Mohammad Nawawi Seroji

A new single-phase dual converter using single-phase matrix converter

A new single-phase dual converter topology using single-phase matrix converter is presented. The converter is subjected to operating various passive loads during investigations. Basic DC motor models are also simulated to study the behavior and operation of the converter. Boost rectifier technique for power factor improvements are also presented for achieving low total harmonic distortion (THD) level. Selected simulation and experimental results are presented to verify operation.

Analysis and simulation of three-phase AC/DC full-bridge current injection series resonant converter (FBCISRC)

This paper presents the analysis and simulation of a three-phase AC/DC converter employing a new full-bridge current injection series resonant technique for power supply application. This new topology offers high switching frequency operation with converters loss is kept at minimum through the use of zero-voltage switching technique. Furthermore, the input current is inherently close to sinusoidal due to the current injection PWM technique resulting in high-power-factor operation. A good agreement was obtained between prediction and detailed simulation results.

Analysis and simulation of phase-shift control for three-phase AC/DC full-bridge current injection series resonant converter

This paper presents the analysis and simulation of phase-shift control for a three-phase full-bridge current injection series resonant converter. A steady-state analysis and a simple analytical expression for the converter was presented and derived. This phase-shift control with fixed high switching frequency operation is used to regulate the output voltage. A good agreement was obtained between prediction and detailed simulation results.

A study on THD reduction by active power filter applied using closed-loop current controlled AC-AC SPMC topology

An active power filter with single phase matrix converter topology is presented to reduce the THD of the input current, output current and output voltage of the system which is the main analysis in this paper. AC-AC converter topology switching strategy is used in the SPMC which is controlled by the current control closed-loop circuit or also known as active current wave-shaping technique. In order the AC-AC SPMC to operate and synthesize as an active power filter, the input supply current is being compensated by current control closed-loop circuit to produce the SPWM signal to be injected to the switches used which are the IGBTs. The work has been done using Matlab/Simulink simulation and the results are being compared to the same simulation done in open-loop method without using the active current wave-shaping technique.

Computer simulation model and performance analysis of high power factor three-phase AC-DC current injection hybrid resonant converter

This paper focuses on the computer simulation model and performance analysis of a new high power factor three-phase AC-DC current injection hybrid resonant converter. This paper consists of two main sections; first system design and modeling, second performance evaluation of the proposed system. The paper models the new topology of three-phase AC-DC current injection using series-parallel (hybrid) configurations of resonant converter in order to obtain high power factor and low total harmonics distortion (THD) level of the input current waveform, and uses the simulation method to evaluate the performance of the overall system. A high power factor is achieved by injecting high-frequency currents into the three-phase diode bridge rectifier, producing a high frequency modulation of the rectifier input voltages. Furthermore, the hybrid configuration solves the problem of the typical three-phase AC-DC current injection series resonant converter due to the principle limitation to regulate the output voltage at light or zero load conditions due to the load current varies in proportion to the resonant current. The simulation results of the proposed system design and modeling are presented and it is observed that the simulation model is consistent with the analytical results.

An optimization model of the input current for a variable input voltage in CMOS AC/DC converter

An optimization model of the input current for a variable input voltage in CMOS AC/DC converter is proposed in order to achieve regulation control of an AC/DC converter. An input current model of CMOS converter is obtained by applying an average method in converter circuit over ones switching period. This model is implemented in Pspice circuit simulation tool to verify an averaged model of the input current. The results show that the input current exhibits an increasing response to input voltage variation from 0.3 to 1.5 V. The validity of the proposed steady-state model is verified by the given simulation results for a specified design of CMOS converter. A good agreement is obtained between steady-state model and simulation results.

A simple direct-frequency control of AC/DC three-phase Current Injection Series Resonant Converter (CISRC)

This paper presents a simple practical implementation of direct-frequency control for Current Injection Series Resonant Converter (CISRC) to regulate the output voltage. Based on the control-to-output frequency response obtained from the small-signal model of the converter, a PI controller is proposed which provides robustness in relation to external disturbances and a good dynamic response of the output voltage. Controller design also involves a trade-off between reducing the output voltage ripple and maintaining the high quality input line current. Simulation and practical results are reported, confirming the validity of the proposed control technique.

Studies on safe-commutation switching sequence for controlled rectifier operation of Single-Phase Matrix Converter

This paper describes implementation of safe-commutation switching sequence for controlled rectifier operation of Single-Phase Matrix Converter (SPMC). Pulse Width Modulation (PWM) technique was used to calculate the switch duty ratio to synthesize the output. The switching sequence is arranged by providing a continuous path for current flow during switch transition to avoid voltage spikes due to the use of inductive load. A computer simulation model was developed to investigate the behaviour using MATLAB/Simulink (MLS) and PSpice. An experimental test-rig was then used to verify operation; incorporated with control electronics, gate drives, and power circuits. Selected simulations and experimental results are presented to verify operation.

