A Hybrid Islanding Detection Method Based on the Rates of Changes in Voltage and Active Power for the Multi-Inverter Systems

Masoumeh Seyedi, Seyed Abbas Taher, Babak Ganji, Josep Guerrero

Research output: Contribution to journalJournal articleResearchpeer-review

1 Citation (Scopus)


This paper proposes hybrid islanding detection for inverter-based distributed generation (DG) units. Conventionally, passive islanding detection methods may fail when power mismatches are nearly zero. Also, the difficulty of setting threshold is another common problem. To overcome this drawback, a new procedure for islanding detection is proposed based on the combination of the rate of change of voltage (ROCOV) and the rate of change of active power (ROCOAP). The ROCOAP is only activated when the islanding condition is suspected by ROCOV. When the power mismatch is negligible, some high-impedance fault or non-islanding events occur, the proposed method can identify islanding, thus presenting a combination of advantages of each passive/active method. Therefore, it is useful to appropriately detect islanding situation in all-inclusive of scenarios. Consequently, the proposed method under several conditions, such as pulsating loads, pre-energized transformers have been considered. To illustrate the effectiveness of the proposed approach, various tests such as UL1741 have been investigated. Comparison analysis shows that the suggested method is more acceptable and the NDZ is reduced significantly. In addition, proper performance even for small power mismatch is illustrated by presence of variety of non-islanding events and improvement of power quality is achieved in comparison active method.

Original languageEnglish
JournalIEEE Transactions on Smart Grid
Issue number4
Pages (from-to)2800-2811
Number of pages12
Publication statusPublished - 2021

Bibliographical note

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Copyright 2021 Elsevier B.V., All rights reserved.


  • Hybrid method
  • Inverter-based DGs
  • Inverters
  • Islanding
  • Islanding detection
  • Multi DGs.
  • Non-detection zone
  • Power quality
  • Rate of change of active power
  • Rate of change of voltage
  • Resonant frequency
  • Switches
  • Voltage control
  • Voltage measurement


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