Master of Engineering
(Electrical Systems)

Master of Engineering (Electrical Systems) 2
MEE511_Assessment3_PaperA_v2
Assessment Instructions:
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understand your requirements and responsibilities as a student of EIT.
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Master of Engineering (Electrical Systems) 3

Please complete your answers on the assessment cover page document available on Moodle.
Clearly label your question numbers (there is no need to copy the full question over). Include all working
out.
Task 1: (40 marks)
Design a solar PV system for a rooftop mounted system for the loads, whose details are given in
Table 1. The minimum sunshine hours may be assumed as 5 hrs. Select a 24V DC as the system
voltage.
Given:
• Solar PV panel to be used are: Wp = 80 W, Vm = 17.6 V, Im = 4.55 A
• Operating factor = 0.8
• Battery efficiency = 85%
• Inverter efficiency = 95%
• Charge controller efficiency = 95%
• Days of autonomy = 1
Use PV module: “BP380” from BP Solar, whose data are given below:
• Peak power = 80 Wp
• Voltage at peak power (Vpp) = 17.6 V
• Current at peak power ((Ipp) = 4.55 A
• Assume operating factor of 0.8
Master of Engineering (Electrical Systems) 4
MEE511_Assessment3_PaperA_v2
Table 1: Rooftop mounted solar PV system load details
Assume the following Energy flow diagram:

Assume that the annual energy requirement of an industry is 20,000 kWh. What should be the size
of wind turbine that is required to be installed to meet energy requirement?
The following assumptions are take into account for estimation:
• Annual energy requirement – 20000 kWh
• Propeller type wind machine is used
• Coefficient of performance – 0.40
• Wind speed at 15 metre height is 5 metres/sec (if the turbine hub is placed at the height
other than 15 metres, the wind speed should be estimated as shown in ‘vertical wind speed
variation section’)
• Density of air – 1 kg/m3
• Capacity factor – 0.30 (i.e. 30% of the time, wind machine is producing energy at rated
power)
• Number of hours in a year – 8760 hours
Master of Engineering (Electrical Systems) 5
Task 3:
Grid Integration Studies of PV System using PowerFactory
Import the 14 Bus System.pfd model (from the examples given) and initially observe and go through
load flow analysis report. The IEEE 14-bus test case represents a simple approximation of an electric
power system from the USA as of February 1962. It has 14 buses, 5 generators, and 11 loads.
Note i) To get a quick start with PowerFactory software, you may watch the followig EIT workshop:
https://au.bbcollab.com/recording/6a16962878e84226b98297185dafbf58
Note ii) To learn how to run the load flow analysis, go to the below link:
https://youtu.be/MBS9hJkVKPw
Note iii) To learn about creating a project and build a power system using PowerFactory 2020, go to
the below link.
https://youtu.be/py0a-OKu8Zg
Note iv) To learn how to use RMS/EMT simulation and plot graphs, go to the below links:
https://youtu.be/I2r7VnSZJW8
Master of Engineering (Electrical Systems) 6
MEE511_Assessment3_PaperA_v2
https://youtu.be/31kRgWi1hJY
Activate a case by right-clicking and selecting activate. Before running the simulation, make sure
you are comfortable with using PowerFactory.
In the model, Rectifier DC Motor 1 is active. Follow Steps 1 and 2 as listed below:
Step 1. Click Calculation: Load Flow and then click Execute for a balanced positive sequence
system.
Step 2. View the two tabs next to the graphical view of the grid for voltage profile and real and
reactive power generations at all the buses.
a) Run the load flow analysis. Do all the bus voltages satisfy the ±5% tolerance limit? Identify
the buses which violate the grid rules. Now, run the hosting capacity analysis for the
distributed energy resources (DERs) for all the hosting sites (all buses). Tabulate the
maximum active power limit considering the thermal limit only while determining the
hosting capacity. Use simulation plots as needed. (10 marks)
b) From the generator supply profile, comment on the real power and reactive power feed
from the generators. Do all the generators contribute in supplying reactive power in the
grid? Comment on their contribution. Is there any significance of the reference machine in
this profile? Use simulation plots as needed. (5 marks)
c) Now replace the synchronous generators by PV generators one by one and play around with
the active power feed in to the grid from PV systems to meet the load demand. For PV
integration into the grid, use the PV systems from the “templates” which ensures the PV
panels are integrated with built-in controllers. Do not use the PV system as the static
generator. Now run and observe the voltage level variation from the base values of voltages
and tabulate the differences. Consider the PV power factor to be 0.95. You may use
transformers if required for the integration of PV system to the existing grid (bus).
The simulation study demonstrates the stability issues created by the gradual replacement
of synchronous generators by the PV systems. In this above mentioned circumstances,
i. Is it possible to supply the whole load demand (real and reactive power demand) by
100% renewable energy resource (i.e. PV penetration level of 100%) maintaining the
voltage stability of the system considering no additional investment in FACTS devices? If
not, what could be the maximum possible PV penetration for this grid? Show necessary
figures and graphs to demonstrate the issue of voltage instability.
Master of Engineering (Electrical Systems) 7
ii. What could be the possible ways to solve this instability issue while integrating more
and more PV systems gradually? Discuss in brief. (10 marks)
d) RMS/EMT simulation study (10 seconds):
Assume a motor load of 25 MW gets connected at bus no. 13. Design the RMS/EMT
simulation mechanism in a way to run the simulation for 10 seconds only. In this window,
the motor gets connected at the 5th second. Now,

END OF ASSESSMENT
Master of Engineering (Electrical Systems) 8
MEE511_Assessment3_PaperA_v2
Marking rubric: