Prof. Dr. Saad Mekhilef | University of Malaya, Malaysia (original) (raw)

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Papers by Prof. Dr. Saad Mekhilef

Research paper thumbnail of A support vector machine–firefly algorithm-based model for global solar radiation prediction

Solar Energy, May 1, 2015

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Research paper thumbnail of Retraction Note to: Potential of support vector regression for solar radiation prediction in Nigeria

Natural Hazards, May 25, 2020

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Research paper thumbnail of RETRACTED ARTICLE: Potential of support vector regression for solar radiation prediction in Nigeria

Natural Hazards, Feb 8, 2015

ABSTRACT In this paper, the accuracy of soft computing technique in solar radiation prediction ba... more ABSTRACT In this paper, the accuracy of soft computing technique in solar radiation prediction based on series of measured meteorological data (monthly mean sunshine duration, monthly mean maximum and minimum temperature) taking from Iseyin meteorological station in Nigeria was examined. The process, which simulates the solar radiation with support vector regression (SVR), was constructed. The inputs were monthly mean maximum temperature (T max), monthly mean minimum temperature (T min) and monthly mean sunshine duration ( \( \bar{n} \) ). Polynomial and radial basis functions (RBF) are applied as the SVR kernel function to estimate solar radiation. According to the results, a greater improvement in estimation accuracy can be achieved through the SVR with polynomial basis function compared to RBF. The SVR coefficient of determination R 2 with the polynomial function was 0.7395 and with the radial basis function, the R 2 was 0.5877.

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Research paper thumbnail of Techno-economic feasibility of hybrid renewable energy system for rural health centre (RHC): The wayward for quality health delivery

Role of off-grid renewable energy in extending basic healthcare services to rural villages where ... more Role of off-grid renewable energy in extending basic healthcare services to rural villages where there is no grid extension or unreliable power supply cannot be over emphasized. This paper thus evaluated the technical and economic benefit of powering off-grid rural health clinic with renewable energy resources. The rural clinic selected as a case study in this paper is situated at Fatika rural village in northern Nigeria. Techno-economic analysis was carried out with HOMER software and the analysis found PV/diesel/battery best optimal configuration among other considered configurations. The results obtained proved greater potential of hybrid renewable energy system configuration consisting PV, diesel and battery in providing electricity to the rural health clinics far away from grid centers.

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Research paper thumbnail of Performance analysis of hybrid PV/diesel/battery system using HOMER: A case study Sabah, Malaysia

Energy Conversion and Management, Jul 1, 2017

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Research paper thumbnail of Performance assessment of three grid-connected photovoltaic systems with combined capacity of 6.575 kWp in Malaysia

Journal of Cleaner Production, 2020

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Research paper thumbnail of A Fuzzy-Based PI Controller for Power Management of a Grid-Connected PV-SOFC Hybrid System

Energies, 2017

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Research paper thumbnail of Hybrid renewable energy supply for rural healthcare facilities: An approach to quality healthcare delivery

Sustainable Energy Technologies and Assessments, 2018

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Research paper thumbnail of Application of extreme learning machine for short term output power forecasting of three grid-connected PV systems

Journal of Cleaner Production, 2017

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Research paper thumbnail of Performance evaluation of a stand-alone PV-wind-diesel-battery hybrid system feasible for a large resort center in South China Sea, Malaysia

Sustainable Cities and Society, 2017

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Research paper thumbnail of Energy management strategies in hybrid renewable energy systems: A review

Renewable and Sustainable Energy Reviews, 2016

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Research paper thumbnail of Global Solar Radiation Forecasting Based on SVM-Wavelet Transform Algorithm

International Journal of Intelligent Systems and Applications, 2016

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Research paper thumbnail of Hybrid renewable power supply for rural health clinics (RHC) in six geo-political zones of Nigeria

Sustainable Energy Technologies and Assessments, 2016

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Research paper thumbnail of Extended maximum boost control scheme based on single‐phase modulator for three‐phase Z‐source inverter

IET Power Electronics, 2016

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Research paper thumbnail of Renewable Energy (Published 2015)

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Research paper thumbnail of Economic evaluation of hybrid energy systems for rural electrification in six geo-political zones of Nigeria

Renewable Energy, 2015

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Research paper thumbnail of A transformerless reduced switch counts three-phase APF-assisted smart EV charger

