公开(公告)号：US11079255B2

公开(公告)日：2021-08-03

申请号：US16401638

申请日：2019-05-02

Applicant: ROLLS-ROYCE plc ,  MTU FRIEDRICHSHAFEN GMBH ,  MTU ONSITE ENERGY GMBH

Inventor： Johannes Demharter ,  Souvik Dasgupta ,  Michael Kreissl ,  Amit K Gupta ,  Vsk Murthy Balijepalli

IPC: G01D5/242 ,  H02P9/00

Abstract: A method determines a generator system load and/or rotor angle. The generator system has a generator with a generator terminal outputting electrical power generated by the generator, a transformer and a point of common coupling, PCC, terminal. The transformer is between the generator and PCC terminals. The method includes: determining the generator field current; determining the output voltage, the output current and the power factor and/or angle of the output voltage and output current from the generator terminal, and determining the load angle of the generator system, output voltage from the generator terminal, output current from the generator terminal and the power factor and/or angle; and/or determining the output voltage, the output current and the power factor and/or angle of the output voltage and output current, and determining the rotor angle of the generator system, output voltage, output current from the PCC terminal and the power factor and/or angle.

公开(公告)号：US11287465B2

公开(公告)日：2022-03-29

申请号：US16750235

申请日：2020-01-23

Applicant: ROLLS-ROYCE plc

Inventor： Mohamed Sathik Mohamed Halick ,  Chandana J Gajanayake ,  Sundararajan Prasanth ,  Rejeki Simanjorang ,  Amit K Gupta

IPC: G01R31/26 ,  G01D3/08 ,  G01R31/42 ,  G01R31/27 ,  H02M1/00 ,  H03K17/082 ,  H03K17/689 ,  H03K17/78

Abstract: An operating condition monitor (100) for monitoring an operating condition of a transistor-based power converter (102), comprising: a sensing apparatus (106) configured to measure a turn-off transient energy of the power converter (102), a processor (108) in communication with the sensing apparatus (106) to receive the measurement of the turn-off transient energy, the processor being configured to: compare the measurement of the turn-off transient energy to a threshold; and issue an event signal based on the comparison to the threshold meeting a comparison criterion. A method (200, 200′) of monitoring an operating state of a transistor-based power converter is also disclosed.

公开(公告)号：US10931217B2

公开(公告)日：2021-02-23

申请号：US16401543

申请日：2019-05-02

Applicant: ROLLS-ROYCE plc ,  MTU FRIEDRICHSHAFEN GMBH ,  MTU ONSITE ENERGY GMBH

Inventor： Souvik Dasgupta ,  Johannes Demharter ,  Michael Kreissl ,  Yang Shicong ,  Amit K Gupta

IPC: H02P9/00 ,  G01D5/242

Abstract: A power system, including: a synchronous electrical generator having a rotor; and an angle computation unit configured to: determine a rotor angle in a steady state period of the synchronous electrical generator, determine a change in rotor angle in a transient period of the synchronous electrical generator, and estimate the rotor angle in the transient period based on the steady state rotor angle and the change in rotor angle.

公开(公告)号：US10338143B2

公开(公告)日：2019-07-02

申请号：US15653054

申请日：2017-07-18

Applicant: ROLLS-ROYCE plc

Inventor： Chandana J Gajanayake ,  Sivakumar Nadarajan ,  Amit K Gupta ,  Chao Bi ,  Nay Lin Htun Aung ,  Jiang Quan

IPC: G01R31/00 ,  G01R31/34 ,  G01R23/16 ,  G01R33/09 ,  G01R33/12

Abstract: A fault condition is diagnosed in an electric machine that includes a rotor and a plurality of permanent magnets. To do so, the rotor is rotated so that each of the plurality of permanent magnets passes a magnetic flux density sensor, and the values of magnetic flux density are measured using the magnetic flux density sensor at a plurality of positions of the rotor. The measured values of magnetic flux density are analyzed and a magnitude of a peak amplitude is compared in a time or frequency domain with a reference value. If the peak amplitude is below the reference value, the electric machine is determined to have a fault condition.

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

IPC: B60L53/20 ,  H02J7/14 ,  B60W10/08 ,  B60W10/26

CPC classification number: B60L53/20 ,  B60W10/08 ,  B60W10/26 ,  H02J7/143

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.

公开(公告)号：US11671025B2

公开(公告)日：2023-06-06

申请号：US16999680

申请日：2020-08-21

Applicant: ROLLS-ROYCE plc

Inventor： Mohd Tariq ,  Chandana J Gajanayake ,  Ali I Maswood ,  Amit K Gupta

IPC: H02M3/335 ,  B60L53/20 ,  H01F30/04 ,  H02J7/00 ,  H02M3/158 ,  H02M3/337

CPC classification number: H02M3/33584 ,  B60L53/20 ,  H01F30/04 ,  H02J7/007 ,  H02M3/158 ,  H02M3/3376 ,  B60L2200/10 ,  B60L2210/10 ,  B60L2210/40 ,  H02J2207/20

Abstract: Electrical power distribution systems and methods of operating electrical power distribution systems are provided. One electrical power distribution system comprises: an electrical power storage unit; a transformer; a first bidirectional converter circuit connected between the electrical power storage unit and a first winding of the transformer; a first DC bus; a second DC bus; a second bidirectional converter circuit connected between the first DC bus and a second winding of the transformer; a third bidirectional converter circuit connected between the second DC bus and a third winding of the transformer; and a controller connected for control of the first, second and third converter circuits to distribute electrical power between the electrical power storage unit, the first DC bus and the second DC bus.

公开(公告)号：US10770997B2

公开(公告)日：2020-09-08

申请号：US16401570

申请日：2019-05-02

Applicant: ROLLS-ROYCE plc ,  MTU FRIEDRICHSHAFEN GMBH ,  MTU ONSITE ENERGY GMBH

Inventor： Yang Shicong ,  Souvik Dasgupta ,  Michael Kreissl ,  Johannes Demharter ,  Amit K Gupta

IPC: H02P9/10 ,  H02K19/36 ,  H02P9/00

Abstract: A power system includes a synchronous electrical generator having a rotor driven by a shaft; a permanent magnet signaling generator, coupled to the shaft; and an angle computation unit configured to calculate a rotor angle or load angle based on a voltage from the permanent magnet signaling generator and a voltage from the synchronous electrical generator.