Improved control scheme of a dual star induction generator integrated in a wind turbine system in normal and open-phase fault mode

A robust control scheme of a wind turbine system (WTS) based on a dual star induction generator (DSIG) in normal and open-phase fault (OPF) mode is presented in this paper. The strong point of this generator that recently attracted the attention of several researchers especially in wind energy field is that it combines the advantages of the squirrel cage induction machine and those of multiphase ones. This research is carried out to reach two main objectives. Firstly, in order to ensure a robust control of the DSIG-based WTS with a low effect of chattering phenomenon, an improved control scheme based on super-twisting continuous sliding mode controllers (STCSMC) is proposed. The second objective is to verify, by an OPF test, the ability of the DSIG to operate in degraded conditions. Finally, simulated results show that more robust control is achieved and that the DSIG-based WTS continues to provide suitable electrical energy to the grid without remarkable effects.