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Full-Text Articles in Electronic Devices and Semiconductor Manufacturing
A Fast-Converging Mppt Technique For Photovoltaic System Under Fast Varying Solar Irradiation And Load Resistance, Saad Mekhilef
A Fast-Converging Mppt Technique For Photovoltaic System Under Fast Varying Solar Irradiation And Load Resistance, Saad Mekhilef
Saad Mekhilef
Under fast varying solar irradiation and load resistance, a fast-converging maximum power point tracking system is required to ensure the photovoltaic system response rapidly with minimum power losses. Traditionally, maximum power point locus was used to provide such a fast response. However, the algorithm requires extra control loop or intermittent disconnection of the PV module. Hence, this paper proposes a simpler fast-converging maximum power point tracking technique, which excludes the extra control loop and intermittent disconnection. In the proposed algorithm, the relationship between the load line and the I–V curve is used with trigonometry rule to obtain the fast response. …
Novel Configuration For Multilevel Dc-Link Three-Phase Five-Level Inverter, Saad Mekhilef
Novel Configuration For Multilevel Dc-Link Three-Phase Five-Level Inverter, Saad Mekhilef
Saad Mekhilef
new multilevel DC-link three-phase five-level voltage source inverter topology is introduced here. A multilevel DClink formed from single DC voltage supply and two cascaded half-bridge (CHB) power cells is connected to 12-switch threephase bridge in such a way that the proposed inverter produces five levels in the output voltage waveform. Compared to comparable inverters, such as symmetrical CHB and hybrid multilevel inverters, the proposed topology maximises the number of voltage levels and reduces the number of utilised DC voltage supplies, switches, gate driver circuits and installation area. A modified fundamental frequency modulation technique based on determination of switching states of …
Boundary Control Of Dual-Output Boost Converter Using State-Energy Plane, Saad Mekhilef
Boundary Control Of Dual-Output Boost Converter Using State-Energy Plane, Saad Mekhilef
Saad Mekhilef
A boundary control scheme for dual-output boost converter (DBC) with enhanced performance using second-order switching surface is presented in this study. The derivation of the switching surface is performed in state-energy plane rather than the state-plane to obtain a general geometrical representation that provides a good dynamic response during start-up and sudden load changes, achieving steady state in two switching actions. To illustrate the control characteristic and performance, a detailed mathematical analysis is fully developed and compared with other control methods for the DBC. The proposed control was simulated, implemented in a digital signal processor TMS320F2812, and tested using prototype …
Modified Incremental Conductance Algorithm For Photovoltaic System Under Partial Shading Conditions And Load Variation, Saad Mekhilef
Modified Incremental Conductance Algorithm For Photovoltaic System Under Partial Shading Conditions And Load Variation, Saad Mekhilef
Saad Mekhilef
Under partial shading conditions, multiple peaks are observed in the power–voltage (P–V ) characteristic curve of a photovoltaic (PV) array, and the conventional maximum power point tracking (MPPT) algorithms may fail to track the global maximum power point (GMPP). Therefore, this paper proposes a modified incremental conductance (Inc Cond) algorithm that is able to track the GMPP under partial shading conditions and load variation. A novel algorithm is introduced to modulate the duty cycle of the dc–dc converter in order to ensure fast MPPT process. Simulation and hardware implementation are carried out to evaluate the effectiveness of the proposed algorithm …
Long-Term Wind Speed Forecasting And General Pattern Recognition Using Neural Networks, Saad Mekhilef
Long-Term Wind Speed Forecasting And General Pattern Recognition Using Neural Networks, Saad Mekhilef
Saad Mekhilef
Long-term forecasting of wind speed has become a research hot spot in many different areas such as restructured electricity markets, energy management, and wind farm optimal design. However, wind energy with unstable and intermittent characteristics entails establishing accurate predicted data to avoid inefficient and less reliable results. The proposed study in this paper may provide a solution regarding the long-term wind speed forecast in order to solve the earlier-mentioned problems. For this purpose, two fundamentally different approaches, the statistical and the neural network-based approaches, have been developed to predict hourly wind speed data of the subsequent year. The novelty of …
