Author(s): B.Rajani, Dr.P.Sangameswara Raju
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Vol.1 - Issue 3 ( May- 2012)
This paper presents the researches on the Dynamic Voltage Restorer (DVR) application for power quality Improvement in electrical distribution network. Due to increasing complexity in the power system, voltage sags are now becoming one of the most significant power quality problem. voltage sags is a short reduction voltage from nominal voltage, occurs in a short time . temporary Voltage sag is bound to have a greater impact on the industrial customers. If the voltage sags exceed two to three cycles, then manufacturing systems making use of sensitive electronics equipments are likely to be effected leading to major problems .It ultimately leads to wastage of resources as well as financial losses. The increasing competition in the market and the declining profits has made it pertinent for the industries to realize the significance of high power quality. This is possible only by ensuring that uninterrupted flow of power is maintained at proper voltage levels .This can solve by using custom power devices such as DVR, Distribution static compensator (D-STATCOM) and un interruptible power supply (UPS). The Dynamic voltage Restorer appears to be an especially good solution in the current scenario. Two pulse width modulation ?based control techniques, viz. sinusoidal PWM and space vector PWM ,are presented for controlling the electronic valves in two level voltage source converter(VSC) used in the DVR system .The Simulation study of space vector PWM technique for DVR is compared with sinusoidal PWM. The performance of DVR as well as the adopted control algorithm is illustrated by simulation. The results obtained in PSCAD/EMTDC.
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