EE2026 POWER SYSTEM DYNAMICS SYLLABUS

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AIM

To understand the concept of modelling the power system and the components for

simulating the transient and dynamic behaviour of power system meant for the stability

studies.

OBJECTIVES

 To review the modeling of synchronous machine, the excitation system and speedgoverning

controllers.

 To study small signal stability analysis of a single-machine infinite bus system with

excitation system and power system stabilizer.

 To study transient stability simulation of multimachine power system.

UNIT I INTRODUCTION

Basics of system dynamics – numerical techniques – introduction to software packages

to study the responses. Concept and importance of power system stability in the

operation and design distinctionbetween transient and dynamic stability - complexity of

stability problem in large system – necessity for reduced models - stability of

interconnected systems.

UNIT II SYNCHRONOUS MACHINE MODELLING

Synchronous machine - flux linkage equations - Park’s transformation - per unit

conversion - normalizing the equations - equivalent circuit - current space model - flux

linkage state space model. Sub-transient and transient inductances - time constants.

Simplified models (one axis and constant flux linkage) - steady state equations and

phasor diagrams.

UNIT III MACHINE CONTROLLERS

Exciter and voltage regulators - function and types of excitation systems - typical

excitation system configuration - block diagram and state space representation of IEEE

type 1 excitation system - saturation function - stabilizing circuit.

Function of speed governing systems - block diagram and state space representation of

IEEE mechanical hydraulic governor and electrical hydraulic governors for hydro

turbines and steam turbines.

UNIT IV TRANSIENT STABILITY

State equation for multimachine system with one axis model and simulation – modelling

of multimachine power system with one axis machine model including excitation system

and speed governing system and simulation using R-K method of fourth order (Gill’s

technique) for transient stability analysis - power system stabilizer. For all simulations,

the algorithm and flow chart have to be discussed.

UNIT V DYNAMIC STABILITY

System response to small disturbances - linear model of the unregulated synchronous

machine and its modes of oscillation - regulated synchronous machine - distribution of

power impact - linearization of the load equation for the one machine problem –

simplified linear model - effect of excitation on dynamic stability - approximate system

representation - supplementary stabilizing signals - dynamic performance measure -

small signal performance measures.

TEXT BOOKS

1. P.M. Anderson and A.A.Fouad, ‘Power System Control and Stability’, Galgotia

Publications, New Delhi, 2003.

2. P. Kundur, ‘Power System Stability and Control’, McGraw Hill Inc., USA, 1994.

REFERENCES

1. M.A.Pai and W.Sauer, ‘Power System Dynamics and Stability’, Pearson Education

Asia, India, 2002.

2. James A.Momoh, Mohamed.E. EI-Hawary.“ Electric Systems, Dynamics and stability

with Artificial Intelligence applications”, Marcel Dekker, USA First Edition 2000.