⌁

GRID

Siemens Energy SGT-800 · 62 MW

Time
t+0:00.0START BLOCKED
MECHANICAL — SGT-800 + reduction gearbox → 4-pole generatorAVR70%GEARBOX4.40:1MGT MOTORAIRCOMPRESSORCOMBUSTORIGNTURBINE0 MW0 rpm25°CEXHAUSTBYPASS100%DIVERTERHRSGcoldHRSG STKsteamSST-400CONDENSEROPEN CYCLEELECTRICAL — single lineISLAND BUS · DEAD3~ 11kVALL SHEDGRID∞ bus · 50.0 HzAUX BUS · DEADGT UNIT AUXGBLACK-START PGT LUBEON DCDCDC SYSTEMSUPPLYINGPST LUBEON DCAUX TXMST BARRING
Free-running
Siemens Energy SGT-800Industrial gas turbine, 62 MW class, single-shaft, 75% H₂ capable.
Rated
62 MW
η
41.1%
Heat rate
8,759 kJ/kWh
PR
21.1:1
Exhaust
135.5 kg/s · 596°C
Speed
6,600 → 1,500 rpm
0.00HzFrequency
0.00kVTerminal Voltage
Real Power0MW
Reactive Power+0MVAr
absorbexport
Turbine0MW
Power Angle0°
Synchroscopeinactive
SLOWFASTIN PHASE↺↻
slip —no live bus

Field & power angle

δ 0°
jX·IV (0.00)E (1.06)

Offline: no load angle yet. E is the open-circuit field voltage, V the terminal. Synchronise and load the set to open up δ.

Frequency (Hz)

Frequency

Voltage (kV)

Voltage

Power balance (MW / MVAr)

Turbine MW
Output MW
Reactive MVAr

Frequency & Load

Grid frequency is just the spinning speed of the generator's rotor. At 50 Hz a 2-pole machine turns 3000 rpm.

Frequency only stays constant when mechanical power in (gas) exactly equals electrical power out (load). Any surplus accelerates the rotor and frequency rises; a deficit slows it and frequency falls.

Try it: open the breaker to go islanded, then nudge the Real Load up. Watch frequency sag until you add gas to rebalance.

2H · df/dt = P_mech − P_elec