Papers by Mohammad Mominur Rahman
Nanomaterials, 2021
The properties of polyethylene glycol-6000 (PEG)/MgCaCO3, a low-cost shape-selective phase change... more The properties of polyethylene glycol-6000 (PEG)/MgCaCO3, a low-cost shape-selective phase change material (ss-PCM), make it highly suitable for solar thermal applications. Nanosized porous MgO-doped CaCO3 with Mg molar concentrations of 5%, 10%, and 15% were synthesized using a hydrothermal technique. The prepared MgO-CaCO3 matrices were then impregnated with PEG to obtain PEG/MgCaCO3 as an ss-PCM. Samples identified as PEG-5MgCaCO3 (P-5-MCC), PEG-10MgCaCO3 (P-10-MCC), and PEG-15MgCaCO3 (P-15-MCC) were prepared and studied. Interestingly, P-10-MCC has the smallest particle size together with a good porous structure compared to the other two materials. The results of thermogravimetric analyses and differential scanning calorimetry indicate that the small particle size and porous structure facilitate the impregnation of approximately 69% of the PEG into the 10-MCC matrix. The latent heat and energy storage efficiency of PEG in the P-10-MCC sample are 152.5 J/g and 96.48%, respectivel...
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2020 Advances in Science and Engineering Technology International Conferences (ASET), 2020
Microgrids (MGs) are the important entities of distribution systems and more distributed generati... more Microgrids (MGs) are the important entities of distribution systems and more distributed generations (DGs) need to be considered to achieve maximum benefits under the full potential of MGs. By considering the important role of power converters in MGs, problem formulation with model predictive control (MPC) of reconfigurable converter (VSC) is implemented for AC/DC microgrid. The uncertainties due to the loads and sources (RESs) are investigated. Active front end (AFE) rectifier regulates the DC voltage and power is controlled through direct power MPC (DPMPC) during grid connection. Model predictive voltage control (MPVC) regulates AC load voltage in islanded mode. Furthermore, the transition between grid-connected and standalone is thoroughly investigated. MATLAB/SimulinkĀ® software authenticates the model performance evaluation of the suggested scheme for different loads. The proposed scheme shows superior attributes with reduced THD.
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Renewable and Sustainable Energy Reviews
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2021 International Conference on Electrical, Communication, and Computer Engineering (ICECCE)
Changes are taking place in the global energy sector, primarily to attain renewable transport tec... more Changes are taking place in the global energy sector, primarily to attain renewable transport technology. To minimize carbon gases, petrol, electricity, and hydrogen are also the most promising transport technologies. In this study, a hybrid power system for an electric vehicle charging station (EVCS) is proposed, which is consists of a photovoltaic (PV) panel, a wind turbine (WT), and a Fuel Cell (FC). The key aim is to design a power grid with high percentages of clean energy, reduced greenhouse gas emissions, and low energy prices. Therefore, switching from a grid-tied fossil fuel power system to a renewable and cleaner power system is more appealing. Nevertheless, nowadays the capital cost of system components of the hydrogen technology still is higher than others. The results of this paper recommend that PV/FC/Battery based system has economic benefits in off-grid energy systems. To simulate the ideal size of device components and to define cost-effective configurations based on Riyadh City, Saudi Arabia, the Hybrid Optimization Model for Multiple Energy Resources (HOMER) program is used.
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2020 Advances in Science and Engineering Technology International Conferences (ASET)
Fossil fuel-based power generation system is harmful to the environment, and the depleting stage ... more Fossil fuel-based power generation system is harmful to the environment, and the depleting stage of fossil fuel compelled the researchers to search for alternative ways of power generation. Solar energy is the most prospective way for alternative power generation. Photovoltaic (PV) panels can convert solar energy into electricity and with the technological evolution, PV panels have high efficiency now. Thus, a grid-connected PV system can be a good choice. In this research, an Electric Vehicle Charging Station (EVCS) carries out the economic feasibility of a PV -battery-based system at a commercial site. The location for the project has selected a supermarket in Riyadh, Saudi Arabia. The HOMER software provides the technical as well as economic results of the project considering the initial cost, net present cost (NPC), cost of energy (COE) with respect to renewable energy (RE) fraction and a different ratio of tariff (ROT). From all these data sensitivities analyzed are performed to choose the best scenario for EVCS.
