Voltage Quality improvement by Dynamic Voltage Restorer Modeling
Keywords:
Voltage Quality, DVR, Real Power, Reactive Power, Phase Advance Technique, Minimum PowerAbstract
Voltage magnitude, waveform and frequency are the major factors that dictate the quality of power. The widespread application of non-linear power electronic loads has brought about degradation of power quality. Of all the power quality issues, voltage sags are the major cause of 80% of the problems experienced by sensitive loads. A Dynamic Voltage Restorer is a power quality device capable of protecting such loads against voltage variations. It injects a dynamically controlled voltage in series with the supply voltage through a booster transformer to correct the load voltage . Generally DVR can be connected to grid through inverter topologies such as Voltage Source Inverter (VSI) or Current Source Inverter (CSI).This device can be implemented to protect a group of medium or low voltage consumers. In this paper a model of a DVR for voltage and power injection, by the compensation method and phase advance voltage restoration method has been compared.
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