GovCT2

General governor with frequency-dependent fuel flow limit. This model is a modification of the GovCT1 model in order to represent the frequency-dependent fuel flow limit of a specific gas turbine manufacturer.

Inheritance

Attributes

Label	Type	Multiplicity	Comment
aset	Float	1..1	Acceleration limiter setpoint (Aset). Unit = PU / s. Typical value = 10.
db	Float	1..1	Speed governor deadband in PU speed (db). In the majority of applications, it is recommended that this value be set to zero. Typical value = 0.
dm	Float	1..1	Speed sensitivity coefficient (Dm). Dm can represent either the variation of the engine power with the shaft speed or the variation of maximum power capability with shaft speed. If it is positive it describes the falling slope of the engine speed verses power characteristic as speed increases. A slightly falling characteristic is typical for reciprocating engines and some aero-derivative turbines. If it is negative the engine power is assumed to be unaffected by the shaft speed, but the maximum permissible fuel flow is taken to fall with falling shaft speed. This is characteristic of single-shaft industrial turbines due to exhaust temperature limits. Typical value = 0.
flim1	Float	1..1	Frequency threshold 1 (Flim1). Unit = Hz. Typical value = 59.
flim10	Float	1..1	Frequency threshold 10 (Flim10). Unit = Hz. Typical value = 0.
flim2	Float	1..1	Frequency threshold 2 (Flim2). Unit = Hz. Typical value = 0.
flim3	Float	1..1	Frequency threshold 3 (Flim3). Unit = Hz. Typical value = 0.
flim4	Float	1..1	Frequency threshold 4 (Flim4). Unit = Hz. Typical value = 0.
flim5	Float	1..1	Frequency threshold 5 (Flim5). Unit = Hz. Typical value = 0.
flim6	Float	1..1	Frequency threshold 6 (Flim6). Unit = Hz. Typical value = 0.
flim7	Float	1..1	Frequency threshold 7 (Flim7). Unit = Hz. Typical value = 0.
flim8	Float	1..1	Frequency threshold 8 (Flim8). Unit = Hz. Typical value = 0.
flim9	Float	1..1	Frequency threshold 9 (Flim9). Unit = Hz. Typical value = 0.
ka	Float	1..1	Acceleration limiter gain (Ka). Typical value = 10.
kdgov	Float	1..1	Governor derivative gain (Kdgov). Typical value = 0.
kigov	Float	1..1	Governor integral gain (Kigov). Typical value = 0,45.
kiload	Float	1..1	Load limiter integral gain for PI controller (Kiload). Typical value = 1.
kimw	Float	1..1	Power controller (reset) gain (Kimw). The default value of 0,01 corresponds to a reset time of 100 seconds. A value of 0,001 corresponds to a relatively slow-acting load controller. Typical value = 0.
kpgov	Float	1..1	Governor proportional gain (Kpgov). Typical value = 4.
kpload	Float	1..1	Load limiter proportional gain for PI controller (Kpload). Typical value = 1.
kturb	Float	1..1	Turbine gain (Kturb). Typical value = 1,9168.
ldref	Float	1..1	Load limiter reference value (Ldref). Typical value = 1.
maxerr	Float	1..1	Maximum value for speed error signal (Maxerr) (> GovCT2.minerr). Typical value = 1.
minerr	Float	1..1	Minimum value for speed error signal (Minerr) (< GovCT2.maxerr). Typical value = -1.
mwbase	Float	1..1	Base for power values (MWbase) (> 0). Unit = MW.
plim1	Float	1..1	Power limit 1 (Plim1). Typical value = 0,8325.
plim10	Float	1..1	Power limit 10 (Plim10). Typical value = 0.
plim2	Float	1..1	Power limit 2 (Plim2). Typical value = 0.
plim3	Float	1..1	Power limit 3 (Plim3). Typical value = 0.
plim4	Float	1..1	Power limit 4 (Plim4). Typical value = 0.
plim5	Float	1..1	Power limit 5 (Plim5). Typical value = 0.
plim6	Float	1..1	Power limit 6 (Plim6). Typical value = 0.
plim7	Float	1..1	Power limit 7 (Plim7). Typical value = 0.
plim8	Float	1..1	Power limit 8 (Plim8). Typical value = 0.
plim9	Float	1..1	Power Limit 9 (Plim9). Typical value = 0.
prate	Float	1..1	Ramp rate for frequency-dependent power limit (Prate). Typical value = 0,017.
r	Float	1..1	Permanent droop (R). Typical value = 0,05.
rclose	Float	1..1	Minimum valve closing rate (Rclose). Unit = PU / s. Typical value = -99.
rdown	Float	1..1	Maximum rate of load limit decrease (Rdown). Typical value = -99.
ropen	Float	1..1	Maximum valve opening rate (Ropen). Unit = PU / s. Typical value = 99.
rselect	DroopSignalFeedbackKind	1..1	Feedback signal for droop (Rselect). Typical value = electricalPower.
rup	Float	1..1	Maximum rate of load limit increase (Rup). Typical value = 99.
ta	Float	1..1	Acceleration limiter time constant (Ta) (>= 0). Typical value = 1.
tact	Float	1..1	Actuator time constant (Tact) (>= 0). Typical value = 0,4.
tb	Float	1..1	Turbine lag time constant (Tb) (>= 0). Typical value = 0,1.
tc	Float	1..1	Turbine lead time constant (Tc) (>= 0). Typical value = 0.
tdgov	Float	1..1	Governor derivative controller time constant (Tdgov) (>= 0). Typical value = 1.
teng	Float	1..1	Transport time delay for diesel engine used in representing diesel engines where there is a small but measurable transport delay between a change in fuel flow setting and the development of torque (Teng) (>= 0). Teng should be zero in all but special cases where this transport delay is of particular concern. Typical value = 0.
tfload	Float	1..1	Load limiter time constant (Tfload) (>= 0). Typical value = 3.
tpelec	Float	1..1	Electrical power transducer time constant (Tpelec) (>= 0). Typical value = 2,5.
tsa	Float	1..1	Temperature detection lead time constant (Tsa) (>= 0). Typical value = 0.
tsb	Float	1..1	Temperature detection lag time constant (Tsb) (>= 0). Typical value = 50.
vmax	Float	1..1	Maximum valve position limit (Vmax) (> GovCT2.vmin). Typical value = 1.
vmin	Float	1..1	Minimum valve position limit (Vmin) (< GovCT2.vmax). Typical value = 0,175.
wfnl	Float	1..1	No load fuel flow (Wfnl). Typical value = 0,187.
wfspd	Boolean	1..1	Switch for fuel source characteristic to recognize that fuel flow, for a given fuel valve stroke, can be proportional to engine speed (Wfspd). true = fuel flow proportional to speed (for some gas turbines and diesel engines with positive displacement fuel injectors) false = fuel control system keeps fuel flow independent of engine speed. Typical value = false.