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Stabilizing a DG-fed islanded system through load shedding on the basis of the rate of change of frequency and voltage drop

Amini, H ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1002/etep.1934
  3. Publisher: John Wiley and Sons Ltd , 2015
  4. Abstract:
  5. The islanding of a distributed generation (DG)-fed distribution system generally results in frequency drop, which means less power is generated than it is needed. The only way of dealing with this problem is shedding loads as the system cannot generate any more electricity. Load shedding is intended to restore balance between generated and consumed power. This paper proposes a new method for load shedding based on the rate of change of frequency (RoCoF) at the first step and on voltage drop at subsequent steps. For this purpose, three lookup tables were created in order to prioritize loads to be shed according to the willingness of subscribers to pay and the RoCoF. The strength of the proposed method was verified by considering four cases. Consumption load was considered as voltage and frequency dependent in three of the cases, and as constant power in the fourth case. The results indicate that the proposed method is flexible and, in comparison with previous research, results in a slighter frequency drop and stabilizes the islanded system in a shorter time
  6. Keywords:
  7. Rate of change of frequency ; Distributed power generation ; Electric power distribution ; Electric power plant loads ; Table lookup ; DG resources ; Islanding ; Load-shedding ; Rate of change of frequencies ; Voltage drop ; willingness of subscribers to pay ; Electric load shedding
  8. Source: International Transactions on Electrical Energy Systems ; Volume 25, Issue 10 , June , 2015 , Pages 1976-1991 ; 20507038 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/etep.1934/abstract;jsessionid=13829D15045E8C6CE16F5E79C34394C5.f02t03