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High performance Direct Power Control for a doubly fed induction generator

This paper aims to develop an effective Direct Power Control (DPC) technique for a doubly fed induction generator. The proposed DPC scheme achieves a decoupled control of stator active and reactive powers by choosing, step-by-step, the optimum voltage vector to be delivered by the rotor side voltage source inverter. A robust approach for sensorless estimation of speed and rotor position is presented using a Model Reference Adaptive System observer. The paper firstly introduces a precise description of the theoretical principle of the DPC algorithm. Then the implementation is illustrated. Drive performance is predicted by simulation and experimentally verified by using a prototyping digital test rig. Results confirm the effectiveness of the proposed approach, giving improved drive performance with respect to previous experiments, in particular avoiding some disadvantages of classic DPC techniques.