This paper proposes a self-tuning closed-loop flux observer, which provides field-oriented torque control for induction machines without a tachometer. The proposed algorithm combines the best features of harmonic detection and stator voltage integration through the use of a new tuning scheme. The observer accuracy and robustness is augmented by a parameter-independent accurate-speed detector, which analyzes magnetic saliency harmonics in the stator current. The harmonic-detection scheme provides accurate rotor-speed updates during steady-state operation down to 1-Hz source frequency. This additional speed information is used to tune the rotor-resistance parameter of the observer. The tuned observer exhibits improved dynamic performance, accurate steady-state speed control and an extended range of control near zero speed. The algorithm requires no special machine modifications and can be implemented on most existing low- and medium-performance drives. The closed-loop nature of the flux observer, combined with the harmonic-detection scheme, provides flux and speed error feedback, which significantly increases the robustness of sensorless control across the entire speed range.
A self-tuning closed-loop flux observer for sensorless torque control of standard induction machines / K.D. HURST; T.G. HABETLER; G. GRIVA; F. PROFUMO; P.L. JANSEN. - In: IEEE TRANSACTIONS ON POWER ELECTRONICS. - ISSN 0885-8993. - 12:5(1997), pp. 807-815.
|Titolo:||A self-tuning closed-loop flux observer for sensorless torque control of standard induction machines|
|Data di pubblicazione:||1997|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1109/63.622998|
|Appare nelle tipologie:||1.1 Articolo in rivista|