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                        Periodic Perturbation Method for Controlling Chaos for a Positive Output DC-DC Luo Converter 
                    
                    P. Balamurugan; 
A. Kavitha; 
P. Sanjeevikumar; 
J.L. Febin Daya; 
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.pp775-784                            
                                            
                    
                        
                            
                            
                                
A simple, non-feedback method of controlling chaos is implemented for a DC-DC converter. The weak periodic perturbation (WPP) is the control technique applied to stabilize an unstable orbit in a current-mode controlled Positive Output Luo (POL) DC-DC converter operating in a chaotic regime. With WPP, the operation of the converter is limited to stable period-1 orbit that exists in the original chaotic attractor. The proposed control strategy is implemented using simulations and the results are verified with hardware setup. The experimental results of the converter with WPP control are presented which shows the effectiveness of the control strategy.
                            
                         
                     
                 
                
                            
                    
                        A new switching look-up table for direct power control of grid connected 3L-NPC PWM rectifier 
                    
                    Azziddin M. Razali; 
Nor Azizah Yusoff; 
Kasrul Abdul Karim; 
Auzani Jidin; 
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.pp1413-1421                            
                                            
                    
                        
                            
                            
                                
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.
                            
                         
                     
                 
                
                            
                    
                        Optimal extraction of photovoltaic energy using fuzzy logic control for maximum power point tracking technique 
                    
                    Kadhim Hamzah Chalok; 
Mohammad Faridun Naim Tajuddin; 
Thanikanti Sudhakar Babu; 
Shahrin Md Ayob; 
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.pp1628-1639                            
                                            
                    
                        
                            
                            
                                
In photovoltaic (PV) systems, maximum power point tracking (MPPT) techniques are used to track the maximum power from the PV array under the change in irradiance and temperature conditions. The perturb and observe (P&O) is one of the most widely used MPPT techniques in recent times due to its simple implementation and improved performance. However, the P&O has limitations such as oscillation around the MPP during which time the P&O algorithm will become confused due to rapidly changing atmospheric conditions. To overcome the above limitation, this paper uses the fuzzy logic controller (FLC) to track the maximum power from the PV system under different irradiance, integrates it with a DC-DC boost converter as a tracker. The result of the FLC performance is compared with the traditional P&O method and shows the MPPT algorithm based on FLC ensures continuous tracking of the maximum power within a short period compared with the traditional P&O method. Besides that, the proposed method (FLC) has a faster dynamic response and low oscillations at the operating point around the MPP under steady-state conditions and dynamic change in irradiance.
                            
                         
                     
                 
                
                            
                    
                        Constant Frequency Torque Controller for DTC with Multilevel Inverter of Induction Machines 
                    
                    Norjulia Mohamad Nordin; 
Naziha Ahmad Azli; 
Nik Rumzi Nik Idris; 
Nur Huda Ramlan; 
Tole Sutikno                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 7, No 1: March 2016 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v7.i1.pp28-44                            
                                            
                    
                        
                            
                            
                                
Direct Torque Control using multilevel inverter (DTC-MLI) with hysteresis controller suffers from high torque and flux ripple and variable switching frequency. In this paper, a constant frequency torque controller is proposed to enhance the DTC-MLI performance. The operational concepts of the constant switching frequency torque controller of a DTC-MLI system followed by the simulation results and analysis are presented. The proposed system significantly improves the DTC drive in terms of dynamic performance, smaller torque and flux ripple, and retain a constant switching frequency.
                            
