Rolls-royce Corporation

Zhigang Sun

David Reginald Trainer

Ellis F H Chong

Ellis Fh Chong

Jiabin Wang

Shangjian Dai

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 (i, i) representative of a measured PMSM current; determining d-axis and q-axis reference current values (i*, i*); based on the stator current values (i, i) and the reference current values (i*, i*), determining d-axis and q-axis current correction values (C, C); determining corrected reference current values (i**, i**) as a sum of the reference current values (i*, i*) and the current correction values (C, C); and controlling the PMSM drive using the corrected reference current values (i**, i**) 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.

Permanent magnet electric machine control

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.

Voltage converter

An electrical converter () having an active diode-clamped multilevel topology is shown. Each clamping diode is connected in antiparallel with a switch (SA, SB). The converter comprises polyphase supply phases (A, B, C) each of which are connected via a respective phase leg () to dc rails () and a dc-link capacitor. The dc-link capacitor includes a plurality of series-connected capacitors (). 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 () between two capacitors in the dc-link capacitor, thereby connecting each phase to the same node.

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Derby, United Kingdom

Zhigang Sun