The problems of robust H∞ guaranteed cost control and feedback stabilization for a class of uncertain switched
singular systems with time-varying delay are studied based on the Lyapunov function approach and convex combination
techniques. A sufficient condition for the existences of robust H∞ guaranteed cost controller and switching strategy are
given, and the designed state feedback controllers in terms of linear matrix inequality ensure that the closed-loop systems
satisfy the guaranteed cost index with a presented H∞ disturbance attenuation level r. Finally, an illustrative example shows
the effectiveness of the proposed method.