Robust control of a Shunt Active Power Filter for the medium voltage range based on a three-level Neutral Point Clamped converter

This paper presents a modelling procedure and a robust control technique applied to three phase voltage source shunt active filters. The modelling is based on the abc/dq transformation of the AC system variables. The currents injected by the active filter are controlled in the synchronous orthogonal dq frame. A new robust control technique for three-phase shunt active power filters based on a three-level neutral point clamped converter is proposed. The controller significantly improves the dynamic response of the converter to load steps without the need of a high crossover frequency of the DC-link voltage loop. The viability of the proposed scheme is shown by means of computer simulations using Sabertrade