Indirect field-oriented control of induction motors is robustly globally stable (original) (raw)
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Theoretical and experimental comparison of indirect field-oriented controllers for induction motors
IEEE Transactions on Power Electronics, 2003
A theoretical and experimental comparison between standard and recently-developed improved indirect field-oriented controllers for induction motors is presented. It is shown that standard indirect field-oriented control algorithm provides asymptotic speed and flux regulation, while the improved one guarantees global exponential speed-flux tracking under condition of constant load torque. The difference between the flux sub-system design for the two controllers is analyzed. It is shown that the improved controller provides closed loop properties for flux subsystem when motor is rotating, leading to robust stabilization of the rotor flux vector space position and robust tracking of its modulus. It is demonstrated that both controllers have similar complexity and can be tuned using standard procedure for cascaded systems. Intensive experimental study shows that improved controller provides about one order higher speed tracking performance as compared with standard solution. Moreover, improved robustness with respect to rotor parameters variation leads to improved energy efficiency and robust stabilization of dynamic performance.
Modeling and control of induction motors
2001
This paper is devoted to the modeling and control of the induction motor. The well-established field oriented control is recalled and two recent control strategies are exposed, namely the passivity-based control and the flatness-based control.
Field-oriented control of induction motors with direct rotor current estimation
2004
A novel nonlinear affine model for the induction motor with core loss is developed in the well known ( ) d q reference frame. The core is represented with a resistance in parallel with the magnetization inductance. Then, an optimal rotor flux modulus is calculated such that, the power loss due to stator, rotor and core resistances is minimized, and as a consequence the motor efficiency is raised; therefore this flux modulus is forced to be tracked by the induction motor along with a desired rotor velocity by means of a field oriented controller. A simulation study is carried on, where the superior performance of the proposed controller is put in evidence when compared to the same controller when not taking into account an optimal flux modulus.
Electrical and Electronics Engineering: An International Journal, 2016
Induction motor with rotor flux based indirect field oriented control is well suited for high performance applications due to its excellent dynamic behavior. The overriding feature of this control method is its ease of implementation and linearity of the torque versus slip characteristics. But, the indirect field oriented controller is sensitive to variations in motor parameters, especially variation in rotor time constant. This paper presents the modeling and analysis of a voltage controlled rotor flux based indirect field oriented control induction motor motion control system. with detailed analysis of controller design in discrete system. The influence of rotor resistance variation on the performance of drive like effect on speed, rotor flux and electromagnetic torque under different operating is also studied.
— Field oriented control is from the best methods to control the AC drives this is because this method of control transfers the advantages of DC drives into AC drives. With using this method of control, the torque per ampere for AC machines increases, the dynamic performance becomes higher, transient and steady state performance become improvement. This paper is comparing between the steady state characteristics of induction motor with using the field oriented control and scalar control to show the advantages of the field oriented control comparing to scalar control. this studying not only concerned with constant flux region but also focused in the field weakening region. The MATLAB program is used to studying the steady state performance characteristics of induction motor with field oriented control and scalar control.
More than half of the total electrical energy produced in developed countries is converted into mechanical energy in electric motors, freeing the society from the tedious burden of physical labor. Among many types of the motors, three-phase induction machines still enjoy the same unparalleled popularity as they did a century ago. At least 90% of industrial drive systems employ induction motors. Most of the motors are uncontrolled, but the share of adjustable speed induction motor drives fed from power electronic converters is steadily increasing, phasing out dc drives. It is estimated that more than 50 billion dollars could be saved annually by replacing all "dumb" motors with controlled ones. However, control of induction machines is a much more challenging task than control of dc motors. Two major difficulties are the necessity of providing adjustable-frequency voltage (dc motors are controlled by adjusting the magnitude of supply voltage) and the nonlinearity and complexity of analytical model of the motor, aggrandized by parameter uncertainty. As indicated by the title, this book is devoted to various aspects of control of induction motors. In contrast to the several existing monographs XI XII CONTROL OF INDUCTION MOTORS
Tuning rules for the PI gains of field-oriented controllers of induction motors
IEEE Transactions on Industrial Electronics, 2000
In a recent contribution, the authors have shown that field-oriented controllers for induction motors preserve stability under a wide range of variations of the motor and controller parameters. However, as is well known, the transient performance critically depends on the tuning of the gains of the proportional-integral (PI) velocity loop, a task which is rendered difficult because of the high uncertainty on the rotor resistance. The problem we address in this paper is how to develop an offline procedure to choose these gains. The main contribution of our work is a very simple frequency-domain test that, for each setting of the PI gains, evaluates the maximum range of the relative rotor resistance estimate for which global stability is guaranteed. In this way, we provide a quantitative estimate of the performance of the PI controller. The stability result may also be used in a dual manner, fixing now the range of the rotor resistance, and estimating an admissible interval for the PI gains that preserves global stability. Instrumental for our study is the exploitation of an energy dissipation (strict passivity) property of the system.