Islanding Detection Methods

Identification: “Review and Simulation Islanding detection methods – Validation on a dedicated mock-up”


  • Review of islanding detection methods used in converter
  • Comparison of methods through simulation
  • Validation of dynamic behavior with a dedicated test bench

Main characteristics of the test bench:

  • Objective: simulate an islanding situation on an open inverter
  • Test islanding algorithms with different local loads (RLC and Asynchronous machine)

Experimental bench scheme

Period: from 2014 to 2016

Sponsors: EDF

Context: Distributed generation, islanding protection

Main results:

  • Comparisons of different islanding detection methods
  • Experimental validation on a dedicated mock-up


  • EDF 
  • L2EP

Power Quality Assessment of Photovoltaic Micro-Inverters

Identification: “Operation modes and Power Quality assessment of photovoltaic micro-inverters”

Aims :

  • Study the behavior of photovoltaic micro-inverters (power rating from 250W to 500W)
  • These kind of inverter is used to interconnect one or two photovoltaic panels.
  • The objectives of this study is to test micro-inverters from different manufacturers in both the normal and degraded  modes of operation.
  • This work has been focused on the limits of   normal operation and Power Quality studies.

Period: from 2016 to 2017


Context: Micro-inverter is the youngest solar inverter technology. The main argument in favor of the use of micro-inverters is that their connection is easy and allows to have “plug & play” PV modules. Also, the growth of this market is based on the capacity of low skilled workers to realize PV installations. Moreover, the number of micro-inverter manufacturers is rising since the last three years. Thus, it is difficult to compare the product among themselves.

Main results:

  • Develop a PV micro-inverter test bench
  • Results comparison to manufacturer data
    • power measurements at 10%,20%,30%,50% and 100% of the rated Power
    • Efficiency and EU efficiency computations
    • Minimum and maximum AC voltage protection testing
    • Minimum and maximum frequency protection testing
    • Islanded mode operation on a  RLC load
    • To check the micro-inverter behavior during power quality studies in the case of harmonic voltages in the AC grid. Power quality measurements like:


  • Partner n ° 1 (Pilot):   Laboratoire L2EP in Lille / Arts et Métiers ParisTech – Lille, 8 Boulevard Louis XIV – 59000 LILLE (France)
  • Partner n ° 2:  Laboratoire L2EP in Lille / Ecole centrale de Lille,  Cité Scientifique, 59651 Villeneuve-d’Ascq