Vol-1 Issue-5 2015 IJARIIE-ISSN(O)-2395-4396 1407 www.ijariie.com 114 MC-UPQC – A NOVEL APPROACH IN MULTIFEEDER DISTRIBUTION SYSTEM FOR IMPROVEMENT OF POWER QUALITY ISSUES Sachin N. Gaikwad 1 , Harpreet Singh 2 , Rakesh kumar Jha 3 1 PG Scholar, Electrical Engineering, I E T, Alwar,Rajsthan, India 2 Associate Professor, Electrical Engineering, I E T, Alwar,Rajsthan, India 3 Assistant Professor, Electrical Engineering, SNDCOE&RC, Maharashtra, India ABSTRACT This paper presents a Multiconverter unified power-quality conditioning system (MC-UPQC), capable of simultaneous compensation for voltage and current in multibus/MultiFeeder systems. In this configuration, one shunt voltage-source converter (shunt VSC) and two or more series VSCs exist. The system can be applied to adjacent feeders to compensate for supply-voltage and load current imperfections on the main feeder and full compensation of supply voltage imperfections on the other feeders. In this setup configuration, all converters are connected back to back on the dc side and share a common dc-link capacitor. Therefore, power can be transferred from one feeder to adjacent feeders to compensate for sag/swell and interruption. A power system consist of two three phase three wire 380V (rms, L-L), is designed and simulated in MATLAB Simulink and compared Power transfer between two adjacent feeders and Compensation for interruptions. The performance of the MC-UPQC is evaluated under various disturbance conditions and it is shown that its best performance and less THD characteristic. A single phase prototype model of a 3 phase MC-UPQC selected and designed for hardware setup, main problem which we are going to solve using this prototype model is voltage dip. Keyword: - Multi Converter-Unified Power Quality Conditioner, Voltage Source Converter, Total Harmonic Distortion 1. INTRODUCTION With increasing applications of nonlinear and electronically switched devices in distribution systems and industries, power-quality (PQ) problems, such as harmonics, flicker, and imbalance have become serious concerns. In addition, lightning strikes on transmission lines, switching of capacitor banks, and various network faults can also cause PQ problems, such as transients, voltage sag/swell, and interruption. On the other hand, an increase of sensitive loads involving digital electronics and complex process controllers requires a pure sinusoidal supply voltage for proper load operation. In order to meet PQ standard limits, it may be necessary to include some sort of compensation. Modern solutions can be found in the form of active rectification or active filtering [15]. A shunt active power filter is suitable for the suppression of negative load influence on the supply network, but if there are supply voltage imperfections, a series active power filter may be needed to provide full compensation. In recent years, solutions based on flexible ac transmission systems (FACTS) have appeared. The application of FACTS concepts in distribution systems has resulted in a new generation of compensating devices. A unified power-quality conditioner (UPQC) is the extension of the unified power-flow controller (UPFC) concept at the distribution level [14]. It consists of combined series and shunt converters for simultaneous compensation of voltage and current imperfections in a supply feeder.