anti-Islanding Detection
The islanding phenomenon for grid- connected PV systems occurs when the PV inverter does not disconnect after the grid has tripped and continues to provide power to the local load. In the conventional case of a residential electrical system cosupplied by a roof- top PV system, the grid disconnection can appear as a result of a local equipment failure detected by the ground fault protection or of an intentional dis- connection of the line for servicing. In both situations, if the PV inverter does not disconnect, some hazardous situations can occur, such as
■ retripping the line with an out-of- phase closure, damaging some equipment
■ a safety hazard for utility line workers who assume that the lines are de-energized.
To avoid these serious situations, safety measures and detection methods called anti-islanding requirements have been required in standards. In IEEE 1574, it is defined that after an unintentional is- landing where the PV system continues to energize a portion of the power sys- tem (island) through the point of common coupling, the PV system shall detect the islanding and stop to energize the area within 2 s.
anti-Islanding Detection The islanding phenomenon for grid- connected PV systems occurs when the PV inverter does not disconnect after the grid has tripped and continues to provide power to the local load. In the conventional case of a residential electrical system cosupplied by a roof- top PV system, the grid disconnection can appear as a result of a local equipment failure detected by the ground fault protection or of an intentional dis- connection of the line for servicing. In both situations, if the PV inverter does not disconnect, some hazardous situations can occur, such as ■ retripping the line with an out-of- phase closure, damaging some equipment ■ a safety hazard for utility line workers who assume that the lines are de-energized. To avoid these serious situations, safety measures and detection methods called anti-islanding requirements have been required in standards. In IEEE 1574, it is defined that after an unintentional is- landing where the PV system continues to energize a portion of the power sys- tem (island) through the point of common coupling, the PV system shall detect the islanding and stop to energize the area within 2 s.
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