Abstract
This paper proposes a framework of anti-windup active disturbance rejection control for the networked control systems (NCSs) subjected to actuator saturation. The sensor-to-controller network is considered where only one sensor can report its measurements at each transmission instant. Both the round-robin and try-once-discard protocols are applied, respectively, to determine which sensor should be given the access to the network at a certain instant. To reflect the impact of communication constraints, a nonlinear sampled-data extended state observer (NSESO) is employed to estimate the states and ignored nonlinearities of the addressed system. Then, a composite control strategy with an anti-windup compensator is designed based on the NSESO, and the effects of actuator saturation is eliminated by the anti-windup compensator. The sufficient conditions to guarantee the convergence of the NSESO are provided, and then the input-to-state stability of the overall NCSs is given as well. Finally, a numerical example is introduced to demonstrate the effectiveness of the proposed design technique.
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This work was funded by the National Natural Science Foundation of China (Grant Number 11572248).
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Appendix
Appendix
The positive definite function \(V_{11}(t)\) is designed by
where
is the definite solution of Lyapunov equation \(P_{1}\varLambda +\varLambda ^\mathrm{T}P_{1}=-\,0.1*I_{2}\) for
where \(I_{1}\) and \(I_{2}\) represent the three-order and nine-order identity matrices, respectively. Moreover, MATLAB is used to calculate the eigenvalues of \(P_{1}\) and get nine eigenvalues as follows:
From (68), the positive definite function \(V_{11}(t)\) can be rewritten as
Then we have
One immediately obtains
Thus, the following inequalities are obtained as
and
Denote \(\lambda _{11}\triangleq \lambda _{\min }(P_{1})\triangleq 0.0199\), \(\lambda _{12}\triangleq \lambda _{\max }(P_{1})\triangleq 0.2849\), \(\lambda _{13}\triangleq 0.09\), \(\lambda _{14}\triangleq 0.1\), \(\hbar _{1}\triangleq \sqrt{0.1612}\) and \(\hbar _{2}\triangleq \sqrt{0.21}+\sqrt{0.06}+\sqrt{0.1612}=1.1047\). So the positive definite functions \(V_{11}(t)\) and \(W_{11}(t)\) are defined by (68) and (69), respectively, and the conditions in Assumption 1 are satisfied.
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Yu, Y., Yuan, Y., Yang, H. et al. Nonlinear sampled-data ESO-based active disturbance rejection control for networked control systems with actuator saturation. Nonlinear Dyn 95, 1415–1434 (2019). https://doi.org/10.1007/s11071-018-4636-9
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DOI: https://doi.org/10.1007/s11071-018-4636-9