首页|Optimal Nonlinear Robust Sliding Mode Control of an Excitation System Based on Mixed H2/H∞ Linear Matrix Inequalities
Optimal Nonlinear Robust Sliding Mode Control of an Excitation System Based on Mixed H2/H∞ Linear Matrix Inequalities
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In this paper,an optimal nonlinear robust sliding mode control(ONRSMC)based on mixed H2/H∞ linear matrix inequalities(LMIs)is designed for the ex-citation system in a"one machine-infinite bus system"(OMIBS)to enhance system stability.Initially,the direct feedback linearization method is used to establish a mathematical model of the OMIBS incorporating uncer-tainties.ONRSMC is then designed for this model,employ-ing the mixed H2/H ∞ LMIs.The chaos mapping-based adaptive salp swarm algorithm(CASSA)is introduced to fully optimize the parameters of the sliding mode control,ensuring optimal performance under a specified condition.CASSA demonstrates rapid convergence and reduced like-lihood of falling into local optima during optimization.Fi-nally,ONRSMC is obtained through inverse transfor-mation,exhibiting the advantages of simple structure,high reliability,and independence from the accuracy of system models.Four simulation scenarios are employed to validate the effectiveness and robustness of ONRSMC,in-cluding mechanical power variation,generator three-phase short circuit,transmission line short circuit,and genera-tor parameter uncertainty.The results indicate that ONRSMC achieves optimal dynamic performance in various operating conditions,facilitating the stable oper-ation of power systems following faults.
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