PSPICE Simulation

* Three-phase Full-wave Fully-Controlled Bridge Rectifier
VA 1 0 SIN(0 340V 50Hz)
VB 2 0 SIN(0 340V 50Hz 0 0 -120)
VC 3 0 SIN(0 340V 50Hz 0 0 -240)
XT1 1 4 11 4 SCR
XT3 2 4 13 4 SCR
XT5 3 4 15 4 SCR
XT4 5 1 14 1 SCR
XT6 5 2 16 2 SCR
XT2 5 3 12 3 SCR
RP 4 0 100K
RN 5 0 100K
R1 4 6 10
L1 6 5 31.8M

VP1 21 0 PULSE(0 10 3333.3U 1N 1N 100U 20M)
VP2 22 0 PULSE(0 10 6666.7U 1N 1N 100U 20M)
VP3 23 0 PULSE(0 10 10M 1N 1N 100U 20M)
VP4 24 0 PULSE(0 10 13333.3U 1N 1N 100U 20M)
VP5 25 0 PULSE(0 10 16666.7U 1N 1N 100U 20M)
VP6 26 0 PULSE(0 10 0M 1N 1N 100U 20M)
RP1 21 0 100K
RP2 22 0 100K
RP3 23 0 100K
RP4 24 0 100K
RP5 25 0 100K
RP6 26 0 100K
EP1 11 4 poly(2) (21,0) (22,0) 0 1 1
EP2 12 3 poly(2) (22,0) (23,0) 0 1 1
EP3 13 4 poly(2) (23,0) (24,0) 0 1 1
EP4 14 1 poly(2) (24,0) (25,0) 0 1 1
EP5 15 4 poly(2) (25,0) (26,0) 0 1 1
EP6 16 2 poly(2) (26,0) (21,0) 0 1 1

* Subcircuit for SCR
.SUBCKT SCR 101 102 103 102
S1 101 105 106 102 SMOD
RG 103 104 50
VX 104 102 DC 0
VY 105 107 DC 0
DT 107 102 DMOD
RT 106 102 1
CT 106 102 10U
F1 102 106 POLY(2) VX VY 0 50 11
.MODEL SMOD VSWITCH(RON=0.0105 ROFF=10E+5 VON=0.5 VOFF=0)
.MODEL DMOD D((IS=2.2E-15 BV=1200 TT=0 CJO=0)
.ENDS SCR

.TRAN 10US 60.0MS 0.0MS 10US
.PROBE
.FOUR 50 V(4,5) I(VA) I(L1)
.OPTIONS(ABSTOL=1N RELTOL=.01 VNTOL=1MV)
.END

The results of the Fourier series analysis are presented below.

The Fourier Series Spectrum of the output voltage

The Fourier Series Spectrum of the Line Current (Phase A)

The Fourier Series Spectrum of the Load Current

It can be seen that the lowest harmonic frequency in the output voltage is at 300 Hz, the sixth harmonic, whereas there is hardly any harmonic present in the load current because of the relatively large inductance in the load circuit. On the other hand, the 5-th and the 7-th harmonics are visibly high in the line current.