An Anti-Windup Scheme for Proportional Resonant controllers with tuneable phase-shift in Voltage Source Converters

An Anti-Windup (AW) scheme is developed in this paper for Proportional Resonant (PR) controllers in the current control loop of a voltage source converter with an LCL filter. The innovation of this scheme lies in the fact that the anti-windup feedback signal is distributed to each input of the integrator. By controlling the percentage of this distribution, one can effectively adjust the phase shift introduced from this feedback signals to match that of the reference signal. The issue of zero sequence components in the three phase modulation signal has also been identified, and their effects have been neutralized by a proportional feedback controller. The performance of the proposed scheme is validated by simulation by comparing it with existing techniques for a grid-connected voltage source converter with a double loop current control. It has been shown that the proposed scheme produces lower current distortion and a higher power factor.