Abstract
Achieving high voltage quality for electrical power system with small size device and low cost has a great interest recently. This paper proposes a three-phase transformer-less dynamic voltage restorer (DVR) system that can mitigate the voltage disturbances in electrical distribution network. The proposed DVR system depends on the multilevel inverter (MLI) with twelve power electronic switches producing 49 levels in the output voltage. The present DVR is characterized by low cost and small size where the number of switches is lower than other DVR systems, and eliminate the filter requirements. The proposed DVR presents a compensation scheme with optimal utilization of energy. The DVR system is modeled using PSCAD/EMTDC software and the simulation results are discussed. A high performance with different fault types is obtained using the proposed DVR system. With the help of the dSPACE (DS1104) evaluation board, the prototype of the proposed DVR has been constructed and tested in laboratory.
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