In this paper,the authors tackle a fixed-time average-tracking problem for multi-agent systems which do not require velocity measurements and are affected by external mismatched and matched *** objective requires the ...
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In this paper,the authors tackle a fixed-time average-tracking problem for multi-agent systems which do not require velocity measurements and are affected by external mismatched and matched *** objective requires the considered agents with second-order dynamics to follow the average value of several time-varying reference signals,each of which is acquired by only one *** of all,the average value is estimated by using a novel distributed average estimator in a fixed ***,an original observer is created to provide estimated values in a fixedtime for external mismatched and matched disturbances as well as unmeasured velocities of ***,the authors propose a novel fixed-time anti-disturbance average-tracking protocol with the aid of the observer and a sliding mode *** the end,the feasibility of theoretical analysis is illustrated by some simulation experiments.
A novel distributed-decentralized fixed-time optimal frequency and excitation (Di-De-FTOFE) control framework in a network-preserving power system with nonlinear power flow is proposed in this paper. Firstly, to obtai...
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A novel distributed-decentralized fixed-time optimal frequency and excitation (Di-De-FTOFE) control framework in a network-preserving power system with nonlinear power flow is proposed in this paper. Firstly, to obtain the solution of the economic dispatch (ED) problem, the proposed control framework contains the distributed fixed-time consensus-based optimal frequency (Di-FTCOF) control to make the Lagrange multiplier of each generation reach consensus in a fixedtime and the decentralized fixed-time excitation (De-FTE) control to ensure the power system frequency back to the rated value in a fixedtime for satisfying the load-generation balance constraints of ED problem. Secondly, the voltage dynamic also can be maintained around the rated value by the designed De-FTE control which owns good universality to coordinate other optimal frequency control methods. Thirdly, the Di-De-FTOFE control framework is robust to communication failure through the self-adaptive adjustment, which is both analyzed in the theoretical verification and simulation. Finally, the performance of the Di-De-FTOFE control framework is evaluated in simulation with several adverse situations, such as load decrease/increase and communication failure.
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