Field-Oriented Control of Induction Machines in the Presence of Magnetic Saturation

Levi, E.; Vučković, Vladan

doi:10.1080/07313568908909367

Cited by 57 publications

(11 citation statements)

References 7 publications

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“…The same model is used to represent the induction machine when only iron loss is considered, whereas main ux saturation is neglected (magnetizing inductance is equated to the constant rated value). For studies concerned with main ux saturation only (iron loss neglected), induction machine is represented with the current state-space saturated machine model in stationary reference frame (Levi and Vuckovic, 1989). Equivalent iron loss resistance approximation is given in the Appendix, together with the induction machine data.…”

Section: Induction M Achine M Odeling For Simulation Purposesmentioning

confidence: 99%

“…Such a situation arises when compensation of detuning due to main ux saturation and/ or iron loss is to be achieved. Model-based approach has been extensively used in the past to achieve main ux saturation compensation (Levi and Vuckovic, 1989;Levi et al, 1990;Levi and Vuckovic, 1993;Williamson and Healey, 1996;Levi and Sokola, 1997) and iron loss compensation (Levi, 1995;Levi et al, 1996) in vector-controlled drives that do posses a speed (position) sensor; however, so far very little eOE ort has been put into compensation of these phenomena by means of the model-based approach in sensorless vector-controlled induction motor drives, the exceptions being the works of (Levi et al, 1999;Blasco-Gimenez et al, 1996c). A modi ed rotor ux-based speed estimator of MRAC type that provides compensation of iron loss in conjunction with the modi ed indirect feedforward vector controller is introduced by (Levi et al, 1999), and its suitability is con rmed by steady-state analysis.…”

Section: Introductionmentioning

confidence: 99%

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Compensation of Parameter Variation Effects in Sensorless Indirect Vector Controlled Induction Machines Using Model-Based Approach

Levi¹

1999

Electric Machines & Power Systems

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The majority of speed estimation schemes for sensorless vector control of induction machines use a mathematical model of the machine in the estimation process. These schemes are therefore inherently sensitive to parameter variation eOE ects in the machine. The variety of speed estimation methods makes any attempt to develop a universal approach to compensation of parameter variation eOE ects impossible. This paper concentrates on one of the most frequently used schemes, in which speed is estimated using model reference adaptive control approach (MRAC) on the basis of two estimated values of the rotor ux space vector. The estimator is analyzed in conjunction with indirect feed-forward rotor ux-oriented induction machine. An attempt is made to improve the accuracy of the speed estimation by appropriate modi cation of the speed estimator and the indirect vector controller structures using modi ed induction motor models that account for one or more of the phenomena that are neglected in development of the basic constant parameter scheme. In particular, compensation of main ux saturation, compensation of iron loss, and simultaneous compensation of both the iron loss and main ux saturation are elaborated. Novel structures of the speed estimator are developed for each of the three cases and are applied in conjunction with the appropriate modi ed form of the indirect rotor ux-oriented controller. Excellent compensation capability is demonstrated in all the cases by performing extensive simulation studies.

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Section: Induction M Achine M Odeling For Simulation Purposesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compensation of Parameter Variation Effects in Sensorless Indirect Vector Controlled Induction Machines Using Model-Based Approach

Levi¹

1999

Electric Machines & Power Systems

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“…10 and 11 would require that the controller track the nonlinear flux variation associated with the large magnetizing current [5]. While this is feasible using a magnetization curve stored in table form, it is useful to consider the performance obtained with a simple controller using a fixed value of the rotor time constant.…”

Section: Effect Of Non Ideal Field Oriented Controlmentioning

confidence: 99%

“…Fig. 9 shows the model of a field oriented induction motor in the synchronous frame, as described by (1) through (5). By applying the field oriented condition, the rotor flux will always be aligned in the d-axis, resulting in the q-axis flux relationship, A:, = 0.…”

Section: A Field Orientation Controllermentioning

confidence: 99%

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Increasing the dynamic torque per ampere capability of induction machines

Wallace

Novotny

Lorenz

et al. 1994

IEEE Trans. on Ind. Applicat.

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Abstract-The objective of this paper is to present a novel means of increasing the dynamic torque per ampere capability of induction machines. The method developed is based on use of an indirect field oriented controller (IFOC) for the induction machine. It is well known that IFOC allows the rotor flux amplitude to be controlled by the d-axis component of stator current. It is also well established that the flux-producing component of the stator current may be controlled independent of the torque-producing component of the stator current. The principal constraint, however, is that the amplitude of the peak current (the vector amplitude) is limited by the power electronic switch ratings. This constraint implies that optimal partitioning of the current components should be possible. Previously used methods have optimized steady state efficiency or steady state torque per ampere. This paper identifies a dynamic method which achieves transient torques over 35% greater than the prior methods. The limitations of the method and its sensitivity to detuning is also examined.

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Magnetic Variables Control

Levi

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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The sections in this article are Mathematical Modeling of an Induction Machine Principles of Vector Control of Induction Machines Parameter Variation Effects in Rotor Flux Oriented Induction Machines Compensation of Parameter Variation Effects Optimal Efficiency Control Speed‐Sensorless Control Trends in Vector Control of Induction Machines

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Field-Oriented Control of Induction Machines in the Presence of Magnetic Saturation

Cited by 57 publications

References 7 publications

Compensation of Parameter Variation Effects in Sensorless Indirect Vector Controlled Induction Machines Using Model-Based Approach

Compensation of Parameter Variation Effects in Sensorless Indirect Vector Controlled Induction Machines Using Model-Based Approach

Increasing the dynamic torque per ampere capability of induction machines

Magnetic Variables Control

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