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The use of PI controllers for speed control of induction machine drives is characterised by an overshoot during start up with a poor load disturbance rejection. To overcome this problem we propose the use of an original variable gain PI (VGPI) speed controller. Each gain value of the proposed controller vary along an appropriate polynomial curve from a start up setting that permits overshoot elimination,...
In this paper, a speed-adaptive full-order flux observer for sensorless vector control of doubly-fed induction generators (DFIGs) is proposed. The observer is a simulation of the full-order electrical model of DFIGs with feedback of the rotor current estimation error and a speed adaptation loop. The observer gains are selected based on a stability analysis and validated by the linearized closed-loop...
This paper demonstrates that invariant regulator and superior servo performance can be obtained, compared to fixed gain controllers, through sliding mode speed control of a decoupled induction machine. The speed control scheme consists of a standard indirect vector control implementation for torque control, with a sliding mode speed controller. Assuming the bounds on the parameter variations are known,...
In this document a new proposal of speed vector control of induction motors based on robust adaptive VSC (variable structure control) law and its experimental validation are presented. This control scheme uses the SVPWM (space vector pulse width modulation) instead of the traditional current hysteresis comparator, because the space vector modulator eliminates the instability risk when the motor works...
The design of a speed sensorless PWM robust control scheme for an induction motor drive in order to control the rotor speed is proposed. The proposed design is divided in two parts. In the first one it is designed a speed estimator to estimate the rotor speed. In the second one it is developed the proposed robust control. This robust control comprises two parts, the so called inverse dynamic technique...
Field-oriented control of induction machines is widely used in high-performance applications. However, detuning caused by parameter disturbances still limits the performance of these drives. In order to accomplish variable speed operation conventional PID-like controllers are commonly used. These controllers provide limited good performance over a wide range of operation, even under ideal field oriented...
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