Parallel-Connected Shunt Hybrid Active Power Filters Operating at Different Switching Frequencies for Improved Performance

Power Quality Conditioners for Railway Traction—a Review

“…Hence, many publications [48-56, 60-74, 80-81, 129] have been reviewed on three-phase power quality conditioners suitable for railway traction with many control strategies. In the three-phase power quality conditioners, active filters can be connected in series, shunt [48][49][50][51][52][53][54][55][56][57], combination of series and shunt called unique power quality conditioners [80][81] and passive filters combined with active filters [60][61][62][63][64][65][66][67][68][69][70][71][72][73][74]129] are being used.…”

“…Many publications for flicker [39][40]59] and many other publications [57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74] [35,63,64], Multilevel Direct PWM (122) and Prony Algorithms [48] to improve the dynamic and steady state performance of power quality conditioners.…”

“…Power quality conditioners for railway traction based on topology are classified as passive filter [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33], active filter in series [50,56] shunt [37,38,40,43,46,47,49,51,52,54,55,108] and combination of active filter and passive filters connected in shunt known as hybrid filters [36,43,60,62,63,65,66,67,69,70,71,73,74,107,119], half bridge [112], TCR with fixed capacitors [108,129] TCR with passive …”

“…The second [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] is about passive filters and designing of the selftuned filters used in railway traction. 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.…”

Passivity-Based Direct power control of Shunt Active Filter under Distorted Grid Voltage Conditions

“…The progressive use of energy conversion systems, such as computer equipment, variable speed drives, power rectifiers in heavy industry and power of the oars subway via the overhead contact lines, significantly contributes to the degradation of the quality of electrical energy [1][2][3]. Indeed, these electrical equipment, absorbing non-sinusoidal currents, are harmonic generators leading disturbances in power grids [4,5].…”