ECE 422 – Power System Operations & Planning / 

ECE 522 - Power Systems Analysis II
Spring 2014

Voltage stability slides posted

Cascading failure slides posted

Homework#5 (due by 4/15) on small-signal stability and slides on transient stability uploaded

Solution of Exam 2 posted



Meeting Time and Place        

9:40-10:55AM on Tuesday & Thursday at MK406

January 09 – April 24 (about 26 lectures)



Kai Sun (Email:  Phone: 865-9743982)

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

GTA: Nan Duan (


Course Texts/Materials/Resources



ECE 421/521 – Electric Energy Systems/Power Systems Analysis I


Course Description

This course will mainly cover modeling, analysis and mitigation of power system stability and control problems. Planning and operations of a modern interconnected power grid under disturbances to ensure system performance and reliability will also be covered. Students will learn both analytical and numerical methods to tackle realistic power system stability and control problems. There will be minor work of programming in MATLAB or using professional power system simulation software. Students are also encouraged to review literature on recommended topics to gain deeper insight on emerging techniques on power system operation and planning.


Course Objectives 
Upon completion of this course (and the pre-requisites to this course), every student should have gained: 

·         An understanding of reliable and economic power system operations and fundamental techniques for modeling and analysis of stability and control problems

·         A broad familiarity with engineering categories, criteria and control measures on power system stability issues e.g. 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 (Ref: Kundur – Ch. 1-2) (slides: course introduction; background: 1/9-1/16)

o   Structure of a power system

o   Overview of operating states and control actions (NERC reliability guidelines)

o   Introduction of power system stability problems (basic concepts and definitions; examples on stability problems)

·         Power system modeling (Ref: Kundur – Ch. 3-5&7; Saadat – Ch. 8)

o    Modeling of a synchronous machine (Park’s transformation; equivalent circuits; classic and detailed models; equations of motion) (slides: 1/30-2/11, 2/18-2/25)





Due Date


·         Learn the IEEE paper “Definition and Classification of  Power System Stability” and write an essay to review 1 journal/conference paper on power system stability (homework description; sample)

1/23 (Thur.) in the class, give a 3-5 min talk on your review and hand in your essay. Email me the paper title by 1/22


·         Description (round rotor flux linkage and voltage equations; dq0 currents)

·         Solution

2/13 (Thur.) hand it in in class or send to and cc


·         Homework on synchronous machine and load modeling

·         Solution

3/11 (Tue.) hand it in in class or send to and cc


·         Problems 12.3 and 12.5~12.10 in Saadat’s book (3rd ed., Page 619) (photocopy)

4/1 (Tue.) hand it in in class or send to and cc


·         Problems 11.10~11.13 in Saadat’s book (3rd ed., Page 562) (photocopy)


4/15 (Tue.) hand it to Nan or send it to and cc


·         Problems: 11.14-11.17 in Saadat’s book (3rd ed., Page 562) (photocopy)

4/29 (Tue.) hand it to Nan or send it to and cc


Course Project


Choose one from these two problems:

1.      Contingency Ranking By Time-domain Simulations Considering Different Load Models (draft description)

2.      Estimation of the Security Region for Grid Operations (draft description)


Course Requirements



Homework - 20% 
Course Project - 20%
Exams - 30% (15% each)
Final Exam - 30%

A few course policies