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Catalysts
In this work, single-crystalline large-scale LaCO3OH nanoprism morphologies were synthesized by c... more In this work, single-crystalline large-scale LaCO3OH nanoprism morphologies were synthesized by controlling La and Ca molar ratio and the hydrothermal reaction conditions. The nanoprism morphologies of LaCO3OH were unique in nature with a sharp corner and smooth surfaces. The hydrothermal reaction was carried out in the absence of organic additives or templates and (NH4)2CO3 was used as a precipitation agent. The molar ratio of La:Ca was varied over the following values (the sample shorthand is given in parentheses): 75:25 mol% (LC-1), 50:50 mol% (LC-2), and 25:75 mol% (LC-3). Phase-pure LaCO3OH nanoprisms formed at a La:Ca molar ratio of 75:25 mol% without any assistance of catalysts or template. The photoluminescence (PL) properties of the as-synthesized powders showed one broad emission band centered at 394 nm after excitation of the pure LC-3 LaCO3OH nanoprisms at Ī» = 280 nm. The PL intensities were decreased in the order of LC-1 < LC-2< LC-3. The LC-1 and LC-2 samples had...
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IEEE, 2020
Microgrids (MGs) are the important entities of distribution systems and more distributed generati... more Microgrids (MGs) are the important entities of distribution systems and more distributed generations (DGs) need to be considered to achieve maximum benefits under the full potential of MGs. By considering the important role of power converters in MGs, problem formulation with model predictive control (MPC) of reconfigurable converter (VSC) is implemented for AC/DC microgrid. The uncertainties due to the loads and sources (RESs) are investigated. Active front end (AFE) rectifier regulates the DC voltage and power is controlled through direct power MPC (DPMPC) during grid connection. Model predictive voltage control (MPVC) regulates AC load voltage in islanded mode. Furthermore, the transition between grid-connected and standalone is thoroughly investigated. MATLAB/Simulink Ā® software authenticates the model performance evaluation of the suggested scheme for different loads. The proposed scheme shows superior attributes with reduced THD.
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MDPI, 2019
Heat energy storage systems were fabricated with the impregnation method using MgO and Mg(OH) 2 a... more Heat energy storage systems were fabricated with the impregnation method using MgO and Mg(OH) 2 as supporting materials and polyethylene glycol (PEG-6000) as the functional phase. MgO and Mg(OH) 2 were synthesized from the salt Mg(NO 3)Ā·6H 2 O by performing hydrothermal reactions with various precipitating agents. The precipitating agents were NaOH, KOH, NH 3 , NH 3 with pamoic acid (PA), or (NH 4) 2 CO 3. The result shows that the selection of the precipitating agent has a significant impact on the crystallite structure, size, and shape of the final products. Of the precipitating agents tested, only NaOH and NH 3 with PA produce single-phase Mg(OH) 2 as the as-synthesized product. Pore size distribution analyses revealed that the surfaces of the as-synthesized MgO have a slit-like pore structure with a broad-type pore size distribution, whereas the as-synthesized Mg(OH) 2 has a mesoporous structure with a narrow pore size distribution. This structure enhances the latent heat of the phase change material (PCM) as well as super cooling mitigation. The PEG/Mg(OH) 2 PCM also exhibits reproducible behavior over a large number of thermal cycles. Both MgO and Mg(OH) 2 matrices prevent the leakage of liquid PEG during the phase transition in phase change materials (PCMs). However, MgO/PEG has a low impregnation ratio and efficiency, with a low thermal storage capability. This is due to the large pore diameter, which does not allow MgO to retain a larger amount of PEG. The latent heat values of PEG-1000/PEG-6000 blends with MgO and Mg(OH) 2 were also determined with a view to extending the application of the PCMs to energy storage over wider temperature ranges.
