This paper presents the voltage build up process and terminal voltage control in an isolated wind turbine powered induction generator driven by a variable speed wind turbine using rotor flux oriented vector control. Here three-phase induction generator is excited sing a PWM inverter/rectifier connected to a single capacitor on the DC side. Wind powered isolated induction generators have an input, wind, which is not controllable. Unlike a grid connected induction generator, in an isolated induction generator there should be a control system that keeps the DC bus voltage at a constant value when the speed of the rotor and the load are varied. The paper presents the control system to maintain the DC bus voltage at a constant value by varying the flux in the induction generator when the rotor speed is varied and also, to maintain the DC bus voltage at a constant value and the rotor flux in the induction generator when the load is varied. During voltage build up the variation of magnetizing inductance is taken into consideration.
- wind energy,
- induction machine
Available at: http://works.bepress.com/djamila_rekioua/3/