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High Frequency Link-Dynamic Voltage Restorer with Fuzzy Logic Controller

Deepti.K.Dinesan, Dr.S.Muthukumaran

In distribution power systems, voltage sag mostly results in financial losses and power quality issues. Power quality improvement can be achieved by conventional Dynamic Voltage Restorers (DVRs), which use bulky as well as costly power frequency transformers. These cause power losses and voltage drop. A High Frequency Link Dynamic Voltage Restorer (HFL-DVR) with fuzzy logic controller is proposed in this paper. The main features of HFL –DVR include relatively low losses, small size and low cost. The number of energy storage devices required is also less. The use of High Frequency Isolation Transformer helps to reduce the voltage rating of battery and also provides galvanic isolation with electrical safety. A fuzzy logic controller is added for obtaining acceptable properties, by reducing the effect of disturbances on the DVR output for both voltage sag and swell conditions.