Digital proportional-resonant (PR) control with anti-windup applied to a voltage-source inverter

Integral anti-windup is crucial for controlling converters subjected to constrains by the dc-link voltage. However, little literature is available about anti-windup if PR-controllers are applied. This paper presents a new approach to tackle this problem by controlling damping of the resonator. Another aim is to analyze why one common anti-windup strategy for PI-controllers, that reduces the input of the integrator, also works for PR-controllers. Even though the proposed damping anti-windup showed a somewhat lesser performance than the conventional one, it ensured stability. The newly proposed strategy is inherently stable and thus easy to tune. In particular, it is a reliable anti-windup for DSP-controlled converters.