New Three-Phase Multilevel Inverter With Reduced Number Of Power Electronic Components, Saad Mekhilef
New Three-Phase Multilevel Inverter With Reduced Number Of Power Electronic Components, Saad Mekhilef
Saad Mekhilef
In this paper, a new configuration of a three-phase five-level multilevel voltage-source inverter is introduced. The proposed topology constitutes the conventional three-phase two-level bridge with three bidirectional switches. A multilevel dc link using fixed dc voltage supply and cascaded half-bridge is connected in such a way that the proposed inverter outputs the required output voltage levels. The fundamental frequency staircase modulation technique is easily used to generate the appropriate switching gate signals. For the purpose of increasing the number of voltage levels with fewer number of power electronic components, the structure of the proposed inverter is extended and different methods …
Novel Three-Phase Asymmetrical Cascaded Multilevel Voltage Source Inverter, Saad Mekhilef
Novel Three-Phase Asymmetrical Cascaded Multilevel Voltage Source Inverter, Saad Mekhilef
Saad Mekhilef
Series connection of power cells in asymmetrical cascaded configurations helps to cancel redundant output levels and maximise the number of different levels generated by the inverter. A new configuration of three-phase multilevel asymmetrical cascaded voltage source inverter is presented. This structure consists of series-connected sub-multilevel inverters blocks. The number of utilised switches, insulated gate driver circuits, voltage standing on switches, installation area and cost are considerably reduced. Cascaded-cell DC voltages in each inverter leg form an arithmetic sequence with common difference of E. With the selected inverter DC sources, high-frequency pulse-width modulation (PWM) control methods can be effectively applied without …
Digital Control Of Three Phase Three-Stage Hybrid Multilevel Inverter, Saad Mekhilef
Digital Control Of Three Phase Three-Stage Hybrid Multilevel Inverter, Saad Mekhilef
Saad Mekhilef
Three-stage 18-level hybrid inverter design with novel control method is presented. The inverter consists of main high-, medium-, and low-voltage stages connected in series from the output side. The high-voltage stage is a three-phase, six-switch conventional subinverter. Themedium- and low-voltage stages are made of three-level subinverters constructed by H-bridge units. The proposed control strategy assumes a reference input voltage vector and aims to approximate it to the nearest inverter vector. The control concept is based on holding the high-voltage state as long as it is feasible to do so. The reference voltage vector has been represented in a 60 -spaced …
Analysis And Implementation Of Transformerless Lcl Resonant Power Supply For Ozone Generation, Saad Mekhilef
Analysis And Implementation Of Transformerless Lcl Resonant Power Supply For Ozone Generation, Saad Mekhilef
Saad Mekhilef
This paper describes the analysis and design of an LCL resonant power supply for ozone generation. The main advantage of the proposed topology is the absence of high-voltage transformer; the high voltage gain is achievable by means of doubleresonance phenomena. Furthermore, the bandwidth is wider than the ordinary LC and its phase difference is constant over specific frequency range; as a result, an open-loop operation can be implemented. The complete analysis and design procedure of the power supply is presented. The design procedure is verified by implementing the power supply to drive a dielectric barrier discharge prototype ozone chamber. The …
An Improved Particle Swarm Optimization (Pso)–Based Mppt For Pv With Reduced Steady-State Oscillation, Saad Mekhilef
An Improved Particle Swarm Optimization (Pso)–Based Mppt For Pv With Reduced Steady-State Oscillation, Saad Mekhilef
Saad Mekhilef
No abstract provided.
Modeling Of Three-Phase Uniform Symmetrical Sampling Digital Pwm For Power Converter, Saad Mekhilef
Modeling Of Three-Phase Uniform Symmetrical Sampling Digital Pwm For Power Converter, Saad Mekhilef
Saad Mekhilef
A mathematical approach of modeling and analyzing three-phase pulsewidth modulation (PWM) is presented. The three-phase flyback converter required a unique pattern of PWM to optimize the power transfer in the magnetic circuit used in the converter. The three-phase PWM is generated digitally based on uniform symmetrical sampling technique using Xilinx chip. The generated PWM pattern is able to reduce the magnitude of the low order of harmonic components present in the input ac supply. Although software simulation could simulate the PWM pattern, it does not represent the exact pattern as being generated digitally. The mathematical approach used is to model …