Design and Implementation of Three Phase TCHB-Based DVR

Abstract

This article presents the design of a reduced device count and enhanced compensation capability 5-level transistor clamped H-bridge (TCHB) inverter topology based DVR in a three phase system. TCHB-based DVR is designed for the prototype distribution system. The improved performance of the DVR is observed due to the implementation of the TCHB inverter. The unit vector template based PI controller is used for DVR implementation. The developed DVR is used to eliminate the various power quality disturbances (PQD) such as the sag, voltage imbalance, voltage harmonics, and voltage swell for the three phase system. Compensation capability of the developed DVR is demonstrated through simulation and experimentation. The developed DVR is working effectively by mitigating power quality disturbances with reduced filter size and switching frequency in comparison with existing 2-level topologies. This topology requires only one DC source as compared to CHB MLI. The grid is operated at 110 V/phase and 1.5 kVA/phase rating and DVR is designed for 55 VA/phase rating.