In order to reduce the system cost, volumetric size and weight of an electric vehicles (EVs) batt... more In order to reduce the system cost, volumetric size and weight of an electric vehicles (EVs) battery charger, a novel four-switch two-leg VSI configuration is propose for rapid battery charging with the active power filter (APF) features. It consists of cost-effective two-arm bridge converter, coupling inductors, LC filters, buck converter and EV battery. Note that the conventional three-leg bridge structure is reduce to two-leg VSI structure, functioning like three-phase rectifier to converts power from ac-dc during the battery charging process. The third-leg and set of power switching devices are eliminate by directly connecting the grid phase with the negative terminals of dc-link capacitor. Therefore, third leg of the EV charger is use as a buck converter for battery charging. The charger controller ensures the rapid charging capabilities in constant current and constant voltage (CC-CV) modes, with additional functions of harmonic compensation capability, power factor correction, reactive power compensation and constant dc-link voltage. The experimental results verify the validity and effectiveness performance of the laboratory based EV charger prototype.

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Research paper thumbnail of Transformer-less 3P3W SAPF (three-phase three-wire shunt active power filter) with line-interactive UPS (uninterruptible power supply) and battery energy storage stage

Energy, Aug 1, 2016

In this article, a transformer-less 3P3W SAPF (three-phase three-wire shunt active power filter) ... more In this article, a transformer-less 3P3W SAPF (three-phase three-wire shunt active power filter) integrated into the distributed energy network which embeds line-interactive UPS and bi-directional chopper-fed energy storage equipment. The proposed system operates in two operating modes of line-interactive UPS (uninterruptible power supply) with bi-chopper-fed battery energy storage stage. In normal mode of operation, the main power supply current charges the standby bi-chopper fed battery energy storage equipment, in addition to APF feature. When the main power supply is severed, it operates as a backup power source to the load. The feasibility of the distributed energy network is improved, by eliminating the transformer and reduced power component, to provide accurate performance, less cost and reduced size as compare to previous topologies. The PI (proportional integral) controller ensures the regulated sinusoidal voltage with unity power factor, phase amplitude, and low THD (total harmonic distortion) into the distributed energy grid. For proper batteries energy storage stage, active power filtering and UPS operation, the SRF (synchronous-reference-frame) method with PLL (phase locked loop) scheme is implemented. The test result of 5 kW prototype system tested in simulation and laboratory validates the claimed performance in the distribution power energy network.

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Research paper thumbnail of Active power filter (APF) for mitigation of power quality issues in grid integration of wind and photovoltaic energy conversion system

Renewable & Sustainable Energy Reviews, Apr 1, 2017

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Research paper thumbnail of A Review on Primary and Secondary Controls of Inverter-interfaced Microgrid

Journal of Modern Power Systems and Clean Energy, 2021

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Research paper thumbnail of A support vector machine–firefly algorithm-based model for global solar radiation prediction

Solar Energy, May 1, 2015

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Research paper thumbnail of Retraction Note to: Potential of support vector regression for solar radiation prediction in Nigeria

Natural Hazards, May 25, 2020

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Research paper thumbnail of RETRACTED ARTICLE: Potential of support vector regression for solar radiation prediction in Nigeria

Natural Hazards, Feb 8, 2015

ABSTRACT In this paper, the accuracy of soft computing technique in solar radiation prediction ba... more ABSTRACT In this paper, the accuracy of soft computing technique in solar radiation prediction based on series of measured meteorological data (monthly mean sunshine duration, monthly mean maximum and minimum temperature) taking from Iseyin meteorological station in Nigeria was examined. The process, which simulates the solar radiation with support vector regression (SVR), was constructed. The inputs were monthly mean maximum temperature (T max), monthly mean minimum temperature (T min) and monthly mean sunshine duration ( \( \bar{n} \) ). Polynomial and radial basis functions (RBF) are applied as the SVR kernel function to estimate solar radiation. According to the results, a greater improvement in estimation accuracy can be achieved through the SVR with polynomial basis function compared to RBF. The SVR coefficient of determination R 2 with the polynomial function was 0.7395 and with the radial basis function, the R 2 was 0.5877.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Techno-economic feasibility of hybrid renewable energy system for rural health centre (RHC): The wayward for quality health delivery

Role of off-grid renewable energy in extending basic healthcare services to rural villages where ... more Role of off-grid renewable energy in extending basic healthcare services to rural villages where there is no grid extension or unreliable power supply cannot be over emphasized. This paper thus evaluated the technical and economic benefit of powering off-grid rural health clinic with renewable energy resources. The rural clinic selected as a case study in this paper is situated at Fatika rural village in northern Nigeria. Techno-economic analysis was carried out with HOMER software and the analysis found PV/diesel/battery best optimal configuration among other considered configurations. The results obtained proved greater potential of hybrid renewable energy system configuration consisting PV, diesel and battery in providing electricity to the rural health clinics far away from grid centers.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Performance analysis of hybrid PV/diesel/battery system using HOMER: A case study Sabah, Malaysia

