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Understanding Voltage Stability(1)

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Hwachang Song

on 28 March 2015

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Transcript of Understanding Voltage Stability(1)

Understanding Voltage Stability(1)
AC Transmission
Transmission Aspect
Voltage Stability
Hwachang Song
Load Aspect

Power System Stability
Recent power systems are experiencing "voltage collapse."
With the conventional stability analysis, it is difficult to explain the phenomena.
Many systems, world-wide, experienced "wide-area blackouts," because of protection operations resulting from unacceptable low voltage.
Voltage instability occurs before angular instability (critical frequency change) comes.
Voltage instability is closely related to Q balance.
Voltage Instability
Voltage Instability
Voltage Instability
Short-term voltage instability
Long-term voltage instability
Long-term voltage instability
Under Load Tap Changing Transformers
ULTC setting (Europe, US)
Load Recovery
Full transcript