SUBJECT CODE : EE6501SUBJECT NAME : Power System AnalysisSTAFF NAME : Dr.P.Usha Rani

UNIT I INTRODUCTION Need for system planning and operational studies – basic components of apower system.-Introduction to restructuring - Single line diagram – per phaseand per unit analysis – Generator - transformer – transmission line and loadrepresentation for different power system studies.- Primitive network -construction of Y-bus using inspection and singular transformation methods –z-bus.

Modern Power System

Modern power system is acomplex interconnected network. A typicalpower system consists of a 3 phase grid towhich all generating stations feeds energyand from which all substations tapsenergy.

A power system can be subdivided into four major parts:

- Generation- Transmission- Distribution- load

The basic components of the power system is shown in Fig

NEED FOR SYSTEM ANALYSIS IN PLANNING AND OPERATION OF POWER SYSTEM

Power system planning and operational analysis covers the maintenance of generation,transmission and distribution facilities

Steps:-Planning of power system- Implementation of the plans- Monitoring system- Compare plans with the results-If no undesirable deviation occurs, then directly go to planning of system- If undesirable deviation occurs then take corrective action and then go to planning of the system

Modeling of power system components

Formation of Y BUS

Graph:

I = e - b = e - m + l

A set of unconnected elements is defined as Primitive network

Z bus Building Algorithm

April 2018