A robust digital current control method for active power filters

A robust digital current control strategy for active power filters using vo ltage-source converters is presented. The proposed control system is design ed and implemented in the form of internal model control structure and take s the presence of computational time-delay into account. As a result, it pr ovides an effectively overshoot-free reference-to-output response. The stab ility of the closed-loop system has much lower sensitivity with respect to parameter uncertainties compared to the case when a conventional predictive controller is used. The experimental results obtained from a digital-signa l-processor-based single-phase experimental active power filter are also re ported,