Comparison analysis of resonant controllers in discrete domain taking into account the computational delay

This paper presents the study, analysis and design of proportional-resonant classic (classic PR) and vector-resonant (VR) controllers. The vector resonant controller is more robust to parametric and frequency variations than the classic PR. This becomes more significant in applications that require selective harmonics compensation, since the increasing the order of frequency to be compensated decreases the system performance for both controllers. This situation is aggravated when the design is carried out in the discrete domain due to the effect of computational delay. Thus, in this paper it will be carried out a comparative analysis of classic PR and vector-resonant controllers in discrete domain with and without delay compensation. It is noted that there is an improvement in system performance when a computational delay compensator is used to compensate harmonics of high order.