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Fault detection method for doubly-fed induction generator based on sliding mode observer

A technology of doubly-fed induction motor and sliding mode observer, which is applied in motor generator testing, control generator, motor generator control and other directions, can solve problems affecting system reliability, etc. Strong harassment effect

Active Publication Date: 2021-06-15
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the reliability of the entire system is affected by the voltage drop, the short circuit between the stator turns and the failure of the rotor current sensor in the doubly-fed induction generator system. Detection method for voltage sag, stator turn-to-turn short circuit and rotor current sensor fault of doubly-fed induction generator respectively

Method used

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  • Fault detection method for doubly-fed induction generator based on sliding mode observer
  • Fault detection method for doubly-fed induction generator based on sliding mode observer
  • Fault detection method for doubly-fed induction generator based on sliding mode observer

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specific Embodiment approach 1

[0024] Specific embodiment one: the doubly-fed induction generator fault detection method based on sliding mode observer described in this implementation method, it comprises the following steps:

[0025] Step 1. The stator side of the doubly-fed induction motor is connected to the grid terminal, and the stator voltage signal can be obtained through the voltage sensor , the stator current signal can be obtained through the current sensor , the rotor side of the doubly-fed induction motor is connected to the back-to-back power converter and the rotor voltage signal can be obtained through the voltage sensor , the rotor current signal can be obtained through the current sensor ;

[0026] Step 2: Transform the stator and rotor voltage signals through clark and park to obtain synchronous rotation Stator and rotor voltage signal in the coordinate system , , at the same time, the stator and rotor current signals are transformed by clark and park to obtain synchronous rot...

specific Embodiment approach 2

[0034] Specific embodiment two: this embodiment is a further limitation of the sliding mode observer-based doubly-fed induction generator fault detection method described in specific embodiment one,

[0035] In step 3, according to the voltage equation and the flux equation of the double-fed motor, the method of establishing the state space equation is as follows:

[0036] The voltage equation is:

[0037] ,

[0038] ,

[0039] The flux linkage equation is:

[0040] ,

[0041] ,

[0042] ,

[0043] In the formula, respectively The stator and rotor voltage vectors of the shaft, respectively The stator and rotor current vectors of the shaft, respectively The flux vectors of the stator and rotor of the shaft, are the rotor and stator resistances, respectively, are the self-inductance of the stator and rotor, respectively, is the mutual inductance between the stator and rotor, are the leakage inductance of the stator and rotor, respectively, ar...

specific Embodiment approach 3

[0048] Specific embodiment three: this embodiment is a further limitation of the sliding mode observer-based doubly-fed induction generator fault detection method described in specific embodiment one,

[0049] In step 4, when only the rotor current state space model is considered, the stator voltage oriented control method is used to obtain the relationship between the stator current item and the rotor current item, and the method to obtain the state equation without the stator current item is:

[0050] The stated only considers the stator current When the state space model is used, its state space model is:

[0051]

[0052] In the formula , , , , , , , respectively The stator and rotor voltage vectors of the shaft, respectively The stator and rotor current vectors of the shaft, are the rotor and stator resistances, respectively, are the self-inductance of the stator and rotor, respectively, is the mutual inductance between the stator and rotor...

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Abstract

In order to detect the fault of doubly-fed induction generator, a fault detection method of doubly-fed induction generator based on sliding mode observer is proposed here. Due to the advantages of the sliding mode observer such as simple structure, not easily affected by parameters, and strong anti-interference ability, the invention applies the sliding mode observer to the fault detection of the doubly-fed induction motor. First, the present invention builds a sliding mode observer based on the mathematical model of the doubly-fed induction generator, observes the rotor current and speed, and realizes fault self-detection by comparing the residual between the actual rotor current value and the observed value. Then the present invention provides three kinds of faults, namely grid end voltage drop fault, doubly-fed induction generator stator turn-to-turn fault and rotor current sensor fault, to prove that the sliding mode observer can perform fault detection on faults occurring at different positions. , and it can be seen that the sliding mode observer has the characteristics of fast response and good stability.

Description

technical field [0001] The invention relates to a double-fed induction motor fault detection method based on a sliding mode observer, which belongs to the field of electric control. Background technique [0002] As a new form of power generation, wind power has been connected to the power grid on a large scale, which has changed the stable operation characteristics of the traditional power system dominated by synchronous generators. With the vigorous development of wind power generation, the total installed capacity of wind power has grown rapidly, and the capacity of single units has continued to increase. The proportion of installed wind power generation in the total installed capacity of the power system has continued to increase, especially in some areas with abundant wind energy resources and concentrated wind power installed capacity. , wind power generation has occupied an important position in the local power system, and has become an important power injection node o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/13H02P21/14H02P21/24H02P21/22G01R31/34
CPCG01R31/34H02P21/0007H02P21/13H02P21/14H02P21/22H02P21/24
Inventor 蒋丹于文新王俊年
Owner HUNAN UNIV OF SCI & TECH
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