EE2026 POWER SYSTEM DYNAMICS
AIM
To understand the concept of modelling the power system and the components forsimulating the transient and dynamic behaviour of power system meant for the stability studies.
OBJECTIVES
i. To review the modeling of synchronous machine, the excitation system and speedgoverningcontrollers.
ii. To study small signal stability analysis of a single-machine infinite bus system with excitation system and power system stabilizer.
iii. To study transient stability simulation of multimachine power system.
1. 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 - distinction between transient and dynamic stability - complexity of stability problem in large system – necessity for reduced models - stability of interconnected systems.
2. 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.
3. 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.
4. TRANSIENT STABILITY
State equation for multimachine system with one axis model and simulation –
modelling of multimachine power system with one axis machine model includingexcitation system and speed governing system and simulation using R-K method of fourth order (Gill’s technique) for transient stability analysis - power systemstabilizer. For all simulations, the algorithm and flow chart have to be discussed.
5. DYNAMIC STABILITY 9
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 theone 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’, GalgotiaPublications, 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 andstability with Artificial Intelligence applications”, Marcel Dekker, USA First
Edition 2000.