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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...
This paper presents an improved FPGA-based torque and stator flux estimators for direct torque control (DTC) induction motor drives, which permit very fast calculations. The improvements are performed by 1) using two's complement fixed-point format approach to minimize calculation errors and the hardware resources usage in all operations, 2) calculating the discrete integration operation of stator...
This paper presents a simple dynamic overmodulation method to obtain a fast dynamic torque response in DTC of induction machines with constant switching frequency controller. A fast dynamic torque response can be obtained by switching only the most optimized voltage vector during torque dynamic condition. The optimized voltage vector can be identified by comparing the rate of change of torque produced...
This paper presents a simple overmodulation strategy to achieve high torque capability for a wide speed range using a hybrid DTC scheme. The hybrid DTC drive incorporates both DTC-hysteresis and Direct Self Control (DSC) operations. In the proposed method, the control of circular flux locus is changed to the hexagonal when the motor operates under acceleration condition. By controlling the locus flux...
Direct Torque Control of induction machines is known to offer fast instantaneous torque and flux control with a simple control structure. However, this scheme has two major disadvantageous namely variable inverter switching frequency and high torque ripple. These problems occur due to the use of hysteresis comparators in the conventional DTC scheme, particularly in controlling the output torque. This...
This paper presents a simple dynamic overmodulation method to obtain a quick dynamic torque response in Direct Torque Control with constant switching frequency (will be referred as DTC-CSF) induction machines. A fast dynamic torque control can be achieved by applying a voltage vector that produces the largest tangential flux component during the transient condition. To perform this, the flux error...
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