Voltage Sag Compensation Using Dynamic Voltage Restorer

Abstract

Power quality plays a very important vital role in the modern utility grid where sensitive loads are employed. Equipment damage, temporary shutdowns, product quality degradation and Voltage Sag are the major problem associated with power quality. Dynamic Voltage Restorer (DVR) is a powerful device which is used to improve voltage mitigation of weak buses associated in a multi-bus system. This paper incorporates the functional performance of DVR during voltage sag in the power system. Penetrating a voltage of required magnitude and frequency to restore the voltage across the load within the desired amplitude is the main objective of DVR. The proposed work based on modeling and simulation of DVR, in a closed-loop control of an eight bus system. Voltage compensation is done effectively using DVR in the Closed loop FLC controlled system and its analyzed with PID Controlled system. The simulation result shows Closed loop FLC system using DVR is observed to be faster than PID controlled systems.

A Combination of Appropriate Placement and size of Multiple FACTS Controllers to reduce Voltage Sag and Swell

“…The DVR injects energy into the distribution system to maintain voltage stability, and the DVR is connected to the system via the transformer [13].A FACTS device, the DVR adjusts for load disturbances such as voltage harmonics and sags. The DVR normally injects a small number of voltages in series with the transmission lines and a small number of volts [14][15][16][17][18][19][20]. The voltages are then supplied into the system to keep the system stable.…”

“…Modeling and simulation of customized power conditioners are necessary since power electronics-based equipment is utilized to enhance power quality in distribution networks [18]. The following are some of the extended merits of the UPQC [26][27][28].…”