## EE2351 POWER SYSTEM ANALYSIS - E-Book free download for EEE - Sixth (6th) semester

Content :

UNIT I INTRODUCTION
Modern power system (or) electric energy system - Analysis for system planning and operational
studies – basic components of a power system. Generator models - transformer model –
transmission system model - load representation. Single line diagram – per phase and per unit
representation – change of base. Simple building algorithms for the formation of Y-Bus matrix and ZBus
matrix.

UNIT II POWER FLOW ANALYSIS
Importance of power flow analysis in planning and operation of power systems. Statement of power
flow problem - classification of buses into P-Q buses, P-V (voltage-controlled) buses and slack bus.
Development of Power flow model in complex variables form and polar variables form.
Iterative solution using Gauss-Seidel method including Q-limit check for voltage-controlled buses –
algorithm and flow chart.
Iterative solution using Newton-Raphson (N-R) method (polar form) including Q-limit check and bus
switching for voltage-controlled buses - Jacobian matrix elements – algorithm and flow chart.
Development of Fast Decoupled Power Flow (FDPF) model and iterative solution – algorithm and
flowchart;
Comparison of the three methods.

UNIT III FAULT ANALYSIS – BALANCED FAULTS
Importance short circuit (or) for fault analysis - basic assumptions in fault analysis of power systems.
Symmetrical (or) balanced three phase faults – problem formulation – fault analysis using Z-bus
matrix – algorithm and flow chart. Computations of short circuit capacity, post fault voltage and
currents.

UNIT IV FAULT ANALYSIS – UNBALANCED FAULTS
Introduction to symmetrical components – sequence impedances – sequence networks –
representation of single line to ground, line to line and double line to ground fault conditions.
Unbalanced fault analysis - problem formulation – analysis using Z-bus impedance matrix –
(algorithm and flow chart.).

UNIT V STABILITY ANALYSIS
Importance of stability analysis in power system planning and operation - classification of power
system stability - angle and voltage stability – simple treatment of angle stability into small-signal and
large-signal (transient) stability
Single Machine Infinite Bus (SMIB) system: Development of swing equation - equal area criterion -
determination of critical clearing angle and time by using modified Euler method and Runge-Kutta
second order method. Algorithm and flow chart.