JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Systems and Electrical Machines

Course Objectives

to prepare students to:

• Develop mathematical models for synchronous machine, Exciter, Governor and Prime mover.
• Study power system dynamic phenomena and the effects of exciter and governor control.
• Understand methods to improve dynamic stability.

Course Outcomes

Students will be able to:

• Understand the modeling of synchronous machine in details
• Understand the modeling of Exciter and Governor control
• Carry out simulation studies of power system dynamics using MATLAB-SIMULINK, MI-POWER
• Carry out stability analysis with and without power system stabilizer (PSS)

UNIT - I: POWER SYSTEM STABILITY: A CLASSICAL APPROACH

Introduction, Requirements of a Reliable Electrical Power Service, Swing Equation, Power-Angle Curve, Stability analysis of SMIB system, Equal area criteria, Classical Model of a Multimachine System, Shortcomings of the Classical Model, Block Diagram of One Machine infinite bus system, System Response to Small Disturbances: Types of Problems Studied, The Unregulated Synchronous Machine, Modes of Oscillation of an Unregulated Multimachine System, Regulated Synchronous Machine.

UNIT - II: SYNCHRONOUS MACHINE MODELING-I

Introduction, Park's Transformation, Flux Linkage Equations, Voltage Equations, Formulation of State- Space Equations, Current Formulation, Per Unit Conversion, Normalizing the Voltage and Torque Equations, Equivalent Circuit of a Synchronous Machine, The Flux Linkage State-Space Model, Load Equations, Sub-transient and Transient Inductances and Time Constants, Simplified Models of the Synchronous Machine, Turbine Generator Dynamic Models.

UNIT - III: SYNCHRONOUS MACHINE MODELING-II

Steady state equations and phasor diagrams, Determining steady state conditions, Evaluation of Initial conditions, Determination of machine parameters, Digital simulation of Synchronous machines, Linearization and Simplified Linear model and state-space representation of simplified model.

UNIT - IV: EXCITATION AND PRIME MOVER CONTROL

Simplified view of excitation control, control configurations, typical excitation configurations, excitation control system definitions, voltage regulator, exciter buildup, excitation system response, state-space description of the excitation system, computer representation of excitation systems, Typical system constants, and the effects of excitation on generator power limits, transient stability and dynamic stability of the power system, Prime mover control: Hydraulic turbines and governing systems, Steam turbines and governing systems.

UNIT - V: SMALL SIGNAL STABILITY ANALYSIS

Fundamental concepts of stability of dynamic systems, Eigenproperties of the state matrix, Small-signal stability of a single-machine infinite bus system, Effects of excitation system, Power system stabilizer, System state matrix with amortisseurs, Characteristics of small-signal stability problems.

R19 M. TECH. EPE/EPS

TEXT BOOKS:

• 1. P. M. Anderson & A. A. Fouad “Power System Control and Stability”, Galgotia , New Delhi, 1981
• 2. J Machowski, J Bialek & J. R W. Bumby, “Power System Dynamics and Stability”, John Wiley & Sons, 1997

REFERENCES:

• 1. P.Kundur, “Power System Stability and Control”, McGraw Hill Inc., 1994.
• 2. E.W. Kimbark, “Power system stability”, Vol. I & III, John Wiley & Sons, New York 2002
• 3. L. Leonard Grigsby (Ed.); “Power System Stability and Control”, 2nd edition, CRC Press, 2007
• 4. NPTEL online course, Prof. A. M. Kulkarni, Power System Dynamics and Control, https://www.youtube.com/playlist?list=PLuv3GM6-gsE2WXbxLSnqKHf5gcnedXCZH R19 M. TECH. EPE/EPS M. TECH. I Year II Sem. (EPE/EPS)