Energy Conversion and Management, Jul 1, 2017

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Research paper thumbnail of Performance assessment of three grid-connected photovoltaic systems with combined capacity of 6.575 kWp in Malaysia

Journal of Cleaner Production, 2020

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Research paper thumbnail of A Fuzzy-Based PI Controller for Power Management of a Grid-Connected PV-SOFC Hybrid System

Energies, 2017

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Research paper thumbnail of Hybrid renewable energy supply for rural healthcare facilities: An approach to quality healthcare delivery

Sustainable Energy Technologies and Assessments, 2018

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Research paper thumbnail of Application of extreme learning machine for short term output power forecasting of three grid-connected PV systems

Journal of Cleaner Production, 2017

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Research paper thumbnail of Performance evaluation of a stand-alone PV-wind-diesel-battery hybrid system feasible for a large resort center in South China Sea, Malaysia

Sustainable Cities and Society, 2017

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Research paper thumbnail of Energy management strategies in hybrid renewable energy systems: A review

Renewable and Sustainable Energy Reviews, 2016

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Research paper thumbnail of Global Solar Radiation Forecasting Based on SVM-Wavelet Transform Algorithm

International Journal of Intelligent Systems and Applications, 2016

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Research paper thumbnail of Hybrid renewable power supply for rural health clinics (RHC) in six geo-political zones of Nigeria

Sustainable Energy Technologies and Assessments, 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Extended maximum boost control scheme based on single‐phase modulator for three‐phase Z‐source inverter

IET Power Electronics, 2016

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Research paper thumbnail of Renewable Energy (Published 2015)

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Economic evaluation of hybrid energy systems for rural electrification in six geo-political zones of Nigeria

Renewable Energy, 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A transformerless reduced switch counts three-phase APF-assisted smart EV charger

In order to reduce the system cost, volumetric size and weight of an electric vehicles (EVs) batt... more In order to reduce the system cost, volumetric size and weight of an electric vehicles (EVs) battery charger, a novel four-switch two-leg VSI configuration is propose for rapid battery charging with the active power filter (APF) features. It consists of cost-effective two-arm bridge converter, coupling inductors, LC filters, buck converter and EV battery. Note that the conventional three-leg bridge structure is reduce to two-leg VSI structure, functioning like three-phase rectifier to converts power from ac-dc during the battery charging process. The third-leg and set of power switching devices are eliminate by directly connecting the grid phase with the negative terminals of dc-link capacitor. Therefore, third leg of the EV charger is use as a buck converter for battery charging. The charger controller ensures the rapid charging capabilities in constant current and constant voltage (CC-CV) modes, with additional functions of harmonic compensation capability, power factor correction, reactive power compensation and constant dc-link voltage. The experimental results verify the validity and effectiveness performance of the laboratory based EV charger prototype.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Transformer-less 3P3W SAPF (three-phase three-wire shunt active power filter) with line-interactive UPS (uninterruptible power supply) and battery energy storage stage

Energy, Aug 1, 2016

In this article, a transformer-less 3P3W SAPF (three-phase three-wire shunt active power filter) ... more In this article, a transformer-less 3P3W SAPF (three-phase three-wire shunt active power filter) integrated into the distributed energy network which embeds line-interactive UPS and bi-directional chopper-fed energy storage equipment. The proposed system operates in two operating modes of line-interactive UPS (uninterruptible power supply) with bi-chopper-fed battery energy storage stage. In normal mode of operation, the main power supply current charges the standby bi-chopper fed battery energy storage equipment, in addition to APF feature. When the main power supply is severed, it operates as a backup power source to the load. The feasibility of the distributed energy network is improved, by eliminating the transformer and reduced power component, to provide accurate performance, less cost and reduced size as compare to previous topologies. The PI (proportional integral) controller ensures the regulated sinusoidal voltage with unity power factor, phase amplitude, and low THD (total harmonic distortion) into the distributed energy grid. For proper batteries energy storage stage, active power filtering and UPS operation, the SRF (synchronous-reference-frame) method with PLL (phase locked loop) scheme is implemented. The test result of 5 kW prototype system tested in simulation and laboratory validates the claimed performance in the distribution power energy network.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Active power filter (APF) for mitigation of power quality issues in grid integration of wind and photovoltaic energy conversion system

Renewable & Sustainable Energy Reviews, Apr 1, 2017

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A Review on Primary and Secondary Controls of Inverter-interfaced Microgrid

Journal of Modern Power Systems and Clean Energy, 2021

Bookmarks Related papers MentionsView impact