Islanding detection techniques for grid-connected photovoltaic systems-A review

The awareness concerning the grid connected Photovoltaic (PV) has become vital and a major concern nowadays. Islanding detection is one of the most dominant challenges for distributed generation system connected to the utility grid. In addition, islanding has not been a preferable option as it may pose safety hazard and may cause damage to power generation and power supply facilities as a result of unsynchronized re-closer. Therefore, the islanding detection techniques are needed to ensure safe and reliable system operation. One of the established islanding prevention methods is the Slip Mode Frequency Shift (SMS) islanding method, which has numerous advantages over the other techniques. This paper investigates the active islanding detection methods and specifically focused on the SMS islanding method. The results show that the SMS islanding method successfully detected an unintentional fault and managed to isolate the system within the prescribed time range.

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Grid Synchronization and Islanding Detection Methods for Single-Stage Photovoltaic Systems

Energies ◽

10.3390/en13133382 ◽

2020 ◽

Vol 13 (13) ◽

pp. 3382 ◽

Cited By ~ 4

Author(s):

Rosa Anna Mastromauro

Keyword(s):

Control Function ◽

Single Stage ◽

Detection Methods ◽

Photovoltaic Systems ◽

Islanding Detection ◽

Safe Operation ◽

Synchronization System ◽

Grid Synchronization ◽

High Power Factor

Synchronization and islanding detection represent some of the main issues for grid-connected photovoltaic systems (PVSs). The synchronization technique allows to achieve PVS high power factor operation and it provides grid voltage monitoring. The islanding detection control function ensures safe operation of the PVS. Focusing on low-power single-stage PVSs, in this study the most adopted and the highest performance synchronization and islanding detection methods are discussed. The role of the synchronization system is fundamental to detect the grid conditions, for the islanding detection purpose, and to manage the reconnection to the grid after a PVS trip. Hence a combined review is advantageous.

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A Survey of Islanding Detection Methods for Microgrids and Assessment of Non-Detection Zones in Comparison with Grid Codes

Energies ◽

10.3390/en15020460 ◽

2022 ◽

Vol 15 (2) ◽

pp. 460

Author(s):

José Antonio Cebollero ◽

David Cañete ◽

Susana Martín-Arroyo ◽

Miguel García-Gracia ◽

Helder Leite

Keyword(s):

Detection Methods ◽

Normal Operation ◽

Islanding Detection ◽

Personal Safety ◽

Detection Zone ◽

Detection Techniques ◽

Advantages And Disadvantages ◽

Grid Codes ◽

Utility Grid

Detection of unintentional islanding is critical in microgrids in order to guarantee personal safety and avoid equipment damage. Most islanding detection techniques are based on monitoring and detecting abnormalities in magnitudes such as frequency, voltage, current and power. However, in normal operation, the utility grid has fluctuations in voltage and frequency, and grid codes establish that local generators must remain connected if deviations from the nominal values do not exceed the defined thresholds and ramps. This means that islanding detection methods could not detect islanding if there are fluctuations that do not exceed the grid code requirements, known as the non-detection zone (NDZ). A survey on the benefits of islanding detection techniques is provided, showing the advantages and disadvantages of each one. NDZs size of the most common passive islanding detection methods are calculated and obtained by simulation and compared with the limits obtained by ENTSO-E and islanding standards in the function of grid codes requirements in order to compare the effectiveness of different techniques and the suitability of each one.

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