Transient Stability Analysis

TRANSIENT STABILTY ANALYSIS

Executive summary

In the past days, system stability was regarded as a problem for electric utility engineers but the future is moving toward deregulated power systems. This leads to the emergence of small independent power producers (IPPs) and co-generation (co-gen) companies where that produce power for industrial and commercial facilities by installing local generation units. Hence, stability study is the area of interest in power system studies from the perspective of both utility and IPP/co-gen companies.

Stability is the concern of the power system behavior when subjected to a transient disturbance whether the disturbance may be small or large. It is the property of a power system that enables it to remain in a state of operating equilibrium under normal operating conditions and to regain an acceptable state of equilibrium after being subjected to a disturbance.

Transient Stability involves the study of the power system following a major disturbance where the synchronous alternator’s power (load) angle changes due to sudden acceleration of the rotor shaft.

The objective of Transient Stability

• To compute critical clearing time/angle

• To study the behavior of system voltage, frequency & power flow under different transient conditions

• To determine the behavior of Exciter, Governor response under transient state

Outcome

After completing this study, a participant will have a knowledge

• Power angle relationship

• Power transfer equation

• Swing equation

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Transient Stability Analysis

• Significance of inertia

• Equal area criterion

• critical clearing time/angle

• Modes of the governor – Droop, Isochronous

REFERENCE

• IEEE Std 399-1997 IEEE Recommended Practice for Industrial and Commercial Power Systems Analysis

• Power System Stability and Control” by Prabha Kundur

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Transient Stability Analysis

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Transient Stability Analysis