Dynamic Voltage Restorer Based on Matrix Converters

In this paper، a new topology based on matrix converter (MC) is proposed for dynamic voltage restorer (DVR). Matrix converters convert ac to ac with no dc link. So، using this type of converters is an acceptable way to eliminate dc link in conventional DVRs. Three independent three-phase to single-phase MCs with 6 or 8 bi-directional power switches are used in the proposed topology. The range of the DVR’s correct operation varies selecting 6 or 8 number of bi-directional power switches in matrix converters. As a result، the proposed DVR structure can be used to restore load voltage in both balanced and unbalanced voltage sag and swell conditions. Due to the fact that the proposed topology is based on matrix converters and considering that the matrix converters do not have dc link، the speed of the proposed DVR increases and in return decreases thesize of DVR، due to the dc link elimination. The proposed DVR can be presented as a package. Also، one of the most important capabilities of the proposed DVR is the voltage restoring in extremely distorted networks. It is worth noting that the proposed topology would not face any problem in long time compensation due to the fact that it provides the required energy directly through the grid. The experimental results as well as simulation results in PSCAD/EMTDC environment show the capabilities of the proposed topology.