Experimental evaluation of an adaptive nonlinear controller for single-phase UPS

A previously reported (Campos-Canton and Espinosa-Perez, 1999) control law that solves the output voltage control problem for a single-phase voltage-source UPS inverter is experimentally evaluated. The adaptive nonlinear controller was developed considering a half-bridge DC-AC power converter connected to a (linear) resistance load. The evaluation procedure considers the following topics: verification of the stability and convergence theoretical properties, evaluation of the dynamic practical response, disturbance (load change) rejection capability, behavior under low size (and then cost) passive elements and (relative) low switching frequency. It is shown that the controller under study satisfies in a remarkable way all the above evaluation criteria.