Robust direct torque and flux control of adjustable speed sensorless induction machine drive based on space vector modulation using a PI predictive controller |
| |
Authors: | G R Arab Markadeh J Soltani |
| |
Affiliation: | (1) Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan, Iran |
| |
Abstract: | A Direct torque and flux control design for a sensorless induction motor, following a Lyapunov-based stator flux observer
is presented. In this control scheme, the torque error signal and the amplitude of the stator flux reference vector are delivered
to a PI predictive controller. The predictive controller also uses information on the amplitude and position of the actual
stator flux vector and measured stator currents to determine the voltage command vector for space vector modulation inverter.
In addition, a conventional PI speed controller is used to generate the torque reference signal. Using the fifth order model
of the three-phase induction machines in a stationary two axes reference frame, a nonlinear stator flux observer is developed
in order to estimate the rotor speed, rotor and stator resistances simultaneously. The stability of this observer is proved
by Lyapunov theory. It is shown that if the persistancy of excitation condition is satisfied, the estimated quantities converge
to their real values. The effectiveness of the proposed control scheme is verified by computer simulation and experimental
results. |
| |
Keywords: | Direct torque control Speed sensorless Nonlinear stator flux observer Parameter variation |
本文献已被 SpringerLink 等数据库收录! |