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A Hybrid DTC-DSC Drive for High Performance Induction Motor Control
Jidin, Auzani,Idris, Nik Rumzi Nik,Yatim, Abdul Halim Mohamed,Sutikno, Tole,Elbuluk, Malik E. The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
This paper describes a hybrid induction motor drive system incorporating DTC-hysteresis and Direct Self Control (DSC) schemes to achieve excellent dynamic performance. The control scheme is switched from a circular to a hexagonal flux locus whenever a dynamic condition is encountered. On the other hand, when the motor operates under steady state conditions, a circular flux locus is used. Without major modifications to the simple structure of a basic DTC, hexagonal flux locus operation is established by modifying the flux error status, before it is fed to the look-up table. The feasibility of the proposed hybrid scheme to achieve excellent control performance is verified by experimental results.
A Hybrid DTC-DSC Drive for High Performance Induction Motor Control
Auzani Jidin,Nik Rumzi Nik Idris,Abdul Halim Mohamed Yatim,Tole Sutikno,Malik E. Elbuluk 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
This paper describes a hybrid induction motor drive system incorporating DTC-hysteresis and Direct Self Control (DSC) schemes to achieve excellent dynamic performance. The control scheme is switched from a circular to a hexagonal flux locus whenever a dynamic condition is encountered. On the other hand, when the motor operates under steady state conditions, a circular flux locus is used. Without major modifications to the simple structure of a basic DTC, hexagonal flux locus operation is established by modifying the flux error status, before it is fed to the look-up table. The feasibility of the proposed hybrid scheme to achieve excellent control performance is verified by experimental results.
Jannati, Mohammad,Idris, Nik Rumzi Nik,Aziz, Mohd Junaidi Abdul The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
A method for the fault-tolerant vector control of star-connected 3-phase Induction Motor (IM) drive systems based on Field-Oriented Control (FOC) is proposed in this paper. This method enables the control of a 3-phase IM in the presence of an open-phase failure in one of its phases without the need for control structure changes to the conventional FOC algorithm. The proposed drive system significantly reduces the speed and torque pulsations caused by an open-phase fault in the stator windings. The performance of the proposed method was verified using MATLAB (M-File) simulation as well experimental tests on a 1.5kW 3-phase IM drive system. This paper experimentally compares the operation of the proposed fault-tolerant vector controller and a conventional vector controller during open-phase fault.
Jidin, Auzani,Idris, Nik Rumzi Nik,Yatim, Abdul Halim Mohd,Sutikno, Tole,Elbuluk, Malik E. The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.2
Direct torque control(DTC) 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, a variable inverter switching frequency and a high torque ripple. These problems occur due to the use of hysteresis comparators in conventional DTC schemes, particularly in controlling the output torque. This paper reviews the utilization of constant frequency torque controllers (CFTC) in DTC to solve these problems while retaining the simple control structure of DTC. Some extensions of the work in utilizing a CFTC will be carried out in this paper which can further reduce the torque ripple. This is particularly useful for a system which has a limited/low sampling frequency. The feasibility of a CFTC with an extended carrier frequency in minimizing the torque ripple is verified through experimental results.
Mohammad Jannati,Nik Rumzi Nik Idris,Mohd Junaidi Abdul Aziz 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
A method for the fault-tolerant vector control of star-connected 3-phase Induction Motor (IM) drive systems based on Field-Oriented Control (FOC) is proposed in this paper. This method enables the control of a 3-phase IM in the presence of an open-phase failure in one of its phases without the need for control structure changes to the conventional FOC algorithm. The proposed drive system significantly reduces the speed and torque pulsations caused by an open-phase fault in the stator windings. The performance of the proposed method was verified using MATLAB (M-File) simulation as well experimental tests on a 1.5kW 3-phase IM drive system. This paper experimentally compares the operation of the proposed fault-tolerant vector controller and a conventional vector controller during open-phase fault.
