Position Sensorless Deadbeat Power Control of Doubly-fed Induction Generator Based on MRAS Observer

Deadbeat power control (DBPC) is an effective approach to achieve accurate and quick power control for doubly-fed induction generator (DFIG) systems. The desired rotor voltage vector reference can be directly calculated based on the DFIG mathematical model in DBPC. And space vector modulation (SVM) is utilized to synthesis the rotor voltage reference. Satisfactory steady state performance and dynamic responses can be obtained using this method. However, in conventional DBPC, the information of rotor speed and position is obtained from speed transducer and position encoder, which increases the overall cost and reduces the robustness of system. This paper presents a position sensorless technique based on model reference adaptive system (MRAS) and integrates it with DBPC to achieve position sensorless operation. The proposed method is robust against the rotor speed variation, even when the rotor speed of DFIG changes from subsynchronous speed to super-synchronous speed. The effectiveness of the proposed DBPC with MRAS observer is confirmed by the presented simulation results from a 1500 W DFIG system.