Sensorless Control of Brushless Doubly Fed Induction Generator with Nonlinear Loads for Stand-Alone Power Generation Systems

Figure 9

Test results of the rotor speed observer without the PW harmonic-voltage controller being activated. (a) PW voltage (1 p.u. = 500 V) and CW current (1 p.u. = 60 A). (b) Detailed view of (a). (c) Rotor speeds observed by the basic and improved observers. (d) Rotor speed errors of the basic and improved observers.

(a)

(b)

(c)

(d)