Power Electronics

IN-COURSE ASSESSMENT (ICA) SPECIFICATION

Module Title: Power Electronics

Module Leader: Dr Maher Al-Greer

Module Code: EAC4025-N

Assignment Title: Coursework report

Deadline Date: 11/12/2020 4PM

Deadline Time: 4:00pm

Submission Method: Online (Blackboard) 

Online Submission Notes:

 Please follow carefully the instructions given on the Assignment Specification

 When Extenuating Circumstances (e.g. extension) has been granted, a fully completed and signed Extenuating Circumstances form must be submitted to the School Reception or emailed to [email protected].

FULL DETAILS OF THE ASSIGNMENT ARE ATTACHED INCLUDING MARKING & GRADING CRITERIA

Power Electronics: EAC4025-N

Design and Operation of Line/Self-commutated Converters

Submission date: 11-12-2020, at 4.00 pm.

Description

In this assignment, students are required to investigate design and control features of

Line/self-commutated converters; namely, AC-DC and DC-DC SMPS converters. You

are required to carry out the experiments using MATLAB environment and to write a

comprehensive report highlighting the main design and control features of this type of

converters.

You are expected to perform independent research and further study as appropriate

to aid completion.

A- For AC-DC converter with the following circuits only; Fully controlled two-pulse

bridge, and Fully controlled six-pulse bridge; you should investigate:

 The effect of the load on converter output waveforms.

 The effect of changing the phase-control angles on input power for R and R/L

load.

 The frequency spectrum of the input current and input voltage for R and R/L

load.

 Control characteristic.

B- Simulate the AC-DC circuit shown in Figure 1; By reviewing the literature

you should investigate:

 The effect of the input filter inductor (𝐿𝑖𝑛) on the converter output waveforms.

Also, determine and discuss the frequency spectrum of the input current and

input voltage. (Investigate with the following values: 1- 𝐿𝑖𝑛 = 1 𝜇H; 2- 𝐿𝑖𝑛 = 5

𝜇H; 3- 𝐿𝑖𝑛 =10 𝜇H).

 The effect of output capacitor (𝐶) on the output voltage and current. (Investigate

with the following values: 1- 𝐶 = 500 𝜇F; 2- 𝐶 = 1000 𝜇F; 3- 2000 𝜇F).

Figure 1: AC-DC Converter

Circuit values: 𝑉𝑠 = 325 𝑉, 𝑓 = 50 𝐻𝑧, 𝐿𝑖𝑛 = 1 𝑢𝐻, 𝑅𝑖𝑛 = 1𝑚 Ω, 𝐶 = 1000 𝑢𝐹, 𝑅 =

10 Ω.

C- For DC-DC converter with buck circuit only, you should investigate:

 The effect of the load on the converter output voltage and inductor current.

(Investigate with the following values: 1- 𝑅 = 10 Ω; 2- 𝑅 = 25 Ω).

 Device selection (Inductor and capacitor) in relation to converter output voltage

and inductor current.

 The effect of the switching frequency on the inductor current and output voltage.

(Investigate with the following values: 1- 𝑓𝑠 = 10 kHz; 2- 𝑓𝑠 = 40 kHz).

Report Structure

The report should adhere to the following guidance:

 The report should have a title page and a contents page, and each page should

be numbered.

 Aside from the title and contents pages, the report should be a maximum of 20

pages long including equations, figures, illustrations and tables.

 One additional page may be used to list references – which should follow the

university standard.

 Figures and tables should be numbered and should have a caption describing

the figure/table. The caption should also indicate the primary feature that should

be observed by viewing the figure/table. Figures should also be neat and of a

readable size.

Brevity is commendable. Appendices should be used for additional information such

as extracts from data sheets. It is important that the report be readable and

understandable without reference to the appendices.

Marking Scheme

1) Laboratory experiments: 15% of available mark awarded based on the results

in the report.

2) Discussion of results: 50% of available mark. (20% Part A; 15% Part B, 15%

Part C).

3) Active Participation: 20% based on your active participation in laboratory

work.

4) Quality of the report (structure, literature review and presentation): 15% of

available mark.

Note:

- Answers of the active participation questions should be sent to the lab tutor.

- Simulink file for part B should be submitted with the report via blackboard link

provided in the module sit.

- Feedback sheet is attached in module site in Blackboard.

- Report should be submitted through blackboard in the link provided in the

module site.

- Assessing learning outcomes: 1, 2, 3, 5, 6, 7; See module handbook.