公开(公告)号：US20190288624A1

公开(公告)日：2019-09-19

申请号：US16279594

申请日：2019-02-19

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

Inventor： Amit K GUPTA ,  Johannes DEMHARTER ,  Yang SHICONG ,  Souvik DASGUPTA ,  Michael KREISSL ,  Abhisek UKIL

IPC: H02P9/10 ,  H02K7/18 ,  H02H3/02 ,  H02P3/26 ,  H02P3/22

Abstract: There is disclosed a fault ride-through system for use in a power system comprising a synchronous generator driven by a prime mover. The fault ride-through system comprises a mechanical switch connected in parallel with a dynamic power dissipater, wherein the dynamic power dissipater comprises a solid-state switch connected in series with a braking resistor. A controller is configured to control the mechanical switch and the solid-state switch to control the current through the braking resistor, based on received data indicative of one or more operation parameters of the power system.

公开(公告)号：US20220126713A1

公开(公告)日：2022-04-28

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 ,  B60W10/08 ,  B60W10/26 ,  H02J7/14

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：US20180045784A1

公开(公告)日：2018-02-15

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: G01R31/34 ,  G01R23/16 ,  G01R33/09

CPC classification number: G01R31/343 ,  G01R23/16 ,  G01R33/09 ,  G01R33/1215

Abstract: There is disclosed a method for diagnosing a fault condition in an electric machine 4, the electric machine 4 comprising a rotor 10 having an axis of rotation 14 and comprising a plurality of permanent magnets M1-M8. The method comprises: rotating the rotor 10 so that each of the plurality of permanent magnets M1-M8 passes a magnetic flux density sensor 6; measuring values of magnetic flux density using the magnetic flux density sensor 6 at a plurality of positions of the rotor 10; analysing the measured values of magnetic flux density and comparing a magnitude of a peak amplitude in a time or frequency domain with a reference value; and if the peak amplitude is below the reference value, determining that the electric machine 4 has a fault condition.

公开(公告)号：US20210075331A1

公开(公告)日：2021-03-11

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 ,  H02M3/337 ,  H02M3/158 ,  B60L53/20 ,  H01F30/04 ,  H02J7/00

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：US20200241067A1

公开(公告)日：2020-07-30

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

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.