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This paper presents a direct torque control drive system utilizing constant switching frequency controller (CSFC) with EKF based speed estimation. By employing CSFC instead of the conventional hysteresis controller, the torque ripple is reduced and constant switching frequency is achieved, and more importantly, the simple structure of DTC without any modification to the look-up table is maintained...
This paper proposes a sensorless sliding mode observer based model reference adaptive system applied to a direct torque control of the induction motor drive. The reference model is a sensorless sliding mode observer and the adaptive model is a typical current model. The proposed scheme provides speed and rotor flux estimations with the derivative of rotor flux set as the state of the adaptive mechanism...
This paper presents a dynamic hysteresis toque band strategy for improving flux regulation at low and zero speeds in a direct torque control (DTC)-look-up-table-based induction machine. The hysteresis torque band is controlled based on speed variation to solve the stator flux magnitude droops which normally occur at low frequency. The main benefit of the proposed approach is its simplicity, since...
This paper presents a new energy and power management control strategy for battery electric vehicle (BEV) with supercapacitors (SCs) based on speed command and acceleration estimation. The purpose of the control strategy is to increase the capability of regenerative braking energy capturing and to improve DC bus voltage regulation. The control strategy uses cascade voltage and current control of SCs...
A sensorless extended Kalman filter (EKF) based direct torque control (DTC) with the use of a constant switching frequency control (CSFC) of induction machine is proposed in this research work. This paper is meant to investigate the dynamic performance for DTC-CSFC and DTC with a hysteresis torque controller by applying different speed step changes from three different low speed operations. The dynamic...
Lithium titanate oxide is considered as the most promising anode material for lithium-ion battery owing to its fast charging capability. Its charging profile is essential to be modeled with a simple battery model for battery charger design. This paper develops a universal mathematical battery model which can be fitted to the charging profiles of different charging rates by using genetic algorithm...
This paper proposes a new control strategy and design for auxiliary power source using in Battery Hybrid Electric Vehicle (BHEV) based on acceleration power. The control strategy takes actual speed, acceleration and terminal voltage of supercapacitors (SCs) into account for controlling the energy and power demanded. The detail design of the auxiliary power source and its dynamic control are demonstrated...
This research discusses d-q model and Rotor Flux-Oriented Control (RFOC) technique for faulty three-phase Induction Motor (three-phase IM when one of the stator phases is opened). In the controlling technique, two transformation matrixes are applied to the equations of faulty three-phase IM. As a result, the equations of faulty three-phase IM become similar to the balanced IM. Therefore, by employing...
High-performance AC drives require accurate speed and torque estimations to provide a proper system operation. The selection and quality of extended Kaiman fitter (EKF) covariance elements have a considerable bearing on the effectiveness of motor drive. Many EKF-based optimization techniques involve only a single objective for the optimal estimation of speed without giving concern to the torque. This...
This paper presents a new approach of optimizing the performance of an Extended Kalman Filter (EKF) using particle swarm optimization (PSO) for speed estimation of an induction motor drive. The development of the EKF algorithm and selection of the filter covariance for the EKF based speed estimation are presented and discussed. The effectiveness of the optimization technique is verified through Matlab/Simulink...
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