BGEE2614 Electrical Power Systems

FACULTY OF ENGINEERING AND TECHNOLOGY

DEPARTMENT OF ELECTRICAL & ELECTRONIC ENGINEERING

BGEE2614 ELECTRICAL POWER SYSTEMS

LAB-BASED ASSIGNMENT

Date of issue:

Week 3

Date of submission:

Week 6

Date of feedback:

Week 10

Coursework % weighting:

30% of total coursework marks

Asessement type:

Students have to complete given tasks. It is a group  assignment. Maximum 4 students are allowed in a group. The report must be submitted in typewritten in a document format (around 2000 words SOFTCOPY) specified by the laboratory instructor. 

The report presentation format:

Times New Roman, font size 12, spacing 1.5

You may need to include the objectives, circuit construction/ procedures, data collection, results, analysis/ discussion, and conclusion in your report. You may refer to the assignment rubrics for the mark allocation of the report.  

Plagiarism is strictly prohibited. If plagiarism is detected, all the involved students will be given ZERO mark. Student(s) with suspicious report / assignment answer will be called for an oral exam to prove the originality of their work.

Assignment

As three-phase systems show either inductive or capacitive performance, depending on the load, a reactive power compensation in the line is required for reasons of stability when transmission lines beyond certain length are used. There are three sizes of transmission line: short, medium and long. Short transmission line is usually applied to overhead 50-60 Hz lines less than 80 km long. Medium-length lines is typically ranging from 80-250 km at 50-60 Hz. It is also known as nominal π circuit. Long line which is also known as equivalent π circuit, normally for line more than 250 km. In practice, power lines are not operated to deliver their theoretical maximum power. 

Figure 1 is 3 buses system. Bus 1 is connected to the utility (Source). A generator is connected to Bus 2 and Bus 3 provides power to the load. A transmission line (from Bus 2 to 3) and transformer (from Bus 1 to 3) build up the network. A switched shunt is shunted to boost bus voltage at bus 3 as well as the load. The parameters of the components are listed as below:

  • Bus 1 o Voltage: 69 kV / 1 p.u.
  • Bus 2

o Voltage: 13.8 kV / 0.995 p.u.

  • Bus 3 o Voltage: 13.8 kV
  • Generator (Slack) o SetPoint Voltage: 1 p.u. o Available for AVR: Selected
  • Generator o Power: 2 MW o SetPoint Voltage: 0.995 p.u. o Available for AVR: Selected
  • Load o Power: 7 MW & 6.3 MVar
  • Switched Shunt o Power: 6 MVar o Control Mode: Fixed
  • Transmission Line o The per unit impedances: 0.06+j 0.12 for 50 km o Limit A (MVA): 10
  • Transformer o The per unit impedances: 0.03+j 0.53
    • Limit A (MVA): 10 o Off nominal turn ratio: 1.01 o Phase shift: 0
    • Available for AVR: Selected

By using PowerWorld simulator software and the aforementioned parameters which applied to Figure 1, you are required to:

  • investigate the operating characteristics in transmission line of different length for the circuit, and,
  • investigate the maximum MW of the load that the supply can withstand. [Note that all data must be displayed in 4 decimal places]
BGEE2614 Electrical Power Systems img1

Figure 1

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