US 11,746,712 B2
Controller and method
Vili Panov, Lincoln (GB)
Assigned to Siemens Energy Global GmbH & Co. KG, Munich (DE)
Appl. No. 16/968,584
Filed by Siemens Energy Global GmbH & Co. KG, Munich (DE)
PCT Filed Feb. 13, 2019, PCT No. PCT/EP2019/053576
§ 371(c)(1), (2) Date Aug. 8, 2020,
PCT Pub. No. WO2019/162168, PCT Pub. Date Aug. 29, 2019.
Claims priority of application No. 18158433 (EP), filed on Feb. 23, 2018.
Prior Publication US 2021/0071591 A1, Mar. 11, 2021
Int. Cl. F02C 9/48 (2006.01); F02C 9/16 (2006.01); F02C 9/50 (2006.01); F02C 7/22 (2006.01)
CPC F02C 9/48 (2013.01) [F02C 7/22 (2013.01); F02C 9/16 (2013.01); F02C 9/50 (2013.01); F05D 2240/35 (2013.01); F05D 2270/304 (2013.01); F05D 2270/3061 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method of controlling a gas turbine arranged to supply a load, the gas turbine comprising a compressor arranged to operate at a rotational speed, a combustor and a fuel supply comprising a first fuel supply and a second fuel supply, wherein the compressor is arranged to supply air to the combustor at a combustor air mass flow rate and wherein the fuel supply is arranged to supply fuel at a total fuel mass flow rate to the combustor, the method comprising:
detecting a load change to the load due to a transient of the gas turbine; and
controlling the compressor, in response to the load change and by way of a controller, to supply air to the combustor at a new combustor air mass flow rate;
wherein the new combustor air mass flow rate is within a range between a first threshold indicative of a lean blow out (LBO) limit and a second threshold indicative of a surge limit,
wherein the controller comprises memory storing a first plurality of relationships to determine a correction factor for the load change to the load, the memory further storing instructions to determine an allowable rate of change of the rotational speed for the load change to the load,
wherein the controlling by the controller of the compressor to supply air to the combustor at the new combustor air mass flow rate comprises the controller accessing the memory and processing the first plurality of relationships to determine the correction factor and processing the instructions to determine the allowable rate of change of the rotational speed,
wherein the controlling by the controller of the compressor to supply air to the combustor at the new combustor air mass flow rate is configured so that the new combustor air mass flow rate is based, at least in part, on the determined correction factor and the determined allowable rate of change of the rotational speed.
 
11. A controller to control a gas turbine arranged to supply a load, the gas turbine comprising a compressor arranged to operate at a rotational speed, a combustor and a fuel supply, wherein the compressor is arranged to supply air to the combustor at a combustor air mass flow rate and wherein the fuel supply is arranged to supply fuel a total fuel mass flow rate to the combustor, wherein the controller is configured to:
responsive to a load change to the load, control the compressor to supply air to the combustor at a new combustor air mass flow rate, wherein the new combustor air mass flow rate is within a range between a first threshold indicative of lean blow out (LBO) limit and a second threshold indicative of a surge limit, wherein the controller comprises memory having stored thereon a first plurality of relationships to determine a correction factor for the load change to the load, the memory further having stored thereon instructions to determine an allowable rate of change of the rotational speed for the load change to the load;
access the memory to process the first plurality of relationships to determine the correction factor and to process the instructions to determine the allowable rate of change of the rotational speed; and
determine the new combustor air mass flow rate based, at least in part, on the determined correction factor and the determined allowable rate of change of the rotational speed.