubly-fed wind power generator stator winding inter-turn short circuit modeling and feature extraction method
  • Doubly-fed wind power generator stator winding inter-turn short circuit modeling and feature extraction method

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Embodiment Construction

[0052] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0053] The method for modeling and feature extraction of the inter-turn short circuit of the stator winding of the doubly-fed wind power generator of the present invention comprises the following steps:

[0054] 1) According to the design parameters and operating parameters of the DFIG, the normal model of the DFIG based on finite elements is established, and its flow chart is as follows figure 1 As shown, the normal geometric model obtained by modeling is as follows figure 2 shown;

[0055] 2) Change the connection mode of the stator winding of the doubly-fed wind turbine in its normal geometric model and external circuit respectively, split and short-circuit a certain phase and branch of the stator in the normal simulation model, and obtain the stator winding turns of the doubly-fed wind turbine The simulation model of the short...

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Abstract

The invention discloses a doubly-fed wind power generator stator winding inter-turn short circuit modeling and feature extraction method comprising the following steps: establishing a normal model of a doubly-fed wind power generator according to the design parameters and operation parameters of the doubly-fed wind power generator; performing splitting and short-circuit setting on a certain branch of a certain phase of a stator of the normal simulation model to obtain a simulation model of a doubly-fed wind power generator stator winding inter-turn short circuit fault, wherein the coils of the branch of the phase are connected in series under normal circumstances in external circuit connection; and short-circuiting a short-circuit coil when stator winding inter-turn short circuit occurs. The simulation result is analyzed, the phase difference of three-phase current of the stator, the total harmonic distortion (THD), and the semi-major axis length, semi-minor axis length and eccentricity of Park vector trajectory are calculated, and the phase difference of three-phase current of the stator, the total harmonic distortion (THD) and the eccentricity of Park vector trajectory are extracted as fault features.

Description

Technical field: [0001] The invention belongs to the field of fault modeling and feature extraction of a doubly-fed wind power generator, and in particular relates to a method for modeling and feature extraction of a short-circuit between turns of a stator winding of a doubly-fed wind power generator. Background technique: [0002] Doubly-fed wind turbines are widely used in the wind power industry, and they are an important part of wind turbines. Due to its complex operating conditions, faults occur frequently, which directly affect the safety and efficiency of the power grid. According to statistics, 40% of the failures are related to bearings, and 38% and 20% of the failures are related to the stator and rotor of the motor. Therefore, if an effective simulation model of the early failure of the DFIG can be established and the characteristic quantities that can reflect the early failure of the motor can be extracted, measures can be taken early to prevent the occurrence o...

Claims

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Application Information

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IPC IPC(8): G01R31/06G06F17/50
Inventor 陈玉王路路万路殷勇鸿
Owner XI AN JIAOTONG UNIV
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