Power System Analysis

Timothy L. O'Hearn, PE

Course Outline

This 15-hour course provides a thorough study of the power system data necessary, and the methods commonly used in analysis of power systems utilizing computer software. The following types of studies are covered: short circuit, load flow, motor starting, cable ampacity, stability, harmonic analysis, switching transient, reliability, ground mat, protective coordination, power system modeling.

The course materials are based entirely on the "IEEE Recommended Practice for Industrial and Commercial Power System Analysis", IEEE Std. 399-1997.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

Learning Objective

At the conclusion of this course, the student will be familiar with:

• · Understand the purpose for and techniques involved in power system studies;
• Principles involved in data acquisition in support of power system studies;
• The purpose of system studies during the design stage of power distribution systems;
• The purpose of system studies for existing power distribution systems;
• The advantages of power system analysis software in the design of complex modern power systems;
• The benefits and restraints associated with the critical analytical solution methods that are available or are the basis for valid techniques in solving power system problems;
• The techniques involved in modeling a power transformer;
• The techniques involved in modeling overhead power lines;
• The per unit system for expressing variables in power system calculation;
• The purpose for and the techniques involved in a transformer tap study;
• The critical aspects of a system load flow study and its use in power system design;
• Use of the load flow study to access power system performance and voltage profiles;
• Understand the concept of Thevenin's equivalent;
• The purpose for and techniques involved in short circuit analysis;
• The purpose for and techniques involved in determining the dc component of fault current;
• The concept of and the techniques for power system modeling;
• How to model power system loads and their differences for power system calculations and studies;
• How to model generators in power system calculations and studies;
• The methods utilized by computer programs for power system analysis;
• The various factors affecting the results and accuracy of short circuit studies;
• The salient principles, methodologies, and computational procedures suggested by the North American IEEE and ANSI C37 standards;
• The international standard for short circuit calculations (IEC 60909, 1988) and the conceptual and computational deviations from C37 standards;
• The definition of stability, steady state stability, transient, and dynamic stability;
• The use of stability studies to determine load-shedding schemes and critical fault clearing times for setting protective relays;
• Starting torque analysis for electric motors and the need for motor starting studies;
• The use of motor starting studies to determine power system performance;
• The use of motor starting studies to select the optimum starting method, the motor design requirements, and the system design requirements to minimize the impact of motor starting on the entire power system;
• The use of motor starting studies to determine if a starting device is needed and its characteristics and ratings;
• The information required for performing motor starting studies and some common assumptions used in the absence of more precise data;
• The concepts involved in studies of harmonic analysis of industrial and commercial power systems;
• The need for harmonic analysis and recognition of potential problems in power systems;
• The required data for harmonic analysis, corrective measures that can be taken, and the benefits of using a computer as a tool for harmonic analysis;
• The classical analytical methods used to solve switching transients;
• Typical circuit parameters used for transient studies;
• Power system reliability assessment and evaluation methods based on probability theory;
• The use of reliability indexes for different system designs to evaluate the impact on service reliability and cost of changes in component reliability;
• The FMEA (failure mode and effects analysis) for power distribution systems;
• The solution of cable ampacity problems with computer software systems with emphasis on underground installations;
• The various items that affect cable ampacity;
• Primary purpose of a ground mat study;
• The theoretical background behind ground mat studies and its application in the design of ground mats by computer program;
• The objective of a protective scheme in a power system;
• The application of computer and computer software to time-current coordination studies;
• Basics of coordination;
• How to make use of coordination software; and
• Application of dc power system analysis.
  
  

Intended Audience

The intended audience is professional electrical engineers, project managers, and project engineers, involved in the analysis, engineering, and design of industrial and commercial power systems..

Benefit to Attendees

A better understanding of the purpose for and the techniques involved in power system studies. The course material can be used as a reference source for system and data acquisition for engineering consultants performing necessary studies prior to designing a new system or expanding an existing power system.

Course Content

The purpose of the course is to provide recommended practices, methods, and a reference tool for the analysis of commercial and industrial power systems. You are required to obtain a copy and study the IEEE Recommended Practice for Industrial and Commercial Power System Analysis IEEE Std. 399-1997 as well as the lecture notes provided in the course material, which provide additional guidance and recommendations by the author of the course. The recommended practice, commonly known as the "Brown Book" is intended as a practical guide for power system analysis theory and its application in the computer aided analysis of electric power systems. The Brown Book is a useful reference tool that every practicing electrical engineering professional should have access to.

The IEEE Recommended Practice for Industrial and Commercial Power System Analysis", IEEE Std. 399-1997 can be purchased from the following websites:

http://shop.ieee.com/
http://www.global.ihs.com/

The Author also prepared lecture notes to guide the study of above course materials.

Lecture Notes

IEEE Recommended Practice for Industrial and Commercial Power System Analysis
IEEE Std. 399-1997

Table of Contents

Chapter 1 - Introduction
Chapter 2 - Applications of power system analysis
Chapter 3 - Analytical procedures
Chapter 4 - System modeling
Chapter 5 - Computer solutions and systems
Chapter 6 - Load flow studies
Chapter 7 - Short-circuit studies
Chapter 8 - Stability studies
Chapter 9 - Motor-starting studies
Chapter 10 - Harmonic analysis studies
Chapter 11 - Switching transient studies
Chapter 12 - Reliability studies
Chapter 13 - Cable ampacity studies
Chapter 14 - Ground mat studies
Chapter 15 - Coordination studies
Chapter 16 - DC auxiliary power system analysis

You need to open or download above documents to study this course.

Course Summary

The purpose of the course is to provide recommended practices, methods, and a reference tool for the analysis of commercial and industrial power systems. It is necessary to obtain a copy and study the IEEE Recommended Practice for Industrial and Commercial Power System Analysis IEEE Std. 399-1997 as well as he lecture notes provided in the course material which provided additional guidance and recommendations by the author. The recommended practice, commonly known as the "Brown Book" is intended as a practical guide for power system analysis theory and its application in the computer aided analysis of electric power systems.

Related Links

For additional technical information related to this subject, please visit the following websites or web pages:

http://www.ansi.com/
http://www.ieee.com/
http://www.nfpa.com
http://www.nema.com

Quiz

Once you finish studying the above course content, you need to take a quiz to obtain the PDH credits.

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DISCLAIMER: The materials contained in the online course are not intended as a representation or warranty on the part of PDH Center or any other person/organization named herein. The materials are for general information only. They are not a substitute for competent professional advice. Application of this information to a specific project should be reviewed by a registered architect and/or professional engineer/surveyor. Anyone making use of the information set forth herein does so at their own risk and assumes any and all resulting liability arising therefrom.

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