Challenge

Project 1

KKanthi Vamshi27 Dec 2022

Part A:

The three-phase diode rectifier is supplying approximately 2.2 kW load with VLL=208V at 60 Hz, Ls=1 mH and Cd=1100 μF, where Cd is the DC side capacitor. Design the circuit in one of the simulation platforms (MATLAB or Ltspice/Simetrix) and obtain the circuit waveforms. Based on their simulation studies find out the following:

Average dc voltage output, peak-to-peak ripple, the input current THD, DPF and PF and average dc current. Also give the selected devices with justification

- The simulink model for the above three-phase diode rectifier is shown below :-

- All the parameter blocks are shown below :-

1) Three-Phase voltage source :-

2) Diode :-

3) DC side capacitor :-

4) Load resistor :-

5) Source inductance (Ls) :-

- With the designed parameters as shown above the simulink model is run for a stop time of 0.2 seconds and the output result waveforms are shown below :-

- Due to technical issue from my MATLAB software the FFT analysis was not coming and i am unable to show it here.

Part B:

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 justification.

- The simulink model build for the Three-phase thyristor converter is shown below :-