Title: :Analysis of single phase fully controlledbridge converter fed separately exciteddc motor .

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14

Aim: Create a model and simulate a single phase fully

controlled rectifier fed separately excited dc motor using MATLAB /Simulink to plot the average output voltage and output current waveform

• Motor parameter :Vrated : 200 V ; Nrated : 875 RPM ; Irated : 150ARa = 0.06 ohm ; La = 2.85 mH

Converter parameters:

single phase fully controlled Bridge Rectifier with an ac source voltage of 220 V,50Hz for firing angle α = 120 degrees and speed =-400 rpm

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14

Step 2: Find ωmIF ωm < ωmc The drive is operating under continuous conduction mode

(or) IF ωm > ωmc The drive is operating under discontinuous conduction mode

Step1 : Find Critical speed expression (ωmc) for single-phase fully-controlled Bridge rectifier

Formula used and Analytical Calculation:

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14

Find the Torque

Step 3: Find “Ia = (Va –Eb) /Ra”

Step 4: Find “T”

Step 2: Find “K = (Vrated –Irated *Ra) / ωrated

Step 3: Find “Eb=K*ω

• Step 1: Find “Va”• If continuous , Va = (2*Vm/π)*Cos(α)

• If discontinuous , Va =

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14

S.noApparatus

Simulink Library browser path

Block Parameters

1. Ac Voltage Source

Simulink/Simscape/Simpower systems/ Second generation/ Electrical sources

Ac voltage source

Amplitude = 220*1.414

Frequency = 50Hz

2. Thyristor Simulink/Simscape/simpower systems /

second generation/ power electronics

Thyristor Default values

Requirements : Software used: MATLAB R 2013 b

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14

3. Pulse generator(For Thyristor &

Thyristor 3 )

Simulink/Sources

Pulse generator Amplitude = 1Period (sec.) = 0.02 Pulse width (%) = 5Phase delay (sec.) = 6.67e-3

4. Pulse generator(For Thyristor 1 & Thyristor 2)

Simulink/Sources

Pulse generator Amplitude = 1Period (sec.) = 0.02 Pulse width (%) = 5Phase delay (sec.) = 16.67e-3

S.noApparatus

Library browser path

Block Parameters

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14

5. Resistor,Inductor

Simulink/Simscape/ simpower systems / second generation/ Elements

series RLC branch

R=0.06L=2.85e-3

6. DC voltage source Simulink/Simscape/ simpower systems/ second generation/ Electrical sources

DC voltage source

Amplitude = -87.31

S.noApparatus

Library browser path Block Parameters

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14

7. Voltage , currentmeasurements

Simulink/Simscape/simpowersystem /second generation/ measurement

Voltage , currentmeasurement

Default values

8. Powergui Simulink/ Simscape/simpower system/second generation

powergui -

12. Mean Simulink/ Simscape/simpower system /second generation/ Control &measurement Library / Measurement

Mean Frequency = 50

S.noApparatus Library

Block Parameters

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14

13. Display Simulink/ Sinks Display -

13. Scope Simulink/ Sinks Scope -

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14

Matlab /Simulink Diagram

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14

0 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016 0.018 0.02-400

-300

-200

-100

0

100

200

300

OUTPUT Voltage and Current Waveforms:for one cycle to find out Beta

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14

Result :

Average Output voltage Average Output current

Calculated Simulated Calculated Simulated

10/12/2016 Dr.R.SaravanaKumar , Professor, SELECT,VIT UNIVERSITY,Vellore-14