Monitoring for Mutual Effects of Switching Power Capacitors in Power Systems

  • Published : 2008.10.20

Abstract

Power system perturbations are due to many reasons; one of the most common perturbation causes is switching off/on the power capacitors. This paper monitors and discusses the overvoltages which appear on local and remote capacitor connected buses in power systems. Using the Fast Fourier Transfer (FFT), the total harmonic content of voltages and currents waveforms is also estimated at all buses. The power factor during different cases of switching modes "off/on" is monitored. The monitoring technique tackles not only the longitudinal long distance mutual effects of switching power capacitors between different buses but also evaluates the overvoltage durations. A relative long term monitoring is implemented using the Matlab/Simulink environment to show severity assessments in different switching modes on the transformers' voltages and currents' waveforms.

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References

  1. Jinn-Chang Wu, et al, "Hybrid Switch to Suppress the Inrush Current of AC Power Capacitor", IEEE Transactions on Power Delivery, Vol. 20, No. 1, pp. 506-511, January 2005 https://doi.org/10.1109/TPWRD.2004.832355
  2. A.M.Sharaf, KH.M.ABO-AL-EZ, "A FACTS based Dynamic Capacitor Scheme for Voltage Compensation and Power Quality Enhancement", IEEE ISIE 2006, Montreal, Quebec, Canada, July 9-12, 2006
  3. M. McGranaghan, W. E. Reid, S. Law, D. Oresharn, "Overvoltage Protection of Shunt Capacitor Banks Using MOV Arrestors", IEEE Transaction PAS, Vol. I04, No.8, pp. 2326-2336, August 1984
  4. M. F. McGranaghan, T. E. Grebe, G. Hensley, T. Singh, M. Samotyj, "Impacts of utility switched capacitors on customer systems-II. Adjustable speed drive concerns", IEEE Trans. Power Delivery, Vol. 64, No. 4, pp. 1623-1628, Oct. 1991
  5. T. E. Grebe, "Application of distribution system capacitor banks and their impact on power quality", IEEE Trans. Ind. Appl., Vol. 32, No. 3, pp. 714-719, May/Jun. 1996 https://doi.org/10.1109/28.502186
  6. Surya Santoso, "On Determining the Relative Location of Switched Capacitor Banks", IEEE Transactions on power delivery, Vol. 22, No. 2, April 2007