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The ability
to transfer energy across AC networks is hampered by thermal, voltage and
stability limits. The maximum loadability of a transmission system is the
state where voltages collapse and units may get out of synchronism, and is
a severe constraint. The distance from a given operating point to the state of maximum
loadability is called steady-state stability reserve, changes when the
load, topology and voltages change, and may be quite different from values
computed off-line. Its recalculation after each state estimate and
load-flow solution is required because operating the system near its
stability limit may lead to blackouts.
This problem is solved rapidly by
Siemens' QuickStab®, a field-proven software used:
Given a load-flow
solution or state estimate of a multi-area power system, QuickStab®:
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Uses a fast voltage stability technique to compute, for
each area, the maximum loadability and the safe system loading for a
user-defined security margin
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Identifies generators
that may cause instability and ranks the machines and tie-line
injections in order of their impact on system’s stability
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Performs bus-level analysis, shows how the
generators are “seen” from that bus, and ranks the buses in the order of
their stability indices.
QuickStab® can be used as a stand-alone off-line application,
invoked from, or used in conjunction with, third-party load-flow programs,
and seamlessly or loosely integrated with real-time SCADA/EMS network
analysis applications. The program has been implemented in operations
planning, real-time dispatching, market operations, and transmission
planning in US, Europe, Latin America and Asia.
QuickStab®
stands out in the industry because it quantifies the risk of blackout, can
help develop preventative and corrective strategies, is extremely fast,
makes extensive use of intuitive graphics, and can be easily integrated
with third-party software. These unique features and benefits are
summarized below:
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Features |
Benefits |
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Quantifies the risk of blackout by performing system-wide voltage
and steady-state stability
analysis
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Makes it possible to:
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Performs bus-level voltage and
steady-state stability assessment |
Helps identify critical
buses. Visualizes the impact of generators and interconnections upon
any bus |
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Determines the impact of
generators and tie-lines on the maximum loadability of the power
system |
Allows developing
preventative and or corrective strategies |
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Contingency processing -- full
range of system-wide voltage and steady-state stability calculations
for user-specified line and generation contingencies |
Helps perform
what-if stability checks to detect contingency cases that may
reduce the system stability reserve to unacceptable levels |
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High computational
speed |
Supports quick decision
making in real-time and when many rapid simulations are needed
off-line |
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Extensive use of
intuitive charts and graphics |
The software is simple
to use and the results are easy to interpret and understand |
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Modular design of the
computational and graphic engines |
Can enhance existing
load-flow and state estimation tools with fast voltage stability
checks |
To request additional
information or to make arrangements for a presentation, please send your
inquiry via e-mail at
QuickStab.Energy@siemens.com or in writing to Energy Automation Solutions, Siemens AG Energy Sector ED EA
SOL GS, Humboldtstr. 59, 90459 Nuremberg, Germany.
Download File
Download the
Spanish version
Download complete
functional description of QuickStab
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