Introduction

Isermann, Rolf

doi:10.1007/978-3-642-86417-9_1

Cited by 9 publications

(7 citation statements)

References 1 publication

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“…Although from practical standpoint, the dead-beat response is not a good choice (in terms of its robustness properties), dead-beat control has considerable theoretical importance, which attracted a lot of attention in the systems theory literature (for example, O 'Reilly, 1981;Glad, 1987;Isermann, 1989). The closed-loop response of Eq.…”

Section: Inputloutput Linearizing Feedbackmentioning

confidence: 99%

Discrete‐time nonlinear controller synthesis by input/output linearization

Soroush

Kravaris

1992

AIChE Journal

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This work concerns the synthesis of discrete-time nonlinear controllers for nonlinear processes that make the closed-loop system linear in an input/output sense.The synthesis of state feedback controllers is studied first, followed b.y the synthesis of dynamic output feedback controllers. Both problems are solved within the globally linearizing control ( GLC) framework. Precise theoretical connections between the derived controllers and model algorithmic control ( M A C ) are established. The theory is illustrated by a chemical reactor example.

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Section: Inputloutput Linearizing Feedbackmentioning

confidence: 99%

Discrete‐time nonlinear controller synthesis by input/output linearization

Soroush

Kravaris

1992

AIChE Journal

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“…Minimal-order state-space realizations of the transfer function of Eq. 29 can be found in standard linear systems literature (Isermann, 1989). For example, the state-space realization:…”

Section: Minimum-phase Behavior In Discrete-time Systems With Disturbmentioning

confidence: 99%

Synthesis of discrete‐time nonlinear feedforward/feedback controllers

Soroush¹,

Kravaris²

1994

AIChE Journal

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“…As described in (29) , the observer poles have to be faster than the motor poles but not too faster to reduce the effects of the current vector measurement noise. To decide the observer poles position, it is useful to consider the root locus of the discrete motor model for the entire motor speed range (Fig.…”

Section: Asfo Design Proceduresmentioning

confidence: 99%

“…A linear dynamic system can be described by the following state equation system in the continuous time domain (29) …”

Section: Speed Adaptive Stator Flux Observermentioning

confidence: 99%

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Direct Torque Control with Full Order Stator Flux Observer for Dual-Three Phase Induction Motor Drives

et al. 2006

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Keywords: DTC, dual-three phase induction motor, stator flux observer, constant inverter switching frequency SummaryThe main advantage of multi-phase drives is the possibility to divide the controlled power on more inverter legs. That will reduce the current stress of each switch, compared with a three-phase converter. For this reason, multi-phase drives are convenient in highpower and/or high-current applications, such as ship propulsion, aerospace applications, and electric/hybrid vehicles.A very interesting and discussed multi-phase solution is the dual three-phase induction machine having two sets of three-phase windings spatially shifted by 30 electrical degrees with isolated neutral points (Fig. 1).Traction drives require an accurate control of the machine flux and torque. For this reason, Rotor Field Oriented Control (RFOC) solutions have been proposed in order to get decoupled control of the flux and torque.These schemes must use current control loops to impose the flux and torque producing stator current components resulting in a quite complicated control scheme. An alternative solution is the use of Direct Torque Control (DTC) strategies.For these reasons, the proposed paper deals with a DTC solution for dual-three phase induction motor drives. The proposed solution uses simple PI regulators implemented in the stator flux synchronous reference frame to get a robust control scheme against parameters detuning. The flux estimator scheme employs an Adaptive Stator Flux Observer (ASFO) combined with a current-speed (I-ω) based stator flux estimator. The (I-ω) estimator is used to get the stator flux only at low speed, while the ASFO provides the flux Fig. 1. Dual-three phase induction machine estimation for the remaining speed range. Doing so, besides getting an accurate flux estimation, it is possible to use the observed currents to compensate the inverter dead-time effects at low speed. This is particularly important for low voltage/high current applications, as the drive considered in this paper.The advantages of the discussed control strategy are: constant inverter switching frequency, good transient and steady-state performance and less distorted machine currents in contrast to DTC schemes with variable switching frequency.Experimental results are presented for a 10 kW dual three-phase induction motor drive prototype. The motor is supplied by a battery fed six-phase IGBT inverter whilst the control algorithm has been implemented on the dSPACE DS1103 PPC Controller Board. A start-up of the drive to 6500 rpm followed by a speed reversal is shown in Fig. 2 where are illustrated the rotor reference and actual speed, the pull-out and estimated electromagnetic torque and the estimated stator flux. The field-weakening strategy computes the stator flux reference according to the available DC-link voltage and limits the reference torque in order to get a safe and stable drive operation up to the maximum speed.The obtained results show good control performance for the whole drive speed range. The proposed DTC al...

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Introduction

Cited by 9 publications

References 1 publication

Discrete‐time nonlinear controller synthesis by input/output linearization

Discrete‐time nonlinear controller synthesis by input/output linearization

Synthesis of discrete‐time nonlinear feedforward/feedback controllers

Direct Torque Control with Full Order Stator Flux Observer for Dual-Three Phase Induction Motor Drives

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