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A noise level prediction method based on electro-mechanical frequency response function for capacitors.

Lingyu Zhu1, Shengchang Ji1, Qi Shen2

  • 1State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi, China.

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|December 19, 2013
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Summary

High-voltage capacitors generate significant noise. A new electro-mechanical frequency response function (EMFRF) method accurately predicts audible noise levels in high-voltage direct-current converter stations.

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Area of Science:

  • Electrical Engineering
  • Acoustics
  • Power Systems

Background:

  • Capacitors in high-voltage direct-current (HVDC) converter stations are significant sources of audible noise, often exceeding 100 dB.
  • Current methods for predicting this noise are insufficient for practical applications.

Purpose of the Study:

  • To develop and validate a novel, accurate method for predicting audible noise levels radiated by HVDC capacitors.
  • To address the limitations of existing noise prediction techniques.

Main Methods:

  • A new electro-mechanical frequency response function (EMFRF) was defined, representing the frequency-domain relationship between vibration response and squared capacitor voltage.
  • The EMFRF was determined through impulse current experiments.
  • Vibration response was calculated by multiplying the EMFRF with the squared capacitor voltage in the frequency domain.
  • Radiated audible noise was computed using structure-acoustic coupling formulas.

Main Results:

  • The proposed method successfully predicted noise levels under laboratory conditions.
  • Experimental measurements validated the accuracy of the noise prediction model.
  • The electro-mechanical frequency response function proved effective in linking electrical and mechanical characteristics to acoustic output.

Conclusions:

  • The developed noise prediction method, utilizing the electro-mechanical frequency response function, is effective for HVDC converter stations.
  • This approach offers a significant improvement over existing methods for assessing capacitor noise.
  • Accurate noise prediction is crucial for mitigating environmental impact and ensuring operational safety.