基于混合时频域介电谱特征量的变压器扩展徳拜模型参数辨识
作者:
作者单位:

1.厦门理工学院电气工程与自动化学院;2.国网福建省电力有限公司漳平市供电公司

中图分类号:

TM411???????


Parameters identification of extended debye model of transformer based on hybrid characteristics of time-frequency domain spectrum
Author:
Affiliation:

1.School of Electrical Engineering and Automation,Xiamen University of Technology;2.State Grid Zhangping Electric Power Supply Company

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    摘要:

    针对回复电压极化谱和频域介电谱测量耗时长而影响变压器油纸绝缘系统扩展德拜等效电路参数辨识效率的问题,本文提出了一种新的测试方法。首先提出了构建由短充电时间下回复电压极化谱特征量和少量频域介电谱特征量组成的混合时频域介电谱特征量。然后基于所提出的特征量,结合多目标粒子群算法辨识电路参数,最后与现场实测的回复电压极化谱和频域介电谱特征量和测试时间做对比。研究结果表明:利用混合时频介电谱特征量构建的扩展德拜等效电路参数能够有效还原现场实测的完整回复电压极化谱极化谱和频域介电谱,两种介电谱计算值与实测值拟合度均在95%以上,且新方法比单独回复电压测量减少61%的测试时间,比单独频域介电谱测量减少46%的测试时间。新方法既保证了参数辨识精度,又大幅降低测试时间,提高测试效率,对介电谱测量技术在变压器现场绝缘检测的应用推广具有重要意义。

    Abstract:

    In view of the problem that the long measurement of recovery voltage polarization spectrum and frequency domain dielectric spectrum affect identification efficiency of the extended Debye equivalent circuit parameters of transformer oil-paper insulation system, this paper proposes a novel identification method. At first, this paper proposes characteristics of hybrid time-frequency dielectric spectrum, which consist of the recovery voltage polarization spectrum characteristics under short charging time and small amount of frequency dielectric spectrum characteristics. Then, based on these proposed characteristics, using multi-objective particle swarm optimization (PSO) to identify equivalent circuit parameters. At last, compare the test time of the proposed method with the on-site testing. The results show that: equivalent circuit parameters of the extended Debye constructed by using characteristics of the hybrid time-frequency dielectric spectrum can effectively restore the complete recovery voltage polarization spectrum and frequency domain spectrum which field measured. The coincidence between the calculated and measured values of the two kinds of dielectric spectrum is above 95%. Moreover, the new method can reduce the test time by 61% compared to the recovery voltage measurement alone and by 46% compared to the frequency domain spectrum alone. The new method not only ensures the accuracy of parameter identification, but also greatly reduces the test time and improves the test efficiency. It is of great significance to the application and popularization of dielectric spectrum measurement technology in transformer on-site insulation detection.

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  • 收稿日期:2024-12-22
  • 最后修改日期:2025-05-23
  • 录用日期:2025-06-16
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