On non-local stability properties of extremum seeking control. (English) Zbl 1117.93362
Summary: We consider several extremum seeking schemes and show under appropriate conditions that these schemes achieve extremum seeking from an arbitrarily large domain of initial conditions if the parameters in the controller are appropriately adjusted. This non-local stability result is proved by showing semi-global practical stability of the closed-loop system with respect to the design parameters. We show that reducing the size of the parameters typically slows down the convergence rate of the extremum seeking controllers and enlarges the domain of the attraction. Our results provide guidelines on how to tune the controller parameters in order to achieve extremum seeking. Simulation examples illustrate our results.
MSC:
| 93D09 | Robust stability |
| 93C10 | Nonlinear systems in control theory |
| 93C15 | Control/observation systems governed by ordinary differential equations |
| 93C70 | Time-scale analysis and singular perturbations in control/observation systems |
Keywords:
extremum seeking control; semi-global practical stability; convergence speed; domain of the attractionReferences:
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