PROJECT TITLE :

Dynamic voltage restorer employing multilevelcascaded H-bridge inverter - 2016

ABSTRACT:

This study presents style and analysis of a dynamic voltage restorer (DVR) that employs a cascaded multilevel inverter with capacitors as energy sources. The multilevel inverter permits the DVR to attach on to the medium voltage networks, hence, eliminating the series injection transformer. Using zero energy compensation technique, the DVR does not need active energy storage systems, such as batteries. Since the energy storage system only includes capacitors, the management system can face some extra challenges compared with alternative DVR systems. Controlling the voltage of capacitors around a reference voltage and keeping the balance between them, in standby and compensation amount, is one in every of them. A control theme is presented during this study that overcomes the challenges. Additionally, a quick 3-part estimation technique is used to minimise the delay of DVR and to mitigate the voltage sags as quick as doable. Performance of the management theme and estimation methodology is assessed using many simulations in PSCAD/EMTDC and MATLAB/SIMULINK environments, and experiments on a 7-level cascaded H-bridge converter.