INTERLINE DYNAMIC VOLTAGE RESTORER FOR CASCADED H- BRIDGE INVERTER WITH FUZZY LOGIC

Abstract

In this study, we suggest a novel approach for reducing harmonics under distortion voltages, namely a fuzzy logic controller. The real grid code required for connecting to the grid. voltage sags of lengthy durations, as well as harmonics in distributed generating systems. New sag mitigation technology, the interline dynamic voltage restorer (IDVR), consists of multiple dynamic voltage restorers (DVRs) linked together by a single DC connection, each of which is coupled to a distribution feeder in series. Power may be shifted from one feeder to another during the sag period, preventing long-term voltage sags. IDVR compensation capacity, on the other hand, is heavily dependent on the load power factor, and a greater load power factor results in poorer IDVR performance. A novel solution is provided in this study to overcome this constraint, which permits decreasing the load power factor during sag situations and therefore increasing the compensating capacity by employing fuzzy logic. Two cascaded H-bridge multilevel converters are used to inject ac voltage with reduced total harmonic distortion and avoid the need for low-frequency isolation transformers on one side of the proposed IDVR. Simulations in the Matlab/Simulink environment are used to verify the proposed configuration's validity.