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Computer Based Analysis Of Electrical Power System For The Purpose Of Stability Studies
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1.5 CONCEPT OF POWER SYSTEM STABILITY
1.5.1 Definition of Power System Stability
Power
system stability can be defined as the ability of the power system to
return to steady state without losing synchronism. Power is generated by
synchronous generators that operate in synchronism with the rest of the
system. A generator is synchronized with a bus when both of them have
same frequency, voltage and phase sequence.
1.6 Classification of Power System Stability
1.6.1 Steady State Stability
These
studies are restricted to small and gradual changes in the system
operation conditions. In this, we basically concentrate on restricting
the bus voltages close to their normal values. We also ensure that
phase angles between two buses are not too large and check for the
overloading of the power equipment, and transmission lines. These checks
are usually done using power flow studies (CIGRE Report, 2011).
1.6.2 Transient Stability
From
(IEEE, 2012), this involves the study of the power system following a
major disturbance. Following a large disturbance, the synchronous
alternator the machine power (load) angle changes due to sudden
acceleration of the rotor shaft. The objective of the transient
stability is to ascertain whether the load angle returns to a steady
state value following the clearance of the disturbance.
1.6.3 Dynamic Stability
This
is the ability of a power system to maintain stability under continuous
small disturbance. This small disturbance occurs due to random
fluctuations in loads and generation levels. In an interconnected power
system, these random variations can lead catastrophic failure as this
may force the rotor angle to increase steadily.
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ABSRACT - [ Total Page(s): 1 ]This report is on stability study in electrical power system. The ability of an electric power system to reestablish the initial state (or one practically identical) after any disturbance manifested as a deviation from the initial parameter values for the system’s operation. The electric power sources in a power system are usually synchronous generators, which are coupled together by a common electric network in such a way that the rotors of all generators are in synchronized rotation. Th ... Continue reading---
