Short-circuit contributions of full converter wind turbines

Full converter wind turbines respond differently than directly-connected machines to short circuits. 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 machines do. Also, they do not have a sequence representation in the negative and zero sequences, except as very large equivalent impedances. Modeling of these wind turbines may require modification of existing short circuit programs, which are based on the characteristics of synchronous machines, but the converters can be analyzed in similar manner.