Active Frequency Drift Method for Islanding Detection Applied to Micro-inverter with Uncontrollable Reactive Power

Raeho Kwak; June-Hee Lee; Kyo-Beum Lee

Active Frequency Drift Method for Islanding Detection Applied to Micro-inverter with Uncontrollable Reactive Power

Raeho Kwak

June-Hee Lee

Kyo-Beum Lee

Vol. 16, No. 5, pp. 1918-1927, Sep. 2016

10.6113/JPE.2016.16.5.1918

Active Frequency Drift (AFD)

Anti-islanding

Grid-connected inverter

Islanding phenomenon

Micro-inverter

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Abstract

This paper proposes active frequency drift (AFD) as an anti-islanding method applied to micro-inverters with uncontrollable reactive power. When using ordinary inverter topologies, such as full bridge inverters in photovoltaic systems, the islanding phenomenon can be detected with reactive power-based methods, such as reactive power variation. However, when the inverter topology cannot control the reactive power, conventional anti-islanding methods with reactive power cannot be utilized. In this work, the topology used in this paper cannot control the reactive power. Thus, an anti-islanding method that can be used in topologies that cannot control the reactive power is proposed. The conventional anti-islanding method of the topology that cannot control reactive power is introduced and analyzed. Unlike the conventional AFD method, the proposed method extends a zero current interval every predetermined cycle. The proposed method offers certain advantages over conventional AFD methods, such as total harmonic distortion. The proposed method is validated through simulation and experiment.

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Cite this article

[IEEE Style]

R. Kwak, J. Lee, K. Lee, "Active Frequency Drift Method for Islanding Detection Applied to Micro-inverter with Uncontrollable Reactive Power," Journal of Power Electronics, vol. 16, no. 5, pp. 1918-1927, 2016. DOI: 10.6113/JPE.2016.16.5.1918.

[ACM Style]

Raeho Kwak, June-Hee Lee, and Kyo-Beum Lee. 2016. Active Frequency Drift Method for Islanding Detection Applied to Micro-inverter with Uncontrollable Reactive Power. Journal of Power Electronics, 16, 5, (2016), 1918-1927. DOI: 10.6113/JPE.2016.16.5.1918.