Articles
            
            
            
            
            
                            
                    
                        Speed Control of 3-phase Induction Motors under Fault Conditions Supplied by Wind Turbine Using Indirect Vector Control 
                    
                    Mohammad Jannati; 
Solieman Eskandari; 
Tole Sutikno                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 8, No 1: March 2017 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v8.i1.pp222-230                            
                                            
                    
                        
                            
                            
                                
This article studies speed control of 3-phase Induction Motors (IMs) under fault conditions supplied by wind turbine using Indirect Vector Control (IVC). The wind turbine plays as a prime mover to a connected DC generator. Pulse Width Modulation (PWM) is used to obtain 3-phase AC voltage from the DC generator output. The proposed modified controller is able to control a star-connected 3-phase IM under normal, stator winding open-circuit fault and speed-sensor fault conditions. Simulation results are presented and shown the performance, validity and possibility of the proposed technique. The results demonstrate that, the proposed scheme provides good dynamic performance especially in reduction of IM speed and torque pulsations.
                            
                         
                     
                 
                
                            
                    
                        Modified Look-Up Table for Enhancement of Torque Response in Direct Torque Controlled Induction Machine 
                    
                    Goh Wee Yen; 
Nik Rumzi Nik Idris; 
Auzani Jidin; 
Tole Sutikno                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 8, No 2: June 2017 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v8.i2.pp522-533                            
                                            
                    
                        
                            
                            
                                
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.
                            
                         
                     
                 
                
                            
                    
                        Application of inductive coupling for wireless power transfer 
                    
                    Ibrahim Alhamrouni; 
M. Iskandar; 
Mohamed Salem; 
Lilik J. Awalin; 
Awang Jusoh; 
Tole Sutikno                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 11, No 3: September 2020 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v11.i3.pp1109-1116                            
                                            
                    
                        
                            
                            
                                
Considering the massive development that took place in the past two decades, wireless power transfer has yet to show the applicability to be used due to several factors. This work focuses on determining the main parameters like, mutual inductance, and coupling coefficient for a pair of helical coils for wireless power transfer applications. These parameters are important in designing and analyzing a wireless power transfer system based on the phenomenon of inductive/ resonant inductive coupling. Here presents a simple approach based on fundamental laws of physics for determining the coupled coil parameters for single layered helical coils. The results conducted by computer simulation which is MATLAB. Furthermore, this analysis is used to study the effect of change in coil diameter, mutual inductance coefficient and change in distance between coils on parameters like self and mutual inductance of coupled coils which is of great importance in Wireless Power Transfer applications. The research yielded promising results to show that wireless power transfer has huge possibility to solve many existing industrial problems.
                            
                         
                     
                 
                
                            
                    
                        Novel Method of FOC to Speed Control in Three-Phase IM under Normal and Faulty Conditions 
                    
                    Mohammad Jannati; 
Tole Sutikno; 
Nik Rumzi Nik Idris; 
Mohd Junaidi Abdul Aziz                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 6, No 4: December 2015 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v6.i4.pp831-841                            
                                            
                    
                        
                            
                            
                                
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.
                            
                         
                     
                 
                
                            
                    
                        Lithium ferro phosphate battery state of charge estimation using particle filter 
                    
                    Noor Iswaniza Md Siam; 
Tole Sutikno; 
Mohd Junaidi Abdul Aziz                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 12, No 2: June 2021 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v12.i2.pp975-985                            
                                            
                    
                        
                            
                            
                                
Lithium ferro phosphate (LiFePO4) has a promising battery technology with high charging/discharging behaviours make it suitable for electric vehicles (EVs) application. Battery state of charge (SOC) is a vital indicator in the battery management system (BMS) that monitors the charging and discharging operation of a battery pack. This paper proposes an electric circuit model for LiFePO4 battery by using particle filter (PF) method to determine the SOC estimation of batteries precisely. The LiFePO4 battery modelling is carried out using MATLAB software. Constant discharge test (CDT) is performed to measure the usable capacity of the battery and pulse discharge test (PDT) is used to determine the battery model parameters. Three parallel RC battery models have been chosen for this study to achieve high accuracy. The proposed PF implements recursive bayesian filter by Monte Carlo sampling which is robust for non-linear and/or non-Gaussian distributions. The accuracy of the developed electrical battery model is compared with experimental data for verification purpose. Then, the performance of the model is compared with experimental data and extended Kalman filter (EKF) method for validation purposed. A superior battery SOC estimator with higher accuracy compared to EKF method has been obtained.
                            
                         
                     
                 
                
                            
                    
                        A Novel Method for IRFOC of Three-Phase Induction Motor under Open-Phase Fault 
                    
                    Mohammad Jannati; 
Tole Sutikno; 
Nik Rumzi Nik Idris; 
Mohd Junaidi Abdul Aziz                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 6, No 3: September 2015 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v6.i3.pp439-448                            
                                            
                    
                        
                            
                            
                                
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.
                            
