Stabilizing Dynamic Controllers for Hybrid Systems: A Hybrid Control Lyapunov Function Approach

Stefano Di Cairano, W. P. Maurice H. Heemels, Mircea Lazar, Alberto Bemporad
2014 IEEE Transactions on Automatic Control  
This paper proposes a dynamic controller structure and a systematic design procedure for stabilizing discrete-time hybrid systems. The proposed approach is based on the concept of control Lyapunov functions (CLFs), which, when available, can be used to design a stabilizing state-feedback control law. In general, the construction of a CLF for hybrid dynamical systems involving both continuous and discrete states is extremely complicated, especially in the presence of non-trivial discrete
more » ... al discrete dynamics. Therefore, we introduce the novel concept of a hybrid control Lyapunov function, which allows the compositional design of a discrete and a continuous part of the CLF, and we formally prove that the existence of a hybrid CLF guarantees the existence of a classical CLF. A constructive procedure is provided to synthesize a hybrid CLF, by expanding the dynamics of the hybrid system with a specific controller dynamics. We show that this synthesis procedure leads to a dynamic controller that can be implemented by a receding horizon control strategy, and that the associated optimization problem is numerically tractable for a fairly general class of hybrid systems, useful in real world applications. Compared to classical hybrid receding horizon control algorithms, the proposed approach typically requires a shorter prediction horizon to guarantee asymptotic stability of the closed-loop system, which yields a reduction of the computational burden, as illustrated through two examples. Index Terms-Control lyapunov functions, hybrid systems stability, receding horizon control.
doi:10.1109/tac.2014.2324111 fatcat:hmqmydeyhbhb5cpyd6e5ne3bgm