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Using the Hamiltonian function method,this paper proposes a family of robust adaptive excitation controllers for synchronous generators with steam valve control.First,a parameterization method of robust adaptive controllers is investigated for dissipative Hamiltonian systems.This method avoids solving Hamilton-Jacobi-Issacs inequalities.The parameters in the family of controllers thus obtained are determined by a locally positive semidefinite function,which has only 2n independent variables,twice as many as the one used to characterize the state feedback.Then,with the parameterization method and the structural properties of dissipative Hamiltonian systems,a family of robust adaptive excitation controllers is designed for synchronous generators with steam valve control,disturbances and unknown parameters.Simulations illustrate the effectiveness and feasibility of the excitation control strategy proposed in the paper.