                         
                     
                 
                
                            
                    
                        Improvement of the performance of STATCOM in terms of voltage profile using ANN controller 
                    
                    Mohammed Salheen Alatshan; 
Ibrahim Alhamrouni; 
Tole Sutikno; 
Awang Jusoh                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 11, No 4: December 2020 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v11.i4.pp1966-1978                            
                                            
                    
                        
                            
                            
                                
The electronic equipments are extremely sensitive to variation in electric supply. The increasing of a nonlinear system with several interconnected unpredicted and non-linear loads are causing some problems to the power system. The major problem facing the power system is power quality, controlling of reactive power and voltage drop. A static synchronous compensator (STATCOM) is an important device commonly used for compensation purposes, it can provide reactive support to a bus to compensate voltage level. In this paper, the Artificial Neural Network (ANN) controlled STATCOM has been designed to replace the conventional PI controller to enhance the STATCOM performance. The ANN controller is proposed due to its simple structure, adaptability, robustness, considering the power grid non linearities. The ANN is trained offline using data from the PI controller. The performance of STATCOM with case of Load increasing and three-phase faults case was analyzed using MATLAB/Simulink software on the IEEE 14-bus system. The comprehensive result of the PI and ANN controllers has demonstrated the effectiveness of the proposed ANN controller in enhancing the STATCOM performance for Voltage profile at different operating conditions. Furthermore, it has produced better results than the conventional PI controller.
                            
                         
                     
                 
                
                            
                    
                        Implementation of Space Vector Modulator for Cascaded H-Bridge Multilevel Inverters 
                    
                    Syamim Sanusi; 
Auzani Jidin; 
Tole Sutikno; 
Kasrul Abdul Karim; 
Mohd Luqman Jamil; 
Siti Azura Ahmad Tarusan                    
                     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.pp906-918                            
                                            
                    
                        
                            
                            
                                
The Space Vector Modulation (SVM) technique has gained wide acceptance for many AC drive applications, due to a higher DC bus voltage utilization (higher output voltage when compared with the SPWM), lower harmonic distortions and easy digital realization. In recent years, the SVM technique was extensively adopted in multilevel inverters since it offers greater numbers of switching vectors for obtaining further improvements of AC drive performances. However, the use of multilevel inverters associated with SVM increases the complexity of control algorithm (or computational burden), in obtaining proper switching sequences and vectors. The complexity of SVM computation causes a microcontroller or digital signal processor (DSP) to execute the computation at a larger sampling time. This consequently may produce errors in computation and hence degrades the control performances of AC motor drives. This paper presents a developement of SVM modulator for three-level Cascaded H-Bridge Multilevel Inverter (CHMI) using a hybrid controller approach, i.e. with combination between the DS1104 Controller Board and FPGA. In such way, the computational burden can be minimized as the SVM tasks are distributed into two parts, in which every part is executed by a single controller. This allows the generation of switching gates performed by FPGA at the minimum sampling time 〖DT〗_2=540 ns to obtain precise desired output voltages, as can be verified via simulation and experimental results.
                            
                         
                     
                 
                
                            
                    
                        Bearingless Permanent Magnet Synchronous Motor using Independent Control 
                    
                    Normaisharah Mamat; 
Kasrul Abdul Karim; 
Zulkiflie Ibrahim; 
Tole Sutikno; 
Siti Azura Ahmad Tarusan; 
Auzani Jidin                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 6, No 2: June 2015 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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                                DOI: 10.11591/ijpeds.v6.i2.pp233-241                            
                                            
                    
                        
                            
                            
                                
Bearingless permanent magnet synchronous motor (BPMSM) combines the characteristic of the conventional permanent magent synchronous motor and magnetic bearing in one electric motor. BPMSM is a kind of high performance motor due to having both advantages of PMSM and magnetic bearing with simple structure, high efficiency, and reasonable cost. The research on BPMSM is to design and analyse BPMSM by using Maxwell 2-Dimensional of ANSYS Finite Element Method (FEM). Independent suspension force model and bearingless PMSM model are developed by using the method of suspension force. Then, the mathematical model of electromagnetic torque and radial suspension force has been developed by using Matlab/Simulink. The relation between force, current, distance and other parameter are determined. This research covered the principle of suspension force, the mathematical model, FEM analysis and digital control system of bearingless PMSM. This kind of motor is widely used in high speed application such as compressors, pumps and turbines.
                            
