Improved voltage shift islanding detection method for multi-inverter grid-connected photovoltaic systems

Improved voltage shift islanding detection method for multi-inverter grid-connected photovoltaic systems

For access to this article, please select a purchase option:

Buy article PDF
(plus tax if applicable)
Buy Knowledge Pack
10 articles for £75.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Your details
Why are you recommending this title?
Select reason:
IET Generation, Transmission & Distribution — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

This study presents an improved voltage shift islanding detection method with the new control mode. The proposed method adopts the modulation index shift scheme based on the pulse-width modulation control principle, which can promote the detection performance in the multi-inverter grid-connected photovoltaic (PV) systems, compared with the conventional voltage positive feedback (VPF) method. The superposition algorithm of the proposed method can make the rapid reduction of voltage magnitude at the point of common coupling during the islanding condition, and minimise the non-detection zone. Through the self-varying positive feedback gain, the synchronisation of voltage shift rates from multiple PV inverters can be effectively improved under the varying active power conditions. According to the characteristic of maximum power point tracking control, the gain will be automatically changed along with the variable PV voltage. The advantage of the proposed method is analysed by the simulation results in comparison with the conventional VPF method. Moreover, the experimental results are provided to verify the effectiveness of the proposed method.


    1. 1)
    2. 2)
      • 2. The Institute of Electrical and Electronics Engineers: ‘IEEE Recommended Practice for Utility Interface of Photovoltaic (PV) Systems’, IEEE Standard 929-2000, 2000.
    3. 3)
      • 3. The Institute of Electrical and Electronics Engineers: ‘IEEE Standard for Interconnecting Distributed Resources with Electric Power Systems’, IEEE Standard 1547-2003, 2003.
    4. 4)
    5. 5)
      • 5. Ye, Z., Walling, R., Garces, L., et al: ‘Study and development of anti-islanding control for grid-connected inverters’. Technical Report NREL/SR-560-36243, National Renewable Energy Laboratory, 2004.
    6. 6)
    7. 7)
    8. 8)
    9. 9)
    10. 10)
    11. 11)
    12. 12)
    13. 13)
    14. 14)
    15. 15)
    16. 16)
    17. 17)
    18. 18)
    19. 19)
    20. 20)
    21. 21)
    22. 22)
    23. 23)
    24. 24)
    25. 25)
      • 25. Holmes, D.G., Lipo, T.: ‘Pulse width modulation for power converters: principles and practice’ (IEEE Press, Piscataway, NJ, 2003).
    26. 26)

Related content

This is a required field
Please enter a valid email address