Comparison of DSTATCOM, DVR and UPQC for Mitigating Voltage Sag in Distribution System

In competitive power market environment, Power Quality (PQ) is utmost important. Any deviation in the standard PQ of supply leads to the system instability as well as system suffers from economic loss. To mitigate the PQ problem in Distribution System (DS) various high-power devices are installed. In this context DSTATCOM, DVR and UPQC are widely adopted PQ conditioner dedicatedly designed to enhance PQ in DS. This work presents the comparative analysis of these devices in terms of harmonic reduction and voltage regulation when the DS suffers the condition of voltage sag. Voltage sag is a frequent type of PQ problem which occurs due to the fault in system. Fault is a commonly occurring phenomenon in DS which is characterized by dip in voltage and high increase in current. If it is not cleared it causes severe threat to the system and can also damage the connected devices and equipments. This paper addresses the issues related to fault and the power conditioner mentioned above helps to retain the stability as well as PQ of the supply.