A Novel Control Scheme for Single and Three phase Dynamic Voltage Restorer Using PSCAD/EMTDC

The Dynamic Voltage Restorer, it is a power electronic device which resolved the problems related to voltage and current which in the transmission lines. The main objective is enhance the voltage difference (which can be determined as output between and voltage sag and also pre-sag) to the power line and helps to maintain the pre-sag voltage condition in the systems mainly side (load). Many type of schemes are implemented on compensation techniques. A control scheme for the single and three phase voltage instability based on in-phase compensation technique.. The simulation was observed and simulated out using EMTDC/PSCAD (Electromagnetic transients including DC/Power system computer aided design Student software version 4.1.0) and their results show various levels of compensation for voltage sag.