www.ijcrt.org © 2018 IJCRT | Volume 6, Issue 1 January 2018 | ISSN: 2320-2882 IJCRT1801328 International Journal of Creative Research Thoughts (IJCRT) www.ijcrt.org 297 TO PROVIDE ADDITIONAL GRID VOLTAGE REGULATION AS A STATCOM BY IUPQC CONTROLLER SHAIK FARZANA 1 , M. DILIP KUMAR 2 1 PG Scholar, Dept of EEE, Dr. K.V. Subba Reddy College of Engineering for Women, Kurnool, AP, India, 2 Associate Professor, Dept of EEE, Subba Reddy College of Engineering for Women, Kurnool, AP, India. Abstract— In this project an improved controller for the dual topology of the unified power quality conditioner (iUPQC) extending its applicability in power-quality compensation, as well as in micro grid applications. By using this controller, beyond the conventional UPQC power quality features, including voltage sag/swell compensation, the iUPQC will also provide reactive power support to regulate not only the load-bus voltage but also the voltage at the grid-side bus. In other words, the iUPQC will work as a static synchronous compensator (STATCOM) at the grid side, while providing also the conventional UPQC compensations at the load or micro grid side. In actual power converters, as the switching frequency increases, the power rate capability is reduced. Therefore, the iUPQC offers better solutions. Simulation results are provided to verify the new functionality of the circuit. Index Terms—iUPQC, micro grids, power quality, static synchronous compensator (STATCOM), unified power quality conditioner (UPQC). I. INTRODUCTION CERTAINLY, power-electronics devices have brought about great technological improvements. However, the increasing number of power-electronics-driven loads used generally in the industry has brought about uncommon power quality problems. In contrast, power-electronics- driven loads generally require ideal sinusoidal supply voltage in order to function properly, whereas they are the most responsible ones for abnormal harmonic currents level in the distribution system. In this scenario, devices that can mitigate these drawbacks have been developed over the years. Some of the solutions involve a flexible compensator, known as the unified power quality conditioner (UPQC) [1]–[7] and the static synchronous compensator (STATCOM) [8]–[13]. The power circuit of a UPQC consists of a combination of a shunt active filter and a series active filter connected in a back-to-back configuration. This combination allows the simultaneous compensation of the load current and the supply voltage, so that the compensated current drawn from the grid and the compensated supply voltage delivered to the load are kept balanced and sinusoidal. The dual topology of the UPQC, i.e., the iUPQC, was presented in [14]–[19], where the shunt active filter behaves as an ac-voltage source and the series one as an ac-current source, both at the fundamental frequency. This is a key point to better design the control gains, as well as to