Articles
<![CDATA[High Performance Speed Control of Single-Phase Induction Motors Using Switching Forward and Backward EKF Strategy ]]>
<![CDATA[Mohammad Jannati]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Mohd Junaidi Abdul Aziz]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 7, No 1: March 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v7.i1.pp17-27
<![CDATA[The aim of this research is to provide a high performance vector control of single-phase Induction Motor (IM) drives. It is shown that in the rotating reference frame, the single-phase IM equations can be separated into forward and backward equations with the balanced structure. Based on this, a method for vector control of the single-phase IM, using two modified Rotor Field-Oriented Control (RFOC) algorithms is presented. In order to accommodate forward and backward rotor fluxes in the presented controller, an Extended Kalman Filter (EKF) with two different forward and backward currents that are switched interchangeably (switching forward and backward EKF), is proposed. Simulation results illustrate the effectiveness of the proposed algorithm.]]>
<![CDATA[Speed Sensorless Vector Control of Unbalanced Three-Phase Induction Motor with Adaptive Sliding Mode Control ]]>
<![CDATA[Mohammad Jannati]]>;
<![CDATA[Ali Monadi]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Mohd Junaidi Abdul Aziz]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 4, No 3: September 2014 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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<![CDATA[This paper presents a technique for speed sensorless Rotor Flux Oriented Control (RFOC) of 3-phase Induction Motor (IM) under open-phase fault (unbalanced or faulty IM). The presented RFOC strategy is based on rotational transformation. An adaptive sliding mode control system with an adaptive switching gain is proposed instead of the speed PI controller. Using an adaptive sliding mode control causes the proposed speed sensorless RFOC drive system to become insensitive to uncertainties such as load disturbances and parameter variations. Moreover, with adaptation of the sliding switching gain, calculation of the system uncertainties upper bound is not needed. Finally, simulation results have been presented to confirm the good performance of the proposed method.DOI: http://dx.doi.org/10.11591/ijpeds.v4i3.6212]]>
<![CDATA[Improved Stator Flux Estimation for Direct Torque Control of Induction Motor Drives ]]>
<![CDATA[Yahya Ahmed Alamri]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Ibrahim Mohd. Alsofyani]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 7, No 4: December 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v7.i4.pp1049-1060
<![CDATA[Stator flux estimation using voltage model is basically the integration of the induced stator back electromotive force (emf) signal. In practical implementation the pure integration is replaced by a low pass filter to avoid the DC drift and saturation problems at the integrator output because of the initial condition error and the inevitable DC components in the back emf signal. However, the low pass filter introduces errors in the estimated stator flux which are significant at frequencies near or lower than the cutoff frequency. Also the DC components in the back emf signal are amplified at the low pass filter output by a factor equals to . Therefore, different integration algorithms have been proposed to improve the stator flux estimation at steady state and transient conditions. In this paper a new algorithm for stator flux estimation is proposed for direct torque control (DTC) of induction motor drives. The proposed algorithm is composed of a second order high pass filter and an integrator which can effectively eliminates the effect of the error initial condition and the DC components. The amplitude and phase errors compensation algorithm is selected such that the steady state frequency response amplitude and phase angle are equivalent to that of the pure integrator and the multiplication and division by stator frequency are avoided. Also the cutoff frequency selection is improved; even small value can filter out the DC components in the back emf signal. The simulation results show the improved performance of the induction motor direct torque control drive with the proposed stator flux estimation algorithm. The simulation results are verified by the experimental results.]]>
<![CDATA[Modified Look-Up Table for Enhancement of Torque Response in Direct Torque Controlled Induction Machine ]]>
<![CDATA[Goh Wee Yen]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 8, No 2: June 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v8.i2.pp522-533
<![CDATA[Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.]]>
<![CDATA[Novel Method of FOC to Speed Control in Three-Phase IM under Normal and Faulty Conditions ]]>
<![CDATA[Mohammad Jannati]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Mohd Junaidi Abdul Aziz]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 6, No 4: December 2015 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v6.i4.pp831-841
<![CDATA[This paper proposes a novel method for speed control of three-phase Induction Motor (IM) which can be used for both healthy three-phase IM and three-phase IM under open-phase fault. The proposed fault-tolerant control system is derived from conventional Field-Oriented Control (FOC) algorithm with minor changes on it. The presented drive system is based on using an appropriate transformation matrix for the stator current variables. The presented method in this paper can be also used for speed control of single-phase IMs with two windings. The feasibility of the proposed strategy is verified by simulation results.]]>
