Abstract: In the distribution system, the load end consists of different kinds of linear and non-linear loads. Use of these non-linear loads invites various power quality issues viz. voltage sag, swell, flicker, imbalance, harmonics, transient, etc. These issues can be mitigated with the help of Passive Filters, Active Filters, Static VAR Compensators (SVC), Flexible A.C Transmission System (FACTS) device, Custom Power Device (CPD), and other devices. Unified Power Quality Conditioner is a CPD used to alleviate power quality issues in the distribution network. UPQC can be divided into series compensator and shunt compensator. Series compensator takes care of voltage related problems (voltage sag, swell, and harmonics in voltage) while shunt compensator takes care of current related problems (current harmonics, neutral current, etc.). The work presented in this paper has been dedicated to improve power quality by alleviating various power quality issues in the distribution network using UPQC WITH VSI USING SHUNT COMPENSATOR. Here, various power quality issues, cause of their production, impact on various power system equipment, and distinct kind of devices used to mitigate them are discussed. The main focus of this work is on UPQC WITH VSI USING SHUNT COMPENSATOR.
Keywords: UPQC, VSI, POWER QUALITY IMPROVEMENT, FACT DEVICE.
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