Single-Phase Thyristor Rectifier Bridge
Nominal values: Vs(rms) = 120 V at 60 Hz
Ls1 = 0.2 mH
Ls2 = 1.0 mH Ld = 20 mH
Rload = 5 Ω
Delay angle α = 45°
Problems
1. (a) Obtain vs, vd and id waveforms.
(b) Obtain vs and is waveforms.
(c) Obtain vm and is waveforms.
2. From the plots, obtain the commutation interval u and the dc-side current at the start of the commutation.
3. By means of Fourier analysis of is, calculate its harmonic components as a ratio of Is1.
4. Calculate Is, %THD in the input current, the input displacement power factor and the input power factor.
Single-Phase Full-Converter
VS 10 0 SIN (0 169.7V 60HZ)
Vg1 6 2 PULSE (0V 10V 2777.8US 1NS 1NS 100US 16666.7US)
Vg2 7 0 PULSE (0V 10V 2777.8US 1NS 1NS 100US 16666.7US)
Vg3 8 2 PULSE (0V 10V 11111.1US 1NS 1NS 100US 16666.7US)
Vg4 9 1 PULSE (0V 10V 11111.1US 1NS 1NS 100US 16666.7US)
R 11 4 10
L 4 5 20MH
VX 5 3 DC 0V; Load battery voltage
VY 10 1 DC 0V ; Voltage source to measure supply current
*Subcircuit calls for thyristor model
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XT1
|
1
|
2
|
6
|
2
|
SCR
|
; Thyristor T1
|
|
XT3
|
0
|
2
|
8
|
2
|
SCR
|
; Thyristor T3
|
|
XT2
|
3
|
0
|
7
|
0
|
SCR
|
; Thyristor T2
|
|
XT4
|
3
|
1
|
9
|
1
|
SCR
|
; Thyristor T4
|
*Subcircuit for switched thyristor model
.SUBCKT SCR 1 2 3 2
*model anode cathode +control -control
*name voltage voltage
S1 1 5 6 2 SMOD ; Switch
|
RG
|
3
|
4
|
50
|
|
VX
|
4
|
2
|
DC 0V
|
|
VY
|
5
|
7
|
DC 0V
|
|
DT
|
7
|
2
|
DMOD
|
|
RT
|
2
|
6
|
1
|
|
CT
|
6
|
2
|
10UF
|
|
F1
|
2
|
6
|
POLY(2) VX
|
; Switch diode
VY 0 50 11
.MODEL SMOD VSWITCH (RON=0.0125 ROFF=10E+5 VON=0.5V VOFF=0V)
.MODEL DMOD D(IS=2.2E-15 BV=1800V TT=0) ; Diode model parameters
.ENDS SCR ; Ends subcircuit definition
.TRAN 10US 50MS 16.67MS ; Transient analysis
.PROBE ; Graphics post-processor
.options abstol = 1.00u reltol = 1.0m vntol = 0.1 ITL5=0
.FOUR 120HZ I(VX) ; Fourier analysis
.END