K

Governor gain (recirpocal of droop)

pu

T1

Governor lag time constant

s

T2

Governor lead time constant

s

T3 (>0)

Valve positioner time constant

s

Uc (<0)

Maximum valve closing velocity

pu/s

Uo

Maximum valve opening velocity

pu/s

Pmax

Maximum valve opening

pu of mwcap

Pmin

Minimum valve opening

pu of mwcap

T4

High pressure turbine bowl time constant

s

K1

Fraction of hp shaft power after first boiler pass

-

K2

Fraction of lp shaft power after first boiler pass

-

T5

Reheater time constant

s

K3

Fraction of hp shaft power after second boiler pass

-

K4

Fraction of lp shaft power after second boiler pass

-

T6

Crossover time constant

s

K5

Fraction of hp shaft power after third boiler pass

-

K6

Fraction of lp shaft power after third boiler pass

-

T7

Double reheat time constant

s

K7

Fraction of hp shaft power after fourth boiler pass

-

K8

Fraction of lp shaft power after fourth boiler pass

-

Ts

Sampling time

s

Pm0_hp

Initial mechanical power output of the machine connected to the HP pressure shaft power

pu

Pm0_lp

Initial mechanical power output of the machine connected to the LP pressure shaft power

pu

w

Machine actual speed

pu

VAR

Variation of the external power reference.  (The reference value is internally assigned and corresponds to the mechanical power Initial condition obtained from the Load flow).

pu

Pmech_HP

High pressure shaft power

pu

Pmech_LP

Low Pressure  shaft power

pu