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Energies 2018, 11(9), 2421; https://doi.org/10.3390/en11092421

Improved Three-Phase AFD Islanding Detection Based on Digital Control and Non-Detection Zone Elimination

1
Automobile Engineering Technology Research Institution, Hefei University of Technology, Hefei 230009, China
2
State Grid Hefei Electric Power Supply Company, Hefei 230001, China
*
Author to whom correspondence should be addressed.
Received: 23 August 2018 / Revised: 7 September 2018 / Accepted: 10 September 2018 / Published: 13 September 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

This paper proposes an improved active frequency drift (AFD) islanding detection method of a three-phase inverter. Different than the existing single-phase AFD method, in the three-phase system, the disturbance is added to the phase angle, which takes part in coordinate transformation calculations. Thus, the frequency drift of the three-phase reference current can be realized by the disturbance of the phase angle. It is unnecessary to add frequency drift to each phase respectively with the proposed method, which can simplify the control system. Furthermore, the non-detection zone can be eliminated by updating certain parameters; therefore, the detection method is sensitive. In this paper, the application of the proposed method in a digital control system is discussed in detail. The non-detection zone is analyzed, and an elimination method is proposed. Finally, the simulation and experimental results are given to verify the theoretical analysis. View Full-Text
Keywords: three-phase inverter; islanding detection; non-detection zone; zero-crossing correction; active frequency drift three-phase inverter; islanding detection; non-detection zone; zero-crossing correction; active frequency drift
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Zheng, X.; Zhang, R.; Chen, X.; Sun, N. Improved Three-Phase AFD Islanding Detection Based on Digital Control and Non-Detection Zone Elimination. Energies 2018, 11, 2421.

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