Analysis and performance assessment of the active frequency drift method of islanding prevention

Ropp, Michael; Begović, Miroslav; Rohatgi, A.

doi:10.1109/60.790956

Cited by 316 publications

(173 citation statements)

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“…The grid-connected inverter normally operates with a unity power factor. The inverter generates an output voltage that is synchronized with the grid voltage; thus, the frequency of the output voltage is equal to the grid frequency [9]. When islanding occurs, the added zero conduction in the current produces a permanent drift in the operating frequency toward the resonance frequency of the local load to maintain a unity power factor.…”

Section: B Basic Principle Of Afd Methodsmentioning

confidence: 99%

“…Equations (10) and (11) show the NDZ resulting from a power mismatch [9], [10]. In the AFD method, increasing the injected reactive power to diminish the NDZ increases the output current THD because Q/P=THD, as shown in (16) [10].…”

Section: Principle Of the Proposed Methodsmentioning

confidence: 99%

“…In the AFD method, increasing the injected reactive power to diminish the NDZ increases the output current THD because Q/P=THD, as shown in (16) [10]. Equation (11) is derived by applying the parameters to (9). If the mismatch of the reactive power lies in this interval, islanding is not detected.…”

Section: Principle Of the Proposed Methodsmentioning

confidence: 99%

“…11 [20]. The zero conduction interval causes the current injected into the grid by the DG to be slightly distorted (6) such that when islanding occurs, the frequency of the PCC voltage drifts up or down according to (2) [9].…”

Section: B Basic Principle Of Afd Methodsmentioning

confidence: 99%

See 3 more Smart Citations

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

Kwak¹,

Lee²,

Lee³

2016

Journal of Power Electronics

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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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Section: B Basic Principle Of Afd Methodsmentioning

confidence: 99%

Section: Principle Of the Proposed Methodsmentioning

confidence: 99%

Section: Principle Of the Proposed Methodsmentioning

confidence: 99%

Section: B Basic Principle Of Afd Methodsmentioning

confidence: 99%

See 2 more Smart Citations

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

Kwak¹,

Lee²,

Lee³

2016

Journal of Power Electronics

View full text Add to dashboard Cite

show abstract

“…An important characteristic of the VPF based methods is the low power quality degradation in contrast with other active methods that use distorted signals injection, as proposed in [14] and [15].…”

Section: Voltage Positive Feedback Islanding Detection Methodsmentioning

confidence: 99%