Power quality conditioning using Hybrid multilevel inverter as UPQC

Power Quality Conditioners for Railway Traction—a Review

“…SVC with active filter [64], Series passive filter with TCR based variable impedance [61], combination of active filter both in shunt and series called unified power quality conditioners [76-81, 121, 123-127] and multilevel PQ compensators [72,73,75,76,77,81,122,124,128].…”

“…This type of conditioner is used for unbalanced loads, reactive power compensation and to maintain the terminal voltage. It can be configured as multilevel [77,81,122,124], single-phase [78,79,121,123,125,126,127] and three-phase [80] UPQC and hence, this type of power quality conditioner can be considered as an A hybrid filter, a combination of shunt active and passive filter is shown in Fig.5. [129].…”

“…The third and fourth [57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74] deal with active filters and hybrid active filters used for power quality problems like power factor, reactive power and harmonic compensation in railway traction. The fifth [75][76][77][78][79][80][81] focuses on unified power quality conditioner, which suits various power quality problems such as power factor, reactive power compensation, voltage and load imbalance. The sixth category deals with various compensation methods of power quality problems due to railway traction loads.…”