PBC Approach Applied on DC-DC Step-Down Converters for Providing Service to CPLs

OSCAR MONTOYA ; WALTER GIL-GONZÁLEZ; FEDERICO SERRA; GUILLERMO MAGALDI

Medellin

Congreso; 4th IEEE Colombian Conference on Automatic Control (CCAC); 2019

IEEE

This paper addresses the problem of output voltage regulation for step-down converters (buck converters) for constant power load (CPL) applications. The model of the CPL corresponds to a hyperbolic constraint that introduces nonlinearities on the dynamical model. To regulate the voltage profile in this nonlinear load a passivity-based control (PBC) control approach is proposed. The main advantage of the proposed control approach corresponds to the parametric Independence of the controller, even if the CPL is unknown as well as the possibility of guaranteeing asymptotic stability in the sense of Lyapunov. Numerical results validate the proposed control approach in comparison with conventional PID controller.