ECE 522 – Power Systems Analysis II

Spring 2017

Final Exam on May 2nd (Tuesday) at 12:00-2:00pm



Time and Place          

12:40-13:55 on Tuesday & Thursday at MK419

January 11 – April 28 (about 26 lectures)



Kai Sun (Email:  Phone: 865-9743982)

Office hours:  Thursday 3:00-4:30pm (or by appointment) at MK612

GTA: Weihong Huang (; MK207)


Course Texts/Materials/Resources



ECE 421 (Electric Energy Systems).


Course Description

This course will cover fundamentals on power system modeling for the purposes of dynamic studies and stability control, teach the methods for analyzing main stability issues of power systems and introduce the tools for planning and operating a modern interconnected power grid to meet reliability criteria under disturbances. There will be minor programming work in MATLAB or using professional power system software. Students are also required to review literature on recommended topics to gain deeper insight on emerging techniques on power system stability and control.


Course Objectives 
Upon completion of this course, every student should have gained: 

·         An in-depth understanding of basic approaches for power system modeling, analysis and control

·         A broad familiarity with engineering categories, criteria and control measures on power system stability issues including small-signal stability, transient stability and voltage stability

·         Knowledge in emerging techniques for planning and operating modern interconnected power systems


Course Outline

·         General background on modern power systems

o   Overview of modern power system operations and planning (NERC reliability guidelines) (slides: 1, 2)

o   Classification and definitions of power system stability problems


·         Power system modeling

o    Modeling on synchronous machines (Park’s transformation; equivalent circuits; classic and detailed models; equations of motion) (slides: 1, 2, 3)

o    Modeling on loads (static and dynamic load models; acquisition of model parameters) (slides)

o    Modeling on frequency regulation (governing systems; AGC) (slides: 1, 2, 3, 4)

o    Modeling on voltage regulation (excitation systems; var compensation) (slides: 1, 2)


·         Power system stability problems and control measures

o    Small-signal stability (power oscillation in interconnected systems; power system stabilizer) (slides: 1-2, 3, 4, 5)

o    Transient stability (direct methods; numerical methods) (slides: 1, 2, 3)

o    Voltage stability (voltage collapse; analysis methods and mitigation measures) (slides: 1, 2)


·         Emerging topics on grid operations and planning

o    Cascading outages (slides)

o    Impacts from high penetration of intermittent renewable resources


-   Quiz 1 solution

-   Quiz 2 solution

-   Quiz 3 solution

-   Quiz 4 solution

-   Quiz 5 solution

-   Midterm Exam on March 9 (Thursday) at 12:40-2:40pm. It is a closed-book exam and each student can only bring a calculator and two summary sheets (letter-size, double-side). Solution

-   Course project presentation in late April

-   Final Exam on May 2 (Tuesday). Solution





Due Date


·         Learn the IEEE paper “Definition and Classification of  Power System Stability”

·         Select one IEEE PES journal/conference paper published after 2014 that studies or controls some stability problems of bulk power systems (not microgrid or distribution systems)

o   Source:  or

·         Write a 1-2 pages essay (not Q&A’s):

o   Title, authors, source of the paper

o   Background:

§  What stability problem is concerned? (Which IEEE categories?)

§  Why is the problem significant? (Any real-world stories?)

o   Approach

§  What new approach or technique is proposed? (Outline of the procedure or steps)

§  How does the new approach perform?

o   Remark

§  Any conclusions from the work, or any room for further work

Give a 5-minute presentation (3-5 slides) on your chosen paper and hand in your essay in the class of 1/24 (Tuesday).


·         Description (round rotor flux linkage and voltage equations after Park’s transformation)

·         Solution

1/31 (Tuesday) hand it in in class or send to GTA


·         Description (generator and load modeling)

·         Solution

2/9 (Thursday)


·         Problems 12.3 to 12.11 on Saadat's "Power System Analysis" book

·         Also finish two additional problems

·         Solution

3/2 (Thursday)


·         Problems

·         Solution

4/6 (Thursday)


·         Problems 11.14 to 11.17 on Saadat's "Power System Analysis" book

·         Solution

4/20 (Thursday)


·         Problem

·         Solution

4/27 (Thursday)


Course Requirements


Homework:                  20% 

Quizzes:                       20% 

Course project:             20%

Exams (2):                    40% (20% each)

In-class Participation    5%

Total                            105%