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A composite sliding mode field-oriented control (FOC) for linear induction motors (LIM) is developed in this paper. A new sliding-mode observer-controller scheme is designed to provide a line speed tracking, in which the observer can estimate the load thrust and feed back to controller for small switching gain of sliding mode controller. The control scheme also incorporates super-twisting sliding...
A nonlinear robust observer based controller design for twin rotor control system (TRCS) is demonstrated in this paper. The TRCS is an uncertain system with high nonlinearity and strong coupling effects. The TRCS is a replication of a helicopter to some extent. Due to high coupling effect, the controller design of TRCS is challenging as well as interesting. As all the state variables of TRCS are unmeasurable,...
The rotor speed estimation problem in electrical drives, based on shaft encoder measurements, has been dealt with by means of a digital approximate differentiator. The proposed differentiator is based on a digital VSC which is able to perform real 2-sliding modes, so that the observer discontinuous control is confined to the second total derivative of the available encoder signal estimate, and its...
A novel composite control method based on disturbance observer for the precision suspension of a voltage-controlled active magnetic bearing (AMB) system is presented in this study. The voltage-controlled AMB system always suffers from the mismatched disturbances, which act on the system via different channels from the control inputs. In this study, we reconstruct a new system, which is equivalent...
Considers the power system has nonlinear and uncertain disturbance, a nonlinear controller is designed combined with extended state observer (ESO), back-stepping and sliding mode. The nonlinear extended state observer is applied to estimate and compensate uncertainties in real time, thus improved both robustness and adaptability. The controller can hold the power system stability on conditions of...
A vector control system of an induction motor is proposed to suppress influence of iron loss. It is pointed out that the rotor flux estimator contributes more to torque control linearity than the current controller. Therefore, it is proposed that a rotor flux observer which can suppress the influence of some parameter deviations, (especially that of rotor resistance), can be applied to decrease the...
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