The Transactions of the Korean Institute of Electrical Engineers A (대한전기학회논문지:전력기술부문A)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

S-Domain Equivalent System for Electromagnetic Transient Studies PART I : Frequency Dependent Network Equivalent

전자기 과도현상 해석을 위한 S 영역 등가시스템 PART I : 주파수 의존 시스템 등가

  • 왕용필 (동아대 전기전자컴퓨터공학부)
  • Published : 2003.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

Modern power systems are very complex and to model them completely is impractical for electromagnetic transient studies. Therefore areas outside the immediate area of interest must be represented by some form of frequency dependent equivalent. The s-domain rational function form of frequency dependent equivalent does not need refitting if the simulation time-step is changed in the electromagnetic transient program. This is because the s-domain rational function coefficients are independent of the simulation time-step, unlike the z-domain rational function coefficients. S-domain rational function fitting techniques for representing frequency dependent equivalents have been developed using Least Squares Fitting(LSF). However it does not suffer the implementation error that exited in this work as it ignored the instantaneous term. This paper Presents the formulation for developing 1 Port Frequency Dependent Network Equivalent(FDNE) with the instantaneous term in S-domain and illustrates its use. This 1 port FDNE have been applied to the CIGRE Benchmark Rectifier test AC system. The electromagnetic transient package PSCAD/EMTDC is used to assess the transient response of the 1 port (FDNE) developed with Thevenin and Norton Equivalent network. The study results have indicated the robustness and accuracy of 1 port FDNE for electromagnetic transient studies.

Keywords

References

  1. Hingorani N.G. and Burbery M.F., 'Simulation of AC System Impedance in HVDC System Studies', IEEE Transactions on Power Apparatus and Systems, Vol. PAS-89, No. 5/6, May/June 1970, pp 820-828 https://doi.org/10.1109/TPAS.1970.292644
  2. Do V.Q. and Gavrilovic M.M., 'A Synthesis method for One Port and Multi-Port Equivalent Networks for Anaysis of Power System Transients', IEEE Transactions on Power Delivery, Vol. PWRD-1, No. 2, April 1986, pp 103-111
  3. Medina A., Arrillaga J. and Watson N.R., 'Derivation of Multi-Harmonic Equivalent Models of Power Networks', Proceedings of the 1990 International Conference on Harmonics in Power Systems, Budapest, Hungary, 4-6 Oct, 1990
  4. Morched A.S., Ottevangers J.H. and Marti L., 'Multi Port Frequency Dependent Network Equivalents for the EMTP', IEEE Transactions on Power Delivery, Vol. 8, No. 3, July 1993, pp 1403-1412 https://doi.org/10.1109/61.252667
  5. Nota T., Nagaoka N. abd Ametani A. 'Phase-Domain Modelling of Frequency-Dependent Transmission Lines by Means of an ARMA Model', IEEE Transactions on Power Delivery, Vol. 11, No. 1, January 1996, pp 401-411 https://doi.org/10.1109/61.484040
  6. Todd S., Wood A.R., Bodger P.S. and Smith B.C., 'Rational functions as frequency dependent equivalents for transient studies', Proceedings of the 1997 International Conference on Power Systems Transients, pp 137-144, June 1997, Seattle, USA
  7. Gustavsen B. and Semlyen A., 'Simulation of Transmission Line Transients Using Vector Fitting and Modal Decomposition', IEEE Transactions on Power Delivery, Vol. 13, No. 2, April 1998, pp 605-614 https://doi.org/10.1109/61.660941
  8. Wang Y. P. and Watson N. R., 'Z-domain frequency-dependent AC-system equivalent for electromagnetic transient simulation', IEE Proceeding-Generation, Transmission and Distribution, Vol. 150, 2003 https://doi.org/10.1049/ip-gtd:20030150
  9. M. Szechtmann, T. Weiss and C. V. Thio, 'First benchmark model for HVdc control studies', Electra, No. 135, April 1991, pp 55-75