Improved voltage shift islanding detection method for multi‐inverter grid‐connected photovoltaic systems

Liu, Sijia; Zhuang, Shengxian; Xu, Quan; Xiao, Jian

doi:10.1049/iet-gtd.2015.1151

Cited by 48 publications

(37 citation statements)

References 26 publications

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“…In this sense, the frequency value can be used for signalling the transitions between CCM to VCM in the DERs. This kind of signalling strategy has been commonly used as a passive islanding detection method for triggering the transition of a microgrid between grid-connected to islanded operation [31], [32].…”

Section: Distributed Control Architecturementioning

confidence: 99%

A Communication-Less Distributed Control Architecture for Islanded Microgrids With Renewable Generation and Storage

Díaz

Vasquez

Guerrero

2018

IEEE Trans. Power Electron.

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For reliable operation of an islanded microgrid, at least one of its distributed resources should assume the responsibility of forming the off-grid power system. This responsibility is usually assumed by energy storage systems based on their capability of compensating the unbalance between generation and consumption. However, the storage units lose this capability when they reach the maximum and minimum limits of charge. Under these conditions, the regulation of the power grid may be assumed by another unit with enough capability or the power balance should be adjusted coordinately. This paper proposes a coordination architecture for islanded ac microgrids, which considers the appropriate charge profiles for battery-based energy storage systems. The architecture is based on distributed decisionmaking mechanisms, which use only local measurements for determining the operation mode of each unit independently. The coordination relies on a bus-signalling method, which enables the distributed units to have a global perception about the operation of the microgrid, without any communication infrastructure. The proposed architecture includes cooperative operation between distributed energy storage systems for achieving the equalization of the states of charge. Experimental results in a lab-scale microgrid with network configuration validate the proposed strategy under different operational conditions.

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Section: Distributed Control Architecturementioning

confidence: 99%

A Communication-Less Distributed Control Architecture for Islanded Microgrids With Renewable Generation and Storage

Díaz

Vasquez

Guerrero

2018

IEEE Trans. Power Electron.

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“…According to the above analysis, to eliminate the NDZ, the range of ∆f 0 can be set as follows: (27) With the mentioned parameters, if ∆f 0 is 0.2 Hz, the NDZ can be avoided. However, the larger ∆f 0 is, the higher the current distortion is.…”

Section: Elimination Of the Non-detection Zonementioning

confidence: 99%

Improved Three-Phase AFD Islanding Detection Based on Digital Control and Non-Detection Zone Elimination

et al. 2018

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This paper proposes an improved active frequency drift (AFD) islanding detection method of a three-phase inverter. Different than the existing single-phase AFD method, in the three-phase system, the disturbance is added to the phase angle, which takes part in coordinate transformation calculations. Thus, the frequency drift of the three-phase reference current can be realized by the disturbance of the phase angle. It is unnecessary to add frequency drift to each phase respectively with the proposed method, which can simplify the control system. Furthermore, the non-detection zone can be eliminated by updating certain parameters; therefore, the detection method is sensitive. In this paper, the application of the proposed method in a digital control system is discussed in detail. The non-detection zone is analyzed, and an elimination method is proposed. Finally, the simulation and experimental results are given to verify the theoretical analysis.

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“…Liu et al . proposed a detection method based on the pulse width modulation control principle, which can reduce the voltage amplitude at the common coupling point. At the same time, it has a small blind area and a good effect of island detection.…”

Section: Introductionmentioning

confidence: 99%

An active frequency drift method for island problem of grid‐connected photovoltaic power generation system

Zhou

Fang

2019

IEEJ Transactions Elec Engng

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Island problem in grid-connected photovoltaic power generation system has a large influence on the safety and reliability of system, which needs to be timely detected. In this article, the photovoltaic grid-connected generation and island problems were briefly introduced, and then active frequency drift (AFD) method for island detection was studied. It was found that AFD might affect the quality of output current. Therefore, an improved AFD method was proposed, which added a phase shift change to the original reference current. The simulation experiment suggested that the improved AFD method proposed in this article could detect the islanding problem in 0.1 s, and the total harmonic distortion of the output current was 1.62%, much less than that of the AFD method. The experimental results show that the improved AFD method has better performance in island detection, with high security and reliability, and is worth popularizing widely in photovoltaic grid-connected power generation systems.

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Improved voltage shift islanding detection method for multi‐inverter grid‐connected photovoltaic systems

Cited by 48 publications

References 26 publications

A Communication-Less Distributed Control Architecture for Islanded Microgrids With Renewable Generation and Storage

A Communication-Less Distributed Control Architecture for Islanded Microgrids With Renewable Generation and Storage

Improved Three-Phase AFD Islanding Detection Based on Digital Control and Non-Detection Zone Elimination

An active frequency drift method for island problem of grid‐connected photovoltaic power generation system

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