IMPROVEMENT OF POWER QUALITY (PQ) BY UPQC (UNIFIED POWER QUALITY CONDITIONER) IN POWER SYSTEM USING ADAPTIVE NEURO FUZZY (ANFIS) TECHNIQUE

The main motive of power utilities is to provide uninterrupted sinusoidal voltage of constant amplitude to their customers. This depends upon the loads and their sensitivity to supply voltage fluctuations. In the last few years the quality of power is the very serious issue in the power system. These issues related to power system quality are more attentive in power electronic devices. So these all power electronic devices are largely affected by the PQ disturbances. Various devices are used for compensation of problems related to power quality for continuously change in voltage. There is one device named Unified Power Quality Conditioner (UPQC) is used for the loss due to PQ fluctuations. It is a combination of series compensator DVR (Dynamic Voltage Restorer) & Shunt Active Power Filter (APF) or Distribution STATCOM connected with the help of a DC link capacitor. This device used successfully for almost all the disturbances such as voltage and current harmonics, unbalanced voltage and current, voltage flicker, Voltage sag and voltage swell [12] etc. There are many optimization techniques to improve the PQ in the transmission and distribution system.