Active anti‐islanding detection based on pulse current injection for distributed generation systems

Hou, Chung-Chuan; Chen, Yu‐Chun

doi:10.1049/iet-pel.2012.0542

Cited by 23 publications

(14 citation statements)

References 20 publications

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“…• U ir are the aggregate irregular current and the measured irregular voltage, respectively, the surge of |Z eq | can be reflected by that of U ir [5,6]. In contrast to |Z eq |, U ir can be measured directly.…”

Section: Compatibility Issuementioning

confidence: 99%

“…According to the irregular current injection method, a DG unit (seen as a current source) injects high/low frequency currents or negative sequence fundamental frequency currents into the network and observes the resultant voltages to detect an island [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. In practice, there are some special circuit topology and control algorithms, and then how to inject a harmonic under such conditions is an interesting topic [1,4].…”

Section: Introductionmentioning

confidence: 99%

“…To cope with unbalanced grid impedance scenarios in islanding detection, a scheme was proposed in [3], which injected dual-frequency harmonic currents. Besides the sinusoidal current injection, a pulse current injection is also an option and has been studied in [5]. Negative sequence fundamental currents have been widely used in literature, for they have been extensively studied in other fields, and the manner in which such currents can be exploited for islanding detection was introduced in [6,9,12].…”

Section: Introductionmentioning

confidence: 99%

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Compatibility Issues with Irregular Current Injection Islanding Detection Methods and a Solution

et al. 2019

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Islanding detection methods, based on injecting high-/low-frequency currents or negative sequence fundamental frequency currents and observing the resultant responses, are collectively referred to as irregular current injection methods in this paper. In multi-distributed generation (DG) operation, if there is no restriction to the phase of injected irregular currents, the currents at the same frequency may cancel each other out, and then their convergent current may be too small to cause a detectable response, for which reason islanding detection will be severely affected. Accordingly, this paper raises a compatibility issue, which requires the phase difference between any two injected irregular currents to be within a certain interval. In response to this issue, a solution is proposed. According to this solution, the terminal voltage of DG units is referenced to conduct irregular currents injection, and only certain high-frequency currents are used as injected currents. If this solution is adopted by as many manufacturers as possible, the effect and reliability of such methods will be greatly improved.

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Section: Compatibility Issuementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Compatibility Issues with Irregular Current Injection Islanding Detection Methods and a Solution

et al. 2019

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“…The identification of an island is based on the changes of the irregular voltages excited by the injected irregular currents. By following this route, a second harmonic was injected in [1], [2] and [3]; even harmonics injection was proposed in [4]; a non-characteristic harmonic was used in both [5] and [6], while dual-frequency harmonics were introduced in [5] to cope with the unbalanced grid impedance; inter-harmonics were used in [7] and [8]; asymmetric sub-harmonics, which must contain a negative sequence low frequency component, were injected in [9]; a pulse current was adopted in [10]; and negative sequence currents were adopted in [11]- [13]. On the other hand, the observed objects in these references are also different, even though in some references the same irregular currents were injected.…”

Section: Use Policymentioning

confidence: 99%

Synchronization Issues with Irregular Current Injection Islanding Detection Methods in Multi-DG Operation

Liu

Zhao

Huang

et al. 2019

2019 IEEE 3rd International Conference on Green Energy and Applications (ICGEA)

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2019) 'Synchronization issues with irregular current injection islanding detection methods in multi-DG operation.', in 2019 3rd IEEE International Conference on Green Energy and Applications ; proceedings. Piscataway, NJ: IEEE, pp. 21-29.• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract-The islanding detection methods that detect an island through injecting high/low frequency currents or negative sequence currents are called irregular current injection methods in this paper. A synchronization issue of such methods is raised in multi-DG (Distributed Generation) operation. This issue requires that the same frequency irregular currents injected by DG units should be in phase toavoid cancelling each other out. If this issue is not handled properly, the effect of such methods is uncontrollable. In view of this, an approach to this issue is proposed in this paper. According to this approach, the terminal voltage of a DG unit is taken as a reference to conduct the irregular current injection, and only parts of the irregular currents whose frequencies are an integer multiple of the frequency of the reference voltage are employed. Finally, experiments and simulations verify the effect of the proposed approach.

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“…In most cases, active techniques are more effective and robust than passive ones. Thus, in most grid-connected inverters, active techniques are more frequently used than passive techniques [14], [15].…”

Section: Introductionmentioning

confidence: 99%

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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Active anti‐islanding detection based on pulse current injection for distributed generation systems

Cited by 23 publications

References 20 publications

Compatibility Issues with Irregular Current Injection Islanding Detection Methods and a Solution

Compatibility Issues with Irregular Current Injection Islanding Detection Methods and a Solution

Synchronization Issues with Irregular Current Injection Islanding Detection Methods in Multi-DG Operation

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

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