Title :
Sensorless Vector Control of Induction Machine with Low Speed Capability using MRAS with Drift and Inverter Nonlinearities Compensation
Author :
Silva, César ; Araya, Ricardo
Author_Institution :
Univ. Tecnica Federico Santa Maria, Valparaiso
Abstract :
The performance of sensorless vector control schemes is seriously degraded at low speed operation, becoming impossible to operate constantly at standstill. There are three main reasons for this degradation in low speed senseless performance. First, offset on the estimation of the back-EMF that causes drift in the open integration of the stator model of the machine. Second, unaccounted nonlinearities of the inverter distort the back-EMF estimation. Finally, errors on the estimated machine parameters, mainly stator resistance cause phase error on the back-EMF estimation. This paper deals with the first two phenomenon to achieve sensorless stator flux orientation and speed feedback by means of an MRAS observer, down to fractions of a Hertz.
Keywords :
asynchronous machines; compensation; machine control; model reference adaptive control systems; nonlinear control systems; observers; vectors; MRAS observer; back-EMF estimation; drift nonlinearity compensation; induction machine; inverter nonlinearity compensation; model reference adaptive system; sensorless vector control; stator resistance; Current measurement; Degradation; Feedback; Induction machines; Inverters; Machine vector control; Phase estimation; Sensorless control; Stators; Voltage; AC machines; sensorless control; vector control;
Conference_Titel :
EUROCON, 2007. The International Conference on "Computer as a Tool"
Conference_Location :
Warsaw
Print_ISBN :
978-1-4244-0813-9
Electronic_ISBN :
978-1-4244-0813-9
DOI :
10.1109/EURCON.2007.4400662