                         
                     
                 
                
                            
                    
                        Electromagnetic Performance due to Tooth-tip Design in Fractional-slot PM Brushless Machines 
                    
                    Mohd Luqman Mohd Jamil; 
Zulfikri Zaki Zolkapli; 
Auzani Jidin; 
Raja Nor Firdaus Raja Othman; 
Tole Sutikno                    
                     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.pp860-868                            
                                            
                    
                        
                            
                            
                                
Permanent Magnet (PM) machines are favorable as an alternative to other machine topologies due to simpler construction and high torque density. However, it may result hight torque ripple due to an influence of cogging torque and electronic commutation. In this paper, comparisons of phase back-emf, static torque and cogging torque due to influence of tooth-tip asymmetry in 12-slot/10-pole double-layer and 12-slot/10-pole single layer winding machines are carried out using 2D Finite-Element Analysis. At rated condition, the stator asymmetry has great influence on the torque performance as there is significant reduction of torque ripple in 12-slot/10-pole mahine equipped with single layer winding than one equipped with double layer winding machine. It si confirmed that an optimum torque performance is desirable via stator iron modification in PM machines.
                            
                         
                     
                 
                
                            
                    
                        The Application of FPGA in PWM Controlled Resonant Converter for an Ozone Generator 
                    
                    Mochammad Facta; 
Tole Sutikno; 
Zainal Salam                    
                     International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 3, No 3: September 2013 
                    
                    Publisher : Institute of Advanced Engineering and Science 
                    
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Pulse Width Modulation (PWM) is a very common technique used in many different applications. The Conventional method its generation is the heart of the inverter system. This paper present methodology to generate Sinusoidal PWM (SPWM) signal for three-phase inverter based on EP20K200EFC484-2x Altera Field Programmable Gate Array (FPGA). Designing a PWM inverter drive using FPGA has several advantages, such as: it's quick, very modifiable, and very suitable for prototyping. In this paper, the PWM signal is used control switching action conducted by MOSFET as part of power electronics devices in resonant power converter which has 24 volt DC input voltage. As the result, by using resonant oscillation controlled by FPGA the high sinusoidal voltage until 1.0 kV peak-to peak has been generated in the load side.DOI: http://dx.doi.org/10.11591/ijpeds.v3i3.4316
                            
                         
                     
                 
                
                            
                    
                        A New Structure of Dynamic Voltage Restorer Based on Asymmetrical ????-source Inverters to Compensate Voltage Disturbances in Power Distribution Networks 
                    
                    Mahmoud Zadehbagheri; 
Rahim Ildarabadi; 
Majid Baghaei Nejad; 
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.pp344-359                            
                                            
                    
                        
                            
                            
                                
As a consequence of sensitive, diverse and complex loads in today's distribution networks, improving power quality in distribution systems has attracted great attention. Power quality issues involve voltage sags, transient interrupts and other distortions in sinusoidal waveforms. Enormous methods have been proposed for power quality modification. One of the methods by which power quality problems might be addressed is to apply power electronic devices in the form of custom power devices. One of such devices is Dynamic Voltage Restorer (DVR) which is connected in series to distribution networks. At the same time, through injection of voltage to the network it is able to control voltage amplitude and phase. It is adopted lend to compensate for voltage sags through injecting series and synchronous three phase voltage. Consisted of three single phase inverters and a DC bus, it can protect susceptible loads against various types of voltage sags as well as other disturbances in the power supply. Moreover, it is capable of generating and absorbing active and reactive power. Therefore, in this paper, different structures of  DVR have been investigated and eventually proposed a new structure for DVR based on Γ-Source asymmetric inverter. With the proposed structure, severe voltage sags can be retrieved 80- 90 percent. The simulation results that obtained by using MATLAB/Simulink indicate the properly functioning of proposed structure.