Exponential Active Anti-Islanding Method and Device

A device and method based on an active anti-islanding technique for distributed power generator systems. The present invention is based on the Sandia Voltage Shift (SVS) technique, which is characterized by a small non- detection zone (NDZ) and an acceptable trade-off between output power quality and islanding detection efficiency. The present invention has the advantage of improving the NDZ and reducing island detection times. This is due to the modification of the exponential product made in the positive feedback to inject current, which makes the response faster than SVS. In addition, a self-adaptive gain is considered to achieve low total harmonic distortion (THD) at different power levels.