Homework #3
(ECE552 students need to finish all questions; ECE422 students who finish the highlighted questions that
are required for ECE552 only will receive up to 10% more points.)
Consider the following equivalent circuits for a 384 MVA, 24kV, 0.85 pow
Solution to question 1:
Adding a new concentrated field winding G on the q-axis of the rotor to eliminate difference
between d and q axes, the flux equations could be written as:
a l aa
l
b ba
c l ca
F = l Fa
D l Da
G lGa
l
Q Qa
l ab
l ac
l aF
l
Homework #2
Question 1: Develop the flux linkage and voltage equations for a round rotor machine.
As shown in the figure, for a round rotor machine, add another damper winding G to the q-axis
of the rotor.
Then, the flux and voltage vectors become:
For a
ReviewofPaperEnhancementofPowerSystemStabilityUsingAdaptive
CombinationalLoadSheddingMethod
RiyasatAzim,mazim@utk.edu
Informationofthepaper
Alireza Saffarian and Majid SanayePasand, Enhancement of power system stability using
adaptive combinational load s
Homework #1
Learn the IEEE paper Definition and Classification of Power System Stability
Select 1 journal/conference paper published by IEEE since 2010 that introduces
or addresses some stability problems on bulk power systems
Source: http:/ieeexplore.
ECE 422/522
Power System Operations & Planning/
Power Systems Analysis II
4 Active Power and Frequency
Control
Spring 2014
Instructor: Kai Sun
1
References
Chapter 12 of Saadats book
Chapter 11.1 of Kundurs book (understand examples)
Chapter 4 (Frequen
From now, we ignore the superbar - with variables in per unit.
0
d
F
=
D
q
Q
L0
Ll + Lad
Lad
Lad
LF
Lad
MR
Lad
MR
LD
Ll + Laq
Laq
41
i0
i
d
iF
iD
Laq iq
LQ iQ
Equivalent Circuits for d- and q-axes
ed = -rq -Raid + pd
= -rq
ECE 422/522
Power System Operations & Planning/
Power Systems Analysis II
1 General Background
Spring 2014
Instructor: Kai Sun
1
Outline
Structure of a power system
US Electric Industry (utilities, deregulation, energy
resources)
Overview of power syst
ECE 422/522
Power System Operations & Planning/
Power Systems Analysis II
3 Load Modeling
Spring 2014
Instructor: Kai Sun
1
References
1. Load Performance for Dynamic Performance Analysis, IEEE Committee Report, IEEE
Trans. on Power Systems, Vol. 8, No. 2
ECE 422/522
Power System Operations & Planning/
Power Systems Analysis II
2 Synchronous Machine Modeling
Spring 2014
Instructor: Kai Sun
1
Outline
Synchronous Machine Modeling
Per Unit Representation
Simplified Models for Stability Studies
2
Synchronou
ECE422/522 Course Project
Choose one from two practical industry problems:
Contingency ranking by dynamic simulation software
considering different load models
Estimation of the secure operating region
1
Group
1
Osipov, Denis
Dave, Rohan P.
Zhou, Dao
2
MIDTERM EXAM 1 SPRING 2014
ECE 422/522
NAME:
BE SURE TO SHOW YOUR WORK CLEARLY AND FULLY. SHOWING YOUR THINKIING HELPS
YOU GET MORE POINTS.
All questions are required for both ECE422 and ECE522 students. ECE422 students will receive 10% more
points.
1 and
Synchronous Machine Equations
April 23, 2012
SOME BACKGROUND MAGNETIC CIRCUITS
Magnetic Circuit for High Permeability Core
Rc =
Lc =
=
1
Pc
N2
Rc
=
F = NI =
lc
Ac
N 2 Ac
lc
= Rc
lc
Ac
Faradays Law
V=
d
dt
SYNCHRONOUS MACHINES
Electrical to mechanical conv
HW#3 Solution
Consider the real power state estimation problem using the DC load flow
model. The IEEE 30-bus system one line diagram (also called the New England Test
System) is sketched once in full and again showing only the lines with real power
m
ECE522 Homework#10 Solution
Qinran Hu
May 1, 2012
Question 1. Phase Distance Protection
a) Impedance setting for instantaneous zone 1 with 80% reach
B 21 Z = 0.8|ZL2 | = 0.1608pu = 47.848
B 22 Z = 0.8|ZL1 | = 0.3216pu = 95.696
B 41 Z = 0.8|ZL3 | = 0.0800p
PRACTICE MIDTERM EXAM 2 SPRING 2011
ECE 522
NAME:
1. Swing Equation (20 points): A generator is connected to parallel transmission lines as
sketched below. A fault occurs at the location indicated in the diagram. When the fault is
cleared this line is tak
PRACTICE MIDTERM EXAM 2 SPRING 2011
1. Swing Equation
Swing Equationt:
f
.
Pm
H
60
3
Pe
0 .5 Pe
Pre-fault:
X eq X t X L 2 0.2 0.8 2 0.6 pu
Pe
E V
X eq
sin Pe
.
E V
1 .1 1.0
X eq
60
3
0.5
sin
1.1 1.0
sin 1.83 sin
0.6
0.5 1.83 sin
sin
0
0.6
Project 2 Security Region for Grid Operations
Problem and Approach:
Consider a two-area power system. The base-case powerflow and dynamic data in PSS/E format
will be provided.
Consider 10 seconds time domain simulations for three critical contingencies:
Project 1 Contingency Ranking by Time Domain Simulations
Problem and Approach:
Consider the 179-bus WECC system model. Powerflow and dynamic data in PSS/E format will
be provided.
Its loads can be represented by one of the following load models:
Load Mode
ECE 422/522
Power System Operations & Planning/
Power Systems Analysis II
Spring 2014
Course Outline
Instructor:
Kai Sun
1
Information
Contact:
Email: kaisun@utk.edu Tel: 865-9743982
Office hours:
Thursday 3:00-4:30pm/by appointment @ MK612
GTA:
Nan Du