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IEEE, 2020
There is no doubt that the condition or status assessment of the insulation of any medium voltage... more There is no doubt that the condition or status assessment of the insulation of any medium voltage (MV) cable is essential for the secure and reliable operation of electrical networks. It is reputed that the aging and degradation of the insulation causes severe damage to any MV equipment. Therefore, if these degradations of the insulation can be detected/diagnosed earlier, then corrective action can be initiated. Tan Delta (tan Ī“) or loss tangent is widely used as a diagnostic method for determining the quality of the insulation in cables. At low-frequency measurements of tan Ī“ (loss tangent) seem to yield much information about the state of the insulation. Similarly, in some cases frequency higher than 50 Hz or 60 Hz provides useful information about insulation status of MV cables. That is why the values of tan Ī“ are not strictly constant and but depend on various factors such as frequency, temperature, humidity, and voltage. Thus it is important to understand such relationships by experimental investigations. In this study measurement of tan Ī“ (TD) at different frequencies (such as 0.01 Hz, 0.1 Hz, 50 Hz, 100 Hz to 400 Hz, etc.) for MV cables will be evaluated. All measurements are taken under standard environmental conditions for new, service old and artificially laboratory aged samples. Finally, the obtained values of tan Ī“ from the measurements will be analyzed in order to find out if there is any correlation between tan Ī“ and frequencies (f) with the insulation condition/status under laboratory environment.
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Renewable and Sustainable Energy Reviews, 2020
Transportation electrification is one of the main research areas for the past decade. Electric ve... more Transportation electrification is one of the main research areas for the past decade. Electric vehicles (EVs) are taking over the market share of conventional internal combustion engine vehicles. The increasing popularity of EVs results in higher number of charging stations, which have significant effects on the electricity grid. Different charging strat2egies, as well as grid integration methods, are being developed to minimize the adverse effects of EV charging and to strengthen the benefits of EV grid integration. In this paper, a comprehensive review of the current situation of the EV market, standards, charging infrastructure, and the impact of EV charging on the grid is presented. The paper introduces the current EV status, and provides a comprehensive review on important international EV charging and grid interconnection standards. Different infrastructure configurations in terms of control and communication architectures for EV charging are studied and evaluated. The electric power market is studied by considering the participation roles of EV aggregators and individual EV owners, and different optimization and game based algorithms for EV grid integration management are reviewed. The paper specially presents an evaluation on how the future EV development, such as connected vehicles, autonomous driving, and shared mobility, would affect EV grid integration as well as the development of the power grid moves toward future energy Internet and how EVs would affect and benefit the development of the future energy Internet. Finally, the challenges and suggestions for the future development of the EV charging and grid integration infrastructure are evaluated and summarized.
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In the upcoming years, the number of electric vehicles (EVs) are expected to rise exponentially, ... more In the upcoming years, the number of electric vehicles (EVs) are expected to rise exponentially, due to the increase in oil price and the greenhouse impact associated with its use. We need a convenient opportunity for adapting plug-in hybrid electric vehicles (PHEVs), with the development of powertrain technology. Vehicle-to-Grid (V2G) system allows bi-directional electric power flow from an EV battery to the power grid, which opens a new revenue opportunity for PHEV owners as well as utilities. In a smart-grid environment, the V2G system will be able to provide grid ancillary services, such as load management, peak shaving, regulation, reserve and reduce power generation upgradation cost. In this paper, a quadratic programming (QP) based optimization model is used, which reduces overall grid power for utilities and operate smart charging and discharging schedule for PHEV users. In a V2G system, the outcomes of this model provide the highest power for charging PHEV batteries when electric power is enough to cover PHEV owners' demand, as well as provide power from PHEV batteries to the grid for the peak shaving and load management profiting the power grid.
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Conference Presentations by Mohammad Mominur Rahman
IEEE, 2020
Fossil fuel-based power generation system is harmful to the environment, and the depleting stage ... more Fossil fuel-based power generation system is harmful to the environment, and the depleting stage of fossil fuel compelled the researchers to search for alternative ways of power generation. Solar energy is the most prospective way for alternative power generation. Photovoltaic (PV) panels can convert solar energy into electricity and with the technological evolution, PV panels have high efficiency now. Thus, a grid-connected PV system can be a good choice. In this research, an Electric Vehicle Charging Station (EVCS) carries out the economic feasibility of a PV-battery-based system at a commercial site. The location for the project has selected a supermarket in Riyadh, Saudi Arabia. The HOMER software provides the technical as well as economic results of the project considering the initial cost, net present cost (NPC), cost of energy (COE) with respect to renewable energy (RE) fraction and a different ratio of tariff (ROT). From all these data sensitivities analyzed are performed to choose the best scenario for EVCS.
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Papers by Mohammad Mominur Rahman
Conference Presentations by Mohammad Mominur Rahman