An Improved Islanding Detection Method for Photovoltaic Grid-Connected System
Islanding detection is a very essential function for a photovoltaic grid-connected system. Islanding phenomenons not only damage to equipment, but also endanger to the safety of the maintenance personnel. Passive islanding detection methods that use alone have considerable non-detection zone (NDZ); active islanding detection methods that use alone are that join disturbance to system, but the disturbance will cause system instability . In this paper, an over/under voltage and over/under frequency detection method combines with an improved active power perturbation detection method are proposed. The photovoltaic system can be reduced non-detection zone (NDZ) with improved the power quality and reduced the total harmonic distortion (THD) through this method.
C. X. Li and Q. P. Yuan, "An Improved Islanding Detection Method for Photovoltaic Grid-Connected System", Advanced Materials Research, Vol. 748, pp. 453-456, 2013