EEET2389 : Power Electronic Converters - Engineering Assignment Help

Assignment Task:

Task:

This assignment covers the four main topics covered in EEET2389 during the semester:

• DC-DC and DC-AC converter topologies • Single and three phase modulation principles

• Single and three phase linear current control

• Single and three phase non-linear current control This is a time-limited open book assignment. The time-limit is set in Canvas. Complete ALL questions.

The following is allowed:

• You are allowed to use simulation tools like Powersim PSIM and Mathworks MATLAB to aid your work.

• You are allowed to use numerical aids like Mathworks MATLAB and Wolfram Alpha to aid you with numerical calculations and approximations.

• You are allowed to use any calculator

. The following is NOT allowed:

• You are not allowed to communicate or discuss with anyone regarding the problems or the solutions to the problems contained within this assignment. • You are not allowed to post the problems on any online forum.

• You are not allowed to pay or get another person to prepare your assignment.

• You are not allowed to submit work prepared by another person.

• You are not allowed to copy other people’s work. A breach of any of the above may result in disciplinary action in accordance with the University policies relating to assessment and academic integrity

Q1. A 1.5kW boost DC-DC converter includes a low-side MOSFET with an on-state resistance equal to ( ) RDS on =120mΩ and a high-side diode with an on-state forward voltage equal to VF =1.8V . The converter is used to synthesise a DC-link voltage equal to 480V from a fuel cell, which can operate over the range of 120V to 150V . The minimum load for the converter is 75W , and the converter is switched at 50kHz .

1.a. Explain why boost converters with low-side active switches are used in preference to topologies with high-side active switches. [8 marks]

1.b. Select an inductance value that guarantees the boost converter can operate in the continuous conduction mode across the full input voltage range of the fuel cell. [8 marks]

1.c. Determine the conduction losses in the MOSFET and the diode for the maximum input voltage and rated output power operating condition. [10 marks] The boost converter is now loaded with a pure resistive load equal to 3.9kΩ only.

1.d. Calculate the duty cycle required to produce the target output voltage for the maximum input voltage condition. [6 marks]

1.e. Plot simulated time domain waveforms for the boost converter for the operating condition in part

1.d. over two complete switching cycles. Show the switched voltage across the MOSFET, the voltage across the diode and the inductor current.

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