Power Electronic Transformer based DVR for Load Side Protection

Abstract: Now a day’s electrical equipment’s are more receptive to power quality problems. In power system there may be oscillation in power quality at the sensitive load due to faults and switching operation of breakers. This interruption results in breakdown of the equipment which connected at load side. In this paper, a bidirectional power electronic transformer based three phases four wires Dynamic Voltage Restorer (DVR) structure is projected to inject required series voltage to the electric power system in such a way that continuous sinusoidal voltage is seen at load side at heavy fault occurrences also main power quality problems like voltage sag and swell are deliberate. The PET- Power Electronic Transformer is a power transformer which has the advantage of increasing the frequency to reduce the overall size of transformer and hence this system delivers the extreme cost effective solution to alleviate the above problems which required by customer. So in MATLAB simulation model, this PET based DVR for load side protection against voltage disturbance is investigated which shows that power quality at load side improved with greater controllability and reliability.

Keywords: PET, DVR, SPS, PQ.