Dynamic Voltage Restorer with New Hybrid Cascade Multilevel Inverter using Fuzzy Controller

Inverters are used in many applications now-a-days. One among the major applications is Dynamic Voltage Restorer (DVR), it is a custom power device to guard sensitive loads against voltage disturbances such as voltage sag and voltage swell, both considered to be important parameters of power quality. This paper attempts to study and analyze the performance of a DVR based on a new 11-level symmetrical multilevel inverter, using minimum required numbers of switches with fuzzy logic controller to compensate voltage sag and swell to regulate the load voltage to the best possible extent. The proposed multilevel inverter topology also reduces the cost and complexity in controlling of inverters