Kindly see attached. Due in 24 hrs. Contact me after you have read the paper and that you can do it.
Cal Poly Pomona ECE 5750 Distribution system and power quality – Instructor Dr. Ha Thu Le 1
California State Polytechnic University Pomona
Department of Electrical and Computer Engineering
ECE 5750 Distribution system and power quality – Spring 2020
Project
Project requirements:
1. The project must be completed using MATLAB/Simulink/Simscape Power Systems. Analytical hand
calculation may be used for analyses and for presenting the results in the project report. You can work
alone or in a group of two partners.
2. Submit your project report via email to the instructor by midnight on the due date.
3. Save your Matlab code (for Part 1) and Simulink project (for Part 2) with a name in the format
5750_yourlastname_firstname_Project.m or .slx and submit them via email to the instructor. If you
work with a partner, the file name should be 5750_lastnamePartner1_lastnamePartner2_Project.m
or .slx.
1. Design of a distribution system
Design a small distribution system which has realistic features. The main requirements are as
follows:
1) The system must have at least two feeders which are 3-phase or 3-phase 4-wire, with or
without 1-phase and 2-phase laterals. Each feeder must have 3 or more buses, and at
least two loads which are connected to two different buses.
2) The system must have a substation (e.g. 34.5kV/4.16kV) and some service transformers
(e.g. 4.16kV/240-120V. The service transformers must accommodate loads of residential
customers i.e. both 240-V and 120-V loads.
3) The power lines must have specified configuration, conductor type for phase and neutral
conductors (e.g. overhead line in Problem 1 of Homework 1), and length. They can be
overhead or underground lines, or combination of them.
4) The system must have at least one constant PQ load and one induction motor. The
system total load power factor must be in the range of 0.85-0.95 lagging.
5) The system data (transformers, lines, loads etc.) may be taken from textbooks or other
sources. Provide the data in Table 1. Also provide in “Reference” section at the end of
the project report the sources where the data are obtained.
Perform the following tasks:
1) Draw one-line diagram of the distribution system. It must show all pertinent components
including location of loads, and must specify each line segment in terms of length and
phases present (e.g. segment 1-2 is 2-mile long and has all phases a-b-c present while
segment 2-3 has only phases a-c present). Refer to the diagram of a typical feeder in the
textbook for reference.
2) Using ladder iterative technique, calculate the voltages at all buses for one feeder
selected from your designed system. This calculation MUST show that the voltage at the
Cal Poly Pomona ECE 5750 Distribution system and power quality – Instructor Dr. Ha Thu Le 2
end of the feeder is 0.95pu or a little higher under peak-load condition. Assume that the
output voltage of the substation that serves the feeder is at the rated value. Specify the
tolerance for iteration and use sweep matrices for all components present on the feeder.
Adjust the system design if the requirement is not met. Write a Matlab m-file for this
calculation then submit the code.
Hint: Select the feeder that does not have a step-voltage regulator or induction motor to
simplify the calculation. For line model, neglect the shunt admittance if you use overhead
lines.
Table 1 Distribution system parameters
Transformer data
Substation ratings, impedance
Service transformer ID, ratings, impedance
Line data
Line ID, length, impedance, conductor type
Load data
Load ID, type, power, power factor
2. Simulation and analysis of distribution system
Perform the following tasks:
1) Build your designed distribution system using Simscape Power Systems. Simulate the
system and record all bus voltages to show that they are within the limits of +/-5% of the
nominal values (i.e. 0.95-1.05 pu). Save and submit the project file.
2) Improving system load supply capability: Using simulation, maximize the total load
that your system can supply. Add step-voltage regulators and/or capacitors to raise the
system voltages. You must ensure that the system total load power factor is in the range of
0.85-0.95 lagging and the system bus voltages are within the limits. Record the system
loads and voltages for Part 1 and 2 in Table 2.
Table 2 Simulation results
Original system Improved system
Bus #
Voltage
pu
Load
kVA
Voltage
pu
Load
kVA
. . . . . . . . . . . . . . .
Total load
Cal Poly Pomona ECE 5750 Distribution system and power quality – Instructor Dr. Ha Thu Le 3
Guide for simulation:
1) Building the grid: ADD a FEW COMPONENTS at a time. Then, run simulation to verify that
the system works normally and fix errors if any. Proceed if the system performs as expected.
2) Save your project file EVERY TIME you change a parameter before running simulation.
3) Add only components from Simscape Power Systems (NOT from other Simscape folders)
and general Simulink folder.
4) The simulation time is typically between 5-30 seconds to allow the transients to die out and
the system to reach the steady state. Use ODE23tb or ODE23t as solver to reduce the time
it takes the system to simulate.
5) Initialization of the system for simulation:
To start the simulation in steady state, you must initialize machines (synchronous and/or
asynchronous motor) for the desired load flow (a required initial state). Open the Powergui
and select “Load Flow & Machine initialization”. Click “Update Load Flow”, then close the
dialog box and close the Powergui.
Alternatively, click “Initial States Setting” then under “Force the initial electrical states” check
“To Steady State”, click “Apply” then “Close”. Perform this step ONLY if you observe
abnormal behavior in simulation after you add a component or make a change to the
power system.