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A fault-tolerant two-motor drive with FCS-MP-based flux and torque control

A fault-tolerant two-motor drive with FCS-MP-based flux and torque control
A fault-tolerant two-motor drive with FCS-MP-based flux and torque control
Independently controlled multimotor drives are typically realized by using a common dc link and independent sets of three-phase inverters and motors. In the case of an open-circuit fault in an inverter leg, one motor becomes single phase. To enable continued controllable operation by eliminating single phasing, the supply for the motor phase with the faulted inverter leg can be paralleled to a healthy leg of another inverter using hardware reconfiguration. Hence, the two motors are now supplied from a five-leg inverter, which has inherent voltage and current limitations. Theoretically, violating the voltage limit leads to inverter overmodulation and large torque oscillations. It is shown here that the finite-control-set model predictive control, designed to control the machines' stator flux and torque, can consider the inherent voltage limit dynamically in the control loop. Apart from preserving the independent control of the two machines, the additional constraint consideration significantly widens the operating speed ranges of the machines. In particular, it is shown that, whenever the voltage limit is entered, the controller reduces the stator flux level automatically, without requiring external flux reference change. The obtained performance is illustrated using experimental results and is also compared to the conventional two-motor field-oriented control scheme. The control concept is thus fully experimentally verified.
angular velocity control, control system synthesis, fault tolerance, invertors, level control, machine vector control, motor drives, predictive control, stators, torque control, voltage control, fcs-mp-based stator flux control, common dc link, finite-control-set model predictive control, five-leg inverter leg, independently controlled multimotor drive, open-circuit fault-tolerant two-motor drive, overmodulation, single phasing elimination, three-phase inverter, torque oscillation, two-motor field-oriented control scheme, fault tolerant systems, inverters, pulse width modulation, field weakening, flux and torque control, model predictive control, open-circuit fault, two-motor drive
0278-0046
6603-6614
Lim, C.S.
3c5571b0-a770-4808-b55f-fdc89b495fbe
Levi, E.
068c5db6-2328-46b5-aa66-92f6502375fc
Jones, M.
cf34ab48-f4e0-40d8-9ce5-8f3b9cfe236e
Rahim, N. A.
c6f2193e-dedc-4e29-86a6-f22fc4ed6869
Hew, W. P.
b1db4918-62ec-4ba6-8c19-5972ee4d3aa5
Lim, C.S.
3c5571b0-a770-4808-b55f-fdc89b495fbe
Levi, E.
068c5db6-2328-46b5-aa66-92f6502375fc
Jones, M.
cf34ab48-f4e0-40d8-9ce5-8f3b9cfe236e
Rahim, N. A.
c6f2193e-dedc-4e29-86a6-f22fc4ed6869
Hew, W. P.
b1db4918-62ec-4ba6-8c19-5972ee4d3aa5

Lim, C.S., Levi, E., Jones, M., Rahim, N. A. and Hew, W. P. (2014) A fault-tolerant two-motor drive with FCS-MP-based flux and torque control. IEEE Transactions on Industrial Electronics, 61 (12), 6603-6614. (doi:10.1109/TIE.2014.2317135).

Record type: Article

Abstract

Independently controlled multimotor drives are typically realized by using a common dc link and independent sets of three-phase inverters and motors. In the case of an open-circuit fault in an inverter leg, one motor becomes single phase. To enable continued controllable operation by eliminating single phasing, the supply for the motor phase with the faulted inverter leg can be paralleled to a healthy leg of another inverter using hardware reconfiguration. Hence, the two motors are now supplied from a five-leg inverter, which has inherent voltage and current limitations. Theoretically, violating the voltage limit leads to inverter overmodulation and large torque oscillations. It is shown here that the finite-control-set model predictive control, designed to control the machines' stator flux and torque, can consider the inherent voltage limit dynamically in the control loop. Apart from preserving the independent control of the two machines, the additional constraint consideration significantly widens the operating speed ranges of the machines. In particular, it is shown that, whenever the voltage limit is entered, the controller reduces the stator flux level automatically, without requiring external flux reference change. The obtained performance is illustrated using experimental results and is also compared to the conventional two-motor field-oriented control scheme. The control concept is thus fully experimentally verified.

Full text not available from this repository.

More information

Accepted/In Press date: 30 March 2014
e-pub ahead of print date: 14 April 2014
Published date: September 2014
Keywords: angular velocity control, control system synthesis, fault tolerance, invertors, level control, machine vector control, motor drives, predictive control, stators, torque control, voltage control, fcs-mp-based stator flux control, common dc link, finite-control-set model predictive control, five-leg inverter leg, independently controlled multimotor drive, open-circuit fault-tolerant two-motor drive, overmodulation, single phasing elimination, three-phase inverter, torque oscillation, two-motor field-oriented control scheme, fault tolerant systems, inverters, pulse width modulation, field weakening, flux and torque control, model predictive control, open-circuit fault, two-motor drive
Organisations: EEE

Identifiers

Local EPrints ID: 390571
URI: http://eprints.soton.ac.uk/id/eprint/390571
ISSN: 0278-0046
PURE UUID: 1872ce17-81fc-4565-8e55-85df0def589d

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Date deposited: 05 Apr 2016 10:25
Last modified: 15 Jul 2019 20:39

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