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Disturbance rejection via feedforward compensation using an enhanced equivalent-input-disturbance approach. (English) Zbl 1450.93011
Summary: This paper presents an enhanced equivalent-input-disturbance (EID) approach that provides an additional degree of freedom to reject an exogenous disturbance for a control system. The EID approach uses a state observer and an estimator to calculate an equivalent disturbance on the control input channel for feedforward compensation. However, there is a constraint on the design of the state observer in an EID-based control system. This imposes a limitation on control performance. A high-gain observer (HGO) is employed to remove the constraint. This increases the flexibility of system design and improves disturbance-rejection performance. The convergence of the HGO is analyzed and the system is separated into two subsystems for stability analysis and design. A numerical example is used to show the validity of the method. The simulation results show that the disturbance is mainly rejected by feedforward compensation rather than feedback control.
93B35 Sensitivity (robustness)
93B53 Observers
93D05 Lyapunov and other classical stabilities (Lagrange, Poisson, \(L^p, l^p\), etc.) in control theory
Full Text: DOI
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