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Patent Agency Ranking
公开(公告)号：US20220190606A1
公开(公告)日：2022-06-16
申请号：US17532436
申请日：2021-11-22
Applicant: Rolls-Royce plc
Inventor： Pabbathi Venkatesh , Xiong Liu , Stephen J. Mountain
Abstract: Electrical power systems and methods of controlling electrical power systems are described. One such electrical power system comprises: a first ac bus and a first generator set configured to supply the first ac bus with ac electrical power; a second ac bus and a second generator set, configured to supply the second ac bus with ac electrical power; an interconnecting transformer connected between the first and second ac busses; a primary electrical load connected to both the first and second ac busses via a converter arrangement; an auxiliary load connected to the first ac bus; and a controller configured to control the first generator set according to a first droop control profile and to control the second generator set according to a second droop control profile, the first and second droop control profiles relating respective generator operating frequencies of the first and second generator sets to respective output powers of the first and second generator sets.
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公开(公告)号：US11381190B2
公开(公告)日：2022-07-05
申请号：US17140538
申请日：2021-01-04
Applicant: ROLLS-ROYCE plc
Inventor： Jishnu K Kambrath , Xiong Liu , Youyi Wang , Aaron A Ayu
Abstract: A torsional mode damping controller in which the controller modifies electrical power to an electrical motor to provide active damping control of torsional vibration in rotating masses. The controller receives a measurement of a rotational speed of the rotating masses ωm and an estimate or a measurement of a torque transmitted between the rotating masses Tsh; based on the received transmitted torque Tsh, generate a compensating torque to suppress vibration Tcom; based on the received rotational speed ωm and the compensating torque Tcom, generate an electromagnetic torque modification signal Tmodi; and modify the electrical power provided to the electrical motor on the basis of the electromagnetic torque modification signal Tmodi. The controller is further configured to generate compensating torque Tcom by applying a filter to the received transmitted torque Tsh, based on plural tunable parameters including a tuning gain K, a cut-off frequency ωn and a resonant damping ratio ζ.
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公开(公告)号：US10038367B2
公开(公告)日：2018-07-31
申请号：US15601050
申请日：2017-05-22
Applicant: ROLLS-ROYCE plc
Inventor： Xiong Liu , Michael A. Zagrodnik , Amit K. Gupta
CPC classification number: H02M1/4233 , H02M1/4216 , H02M5/4585 , H02M7/49 , H02M7/66 , H02M7/84 , H02M2001/4283 , H02P7/04 , Y02B70/126
Abstract: An electrical system including a three phase AC input supply and three or more H-bridge converter cells. Each H-bridge converter cell has: an active front end rectifier for receiving the three phase AC input supply and transforming it into a DC supply, thereby providing a rectifier current ii; a capacitor suitable to receive a capacitor current iC, the capacitor smoothing the DC supply; and an inverter suitable to receive an inverter current io, wherein io=ii−iC, said inverter transforming the received inverter current io into a single phase AC supply. The system also including a control subsystem, which provides a signal to each active front end rectifier to vary its respective rectifier current ii such that the difference between the rectifier current ii, provided by the active front end rectifier, and the inverter current io, received by the inverter, is substantially zero.
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公开(公告)号：US11807119B2
公开(公告)日：2023-11-07
申请号：US17451963
申请日：2021-10-22
Applicant: Rolls Royce plc
Inventor： Xiong Liu , Michael A Zagrodnik , Amit K Gupta
Abstract: Electrical power systems having variable-voltage DC busses and methods of controlling voltage settings of such busses. One electrical power system comprises: a variable-voltage DC bus; a number N≥2 of electrical machines, each electrical machine connected to the variable-voltage DC bus via one of a corresponding number N of converters, each electrical machine and corresponding converter having an index n=(1, . . . , N); and a controller configured to select a voltage setting Vdc_bus for the variable-voltage DC bus and to provide control signals to the converters to control the voltage setting of the variable-voltage DC bus according to the selected voltage setting Vdc_bus. The controller configured to select a voltage setting Vdc_bus greater than or equal to a minimum voltage requirement Vdc_min for the bus. The controller is configured to determine the minimum voltage requirement Vdc_min using present operating speeds of each of the N electrical machines.
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公开(公告)号：US11594891B2
公开(公告)日：2023-02-28
申请号：US17532436
申请日：2021-11-22
Applicant: Rolls-Royce plc
Inventor： Pabbathi Venkatesh , Xiong Liu , Stephen J. Mountain
IPC: H02J3/46 , H02J3/38 , B60R16/023 , B60K6/26 , B60W20/00
Abstract: Electrical power systems and methods of controlling electrical power systems are described. One such electrical power system comprises: a first ac bus and a first generator set configured to supply the first ac bus with ac electrical power; a second ac bus and a second generator set, configured to supply the second ac bus with ac electrical power; an interconnecting transformer connected between the first and second ac busses; a primary electrical load connected to both the first and second ac busses via a converter arrangement; an auxiliary load connected to the first ac bus; and a controller configured to control the first generator set according to a first droop control profile and to control the second generator set according to a second droop control profile, the first and second droop control profiles relating respective generator operating frequencies of the first and second generator sets to respective output powers of the first and second generator sets.
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