Islanding detection technology for grid-connected wind based distributed generation

The islanding operation of DG usually occurs when the wind plant that is the source in the DG, still makes a section of the page distribution according to this section has been disconnected from the service program source. Distribution of the feeder islands with power DG are usually not required. In the proposed method, the q-axis current in the inverter is measured and the current controller is modeled with a continuous periodic Reference power from a small value. The possibility of false detection is eliminated through the affirmation of the occurrence of islanding as soon as it is suspected. DG is a islanded from the upstream system, if the frequency variation is occur in a small value due to a change in the inverter current. The proposed algorithm detects the island grid formation in the stable condition of the system. Computer simulation is done with MATLAB.