Adaptive Tuning of Frequency Thresholds Using Voltage Drop Data in Decentralized Load Shedding

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Abstrakt

Load shedding (LS) is the last firewall and the most expensive control action against power system blackout. In the conventional under frequency LS (UFLS) schemes, the load drop locations are already determined independently of the event location. Furthermore, the frequency thresholds of LS relays are prespecified and constant values which may not be a comprehensive solution for widespread range of possible events. This paper addresses the decentralized LS in which the instantaneous voltage deviation of load buses is used to determine the frequency thresholds of LS relays. The higher frequency thresholds are assigned to the loads with larger voltage decay which are often located in the vicinity of disturbance location. The proposed method simultaneously benefits from individual UFLS and under voltage LS (UVLS) features which operate in the power system without coordination. Numerical simulations in DigSilent PowerFactory software confirm the efficiency of proposed methodology in the stabilization of the power system after various severe contingencies.
OriginalsprogEngelsk
Artikelnummer6893056
TidsskriftIEEE Transactions on Power Systems
Vol/bind30
Udgave nummer4
Sider (fra-til)2055-2062
ISSN0885-8950
DOI
StatusUdgivet - 1 jul. 2015

Emneord

  • Adaptive frequency threshold
  • decentralized under voltage load shedding
  • protection relay

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