AIM OF THE EXPERIMENT:
Study of three phase Fully Controlled Full Wave Bridge Converter with RL
load and three phase Half Controlled Bridge Converter with RL load using PSIM.
SIMULATION DIAGRAM:
1. Three Phase Half Controlled Bridge Converter with RL load:-
2. three phase Fully Controlled Full Wave Bridge Converter with RL
load:-
THEORY:
Three Phase Half Controlled Bridge Converter with RL load:-
Three phase half converter consists of three diode and three thyrister. Let us
consider thyrister T1 is triggered at ωt=(π/6 + α). As diode D3 is already turned on
, T1D3 will conduct. After ωt=π/2 , diode D3 becomes reversed biased as the diode
D1 becomes forward bias & takes the control. In interval π/2 to (5π/2 + α) T1D1
conducts the load current i.e. until the thyrister T2 is triggered.
At ωt=(5π/6 + α) the thyrister T2 is triggered and T2D1 conducts the current
until D1 is reverse biased. This process will continue as the sequence given bellow.
T1D3, T1D1,T2D1, T2D2, T3D2, T3D3, T1D3, T1D1 & so on.
For discontinuous mode (α>60°)
The phase voltages are given bellow
VM = Peak voltage
VAN = VMsin(ωt)
VBN = VMsin(ωt + 2π/3)
VCN = VMsin(ωt - 2π/3)
For discontinuous mode (α>60°) average and rms value of output voltage is given
by
VOAVG = (3√3VM/2π)(1+cosα)
VORMS = √3VM {(3/4π)(π-α+(sin2α)/2)}1/2
For continuous mode (α<=60°) average and rms value of output voltage is given by
VOAVG = (3√3VM/2π)(1+cosα)
VORMS = √3VM {(3/4π)(2π/3+√3cos2 α)}1/2
Three Phase Fully Controlled Full Wave Bridge Converter with RL load:-
Three phase full converter consists of six thyristers. Let us consider thyrister
T1 is triggered at ωt=(π/6 + α) & at that time T3 is already conducting .During
interval ωt=(π/6 + α) to ωt=(π/2 + α) T1 & T6 conduct together.
Thyrister T2 is triggered at ωt=(π/2 + α), T6 is turned off naturally as it is
reverse biased as soon as T2 is triggered. During interval ωt=(π/2 + α) to
ωt=(5π/6 + α) T1 & T2 conduct together. This process will continue as the
sequence given bellow.
T1T2, T2T3, T3T4, T3T4, T4T5, T5T6, T6T1, T1T2 & so on.
Average and rms value of output voltage is given by
VOAVG = (3√3VM/π)cosα
VORMS = √3VM(1/2 + (3√3/4π)cos2α)1/2
CIRCUIT PARAMETERS:
Sl No Element Name Details
1 Sinusoidal Voltage Source 50Hz ,230V, 1piece
2 Thyristor 6 pieces
3 Voltage Probe(node to ground) 3 pieces
4 Voltage Probe 1 piece
5 Diode 3 pieces
6 Current Probe 2 pieces
7 Resistor 10ohm, 1piece
8 Inductor 5H, 3H, 2 pieces
9 Gating block 1 piece
SIMULATION WAVEFORMS:
1. Three Phase Fully Controlled Full Wave Bridge Converter with RL load
(VOAVG = 200V):
2. Three Phase Half Controlled Bridge Converter with RL load
(VORMS = 200V):
TABULATION:
Table for three phase Fully Controlled Full Wave Bridge Converter with RL
load and three phase Half Controlled Bridge Converter with RL load:
Sl. Load Converter Vs Voavg Input p.f Vorms
No: Values Type (r.m.s)
C M C M C M
1 R=10, phase Fully 400 200 199. 0.3 0.53 252. 284.4
L=5H Controlled 7 5 36
Full Wave
Bridge
Converter
2 R=10, three phase 400 122. 129. 0.3 0.28 201. 202.4
L=3H Half 3 4 1 7
Controlled
Bridge
Converter
C: calculated value, M: measured value
CALCULATION:-
CONCLUSION:-
The circuit diagram and waveforms of three phase Fully Controlled Full Wave
Bridge Converter with RL load and three phase Half Controlled Bridge Converter
with RL load using PSIM was studied and all parameters like VORMS, VOAVG , input
power factor was calculated and compared with measured value.
ANSHUMAN DEBATA
Regd. No. : 1801106093
Section : A1
Branch : Electrical
