A Communication Based Islanding Detection Method for Photovoltaic Distributed Generation Systems

Table 1

Current standards for islanding detection.

	IEC 62116	IEEE 1547	IEEE 929	Japan
Quality factor	1	1	2.5	0
Detect. time	𝑡 < 2 s	𝑡 < 2 s	𝑡 < 2 s	Passive: 𝑡 < 0.5 s
				Active: 0.5 < 𝑡 < 1 s
Allowed frequency range	𝑓0 − 1.5 Hz	59.3 Hz	59.3 Hz	Selected value
	𝑓0 + 1.5 Hz	60.5 Hz	60.5 Hz
Allowed voltage range	𝑉≤0.85𝑉0	𝑉≤0.88𝑉0	𝑉≤0.88𝑉0	Selected value
	𝑉≥1.15𝑉0	𝑉≥1.10𝑉0	𝑉≥1.10𝑉0