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This paper presents a novel online parameter estimation method to overcome the negative influence of parameter mismatch on the field orientation and then on the performance of the indirect field oriented induction motor drives. This method allows for parallel estimation of the rotor resistance and the mutual inductance, which tend to deviate from their nominal values resulting from changes in temperature...
The main goal of this paper is to provide a novel method of parallel rotor resistance and rotor speed estimation for sensorless indirect field oriented controlled induction motor drive. In this scheme, a parallel model reference adaptive system (MRAS) is designed to simultaneous estimation of rotor speed and rotor resistance in order to achieve high-precise control in a wide range of motor speed....
To improve the performance of a sensorless indirect field oriented control of induction drive a speed estimation method insensitive to machines parameters using model reference adaptive system (MRAS) along with online identification of rotor time constant is proposed. Proposed speed identification method uses reactive power as tuning signal for estimating the speed. In conventional MRAS methods, reference...
Various MRAS-based estimation schemes of IM's rotor resistance has been proposed. Three simple rotor resistance identification methods of an induction motor drive are presented and compared. Two of the three techniques namely, electromagnetic torque equation, and reactive power equations are based on the generalization of existing methods. Authors proposed the third method, namely, active power equation...
MRAS estimators have become increasingly popular due to their ease of computational usage, flexibility and accurateness in determining the rotor speed of induction motors without speed sensors mounted on the shaft. This paper considers the three most popularly used configurations of MRAS Speed Estimators i.e., Rotor Flux, Back-EMF and Instantaneous Reactive power. The dynamic performance of the same...
A unique formation of model reference adaptive reference (MRAS) using, active power (P), reactive power (Q) and fictitious quantities (X and Y) as the functional candidates is presented. The formulation of MRAS in the proposed form has the advantage that, no machine parameters are involved, except the rotor resistance. The reference and adjustable model of modified MRAS are computed in rotating reference...
Indirect field oriented vector control relies on the estimation of rotor flux and its synchronous angle to ascertain decoupling of torque and flux. This estimation is based on the calculation of slip-speed and current model both of which are prone to the detuning of rotor electrical parameters. This paper aims to resolve this issue by online adapting rotor winding resistance using the reactive power...
This paper deals with rotor resistance estimation for induction motors drives purpose. A novel MRAS structure for rotor resistance adaptation is proposed. It is based mainly on the use of a very robust sliding mode flux observer as reference model, which gives robustness to the whole parameter estimation operation. Unlike to classical MRAS structure, based on the use of pure integrators, which have...
In this paper, a detailed study of the performance of rotor flux and reactive power based MRAS rotor resistance estimators for Vector Controlled Induction Motor drive is presented. The rotor resistance changes significantly during operation of the drive due to temperature rise and saturation. This variation has a major influence on the performance of the field oriented control of induction motor drive...
Vector control schemes are increasingly used in induction motor drive systems to obtain high performance. Vector Control transforms the control of an induction motor to that of a separately excited dc motor by creating independent channels for flux and torque control. The successful implementation of the vector control scheme requires the knowledge of the instantaneous position of rotor flux which...
In this paper, a detailed study of the performance of Vector Controlled Induction Motor drive with Model Reference Adaptive System (MRAS) based Rotor Resistance Estimator using Reactive Power is presented. The rotor resistance changes significantly during operation due to temperature rise. This variation has a major influence on the field oriented control performance of an induction motor drive due...
In order to avoid the influence of speed sensor and the parameter change as a result of the temperature variety on the system performance, a sensor-less vector control system based on model reference adaptive system (MRAS) for asynchronous motor is described in this paper. The rotor speed and magnetic flux are identified online with full order adaptive observers correctly and rapidly. The simulation...
This paper presents a new adaptive speed estimation technique for the vector controlled induction motor drive. A model reference adaptive system (MRAS) is formed using instantaneous and steady state values of V * × I in the reference and adjustable models respectively. Such formulation does not require flux estimation and is stable in all the 4- quadrants of operation. Proposed MRAS with stator resistance...
A speed estimation method is presented in this paper for a grid connected doubly-fed slip-ring induction motor drive. The proposed method is formulated with reactive power based model reference adaptive system (MRAS). The method does not require any estimation of flux and is also independent of stator and rotor resistance variation. Extensive simulation results are presented to validate the technique...
Two different speed estimation techniques for the doubly fed induction machines (DFIM) are reported here. One of the methods is based on reactive power and the other is based on the computation of flux. Model reference adaptive systems (MRAS) are formulated for speed estimation. The uniqueness of the reactive power based MRAS is that the instantaneous reactive power (IRP) is used in the reference...
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