Performance Investigation of Transformerless DVR Based on T-type Multilevel Inverter with Reduced Switch Count

Abstract

Voltage sag is typically the most severe power quality problem in power systems. Dynamic voltage restorers (DVR) are recognized to be a cost-effective solution for protection of sensitive loads from the power quality problems. Continuation of cost reduction, reliability and efficiency can be achieved by eliminating the injection transformer. This paper explains transformerless DVR based on a T-type multilevel inverter. The proposed DVR will not have an injection transformer which leads to less cost, less weight, and small size. The controller of the DVR is implemented by d-q transformation. The simulation results of dynamic voltage restorer are generated by MATLAB/SIMULINK software. © 2019 IEEE.