Journal of Electrical Engineering : Volume 17 / 2017 - Edition : 2

Mitigation of Power Quality Problems and Harmonics Compensation Using Capacitor-Supported Dynamic Voltage Restorer (DVR)

Amit Kumar
Deepak Kumar
Abhay Yadav
industrial electrical power systems
Power quality is an important issue in distribution network system. In present day, the industrial equipment is primarily based on electronic component such as rectifier, thyristors together with programmable sensing controllers and power electronic drives. These devices are very sensitive to instabilities and end up less tolerant to power quality issues. In the industrial and commercial equipment, voltage sags are serious and most common problems. By reactive power injection at the point of common coupling, balanced voltage is achieved. Several custom power devices are utilized to improve the quality of power but DVR is efficient and gives quick response, high reliability and cost is low. In this paper, we proposed a new scheme to control the self-supported dynamic voltage restorer (DVR) and different compensation techniques and operating modes are discussed. In this scheme, three phase harmonic filter (double tuned) is used to moderate harmonics, generated by voltage source converter (VSC). DVR operates within minimum energy rating. Capacitor is utilized as energy storage device during compensating the disturbance. Three phase programmable source is used to generate the disturbances within supply voltage. Through DVR, compensating the supply voltage harmonics the total harmonic distortion (THD) is minimized at load bus. By using a reduced-rating DVR, the reimbursement of the voltage dip, voltage swell, and harmonics is demonstrated. DVR works as enforced commutate
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