Articles
<![CDATA[The direct power control of three-phase AC-DC converter under unbalance voltage condition ]]>
<![CDATA[Nor Azizah Yusoff]]>;
<![CDATA[Azziddin M. Razali]]>;
<![CDATA[Kasrul Abdul Karim]]>;
<![CDATA[Auzani Jidin]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 9, No 6: December 2019 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v9i6.pp5107-5114
<![CDATA[This paper has presents the integrated approach for three-phase PWM AC-DC converter for obtaining the symmetrical components under unbalanced supply condition. The input structures for conventional direct power control have been modified with three simpler sequence networks instead it coupled by a detailed three-phase system method. In the cases of an unbalanced three-phase system, it causes the presence of unbalanced current and voltages thus produce the negative components on the grid voltage. Otherwise, the unbalance voltage in a three-phase power system causes severe performance degradation of a grid-connected VSI. Therefore, the imbalance voltage can be resolved by separating from the individual elements of voltage and current into symmetrical components called as a sequencing network. Consequently, the input power is relatively improved during unbalanced condition. It proven through the measurement of Total Harmonic Distortion (THD) from the conventional direct power control in individual elements is much higher compared than it resolved in separate components. Therefore, three symmetrical components are necessary for imbalance supply condition to obtaining almost sinusoidal grid currents.]]>
<![CDATA[Analysis of direct power control AC-DC converter under unbalance voltage supply for steady-state and dynamic response ]]>
<![CDATA[Nor Azizah Mohd Yusoff]]>;
<![CDATA[Azziddin M. Razali]]>;
<![CDATA[Kasrul Abdul Karim]]>;
<![CDATA[Raja Nor Firdaus Kashfi Raja Othman]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Nor Aishah Md Zuki]]>;
<![CDATA[Nurfaezah Abdullah]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 10, No 4: August 2020 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v10i4.pp3333-3342
<![CDATA[This paper presents an analysis of Direct Power Control (DPC) technique for the Three-Phase Pulse Width Modulation (PWM) AC-DC converter under unbalanced supply condition. Unbalance condition will cause the presence of unbalanced current and voltages thus produce the negative components on the grid voltage as well as severe performance degradation of a grid connected Voltage Source Inverter (VSI). The input structures for conventional DPC has been modified with a three simpler sequence networks instead of coupled by a detailed Three-Phase system method. The imbalance voltage can be resolved by separating from the individual elements of voltage and current into symmetrical components called Sequence Network. Consequently, the input power relatively improved during unbalanced condition almost 70% through the measurement of Total Harmonic Distortion (THD) from the conventional Direct Power Control (DPC) in individual elements which is higher compared to separate components. Hence, several analyses are performed in order to analyze the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations.]]>
<![CDATA[An investigation of flux characteristic in direct torque control using sector rotation strategy ]]>
<![CDATA[Siti Azura A. Tarusan]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Mohd Luqman M. Jamil]]>;
<![CDATA[Kasrul Abdul Karim]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 12, No 4: December 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v12.i4.pp1978-1986
<![CDATA[Stator flux fails to regulate at low operating speed condition is a common drawback for the conventional direct torque control (DTC). It is due to the inevitable of zero-voltage vector demagnetization that interrupts the controlling of stator flux in DTC. Hence, a fixed sector rotation strategy is one of the solutions to rectify the raised issue. The strategy is based on the decreasing stator flux droop, which is an easy technique to change the sector of flux locus at a specific angle. However, this strategy only focuses at low operating speed. Thus, the stator flux droop effect at the various speed needs to be analysed. In this paper, an investigation is conducted by using simulation (MATLAB/Simulink) and experimental setup (dSPACE board) where a good agreement has been achieved between the predicted and measured results. The analysis taking into account between the conventional method (without strategy) and the proposed method (with strategy). In conclusion, the influence of stator flux droop is inversely proportional to the operating speed.]]>
<![CDATA[A new switching look-up table for direct power control of grid connected 3L-NPC PWM rectifier ]]>
<![CDATA[Azziddin M. Razali]]>;
<![CDATA[Nor Azizah Yusoff]]>;
<![CDATA[Kasrul Abdul Karim]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 12, No 3: September 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v12.i3.pp1413-1421
<![CDATA[This paper presents a comprehensive and systematic approach in developing a new switching look-up table for direct power control (DPC) strategy applied to the three-phase grid connected three-level neutral-point clamped (3L-NPC) pulse width modulated (PWM) rectifier. The term of PWM rectifier used in this paper is also known as AC-DC converter. The approach provides detailed information regarding the effects of each multilevel converter space vector to the distribution of input active and reactive power in the converter system. Thus, the most optimal converter space vectors are able to be selected by the switching look-up table, allowing smooth control of the active and reactive powers for each sector. In addition, the proposed DPC utilizes an NPC capacitor balanced strategy to enhance the performance of front-end AC-DC converter during load and supply voltage disturbances. The steady state as well as the dynamic performances of the proposed DPC are presented and analyzed by using MATLAB/Simulink software. The results show that the AC-DC converter utilizing the new look-up table is able to produce almost sinusoidal line currents with lower current total harmonic distortion, unity power factor operation, adjustable DC-link output voltage and good dynamic response during load disturbance.]]>
<![CDATA[Performance of three-phase three-wire cascaded H-bridge multilevel inverter-based shunt active power filter ]]>
