OPTIMAL PERFORMANCE OF DOUBLE OUTPUT INDUCTION GENERATOR USED IN WECS

In this paper a new technique for optimizing the power generated by a double output induction generator (DOIG) is established. The proposed control strategy ensures stable operation of the DOIG within a wide sp eed range without overheating the machine. The proposed scheme employe d a controllable rectifier, a d.c. link, an inverter, and an isolating transformer in the rotor circuit. Variation of firing angles, overlap angle, voltages, and powers with speed are deduced. Experimental resu lts are given. Results showed that twice the rated machine power is ge nerated at S=-1.