Short-circuit contributions of full-converter wind turbines

Full converter wind turbines respond somewhat differently than directly-connected machines to short circuit conditions. In distinction with directly-connected machines, full-converter wind turbines have a controlled response to system short circuits. Consequently, they do not behave quite like a voltage behind a reactance, as conventional synchronous or asynchronous machines do. Also, they do not have negative or zero sequence impedances in the same sense as machines. Correct modeling of these wind turbines may require some modification of existing short circuit programs, which are based on the characteristics of synchronous machines.