Islanding Detection Calculator

Calculate non-detection zone (NDZ) parameters for anti-islanding protection in grid-tied solar PV inverters.

Input Parameters

Results

--
Power Mismatch
%
--
Non-Detection Zone
%
--
Est. Detection Time
s
--
Recommended Method
Note: IEEE 1547 requires anti-islanding detection within 2 seconds. The non-detection zone is smallest with large power mismatch. Active methods (frequency shift, impedance measurement) are more reliable than passive.

Reference

Power Mismatch = (PV - Load) / PV x 100 NDZ = (1/Q_load) x 100 x (f_trip/60) Detection Time depends on mismatch magnitude: >5% mismatch: ~0.1s, >2%: ~0.5s, <2%: ~2.0s Active methods needed for high-Q loads