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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：US10971927B2
公开(公告)日：2021-04-06
申请号：US16451455
申请日：2019-06-25
Applicant: ROLLS-ROYCE plc
Inventor： Chandana J Gajanayake , Pradip Chatterjee , Michael A Zagrodnik
Abstract: There is described a device for controlling an amount of current within a power distribution network by manipulating the amount of magnetic flux in the device and thus the impedance experienced by the power distribution network across the device. This is achieved by winding a plurality of coils about a magnetically permeable core and by providing the device with a magnetically permeable bridge element that is movable between a fully-open position at which the net magnetic flux generated in the core by alternating currents in each coil is zero, and a fully-closed position at which a net magnetic flux is present in the core.
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