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There are two control objectives in active rectifiers: DC regulation and power factor correction, however it is difficult to reach both objectives simultaneously. In this paper is presented the use of an observer based control for complete both control objectives. A proporcional integral (PI) control is applied to regulate DC voltage and a hysteresis based control for improve the power factor. Experimental...
Unknown input observers (UIO) are able to estimate perfectly the state of a system, despite completely unknown input perturbations. In this paper the experimental evaluation of an unknown input observer suitable for flux estimation for induction motors taking the load torque as unknown input is presented. Experimental results on a semi-industrial setup are given.
The problem of tracking in a second order nonlinear uncertain servo is addressed. A proportional-derivative (PD) controller with uncertainty and feedforward compensation is proposed. Such a controller employs estimates obtained from an integral observer. Stability analysis in a Lyapunov sense for the closed-loop system is performed. Experiments are carried out on a laboratory prototype to validate...
This paper presents the design of a nonlinear robust observer for the estimation of the neutron precursor power and internal reactivity in a nuclear research reactor when only the input and the neutron power are available for measurement. The observer is based on a differential neural network with internal and external layers. Besides, this observer has two correction terms: Luenberger one and sliding...
In this work, the fault diagnosis problem for nonlinear systems is treated, some results based on a differential algebraic approach are used in order to determine fault diagnosability and one nonlinear observer using a sliding mode technique is given for estimating the faults, another nonlinear observer is also treated with the purpose of comparing results. An academic example is presented and faults...
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