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The electrical system model includes the major loads on the 4160V busses;
specifically, the motors for circulating water pumps, FD fans, ID Fans, Pulverizers,
and Condensate pumps.
Some 480V bus equipment is also modeled (Air Preheaters and Turbine Turning Gear).
Remaining 480V Hard Panel loads are modeled with loads representing the electrical
characteristics of the equipment.
A breaker accomplishes generator synchronizing. All modes of synchronizing,
i.e., manual, digital synchronizer and load control, and computer, are
included. The excitation system model includes manual and automatic control of
field current. Reverse power trip logic is also modeled. The electrical system
is interfaced with the emulated operator interfaces for the DCS HMI and hard
panel.
During electrical system simulation, expected changes in voltage, current,
active and reactive power throughout the system can be seen when breakers are
closed or opened, motor loads are changed, generator is synchronized, and
excitation and turbine power are controlled. Generator load angle (i.e., the
phase angle of the generator induced emf relative to the generator terminal
voltage- not available in plant instrumentation) is also calculated by the
model. This can e monitored to understand the generator dynamics as the load
and excitation are changed.
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