In order to meet PQ standard limits, it may bernnecessary to include some sort of compensation. Modern solutions can be foundrnin the form of active rectification or active filtering. A shunt active powerrnfilter is suitable for the suppression of negative load influence on the supplyrnnetwork, but if there are supply voltage imperfections, a series active powerrnfilter may be needed to provide full compensation. In recent years, solutionsrnbased on flexible ac transmission systems (FACTS) have appeared. The applicationrnof FACTS concepts in distribution systems has resulted in a new generation ofrncompensating devices. A unified power quality conditioner (UPQC) is thernextension of the unified power-flow controller (UPFC) concept at therndistribution level. It consists of combined series and shunt converters forrnsimultaneous compensation of voltage and current imperfections in a supplyrnfeeder. An IPFC consists of two series VSCs whose dc capacitors are coupled.rnThis allows active power to circulate between the VSCs. With thisrnconfiguration, two lines can be controlled simultaneously to optimize thernnetwork utilization. An interline unified power-quality conditioner (IUPQC),rnwhich is the extension of the IPFC concept at the distribution level. Thisrnpaper presents a new unified power-quality conditioning system (MC-UPQC),rncapable of simultaneous compensation for voltage and current inrnmulti-bus/multi-feeder systems. In this configuration, one shunt voltage-sourcernconverter (shunt VSC) and two or more series VSCs exist. The system can bernapplied to adjacent feeders to compensate for supply-voltage and load currentrnimperfections on the main feeder and full compensation of supply voltagernimperfections on the other feeders.