Analysis For System Planning and Operational Studies

ANALYSIS FOR SYSTEM PLANNING AND OPERATIONAL STUDIES

Needs for system analysis in planning and operation of power system

Ø  Planning and operation of power system - Operational planning covers the whole period ranging from the incremental stage of system development

Ø The system operation engineers at various points like area, space, regional & national load dispatch of power

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

Steps:

Ø          Planning of power system

Ø          Implementation of the plans

Ø          Monitoring system

Ø          Compare plans with the results

Ø          If no undesirable deviation occurs, then directly go to planning of system

Ø      If undesirable deviation occurs then take corrective action and then go to planning Of the system

Planning and operation of power system

Planning and operation of power system the following analysis are very important

(a). Load flow analysis

(b). Short circuit analysis

(c). Transient analysis

Load flow analysis

Ø  Electrical power system operate - Steady state mode

Ø  Basic calculation required to determine the characteristics of this state is called as Load flow

Ø  Power flow studies - To determine the voltage current active and reactive power flows in given power system

Ø  A number of operating condition can be analyzed including contingencies. That operating conditions are

(a). Loss of generator

(b).Loss of a transmission line

(c).Loss of transformer (or) Load

(d). Equipment over load (or) unacceptable voltage levels

Ø  The result of the power flow analysis are stating point for the stability analysis and power factor improvement

Ø  Load flow study is done during the planning of a new system or the extension of an existing one

Short circuit studies

Ø  To determine the magnitude of the current flowing through out the power system at various time intervals after fault

Ø  The objective of short circuit analysis - To determine the current and voltages at different location of the system corresponding to different types of faults

(a). Three phase to ground fault

(b). Line to ground fault

(c). Line to line fault

(d). Double line to ground fault

(e). Open conductor fault

Transient stability analysis

Ø  The ability of the power system consisting of two (or) more generators to continue to operate after change occur on the system is a measure of the stability

Ø  In power system the stability depends on the power flow pattern generator characteristics system loading level and the line parameters