<![CDATA[Musa Yusup Lada]]>;
<![CDATA[Mohd Amran Mohd Radzi]]>;
<![CDATA[Jasronita Jasni]]>;
<![CDATA[Hashim Hizam]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Syahrul Hisham Mohamad]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 11, No 3: September 2020 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v11.i3.pp1430-1440
<![CDATA[Multilevel inverter (MLI) becomes more significant in Active Power Filter (APF) application due to capability to its produce low harmonic output current in which at the same time improving performance of APF. Among the topologies of MLI, Cascaded H-Bridge (CHB) is the most popular topology with less power devices requirement and simple design. MLI CHB is also capable to produce possible output voltage at twice of the number of DC source which in this case of APF is the best suited topology to replace with the conventional six -step inverter. This paper presents the performance of three- phase three-wire CHB MLI used in Shunt Active Power Filter (SAPF) based on Direct Current Control (DCC) and Indirect Current Control (ICC) schemes. Both schemes are developed and verified in MATLAB/Simulink. The simulation results show that both current control algorithms are capable to mitigate load current with Total Harmonic Distortion below than the permissible value based on IEEE 519 standard.]]>
<![CDATA[Improved Torque Control Performance of Direct Torque Control for 5-Phase Induction Machine ]]>
<![CDATA[Logan Raj Lourdes Victor Raj]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Kasrul Abdul Karim]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[R. Sundram]]>;
<![CDATA[Mohd Hatta Jopri]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 3, No 4: December 2013 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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<![CDATA[In this paper, the control of five-phase induction machine using Direct Torque Control (DTC) is presented. The general D-Q model of five-phase induction machine is discussed. The de-coupled control of stator flux and electromagnetic torque based on hysteresis controller similar to conventional DTC is applied to maintain the simplicity of the system. Three sets of look-up tables consist of voltage vectors with different amplitude that selects the most optimal voltage vectors according motor operation condition is proposed. This provides excellent torque dynamic control, reduces torque ripple, lower switching frequency (high efficiency) and extension of constant torque. Simulation results validate the improvement achieved.DOI: http://dx.doi.org/10.11591/ijpeds.v3i4.5249]]>
<![CDATA[Proposed Voltage Vector to Optimize Efficiency of Direct Torque Control ]]>
<![CDATA[Goh Wee Yen]]>;
<![CDATA[Ali Monadi]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Tole Sutikno]]>
<![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[Compared to field-oriented control (FOC) system, direct torque control (DTC) system has gained attractiveness in control drive system because of its simpler control structure and faster dynamic control. However, supplying the drive system with rated flux at light load will decrease the power factor and efficiency of the system. Thus, an optimal flux has been applied during steady-state in order to maximize the efficiency of drive system. But when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded and it is not suitable for electric vehicle (EV) applications. Therefore, a modification to the voltage vector as well as look-up table has been proposed in order to improve the performance of torque response.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6918]]>
<![CDATA[Multi-carrier switching strategy for high-bandwidth potential balancing control of multilevel inverters ]]>
<![CDATA[Zuraidi Md Tahir]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Mohd Luqman Mohd Jamil]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 12, No 4: December 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v12.i4.pp2384-2392
<![CDATA[This paper confers on investigation of a direct torque control (DTC) of induction motor drive by 3 level neutral point clamp (NPC) multilevel inverter. The imbalance problem may deteriorate the electric drive performances which might cause a short circuit condition. Various balancing control strategies were proposed, however, most of them employed complex space vector modulation (SVM) and hysteresis-based controller that generates variable switching frequencies. The proposed method will offer a reliable balancing control strategy with a constant switching frequency, and moreover, it will provide excellent electric drive performances. This research proposed a new multi carrier switching modulation strategy that establish a high-band-width control for neutral point potential in the NPC inverter. Potency of the proposed high-bandwidth potential balancing strategy is validated through the MATLAB/SIMULINK environment.]]>
<![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[A Novel Dynamic Overmodulation Strategy of Direct Torque Control ]]>
<![CDATA[Auzani Jidin]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[Aiman Zakwan Jidin]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Abdul Halim Mohd Yatim]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 8, No 3: December 2010 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v8i3.629
<![CDATA[The direct torque control-space vector modulation (DTC-SVM) is well-known for achieving excellent dynamic overmodulation. However, the method uses complicated predictive stator flux vector control and requires high precision stator flux vector to define overmodulation mode. This paper proposes a straightforward dynamic overmodulation method and constant switching frequency controller without SVM to obtain a faster dynamic torque response in DTC for induction machines. To perform this method, the flux error status produced from the flux hysteresis comparator during dynamic condition is modified slightly before being fed to the look-up table. The verification of proposed method was performed using MATLAB/Simulink simulation package. The effects of different switching and operating condition on dynamic torque performance are analyzed. The result shows that a faster torque response is achieved in proposed dynamic overmodulation DTC method. The main benefit of the proposed method is its simplicity since only minor modification is made to the basic DTC hysteresis-based structure. ]]>
