Detection and switching control scheme of unintentional islanding for ‘hand‐in‐hand’ DC distribution network

Song, Weiwei; Chen, Yanfeng; Wen, An; Zhang, Yongjun; Cheng-zhi, Wei

doi:10.1049/iet-gtd.2018.5942

Cited by 7 publications

(5 citation statements)

References 23 publications

(30 reference statements)

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“…The simulation outputs endorsed zero NDZ of the presented scheme with better real-time performance, i.e. detection within 283 ms. Song et al presented the status of the CBs in a DC distribution network, assisted by a local-based criteria [13]. Islanding condition is detected in case the CB(s) status changes to open.…”

Section: Telecommunication-based Methodsmentioning

confidence: 99%

“…detection within 283 ms. Song et al. presented the status of the CBs in a DC distribution network, assisted by a local‐based criteria [13]. Islanding condition is detected in case the CB(s) status changes to open.…”

Section: Islanding Detection Methodologies For Grid‐connected Photovo...mentioning

confidence: 99%

“…The first type relies basically on broadband technologies such as optic-fibre and power line communications for establishing direct communication between the CB of the substation-feeder and the CB located at the DG interconnection bus. Albeit several communication protocols can be established, the islanding mode is normally identified quickly after the operation of the CB between the upstream grid and DG(s) path [9][10][11][12][13]. Although these schemes are known as the most reliable islanding classifiers for both inverter-and synchronousbased technologies, the expensive structure limits its practical implementation in small-scale DGs such as residential GCPVSs [14].…”

Section: Introductionmentioning

confidence: 99%

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Review on islanding detection methods for grid‐connected photovoltaic systems, existing limitations and future insights

Bakhshi‐Jafarabadi

Sadeh

Serrano‐Fontova

et al. 2022

IET Renewable Power Gen

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The connection of renewable energy sources (RESs) to the distribution network has been rising at a steady pace over the past decades. The great penetration of RESs such as grid-connected photovoltaic system brings new technical challenges to the distribution networks such as unintentional islanding. Conceptually, this situation occurs when a portion of the network that has been isolated from the main grid remains energised by the embedded RESs. This unexpected scenario should be thereby identified effectively to avoid frequency and voltage deviations and their hazardous effects. The aim of this paper is to provide a comprehensive review on the recently developed islanding detection methods for grid-following/grid-connected photovoltaic system, analyse their existing limitations, and suggest possible future research implementations. In this context, an in-depth comparison is provided considering the main features used in islanding detection methods such as non-detection zone, detection time, implementation cost and complexity, and power quality degradation. Finally, the main technical requirements established by the current grid codes are recalled identifying potential multi-functional approaches to expand the current islanding detection capabilities.

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Section: Telecommunication-based Methodsmentioning

confidence: 99%

Section: Islanding Detection Methodologies For Grid‐connected Photovo...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Review on islanding detection methods for grid‐connected photovoltaic systems, existing limitations and future insights

Bakhshi‐Jafarabadi

Sadeh

Serrano‐Fontova

et al. 2022

IET Renewable Power Gen

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“…At present, the research on DC islanding protection mainly relies on AC active IDMs. Literature [26] proposes an IDM based on the switching state of DC circuit breakers, but the method only studies a specific single-PV system. Its performance might be poor for a multi-terminal system with a large number of switches.…”

Section: Introductionmentioning

confidence: 99%

Islanding detection method for multi‐terminal renewable power DC distribution system

Jia

Jin

Shi

et al. 2021

IET Renewable Power Gen

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Most of the traditional islanding detection methods are designed for renewable sources in AC systems and cannot be directly applied in multi-terminal DC renewable power distribution systems. Moreover, the attenuation effect of multi-branches makes it difficult for active methods to effectively detect complex islanding operations with multiple renewable power sources. To address the above problems, this paper proposes an active high-frequency impedance estimation based DC islanding detection method. The impedance of converters is proved to be a constant value at high-frequencies, and the high-frequency impedance of the system changes significantly after islanding. Therefore, islanding operations can be accurately detected through impedance characteristics with a negligible none detection zone. The proposed islanding detection method uses DC/DC converters to inject non-characteristic harmonics to perform high-frequency impedance calculations without additional injection equipment. The high-frequency impedance directly reflects structural changes of the DC system. In this case, this method has lower requirements on the disturbance intensity and will not be influenced by the attenuation effect. The injected harmonic voltage is used as an auxiliary criterion to detect complex DC islanding operations with multiple renewable sources. Simulation results prove that the proposed method has high detection accuracy and is not affected by transient conditions. INTRODUCTIONWith the development of renewable power generation technology [1][2][3][4], the integration of renewable power sources through Modular Multilevel Converter (MMC) based flexible DC distribution system has become a research hot topic due to the advantages of less commutation links, higher energy conversion rate and better power quality [5][6][7]. Several demonstration projects of MMC-DC distribution system have been establishedin . In a DC distribution system with photovoltaic (PV) sources, unplanned islanding operations pose safety hazards to both personnel and equipment. Islanding detection method (IDM) in DC systems needs to be investigated. At present, IDMs can be divided into communicationbased methods and local measurement-based methods.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…An unintentional islanding detection method based on the combination of the main criterion of switch status and the auxiliary criterion based on the no-current and difference-voltage criteria was proposed for "hand-in-hand" DC distribution network in [14]. However, the power supply reliability of the DC distribution network must be considered.…”

Section: Introductionmentioning

confidence: 99%

The Improvement of an Islanding Detection Method Based on the Perturbation Signal in Case of a Multi-Photovoltaic Operation

2019

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Islanding phenomenon is one of the consequences of the emergence and development of microgrids in the power system. Injected signal cancellation is a common problem in a multi- distributed generation that has a significant influence on active islanding detection methods. In this study, this issue was analyzed by injecting a perturbation signal in the multi-photovoltaic system. Furthermore, the promising solution to eliminate injected signal cancellation was proposed in this paper. The solution was validated through mathematical explanations and simulation results.

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Detection and switching control scheme of unintentional islanding for ‘hand‐in‐hand’ DC distribution network

Cited by 7 publications

References 23 publications

Review on islanding detection methods for grid‐connected photovoltaic systems, existing limitations and future insights

Review on islanding detection methods for grid‐connected photovoltaic systems, existing limitations and future insights

Islanding detection method for multi‐terminal renewable power DC distribution system

The Improvement of an Islanding Detection Method Based on the Perturbation Signal in Case of a Multi-Photovoltaic Operation

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