Stratégie de commande pour un système de conversion de l´énergie éolienne à vitesse variable

Discusses a method of calculating an optimal control strategy for a variable speed wind power generation scheme, incorporating a squirrel cage induction machine, operating in a self excited induction generator mode. This scheme also uses a conventional three phase thyristor rectifier, a line commutated inverter and an economical auxiliary commutated voltage source inverter. The three regulated variables are: drive speed as a function of available mechanical energy by manipulating the resistive torque developed by induction generator; induction motor power consumption during startup of the wind machine of vertical axis type: and operating slip of induction machine, thereby limiting start-up and braking currents. The developed strategy is also suitable for any other variable speed drive system incorporating an induction machine.