|
The electrical system model includes the major loads on the
4160V busses; specifically, the motors for circulating water
pumps, FD fans, Fuel Oil Burner pumps, condensate pumps, and
gas recirculation fan.
Some 480V bus equipment is also modeled such as: L.P. heater drain pumps, Cooling water pumps,
Condenser vaccum pumps, and Aux oil pumps. 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 be
monitored to understand the generator dynamics as the load and
excitation are changed.
|