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The electrical system model includes the major loads on the 6.9kV busses;
specifically, the motors for circulating water pumps, pulverizers, FD and ID
fans, auxiliary cooling water pumps, condensate pumps, LP heater drain pump,
primary air fans, gas recirculation fan, and standby boiler feed pumps. 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 be monitored to understand the generator dynamics as the load
and excitation are changed.
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