Project 1

AC DC Rectifiers, Harmonics and related standards

PROJECT 1

Let's first design the Matlab simulation model with the following given data.

• Three phase line to line voltage = 208V
• Power of rectifier = 2.2Kw
• Frequency = 60Hz
• Sourse side inductance = 1 mH OR 1e-3 H
• DC side capacitor = 1100uF OR 1.1mF OR 11e-4 F

After designing the circuit in Matlab simulation the model will look like.

The output voltage waveforms will be obtained as.

The Output power will be as desired 2.2Kw

The input current is shown below.

Diode current and voltage

Also we have seen from the FFt analysis the following THD

THD input current = 74.42%

THD input voltage = 10.08%

THD output voltage = 128.47%

THD output current = 97.57%

The average DC voltage can be calculated as.

VoAvg = 3Vml/Pi

VoAvg = 3*294.15/3.14

VoAvg = 281V

Also the Average load current can be given as

IoAvg = VoAvg/R

IoAvg = 281/36

IoAvg = 7.80A

There fore the Power can ve given as

Pout = IoAvg * VoAvg

Pout = 281*7.80

Pout = 2191W ~ 2.2Kw

Also the Peak to peak ripple observed from waveforms is ~ 4V output voltage

and 9A for output current.

Now based on the Diode current and voltage wave forms we will select a the MUR1510G

Diode from ON semiconductor manufactures which has the following properties.

• High Voltage Capability to 600 V
• 175°C Operating Junction Temperature
• Weight: 1.9 Grams (Approximately)
• Lead Temperature for Soldering Purposes: 260°C Max. for
  10 Seconds
• Ifsm = 200A @145'C

Other details related to this switch can be found from the datasheet attached below.

Packages availlable for the diode

Part B

AIM:- A three-phase thyristor converter is supplied by 480V (line-line), 60 Hz source. Its internal

inductance Ls1=0.2 mH. The converter has a series inductance Ls2=2.0 mH. The load is

represented as RLE load with Ld=5 mH, rd=0 and Ed=600V and the delay angle is α=20°.

Using the simulation obtain vs, is and vd waveforms and calculate Is1, Is, DPF, PF and %

THD. Also give the selected thyristor based on the simulated studies with proper

ustification.

Let's first design the Matlab simulink model with the following given data.

• Input 3 phase voltage = 480V line to line
• Frequency = 60Hz
• Internal source inductance = 0.2mH
• Sourse inductance = 2.0mH
• Load inductance = 5mH
• Load battery voltage = 600V
• Delay angel = 20'

Based on these parameters we will design the simulink model as shown below.

The output current and voltage can be given as

The input voltage and current can be seen as

Also the thyristor voltage and current waveforms are as

Based on the simulations the Following THD are obtained

THD input current = 10.08%

THD input voltage = 74.42%

THD output current = 1861%

THD output voltage = 532%

Based on the voltage across the thyristor we will choose the HUAJING product with

part number KP200A which has the following parameters

• Vdrm/Vrrm = 100 to 6500V
• It Avg = 200A
• Itsm = 2500A
• Fs = 20Khz

Foot prints

Kindly find the attachment model files .mdl and datasheets of selected switches.