Abstract:
In the past decades, the Power Quality (PQ) has become a critical issue in highly automated industries and
sensitive load centers. The voltage quality is the most important part of the PQ for customers. The voltage disturbances
in the form of voltage sag, swell and harmonics can cause huge financial losses. In the past few years, the power
electronic solutions have been proposed to avoid these problems. The Dynamic Voltage Restorer (DVR) is one of the
solutions. This paper proposes a topology for three phase DVR which is able to compensate multiple voltage with a
simple topology. The proposed DVR is based on the three-phase direct AC/AC converter which is energized from the
main grid. As a result, there is no need for energy storage elements and dc link capacitors. The proposed topology can
deal with high voltage with low voltage rating switches. Therefore, the switches can be IGBTs without needing an
auxiliary force commutation circuit as in thyristors which are high voltage switches. The simulation results in
PSCAD/EMTDC environment shows that this topology operates correctly and the voltage of sensitive load is
completely controlled.
