公开(公告)号：US11063527B2

公开(公告)日：2021-07-13

申请号：US16570739

申请日：2019-09-13

Applicant: ROLLS-ROYCE plc

Inventor： David R. Trainer ,  Ellis F H Chong ,  Zhigang Sun

IPC: H02M7/217 ,  H02M7/23 ,  H02M7/25

Abstract: An electrical converter (203) having an active diode-clamped multilevel topology is shown. Each clamping diode is connected in antiparallel with a switch (S5A, S5B). The converter comprises polyphase supply phases (A, B, C) each of which are connected via a respective phase leg (401, 402, 403) to dc rails (301, 302) and a dc-link capacitor. The dc-link capacitor includes a plurality of series-connected capacitors (404, 405). A controller is configured to, in response to an event signal, for each phase leg, activate a combination of switches therein to form a pair of parallel conduction paths to a midpoint (406) between two capacitors in the dc-link capacitor, thereby connecting each phase to the same node.

公开(公告)号：US11121639B2

公开(公告)日：2021-09-14

申请号：US16747760

申请日：2020-01-21

Applicant: ROLLS-ROYCE plc

Inventor： David R Trainer ,  Zhigang Sun ,  Ellis F H Chong

IPC: H02M7/219 ,  F02C6/00 ,  H02P9/30 ,  H02M1/14

Abstract: Disclosed herein is a converter for converting an AC voltage to a DC voltage, the converter comprising: a first H-bridge circuit comprising a first AC terminal for receiving an AC voltage, a second AC terminal, a first DC terminal and a second DC terminal; a second H-bridge circuit comprising a first AC terminal for receiving an AC voltage, a second AC terminal, a first DC terminal and a second DC terminal; an isolation block arranged between the second AC terminal of the first H-bridge circuit and the second AC terminal of the second H-bridge circuit; and a DC voltage output of the converter with a first terminal and a second terminal; wherein: the first terminal of the DC voltage output is connected to the first DC terminal of the first H-bridge circuit and the first DC terminal of the second H-bridge circuit; and the second terminal of the DC voltage output is connected to the second DC terminal of the first H-bridge circuit and the second DC terminal of the second H-bridge circuit.

公开(公告)号：US11881796B2

公开(公告)日：2024-01-23

申请号：US17746189

申请日：2022-05-17

Applicant: ROLLS-ROYCE plc

Inventor： Shangjian Dai ,  Zhigang Sun ,  Ellis Fh Chong ,  Jiabin Wang

IPC: H02P21/00 ,  H02P21/22 ,  B64D27/24 ,  B64D31/06 ,  H02P101/30

CPC classification number: H02P21/0003 ,  B64D27/24 ,  B64D31/06 ,  H02P21/22 ,  H02P2101/30

Abstract: A method of controlling a permanent magnet synchronous electric machine (PMSM) drive using a Deadbeat Predictive Current Control (DBPCC) scheme is provided. The method comprises: determining d-axis and q-axis stator current values (id, iq) representative of a measured PMSM current; determining d-axis and q-axis reference current values (id*, iq*); based on the stator current values (id, iq) and the reference current values (id*, iq*), determining d-axis and q-axis current correction values (Cd, Cq); determining corrected reference current values (id**, iq**) as a sum of the reference current values (id*, iq*) and the current correction values (Cd, Cq); and controlling the PMSM drive using the corrected reference current values (id**, iq**) as reference current inputs of the DBPCC scheme. A controller for performing the method; a system comprising the controller, a PMSM and associated power electronics; and a computer program for performing the method are also provided.