Project 2

Problem statements:

Part A:

1. Design a DC power supply using PFC circuit for general purpose applications with 350V dc output and load in the range of 0-7A. The supply should meet the harmonic standard limits for input power quality such that current THD limits are satisfied with input power factor >0.97 value. The input side is connected to single phase grid with parameters as 230V, 50Hz.

Design the supply to give following specifications:

1. Component selection and justification
2. Passive component designs including filters
3. Controller design
4. Simulation results
5. Validation with the design criterion

- The simulink model built for the above design is shown below :-

- All the parameter blocks are shown below :-

- AC voltage source :-

- Diode :-

- Ls :-

- MOSFET :-

- Cdc (Load side capacitor):-

- R load :-

- Fourier :-

- PID :-

- PID 2 :-

- MATLAB code :-

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

- Input voltage, input current and output voltage :-

- Zoomed out :-

- Zoomed in :-

- Power factor :-

- Part B:

Design a high-performance high voltage DC power supply for 15 kV dc output and load in the range of 0-10A. The supply should meet the harmonic standard limits for input power quality such that current THD limits are satisfied with input power factor >0.98 value. The input side is connected to three-phase LV grid with parameters as 11kV (line-line), 50Hz.

Design the supply to give following specifications:

1. Component selection and justification
2. Passive component designs including filters
3. Controller design
4. Simulation results
5. Validation with the design criterion

- Typical output voltages for high voltage power supplies are 1kV to 360kV, although ranges of 62V to 500kV are offered. Spellman's range of output power spans from less than a watt to over 200 kilowatts.

- HVDC allows power transmission between AC transmission systems that are not synchronized. Since the power flow through an HVDC link can be controlled independently of the phase angle between source and load, it can stabilize a network against disturbances due to rapid changes in power.

- The simulink model built for the above designed rectifier is shown below :-

- Three-phase AC voltage source :-

- Thyristor :-

- MATLAB code :-

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

- Zoomed out :-

- Zoomed in :-

- The Three-phase PFC is not discussed properly in the videos and not in the scope by the instructor so designed an fully controlled HVDC transmission.