New islanding detection method for DFIG wind turbines

Islanding detection and anti-islanding protection is one of the most main protection requirements of grid connected wind turbines. This paper investigated a new islanding detection algorithm for wind turbine, which is combining the ROCOF relays and the Total Harmonic Distortion (THD) of wind turbines phase currents algorithms. The THD of wind turbines phase currents method is introduced as interlock function which can avoid false operation during system non-islanding situation (load adding). Also noise and non-linear load are added into the system to provide a more realistic system, the results shows that ROCOF relays can operate effectively during system with noise and non-linear load.