Design of a controller for tracking sinusoidal references with robustness to load disturbances

This paper provides a condition to compute the gains of a controller that ensures robust tracking of sinusoidal reference signals with respect to disturbances affecting the plant. The proposed design conditions are written as a convex optimization problem, easily solved by specialized programs. An example of application of the proposed controller for a plant given by an LC filter and a load modeled as a disturbance, which can describe the output stage of several power converters, illustrate good performance of the closed-loop system, with no need of previous knowledge of the load model neither measurement or estimation of the load current.