MODELLING AND SIMULATION OF SINGLE PHASE FULL CONTROLLED BRIDGE RECTIFIER WITH RL AND RLE LOADS.
Aim:
To model and simulate the single phase full wave controlled bridge rectifier with RL and RLE loads with and without LC filter by using MATLAB/SIMULINK.
Procedure:
Steps to create modeling by using MATLAB/SIMULINK:
Components
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Tool Box / Library browser
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Block
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parameters
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AC Voltage Source
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Simpower Systems / Electrical sources
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AC voltage source
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Peak Amplitude(v) =230*sqrt(2) Phase(deg) =0
Frequency(Hz) =50
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Thyristors (T1, T2, T3 &T4)
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Simpower Systems / Power Electronics
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Thyristor
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Default
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Repeating Sequence(R1)
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Simulink / Sources
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Repeating Sequence
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Time Values = [0 0.01 0.01 0.02]
Output Values = [0 5 0 0]
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Repeating Sequence(R2)
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Simulink / Sources
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Repeating Sequence
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Time Values = [0 0.01 0.02 0.02]
Output Values = [0 0 5 0]
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Relational Operator
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Simulink /Math Operations
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Relational Operator
(2 numbers)
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Greater than or equal to (>=)
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Constant
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Simulink / Sources
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Constant
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Constant Value=1
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Fourier
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SimpowerSystems/Extra Library/Measurements
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Fourier
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Fundamental Freq : 50 Harmonic: 0
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Load
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Simpower Systems / Elements
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Series RLC Branch
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Resistance(Ohm) =10 Inductance(H) =8e-03 Capacitance(F) =inf
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1. Click on File€ New€Model.
2. On resulting window click on library Browser, a Simulink library browser will appear.
3. Make/Model the circuit by placing all its Blocks from its corresponding Library/toolbox, which is clearly shown in the table 1. Right click on the block to rotate mirror etc. to organize the circuit elements.
4. To get any one of the element in series RLC branch, such as R, L, or C, click on series RLC branch block in the Simpower System/Element library, and enter the parameters value in such a way that other two elements are invisible. That is to eliminate resistance, inductance, or capacitance of the branch, the R, L and C values must be set respectively to 0, 0 and inf.
5. To change the circuit parameters applicable to the block by double clicking on the block/element and type the values. Keep the values default for some blocks like thyristor, diodes, mosfet etc.
6. To measure/observe the voltage across or current passes through the electrical block/device, connect voltage measurement or current measurement blocks respectively with the electrical block, it is available on the library Simpower System/measurement.
7. To observe the waveform in figure window, scope block is connected with voltage measurement and current measurement blocks. This scope block is available by click on Library browser€simulink/source€scope.
8. For single phase full controlled Bridge rectifier with RL load, components required and its parameter values are similar to that of RLE load, except E parameter. That is DC voltage source block must remove from schematic. The schematic arrangement is shown in schematic diagram 2.
9. For single phase full controlled Bridge rectifier with R load, components required and its parameter values are similar to that of RLE load, except L and E parameters. That is L must set to 0, and DC voltage source is removed from the schematic. The schematic arrangement is shown in schematic diagram 1.
10. Before simulating the circuit, ensure that all the blocks are connected properly. The most common error encountered is ‘floating node’. This usually means that there is some problem ininterconnects.
Steps to simulating the circuit by using MATLAB/SIMULINK:
1. After correcting all floating node errors start by creating a simulation.
2. Click on simulation€configuration parameters and make sure that solver option is ‘ode23tb’, it is essential when circuit contains power system or power electronics tools.
3. To run the simulation, select simulation€ start.
4. If any errors are reported here. Correct schematic or the simulation settings and re-run simulation.
5. To view simulation plots on simulation window, double click the scope in the schematic. The scope block corresponding to voltage measurement and current measurement blocks gives voltage and current waveforms respectively with respect to time.
TABLE 1: For R Load
Slno
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Control Voltage
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Firing Angle ( )
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Simulated Edc
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Calculated Edc
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1
| ||||
2
| ||||
3
| ||||
4
| ||||
5
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TABLE 2: For RL Load
Slno
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Control Voltage
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Firing Angle ( )
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Simulated Edc
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Calculated Edc
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1
| ||||
2
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3
| ||||
4
| ||||
5
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Result:
The model of single phase full wave controlled bridge rectifier with R, and RL load is created and simulated by using MATLAB/SIMULINK and the corresponding waveforms are observed.
MATLAB SIMULATION VALUES:
1A.R-L load with LC Filter
1.AC Voltage Source:
Peak amplitude (V)= 100
Frequency (Hz):50
2.Thyristor = default values
3.Pulse Generator 1,2 :
Amplitude:1
Period (secs):0.02
Pulse Width (% of period):50
1.Phase delay (secs):0.0025
2.Phase delay (secs): 0.0125
4. Branch type: RL :
R:15
L:0.02
5.Filter type: LC
L:0.001
C:0.025
1B.R-L load without LC Filter :
1.AC Voltage Source:
Peak amplitude (V)= 100
Frequency (Hz):50
2.Thyristor = default values
3.Pulse Generator 1,2 :
Amplitude:1
Period (secs):0.02
Pulse Width (% of period):50
1.Phase delay (secs):0.0025
2.Phase delay (secs): 0.0125
4. Branch type: RL :
R:15
L:0.02
1C.R-L-E load with LC Filter:
SIMULATION VALUES:
1.AC Voltage Source:
Peak amplitude (V)= 230
Frequency (Hz):50
2.Thyristor = default values
3.Pulse Generator 1,2,3,4 :
Amplitude:1
Period (secs):0.02
Pulse Width (% of period):50
1.4.Phase delay (secs):0.0025
2,3.Phase delay (secs): 0.0125
4. Branch type: RLE :
R:20
L:0.01
E:100
5.Filter type: LC
L:0.001
C:0.025
1D.R-L-E load without LC Filter
SIMULATION VALUES:
1.AC Voltage Source:
Peak amplitude (V)= 230
Frequency (Hz):50
2.Thyristor = default values
3.Pulse Generator 1,2 3,4:
Amplitude:1
Period (secs):0.02
Pulse Width (% of period):50
1.4.Phase delay (secs):0.0025
2,3.Phase delay (secs): 0.0125
4. Branch type: RLE :
R:20
L:0.01
E:100
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