                         
                     
                 
                
                            
                    
                        Design and Analysis of In-Wheel Double Stator Slotted Rotor BLDC Motor for Electric Bicycle Application 
                    
                    S. Farina; 
R.N. Firdaus; 
F. Azhar; 
M. Azri; 
M. S. Ahmad; 
R. Suhairi; 
A. Jidin; 
Tole Sutikno                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 9, No 1: March 2018 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v9.i1.pp457-464                            
                                            
                    
                        
                            
                            
                                
This paper discusses about design and analysis of double stator slotted rotor (DSSR) BLDC motor for electric bicycle application. Usually single stator (SS) BLDC motor is used in an electric bicycle. This type of motor has low performance and need to be charged regularly. The objective of this research is to design and analysis DSSR motor that have high torque. At starts, design specification for the electric bicycle is calculated. Next, design process for DSSR is carried out by using the desired parameter. Lastly, analysis for double stator slotted rotor is simulated using FEM. Result  for average back emf, average inductance, inner stator flux density, outer stator flux density, average torque and estimate torque constant is obtained. Result for average torque from FEM archieve the requirement of motor torque for DSSR design where the maximum average torque is 16.2 Nm. This research will give benefit to mankind and society in term of environment protection and energy consumption.
                            
                         
                     
                 
                
                            
                    
                        An analysis of voltage source inverter switches fault classification using short time Fourier transform 
                    
                    Mustafa Manap; 
Srete Nikolovski; 
Aleksandr Skamyin; 
Rony Karim; 
Tole Sutikno; 
Mohd Hatta Jopri                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 12, No 4: December 2021 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v12.i4.pp2209-2220                            
                                            
                    
                        
                            
                            
                                
The dependability of power electronics systems, such as three-phase inverters, is critical in a variety of applications. Different types of failures that occur in an inverter circuit might affect system operation and raise the entire cost of the manufacturing process. As a result, detecting and identifying inverter problems for such devices is critical in industry. This study presents the short-time Fourier transform (STFT) for fault classification and identification in three-phase type, voltage source inverter (VSI) switches. TFR represents the signal analysis of STFT, which includes total harmonic distortion, instantaneous RMS current, RMS fundamental current, total non harmonic distortion, total waveform distortion and average current. The features of the faults are used with a rule-based classifier based on the signal parameters to categorise and detect the switch faults. The suggested method's performance is evaluated using 60 signals containing short and open circuit faults with varying characteristics for each switch in VSI. The classification results demonstrate the proposed technique is good to be implemented for VSI switches faults classification, with an accuracy classification rate of 98.3 percent.
                            
                         
                     
                 
                
                            
                    
                        An Analysis of Virtual Flux Direct Power Control of Three-Phase AC-DC Converter 
                    
                    Nor Azizah Mohd Yusoff; 
Azziddin M. Razali; 
Kasrul Abdul Karim; 
Auzani Jidin; 
Tole Sutikno                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 9, No 3: September 2018 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v9.i3.pp947-956                            
                                            
                    
                        
                            
                            
                                
This paper presents an analysis of virtual-flux direct power control (VFDPC) technique for the three-phase pulse width modulation (PWM) ac-dc converter. The proposed VFDPC is developed by assuming the grid voltage and converter line filters quantities are related to a virtual three-phase ac motor. The controller works with less number of sensors by eliminating the voltage sensors used for measuring the three-phase grid voltage. The grid virtual flux which is proportional to the grid voltage will be estimated from the information of converter switching states, line current, and dc-link output voltage. Several analyses are performed in order to study the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations. The proportional integral (PI) controller at the outer voltage control loop of VFDPC is tuned properly and the entire PWM ac-dc converter system is simulated using MATLAB/Simulink to ensure the dc output voltage follow the desired output voltage under steady state and dynamic conditions. Ac-dc converter utilizing the proposed VFDPC is able to generate three-phase input current waveforms that are almost sinusoidal with low harmonics contents which is less than 5% and near unity power factor (pf) operation.
                            
                         
                     
                 
                
                            
                    
                        Reduction of total harmonic distortion of three-phase inverter using alternate switching strategy 
                    
                    Nur Arifah Ramli; 
Auzani Jidin; 
Zulhani Rasin; 
Tole Sutikno                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 12, No 3: September 2021 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v12.i3.pp1598-1608                            
                                            
                    
                        
                            
                            
                                
Alternating current (AC) electrical drives mainly require smaller current (or torque) ripples and lower total harmonic distortion (THD) of voltage for excellent drive performances. Normally, in practice, to achieve these requirements, the inverter needs to be operated at high switching frequency. By operating at high switching frequency, the size of filter can be reduced. However, the inverter which oftenly employs insulated gate bipolar transistor (IGBT) for high power applications cannot be operated at high switching frequency. This is because, the IGBT switching frequency cannot be operated above 50 kHz due to its thermal restrictions. This paper proposes an alternate switching strategy to enable the use of IGBT for operating the inverter at high switching frequency to improve THD performances. In this strategy, each IGBT in a group of switches in the modified inverter circuit will operate the switching frequency at one-fourth of the inverter switching frequency. The alternate switching is implemented using simple analog and digital integrated circuits.