US 11,781,492 B2
Two-shaft gas turbine control system and method
Bruno Giunta, Massa (IT); and Marco Palladino, Calenzano (IT)
Assigned to Nuovo Pignone Tecnologie S.R.L., Florence (IT)
Appl. No. 17/251,098
Filed by Nuovo Pignone Tecnologie S.R.L., Florence (IT)
PCT Filed Aug. 27, 2019, PCT No. PCT/IT2019/000067
§ 371(c)(1), (2) Date Dec. 10, 2020,
PCT Pub. No. WO2021/038604, PCT Pub. Date Mar. 4, 2021.
Prior Publication US 2022/0195947 A1, Jun. 23, 2022
Int. Cl. F02C 9/22 (2006.01); F02C 9/54 (2006.01); F02C 3/10 (2006.01)
CPC F02C 9/22 (2013.01) [F02C 3/10 (2013.01); F02C 9/54 (2013.01); F05D 2260/96 (2013.01); F05D 2270/024 (2013.01); F05D 2270/07 (2013.01); F05D 2270/304 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A gas turbine control system, comprising:
a first rotational speed sensing system configured to sense a first rotational speed of a high-pressure turbine wheel supported for rotation on a first shaft of a gas turbine;
a first error calculator configured to determine a first rotational speed error based on a first input signal from the first rotational speed sensing system and a first speed reference;
a second rotational speed sensing system configured to sense a second rotational speed of a low-pressure turbine wheel supported for rotation on a second shaft of the gas turbine;
a second error calculator configured to determine a second rotational speed error based on a second input signal from the second rotational speed sensing system and a second speed reference;
a nozzle-guide-vane (NGV) controller configured to provide a provisional NGV control signal to an NGV actuator configured to adjust an angular position of one or more NGVVs arranged between the high-pressure turbine wheel and the low-pressure turbine wheel, said provisional NGV control signal being a function of the first rotational speed error;
a fuel controller configured to provide a provisional fuel control signal to a fuel actuator configured to control a fuel flow rate delivered to a combustor of the gas turbine, wherein the provisional fuel control signal is a function of the second rotational speed error;
a first cross channel controller coupled respectively to the NGV controller and to the fuel controller, and configured to provide a fuel control modification signal to the fuel actuator based on the provisional NGV control signal;
a second cross channel controller coupled respectively to the fuel controller and to the NGV controller, and configured to provide an NGV control modification signal to the NGV actuator based on the provisional fuel control signal;
the fuel actuator configured adjust the fuel flow rate delivered to the combustor of the gas turbine based on a sum of the provisional fuel control signal and the fuel control modification signal; and
the NGV actuator configured to adjust the angular position of the one or more NGVs based on a sum of the provisional NGV control signal and the NGV control modification signal.