Auzani Jidin,Nik Rumzi Nik Idris,Abdul Halim Mohd Yatim,Tole Sutikno,Malik E. Elbuluk 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.2
Direct torque control (DTC) 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, a variable inverter switching frequency and a high torque ripple. These problems occur due to the use of hysteresis comparators in conventional DTC schemes, particularly in controlling the output torque. This paper reviews the utilization of constant frequency torque controllers (CFTC) in DTC to solve these problems while retaining the simple control structure of DTC. Some extensions of the work in utilizing a CFTC will be carried out in this paper which can further reduce the torque ripple. This is particularly useful for a system which has a limited/low sampling frequency. The feasibility of a CFTC with an extended carrier frequency in minimizing the torque ripple is verified through experimental results.
Alsofyani, Ibrahim Mohd,Idris, Nik Rumzi Nik,Lee, Kyo-Beum Institute of Electrical and Electronics Engineers 2018 IEEE transactions on power electronics Vol.33 No.9
<P>The magnitude of hysteresis torque band has a considerable effect on the performance of two-level direct torque control (DTC) of induction machines. The conventional DTC fails at low speed due to the poor flux regulation. In this paper, two dynamic hysteresis torque band (DHTB) strategies for the conventional DTC are proposed to solve this problem by dynamically altering the amplitude of hysteresis torque band based on a flux error range. In this way, the simplicity of DTC algorithm is retained since it only requires a minor modification on its structure. The paper also presents further analysis on flux degradation, particularly the droop in between the flux sectors. In addition, the switching frequency effect of reverse voltage vectors for both DHTB schemes is investigated on the performance of the speed-sensorless DTC drive. The effectiveness of the proposed schemes is confirmed by simulation and experimental validation. Results show a significant enhancement in the flux regulation and dynamic torque response from zero motor speed.</P>
Ibrahim Mohd Alsofyani,Nik Rumzi Nik Idris,이교범 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1
It is well known that the selection of extended Kalman filter (EKF) covariance elements has a considerable bearing on the effectiveness of EKF performance. The observability at very low frequency is also an essential property for the selection of EKF elements. This paper investigates the optimization of the EKF covariance elements when zero frequency is included in the training profile for direct torque control (DTC) of induction motor. In addition, the paper studies the optimization of EKF by speed and torque fitness functions using a non-dominated sorting genetic algorithm-II at zero and high speeds under stable flux regulation. For this purpose, DTC with constant switching frequency controller which has the capability of establishing continuous flux rotation regardless of speed variation is used. The optimized results of EKF for both DTC motor drives and speed and torque cost functions are verified experimentally.
Wen Yao Low,Mohd Junaidi Abdul Aziz,Nik Rumzi Nik Idris,Nor Akmal Rai 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.10
The extended Kalman filter (EKF) has been widely used to estimate the state-of-charge (SoC) of batteries over the past decade. Battery SoC estimation with the EKF is initialized without knowing the true value of the SoC. Thus, it requires a fast convergence rate to provide users with an accurate SoC value in the shortest time. Applying an adaptive rule into the EKF is an unfussy way to improve both the accuracy and convergence rate of SoC estimation. However, an adaptive rule requires additional calculations and consumes additional memory space to store the learning history. This paper applies Busse’s adaptive rule to improve the accuracy and convergence rate of EKF battery SoC estimation. Experimental data from a lithium titanate battery is applied to examine the battery SoC estimation with EKF, covariance-matching adaptive EKF (CM-AEKF), and Busse’s adaptive EKF (Busse-AEKF) algorithms. The findings showed that the Busse-AEKF method has the shortest convergence time with an accuracy that is comparable to that of the CM-AEKF method. After the SoC value is converged, the algorithm gives estimation accuracy of a 1.42% root-mean-square error (RMSE) and a 3.15% of maximum error. In addition, Busse’s AEKF does not require a large memory space to operate. Thus, it is a promising solution for battery SoC estimation.