首页|基于对称分量法的调相机定子故障特征分析

基于对称分量法的调相机定子故障特征分析

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传统同步调相机定子绕组匝间短路故障机理分析方法通常认为电机定子电流接近三相对称,并以此为基础建立同步调相机故障电流的数学表征.但是,一旦发生定子绕组匝间短路故障,同步调相机三相定子电流的对称性将遭到破坏,使得传统故障机理分析方法所建立的数学表征无法准确反映电机内部电气量的变化.文中通过引入对称分量法,建立故障后同步调相机瞬时有功/无功功率的数学模型,提出利用瞬时有功/无功功率中的 2 次谐波进行定子绕组匝间短路故障诊断.仿真和实验的结果表明:相较于利用定子电流 3 次谐波与基波幅值之比诊断故障的传统方法,文中方法在轻微故障状态下能提高至少 7 倍的诊断灵敏度,更易完成早期故障诊断.同时,所提方法中的故障特征量不受同步调相机工况和故障位置的影响,具有强鲁棒性.
Fault feature analysis of stator winding for synchronous condenser based on symmetrical component method
The traditional method for analyzing the mechanism of stator winding inter turn short-circuit faults of synchronous condensers usually assumes that the stator current of the motor is close to three-phase symmetry,and based on this,a mathematical representation of the fault current of synchronous condensers is established.However,once a stator winding inter turn short-circuit fault occurs,the symmetry of the three-phase stator current of the synchronous condenser will be disrupted,making the mathematical representation established by traditional fault mechanism analysis methods unable to accurately reflect the changes in the internal electrical quantities of the motor.A mathematical model is established for the instantaneous active and reactive power of a synchronous condenser after a fault by introducing the symmetrical component method.Using the second harmonic in the instantaneous active and reactive power for stator winding inter turn short-circuit fault diagnosis is proposed.The simulation and experimental results indicate that compared to the traditional method of diagnosing faults using the ratio of the third harmonic of stator current to the amplitude of the fundamental wave,the proposed method can improve the diagnostic sensitivity by at least seven times under mild fault conditions,making it easy to complete early fault diagnosis.At the same time,the fault feature quantities in the proposed method are not affected by the synchronous condenser operating conditions and fault locations,and also have strong robustness.

synchronous condenserstator winding inter turn short-circuitsymmetrical component methodinstantaneous powerfault diagnosisultra-high voltage direct current transmission system

谷兵、蒋琛、黄思遥、蔚超、王伟、程明

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江苏方天电力技术有限公司,江苏 南京 211102

东南大学电气工程学院,江苏 南京 210096

同步调相机 定子绕组匝间短路 对称分量法 瞬时功率 故障诊断 特高压直流输电系统

国家自然科学基金江苏方天电力技术有限公司科技项目

51991384KJ202109

2024

10.12158/j.2096-3203.2024.02.022

电力工程技术
江苏省电力公司 江苏省电机工程学会

电力工程技术

CSTPCD北大核心
影响因子：0.969
ISSN：2096-3203
年,卷(期)：2024.43(2)
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