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This paper deals with the stability analysis of the well-known Adaptive Full-Order Observer for the speed estimation of induction motor drive in a motoring and regenerating mode, under motor parameter mismatch. The influence of the identification errors of the stator and rotor resistance and magnetizing inductance on unstable operating points regions of the estimator with the modified adaptation algorithm...
This paper presents a novel V/f control method for speed sensorless induction motor drives. The proposed method keeps a constant steady-state stator flux in d axis by adding the stator resistance compensation. And the speed accuracy is improved by using the precise slip frequency compensation. Besides, a novel oscillation suppression compensation method is proposed to improve the stability and convergence...
This paper proposes a self-scheduled control method for the induction motor. We design a controller with two degree of freedom for the induction motor using the linear matrix inequality (LMI) based approach to linear parameter varying (LPV) systems which takes into account the nonlinear dynamics of the system We propose a two hierarchical control structure. The inner-loop current controller which...
Results of algebraic formulation for the global frequency stability bounds in the adjustable-speed induction motor drive are presented. The analysis is based on identifying system regenerative bounds with those of the self-excited generation mode. Under the condition, the speed limits will be determined by motor inherent capacity for own saturation while the associated steady-state oscillations within...
This article investigates how power electronic interfaces for loads provide reactive power in case of abnormal voltage conditions. An evaluation of voltage support is done for different values of voltage sags when the power electronic interface provides with reactive current. The stability margins of the distributed system are investigated for different types of loads and it is proved that the higher...
This paper presents stability analysis of a distributed generation (DG) controller, in an islanded mode, based on the Mapping Theorem and the Zero Exclusion Condition, and validates the results based on a laboratory scale experimental setup. The DG unit is interfaced to the host system through a voltage-sourced converter (VSC). The control strategy regulates the load voltage at the desired value in...
We have proposed a current observer-based induction motor speed sensorless vector control system which is composed in a rotating reference frame. The characteristic improvement of this system is discussed by taking into account iron loss, stator resistance identification, current low-pass filter and speed estimation low-pass filter. The stability of the system has been investigated by the trajectories...
This paper deals with the stability analysis of symmetrical induction motor. The symmetrical induction machine may become unstable over a range of frequencies even though the machine operates from a balanced, sinusoidal, zero impedance source. Small displacement equations valid for small excursions about an operating point are established from the machine equations expressed in synchronously rotating...
In this paper the IFOC open loop torque controller for induction motors is studied via linear approximations. Thanks to this study several important characteristics of IFOC are elucidated. Moreover, this analysis aids in the design of linear, robust and performance-based torque, speed or position controllers. A case study with real-time results is included.
In this paper, we will propose a nonlinear adaptive controller for a linear induction motor to achieve speed tracking. A nonlinear transformation is proposed to facilitate controller design. In this controller, only the primary currents are assumed to be measured. The secondary flux and speed observers are designed to relax the need offlux and speed measurement. Besides, the very unique end effect...
Natural field orientation (NFO) control technique was introduced and patented in 1980s as an alternative low cost control technique for induction motors. It offered some attractive features, including simplicity of control and low sensitivity to the stator resistance error. Some stability issues in regeneration have also been reported. This paper summarises the authors' experience with the NFO control...
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