Analysis of Global Oscillation via Sync Search in Power Systems

전력계통에서 동조탐색과 광역진동해석

  • 심관식 (전남대 공업기술연구소) ;
  • 남해곤 (전남대 공대 전기공학과) ;
  • 김용구 (한국폴리텍 V대학 전기계측제어과) ;
  • 문영환 (한국전기연구원 SmartGrid 센터) ;
  • 김상태 (한전KDN 전력IT연구원)
  • Published : 2009.07.01

Abstract

The present study explained the phenomenon that low frequency oscillation is synchronized with discrete data obtained from a wide area system, and a sync search method. When a disturbance occurs in an power system, various controllers operate in order to maintain synchronization. If the system's damping is poor, low frequency oscillations continue for a long time and the oscillations are synchronized with one another at specific frequency. The present study estimated dominant modes, magnitude and phase of signals by applying parameter estimation methods to discrete signals obtained from an power system, and performed sync search among wide area signals by comparing the estimated data. Sync search was performed by selecting those with the same frequency and damping constant from dominant oscillation modes included in a large number of signals, and comparing their magnitude and phase. In addition, we defined sync indexes in order to indicate the degree of sync between areas in a wide area system. Furthermore, we proposed a wide area sync search method by normalizing mode magnitude in discrete data obtained from critical generator of the wide area. By applying the sync search method and sync indexes proposed in this study to two area systems, we demonstrated that sync scanning can be performed for discrete signals obtained from power systems.

Keywords

References

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