Microinverter Topology based Single-stage Grid-connected Photovoltaic System: A Review

Received Mar 3, 2018 Revised Apr 11, 2018 Accepted Apr 21, 2018 Paintball has gained a huge popularity in Malaysia with growing number of tournaments organized nationwide. Currently, Ideal Pro Event, one of the paintball organizer found difficulties to pair a suitable opponent to against one another in a tournament. This is largely due to the manual matchmaking method that only randomly matches one team with another. Consequently, it is crucial to ensure a balanced tournament bracket where eventual winners and losers not facing one another in the very first round. This study proposes an intelligent matchmaking using Particle Swarm Optimization (PSO) and tournament management system for paintball organizers. PSO is a swarm intelligence algorithm that optimizes problems by gradually improving its current solutions, therefore countenancing the tournament bracket to be continually improved until the best is produced. Indirectly, through the development of the system, it is consider as an intelligence business idea since it able to save time and enhance the company productivity. This algorithm has been tested using 3 size of population; 100, 1000 and 10,000. As a result, the speed of convergence is consistent and has not been affected through big population.N. N. S. Abdul Rahman, N.M. Saad, A. R. Abdullah, M. R. M. Hassan, M. S. S. M. Basir, N. S. M. Noor 1,2,4,6Faculty of Electronic and Computer Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia 2,3Center for Robotics and Industrial Automation, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia 3,5Faculty of Electrical Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, MalaysiaLight rail transit (LRT), or fast tram is urban public transport using rolling stock similar to a tramway, but operating at a higher capacity, and often on an exclusive right-of-way. Indonesia as one of developing countries has been developed the LRT in two cities of Indonesia, Palembang and Jakarta. There are opinions toward the development of LRT, negative and positive opinions. To reveal the level of LRT development acceptance, this research uses machine learning approach to analyze the data which is gathered through social media. By conducting this paper, the data is modeled and classified in order to analyze the social sentiment towards the LRT development.Mohamad, S., Nasir, F.M., Sunar, M.S., Isa, K., Hanifa, R.M., Shah, S.M., Ribuan, M.N., Ahmad, A. 1,4,6,7,8Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn Malaysia, Johor, Malaysia 1,2,3UTM-IRDA Digital Media Centre, Media and Game Innovation Centre of Excellence, Universiti Teknologi Malaysia, Johor, Malaysia 1,2,3Faculty of Computing, Universiti Teknologi Malaysia, Johor, Malaysia 5Centre for Diploma Studies, Universiti Tun Hussein Onn Malaysia, Johor, Malaysia 6Research Centre for Applied Electromagnetics, Universiti Tun Hussein Onn Malaysia, Johor, MalaysiaReceived Jan 31, 2018 Revised Apr 21, 2018 Accepted Apr 30, 2018 Bluetooth is an emerging mobile ad-hoc network that accredits wireless communication to connect various short range devices. A single hop network called piconet is the basic communication topology of bluetooth which allows only eight active devices for communication among them seven are active slaves controlled by one master. Multiple piconets are interconnected through a common node, known as Relay, to form a massive network called as Scatternet. It is obvious that the performance of Scatternet scheduling is highly dependent and directly proportionate with the performance of the Relay node. In contrary, by reducing the number of Relays, it may lead to poor performance, since every Relay has to perform and support several piconet connections. The primary focus of this study is to observe the performance metrics that affects the inter-piconet scheduling since the Relay node’s role is like switch between multiple piconets. In this paper, we address and analyze the performance issues to be taken into consideration for efficient data flow in Scatternet based on Relay node.

Steady-state Analysis of Three-Phase AC to DC Converter using Current Injection Hybrid Resonant Converter for Power Factor Correction

This paper presents the simulation of the steadystate analysis and design Eqs. of high power factor three-phase AC to DC current injection hybrid resonant converter. The series-parallel (hybrid) resonant converter using current injection technique is the key concept of this paper, which is realized by injecting the high-frequency resonant current to the diode-bridge rectifier. Featuring a high power factor operation, the circuit offer low total harmonics distortion (THD) level of the input current waveforms, hence increase the quality of the power supply system. Both simulation and steady-state analysis (prediction) are carried out using MATLAB to verify the feasibility and the effectiveness of the proposed control strategy and theoretical analysis for the high power factor three-phase AC to DC current injection hybrid resonant converter.