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US 2020/0052552 A1Published application
Gas turbine engine system with electrical power extraction
AssigneeROLLS-ROYCE plc
InventorsStephen M. HUSBAND, Gian INCERPI
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AssigneeROLLS-ROYCE plc
InventorsStephen M. HUSBAND, Gian INCERPI
Estimating the term…
An engine system comprises first and second electrical generators coupled to lower and higher pressure (LP, HP) shafts respectively of a gas turbine engine. A controller is arranged to receive a signal corresponding to a total electrical power demand P1 and to output control signals to the electrical generators in response thereto such that the first and second electrical generators output electrical powers (1−y)P1 and yP1 respectively when P1≤Pm1, where 0.5<y≤1 and Pm1 is the maximum electrical output power of the first electrical generator. By satisfying the demand P1 mostly by extraction of electrical power from the first electrical generator when possible, the additional mechanical stress on the gas turbine engine resulting from electrical power extraction is reduced compared to the case where 50% or more of the demand P1 is satisfied by the second electrical generator.
A gas turbine engine system comprising a first sub-system having a first gas turbine engine and first and second electrical generators arranged to be driven by first and second spools respectively of the first gas turbine engine, the first spool having a lower rotational speed than the second spool during operation of the gas turbine engine, the engine system further comprising a controller arranged to provide first and second control signals to the first and second electrical generators respectively to control the electrical power extracted therefrom such that when the total electrical power P1 extracted from the first sub-system is less than or equal to Pm1 electrical powers yP1, (1−y)P1 are extracted from the first and second electrical generators respectively where 0.5<y≤1 and Pm1 is the maximum output power of the first electrical generator.
A method of controlling electrical power extraction from an engine system, the engine system comprising a gas turbine engine and first and second electrical generators arranged to be driven by first and second spools respectively of the gas turbine engine, the first spool having a lower rotational speed than the second spool during operation of the gas turbine engine, such that for an electrical power demand P1≤Pm1 on the engine system electrical powers yP1, (1−y)P1 are extracted from the first and second electrical generators respectively where Pm1 is the maximum electrical power output of the first electrical generator and 0.5<y≤1.
Dependencies are inferred from the claim text.