Received: April 15, 2021. Revised: May 5, 2021. 299 International Journal of Intelligent Engineering and Systems, Vol.14, No.4, 2021 DOI: 10.22266/ijies2021.0831.27 Islanding Detection Method of a Photovoltaic Installation Destined to Power a RLC Load and Integrated to LV Network Fatima Chanaa 1 * Radouane N'ait Zarri 2 Rachid Bendaoud 1 Houssam Amiry 1 Elhadi Baghaz 1 Said Bounouar 1 Bouchaib Zohal 1 Charaf Hajjaj 3 Said Yadir 4 Abderrahim El-abidi 4 Mohammadi Benhmida 1 1 Laboratory of Electronics, Instrumentation and Energetic, Department of physics, Faculty of Sciences, Chouaïb Doukkali University, El Jadida, Morocco 2 OCP Group, Direction Jorf Nord, Technical Methods du site de Jorf Lasfar, El Jadida, Morocco 3 Laboratory of Applied Sciences for the Environment and Sustainable Development, Higher School of Technology of Essaouira, Cadi Ayyad University, Essaouira, Morocco 4 Laboratory of Materials, Processes, Environment and Quality, National School of Applied Sciences, Cadi Ayyad University, Safi, Morocco * Corresponding author’s Email: fatima.chanaa.ing@gmail.com Abstract: The islanding of grid-connected photovoltaic (PV) installations is a difficult problem that leads to many protection and security problems. A variety of islanding detection methods (IDMs) are proposed in several studies and these techniques are categorized into passive, active and communication based methods. This study describes the IDM adopted to detect islanding situation in the new PV installation connected to LVs grid of OCP Group (Cherifian Office for Phosphates in Morocco), global leader in the phosphate and phosphate derivatives markets. After having defined the way in which the PV generators will be integrated within the OCP Group grid, the causes that could lead to islanding situation are established. The comparison on the most used methods for islanding detection in the grid connected photovoltaic system (PV) is based on three parameters: the Non-Detection Zone (NDZ), the Detection Duration Time (DDT) and Total Harmonic Distortion (THD) of each method. These performance criteria are compared with the limit thresholds authorized by the IEEE 1574 standard, which are 5% for THD and 2 seconds for DDT. The Slip Mode Frequency Shift (SMS) method is demonstrated to be the most effective, for our installation, among the simulated methods, with THD and DDT of 1.3% and 0.28s, respectively. Keywords: Islanding detection, Photovoltaic installation, Non-detection zone, Total harmonic distortion. 1. Introduction More than seventeen Tera-watt-hour (TWh) is currently considered to be the total energy consumption in the world at any given point in time (Fig. 1), and it is expected to be twice as high by 2050 [1]. Since the demand is getting increasingly high, all kinds of energy are to be quickly increased in the coming years, for instance, solar photovoltaic (PV) Figure. 1 Evolution of world energy consumption (TWh)