Islanding detection method of multi‐port photovoltaic DC micro grid based on harmonic impedance measurement

Jia, Ke; Zhu, Zhanxing; Zhao, Qian; Yang, Zhe; Bi, Tianshu

doi:10.1049/iet-rpg.2019.0271

Cited by 30 publications

(11 citation statements)

References 38 publications

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“…32 Moreover, the impedance limit is difficult to determine as it requires an exact grid impedance although it is extremely irregular and initially unknown. 33 However, in practice, this method is hard to implement.…”

Section: Active Idmsmentioning

confidence: 99%

A comprehensive review on intelligent islanding detection techniques for renewable energy integrated power system

Panigrahi

Bhuyan

Shukla

et al. 2021

Intl J of Energy Research

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Summary Renewable sources of energy are used extensively in the distribution grid to meet the need for growing electricity demand and to resolve the global heating crisis caused by traditional energy sources. They offer many advantages like better efficiency, power quality, and lower air pollution. One of the vital issues with these integrations is islanding condition arising due to the sudden disconnection of grid because of some abnormal situations; however, the distributed generation (DG) retains the power supply to the local loads. Thus, efficient detection of islanding and quick detachment of DG are vital to prevent failure of equipments, grid safety disruption, and risks to personnel safety. In this context, this article represents a comprehensive review of islanding issues and different islanding detection methods (IDMs) that provide a detailed assessment for filling the research gap and thereby highlights the various issues related to island detection. A broad classification of IDMs is established based on the conventional and modern techniques such as local (Active, Passive & Hybrid) and remote IDMs with their detailed illustrations including both intelligent and signal processing‐based IDMs. Comparison of various IDMs based on their merits, demerits, and various performance analysis including the non‐detection zone, detection time, quality factor, power quality, effect on a microgrid, implementation cost, and applicability in multi‐DG system is provided. Hence, this review will provide an insight for the new researchers interested in the area highlighting the different islanding detection techniques with their relative merits and demerits.

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Section: Active Idmsmentioning

confidence: 99%

A comprehensive review on intelligent islanding detection techniques for renewable energy integrated power system

Panigrahi

Bhuyan

Shukla

et al. 2021

Intl J of Energy Research

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“…Detection of an islanding condition by monitoring the grid impedance variation is a very effective active AIP technique [19], [24]. The impedance variation is obtained by a perturbation method where a harmonic current (i h,i ) or voltage (v h,i ) signal is injected at the PCC, and the impedance is obtained from responses of the corresponding harmonic voltage (v h,r ) or current (i h,r ) with respect to injected signal as…”

Section: A Analytical Modeling Of the Aip Implementationmentioning

confidence: 99%

An Anti-Islanding Protection for VSM Inverters in Distributed Generation

Ամին

Zhong

Lyu

2020

IEEE Open J. Power Electron.

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Virtual synchronous machine (VSM) technology is an attractive control method for an inverterbased distributed generation (DG) due to having the voltage, and frequency support functionality. Embedding an anti-islanding protection (AIP) scheme with a high accuracy is a requirement for DG inverters due to the safety concern of the personnel, and hazardous operation. This paper presents a novel hybrid AIP scheme for VSM inverters for integration of DG sources into the grid. The main advantage of this AIP scheme is that the proposed scheme can be embedded into the control of the DG inverters without a need of additional part in the hardware of the inverter, and any change in the controller. A detailed modeling of its implementation with the inverter control is presented, and the performance of the AIP scheme is verified by simulations, and experiments. It is shown that the AIP scheme detects the islanding condition successfully, and isolates the inverter from the grid after it experiences an islanding condition.INDEX TERMS Anti-islanding protection scheme, distributed generation, inverter, pv integration, robust droop controller.

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“…However, literature [27][28][29][30] only validates IDMs in single-PV grid-connected system. Literature [31] presents an active method based on the DC/DC injection. The islanding detection scheme is formed by estimation of the difference of high frequency impedance before and after the islanding.…”

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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Islanding detection method of multi‐port photovoltaic DC micro grid based on harmonic impedance measurement

Cited by 30 publications

References 38 publications

A comprehensive review on intelligent islanding detection techniques for renewable energy integrated power system

A comprehensive review on intelligent islanding detection techniques for renewable energy integrated power system

An Anti-Islanding Protection for VSM Inverters in Distributed Generation

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

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