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An improved two-motor three-phase drive using FCS-MPC based flux and torque control with voltage constraint consideration

An improved two-motor three-phase drive using FCS-MPC based flux and torque control with voltage constraint consideration
An improved two-motor three-phase drive using FCS-MPC based flux and torque control with voltage constraint consideration
This paper presents a flux and torque control scheme, based on finite-control-set model predictive control (FCS-MPC), for two three-phase induction motors supplied by a five-leg two-level inverter. The reduced-switch-count topology with leg sharing inherently imposes an additional constraint on the voltages in the system. In the best available PWM-based control scheme for this topology, the constraint means that, in simple terms, the sum of speeds of two machines cannot exceed the rated speed of one machine, in order to avoid over-modulation and large torque oscillations. In essence, no provision exists to account for the additional voltage limit of the topology. It will be shown here that the FCS-MPC can consider the voltage constraint dynamically in the control loop, and hence, apart from preserving the independent control of the two machines, it can significantly widen the speed operating range. Three different cost functions, corresponding to three operating modes, are considered. The unique way in which the MPC handles tracking errors allows the motors to operate dynamically in the base speed region with field weakening, without requiring any external change of the flux references. Simulation and preliminary experimental results verify the theory.
PWM invertors, induction motors, machine control, magnetic flux, predictive control, torque control, FCS-MPC, PWM-based control scheme, base speed region, control loop, cost function, finite-control-set model predictive control, five-leg two-level inverter, flux control, large torque oscillation, leg sharing, over-modulation, reduced-switch-count topology, three-phase induction motor, two-motor three-phase drive improvement, voltage constraint, Cost function, Rotors, Stators, Switches, Topology, Torque, Vectors, Two-motor drive, field weakening, model predictive control
188-195
Lim, Chee Shen
616d0697-a5d5-4079-adaa-6686e5a758fe
Levi, E.
068c5db6-2328-46b5-aa66-92f6502375fc
Jones, M.
cf34ab48-f4e0-40d8-9ce5-8f3b9cfe236e
Rahim, N.A.
f18d145d-e792-43ab-8283-63d8802213a9
Hew, W.P.
a23d7286-140c-44cc-84fc-5e78a97dc062
Lim, Chee Shen
616d0697-a5d5-4079-adaa-6686e5a758fe
Levi, E.
068c5db6-2328-46b5-aa66-92f6502375fc
Jones, M.
cf34ab48-f4e0-40d8-9ce5-8f3b9cfe236e
Rahim, N.A.
f18d145d-e792-43ab-8283-63d8802213a9
Hew, W.P.
a23d7286-140c-44cc-84fc-5e78a97dc062

Lim, Chee Shen, Levi, E., Jones, M., Rahim, N.A. and Hew, W.P. (2013) An improved two-motor three-phase drive using FCS-MPC based flux and torque control with voltage constraint consideration. IEEE International Electric Machines Drives Conference IEMDC, Chicago, United States. 11 - 14 May 2013. pp. 188-195 . (doi:10.1109/IEMDC.2013.6556252).

Record type: Conference or Workshop Item (Paper)

Abstract

This paper presents a flux and torque control scheme, based on finite-control-set model predictive control (FCS-MPC), for two three-phase induction motors supplied by a five-leg two-level inverter. The reduced-switch-count topology with leg sharing inherently imposes an additional constraint on the voltages in the system. In the best available PWM-based control scheme for this topology, the constraint means that, in simple terms, the sum of speeds of two machines cannot exceed the rated speed of one machine, in order to avoid over-modulation and large torque oscillations. In essence, no provision exists to account for the additional voltage limit of the topology. It will be shown here that the FCS-MPC can consider the voltage constraint dynamically in the control loop, and hence, apart from preserving the independent control of the two machines, it can significantly widen the speed operating range. Three different cost functions, corresponding to three operating modes, are considered. The unique way in which the MPC handles tracking errors allows the motors to operate dynamically in the base speed region with field weakening, without requiring any external change of the flux references. Simulation and preliminary experimental results verify the theory.

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More information

e-pub ahead of print date: May 2013
Venue - Dates: IEEE International Electric Machines Drives Conference IEMDC, Chicago, United States, 2013-05-11 - 2013-05-14
Keywords: PWM invertors, induction motors, machine control, magnetic flux, predictive control, torque control, FCS-MPC, PWM-based control scheme, base speed region, control loop, cost function, finite-control-set model predictive control, five-leg two-level inverter, flux control, large torque oscillation, leg sharing, over-modulation, reduced-switch-count topology, three-phase induction motor, two-motor three-phase drive improvement, voltage constraint, Cost function, Rotors, Stators, Switches, Topology, Torque, Vectors, Two-motor drive, field weakening, model predictive control
Organisations: EEE

Identifiers

Local EPrints ID: 390575
URI: http://eprints.soton.ac.uk/id/eprint/390575
PURE UUID: 6b4c3d80-f451-410b-be2d-f8a6c7303ad6

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Date deposited: 19 Apr 2016 10:35
Last modified: 12 Aug 2020 16:32

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