<![CDATA[Speed Sensorless Direct Rotor Field-Oriented Control of Single-Phase Induction Motor Using Extended Kalman Filter ]]>
<![CDATA[Mohammad Jannati]]>;
<![CDATA[Seyed Hesam Asgari]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Mohd Junaidi Abdul Aziz]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 4, No 4: December 2014 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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<![CDATA[Nowadays, Field-Oriented Control (FOC) strategies broadly used as a vector based controller for Single-Phase Induction Motors (SPIMs). This paper is focused on Direct Rotor FOC (DRFOC) of SPIM. In the proposed technique, transformation matrices are applied in order to control the motor by converting the unbalanced SPIM equations to the balanced equations (in this paper the SPIM with two different stator windings is considered). Besides this control technique, a method for speed estimation of SPIM based on Extended Kalman Filter (EKF) to achieve the higher performance of SPIM drive system is presented. Simulation results are provided to demonstrate the high performance of the presented techniques.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6098]]>
<![CDATA[A Novel Method for IRFOC of Three-Phase Induction Motor under Open-Phase Fault ]]>
<![CDATA[Mohammad Jannati]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Mohd Junaidi Abdul Aziz]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 6, No 3: September 2015 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v6.i3.pp439-448
<![CDATA[This paper investigates the vector control of a star-connected three-phase Induction Motor (IM) under stator winding open-phase fault. The used vector control method is based upon indirect rotor field-orientation concepts that have been adapted for this type of machine. Beside the implementation of this method in critical industrial applications, the proposed method in this paper can be used for vector control of unbalanced 2-phase or single-phase IM with two main and auxiliary windings. Simulation results are provided to show the operation of the proposed drive system.]]>
<![CDATA[FPGA Based a PWM Technique for Permanent Magnet AC Motor Drives ]]>
<![CDATA[Tole Sutikno]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Nuryono Satya Widodo]]>;
<![CDATA[Auzani Jidin]]>
<![CDATA[ International Journal of Reconfigurable and Embedded Systems (IJRES) Vol 1, No 2: July 2012 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijres.v1.i2.pp43-48
<![CDATA[The permanent magnet AC motor trapezoidal (BLDC motor) is not strictly DC motor, which uses a pulsed DC fed to the stator field windings to create a rotating magnetic field. Therefore, the motor needs an electronic commutation to provide the rotating field. A pair of switches must be turned on sequentially in the correct order to energize a pair of windings. If the incorrect order is applied, then the BLDC motor will not operate properly. This paper presents a smart guideline to ensure that the order to energize a pair of windings is correct. To ensure the guideline, FPGA based a simple commutation state machine scheme to control BLDC motor is presented. The experiment results have shown that the guideline is correct. The commutation scheme was successfully realized using Altera's APEX20KE FPGA to control BLDC motor in both of forward/reverse rotations or forward/reverse regenerative braking properly.]]>
<![CDATA[Improved Output Voltage Quality using Space Vector Modulation for Multilevel Inverters ]]>
<![CDATA[Auzani Jidin]]>;
<![CDATA[Syamim Sanusi]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[Nik Rumzi Nik Idris]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 14, No 2: June 2016 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v14i2.3111
<![CDATA[Space vector modulation (SVM) has received wide acceptance due to many benefits over other techniques such as higher output voltages, lower total harmonic distortion (THD), high-efficiency and flexible to be implemented in vector control systems. In digital implementation, the SVM equations can be optimally computed by eliminate the use of complex forms. In this paper, the simple SVM based on two-level inverter is employed for higher levels of inverters. This is to retain the simplicity of SVM computation for three-level and five-level cascaded H-bridge multilevel inverter (CHMI). Moreover, the proposed method utilizes two controller boards to perform high computational workloads and to eliminate glitch and error problems. Experiment results show that the THD of output voltage in five-level CHMI gives the smallest value among the results obtained from other levels.]]>
<![CDATA[Direct Torque Control: Stator Flux Regulation Improvement at Low Speed ]]>
<![CDATA[Nik Rumzi Nik Idris]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 1: March 2017 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v15i1.5419
<![CDATA[A simple method to improve stator flux regulation of a direct torque control (DTC) of induction motor drive is presented. By using this method, the simple control structure of DTC is retained and no modification to the voltage vectors look-up table is required. To implement this technique, the index to the look-up table is modified so that the reverse voltage vectors are selected (instead of zero-voltage vectors) whenever the stator flux regulation fails. To study the viability and the effectiveness of this simple method in improving the flux regulation at low speed, experiments are conducted to a ¼ hp induction motor with DTC technique. The control algorithm is implemented using a DS1104 controller board with Xilinx FPGA. ]]>
