Nonlinear sensorless control of doubly fed induction generator in wind power generation

An Adaptive Nonlinear Sensorless Controller of Doubly Fed Induction Generator Driven By Wind Turbine

“…8 ( s m mean value as depicted in Figure 3. To show the robustness of the proposed adaptive sensorless controller against the aerodynamic torque and the rotor winding resistance variation the tracking performance for both the sensorless controller with [24] and without adaptation at constant wind speed ) / 9 ( s m has been compared in Figure 4. The simulation is performed with the variation of the mechanical torque and the rotor winding resistance described by: Figure 3 (c) shows a good tracking performance of the stator quadratic current.…”

“…Similarly, from Figure 3(e) it can be observed that the estimated rotor resistance quickly converges to its true profiles. In Figure 4 the adaptive nonlinear sensorless controller performance is shown by the comparison of the proposed adaptive sensorless and the sensorless controller proposed in [24]. From Figures 4 (a) and 4 (b) it is noted that the stator flux and the rotor speed tracking errors sustain small perturbations caused by the unknown rotor resistance and the unknown aerodynamic torque, but they converge to zero quickly as soon as the estimates of r R , and When the actual values do not correspond to their references, the closed loop system is exposed to failure, which destroys the control objectives.…”

“…We define the update laws of the additional term and the aerodynamic torque as (24) with tM T is the upper bound value of t T and 2  is an arbitrary positive constant. Substituting (18), (19), (21), (22) and (23) in (16), the time derivative of (15) becomes:…”