A control system for a gas turbine, wherein a number of regulators generate respective control signals selectable to regulate fuel supply to a combustion chamber of the gas turbine. The regulators include at least one speed/load regulator, wherein a first and a second regulating block, separate from
A control system for a gas turbine, wherein a number of regulators generate respective control signals selectable to regulate fuel supply to a combustion chamber of the gas turbine. The regulators include at least one speed/load regulator, wherein a first and a second regulating block, separate from each other, generate respective control signals which are selectable to perform speed control of the turbine and load control of the turbine.
대표청구항▼
What is claimed is: 1. A control system for a gas turbine (2), wherein a number of regulators (24) generate respective control signals (P 1-P6) selectable (25) to regulate (27) fuel supply to a combustion chamber (5) of said gas turbine; said regulators comprising at least one speed/load regulator
What is claimed is: 1. A control system for a gas turbine (2), wherein a number of regulators (24) generate respective control signals (P 1-P6) selectable (25) to regulate (27) fuel supply to a combustion chamber (5) of said gas turbine; said regulators comprising at least one speed/load regulator receiving at least one first feedback signal (NT1-NT6, NT) related to the speed of said gas turbine (2), and at least one second feedback signal (PEL1, PEL2, PEL) related to the power supplied by said gas turbine; characterized in that said speed/load regulator comprises a first regulating block (60), in particular a proportional-integral regulator, receiving a first error signal (ΔN) related to the difference between said first feedback signal (NT1-NT6, NT) and a reference speed value (Vref); said speed/load regulator also comprising a second regulating block (64), in particular a proportional-integral regulator, separate from the first regulating block (60) and receiving a second error signal (ΔP) related to the difference between said second feedback signal (PEL1, PEL2, PEL) and a reference load value; said speed/load regulator also comprising selecting means ( 62) for selecting the output of said first regulating block (60 ) during a control step of the speed of said gas turbine, and for selecting said second regulating block (64) during a control step of the load of said gas turbine. 2. A system as claimed in claim 1, wherein regulating means (66) are provided for modifying at least one gain parameter of said second regulating block (64) as a function of said first error signal (ΔN) related to the difference between said first feedback signal (NT1-NT6, NT) and a reference speed value (Vref). 3. A system as claimed in claim 1, wherein regulating means are provided for supplying said second regulating block (64) with a signal related to the difference between the second error signal (ΔP) and said first error signal (ΔN). 4. A system as claimed in claim 1, wherein advancing means (67) are provided for supplying a signal, related to said first error signal (ΔN), to the output of said second regulating block (64). 5. A system as claimed in claim 1, wherein speed acquisition means (52) are provided, which receive signals generated by respective rotation sensors (54) fitted to said gas turbine; said speed acquisition means (52) performing the following operations: each input signal is compared with another input signal, and the lower-value signal is selected; the highest-value signal is extracted from the selected signals; and the extracted signal represents the output of said speed acquisition means (52), and represents the first feedback signal. 6. A system as claimed in claim 1, wherein electric power acquisition means (44) are provided, which receive signals generated by respective electric power sensors (45, 46) fitted to a generator (20) driven by said gas turbine (2); said electric power acquisition means (44) selecting the highest-value input signal to generate said second feedback signal. 7. A system as claimed in claim 1, wherein a compression ratio regulator (38) is provided, which receives a third feedback signal related to the ratio between the output pressure (Pu) of the compressor of said gas turbine and the input pressure (Pi) of the compressor of said gas turbine; said compression ratio regulator ( 38) comprising a third regulating block (106), in particular a proportional-integral regulator, which receives a third error signal (βerror) related to the difference between said third feedback signal (β) and a reference compression ratio value; said third regulating block generating a control signal. 8. A system as claimed in claim 7, wherein adding means ( 108) are provided for supplying a signal, related to the time derivative of said third feedback signal, to the output signal of said third regulating block. 9. A system as claimed in claim 8, wherein a turbine cooling air regulator (40) is provided, which receives said third feedback signal; said turbine cooling air regulator (40) comprising comparing means (115, 110) for comparing said third feedback signal with a maximum value to generate a fourth error signal; said turbine cooling air regulator (40) also comprising: a fourth regulating block (130), in particular a proportional-integral regulator, which receives said fourth error signal and generates a control signal; and a function block (120), which receives said fourth error signal and generates a command to position airflow regulators ( 9) fitted to the compressor of said gas turbine (2). 10. A system as claimed in claim 1, wherein a temperature regulator (36) is provided, which receives a fifth feedback signal related to an output temperature of said gas turbine; said temperature regulator (36) comprising a fifth regulating block (90), in particular a proportional-integral regulator, which receives a fifth error signal related to the difference between said fifth feedback signal and a reference temperature (Tref); said fifth regulating block generating a control signal. 11. A system as claimed in claim 1, wherein a selecting device (25) is provided, which receives the output signals generated by the individual regulators, and supplies the lowest-value input signal to generate a control signal (C(t)) controlling fuel supply to said gas turbine.
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이 특허에 인용된 특허 (4)
Ullyott Richard Raymond Wilson,CAX, Auxiliary power unit system and method of operating an auxiliary power unit.
McCarty William L. (West Chester FL) Wescott Kermit R. (Winter Springs FL), Gas turbine control system having maximum instantaneous load-pickup limiter.
Lucenko Michael (Glastonbury CT) Vanderleest Ruurd E. (Vernon CT) St. Onge Kenneth J. (West Hartford CT), Method and apparatus for detecting burner blowout.
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