The Experts below are selected from a list of 88575 Experts worldwide ranked by ideXlab platform
B W Williams - One of the best experts on this subject based on the ideXlab platform.
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a maximum power point Tracking Technique for partially shaded photovoltaic systems in microgrids
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Bader N Alajmi, K H Ahmed, S J Finney, B W WilliamsAbstract:A modified fuzzy-logic controller for maximum power point (MPP) Tracking is proposed to increase photovoltaic (PV) system performance during partially shaded conditions. Instead of perturbing and observing the PV system MPP, the controller scans and stores the maximum power during the perturbing and observing procedures. The controller offers accurate convergence to the global maximum operating point under different partial shadowing conditions. A mathematical model of the PV system under partial shadowing conditions is derived. To validate the proposed modified fuzzy-logic-based controller, simulation and experimentation results are provided.
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wind turbine power coefficient analysis of a new maximum power point Tracking Technique
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Yuanye Xia, K H Ahmed, B W WilliamsAbstract:A small-scale wind energy conversion system can track the maximum power point (MPP) based on a linear relationship between Vdc2 and Idc. Unlike conventional MPP Tracking (MPPT) methods using a lookup table, an advanced Technique is proposed based on this relationship as a variant of the perturb and observe (P&O) method. It not only has the advantages of the conventional P&O method but also has a faster Tracking speed and better performance. This paper theoretically analyzes the possible power coefficient drop when using a linear relationship for MPPT and establishes that the turbine design can ensure that the possible power coefficient drop is small. The simulation results show that the analysis is precise. The validity and performance of the proposed MPPT method are confirmed by both simulation and experimentation.
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a new maximum power point Tracking Technique for permanent magnet synchronous generator based wind energy conversion system
IEEE Transactions on Power Electronics, 2011Co-Authors: Yuanye Xia, K H Ahmed, B W WilliamsAbstract:A new maximum power point Tracking Technique for permanent magnet synchronous generator based wind energy conversion systems is proposed. The Technique searches for the system optimum relationship for maximum power point Tracking and then controls the system based on this relationship. The validity of the Technique is theoretically analyzed, and the design procedure is presented. The primary merit of the proposed Technique is that it does not require an anemometer or preknowledge of a system, but has an accurate and fast response to wind speed fluctuations. Moreover, it has the ability of online updating of time-dependant turbine or generator parameter shift. The validity and performance of the proposed Technique are confirmed by MATLAB/Simulink simulations and experimentations.
Daiwen Pang - One of the best experts on this subject based on the ideXlab platform.
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internalization of the pseudorabies virus via macropinocytosis analyzed by quantum dot based single virus Tracking
Chemical Communications, 2018Co-Authors: Yi Lin, Enze Sun, Bo Tang, Jiajia Wang, Zhenhua Zheng, Zhiling Zhang, Hanzhong Wang, Daiwen PangAbstract:With the aid of the single-virus Tracking Technique and the quantum dot-labeling strategy, the internalization of the pseudorabies virus (PrV) has been visualized in real time. The results demonstrate that macropinocytosis can be considered as a major pathway for PrV entering HeLa cells, which facilitates the development of therapeutics for virus-triggered diseases.
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effectively and efficiently dissecting the infection of influenza virus by quantum dot based single particle Tracking
ACS Nano, 2012Co-Authors: Zhiling Zhang, Zhiquan Tian, Haisu Zhao, Gengfu Xiao, Wanpo Zhang, Hanzhong Wang, Daiwen PangAbstract:Exploring the virus infection mechanisms is significant for defending against virus infection and providing a basis for studying endocytosis mechanisms. Single-particle Tracking Technique is a powerful tool to monitor virus infection in real time for obtaining dynamic information. In this study, we reported a quantum-dot-based single-particle Tracking Technique to efficiently and globally research the virus infection behaviors in individual cells. It was observed that many influenza viruses were moving rapidly, converging to the microtubule organizing center (MTOC), interacting with acidic endosomes, and finally entering the target endosomes for genome release, which provides a vivid portrayal of the five-stage virus infection process. This report settles a long-pending question of how viruses move and interact with acidic endosomes before genome release in the perinuclear region and also finds that influenza virus infection is likely to be a “MTOC rescue” model for genome release. The systemic Technique ...
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effectively and efficiently dissecting the infection of influenza virus by quantum dot based single particle Tracking
ACS Nano, 2012Co-Authors: Shulin Liu, Enze Sun, Zhiling Zhang, Zhiquan Tian, Haisu Zhao, Gengfu Xiao, Wanpo Zhang, Hanzhong Wang, Haibin Liu, Daiwen PangAbstract:Exploring the virus infection mechanisms is significant for defending against virus infection and providing a basis for studying endocytosis mechanisms. Single-particle Tracking Technique is a powerful tool to monitor virus infection in real time for obtaining dynamic information. In this study, we reported a quantum-dot-based single-particle Tracking Technique to efficiently and globally research the virus infection behaviors in individual cells. It was observed that many influenza viruses were moving rapidly, converging to the microtubule organizing center (MTOC), interacting with acidic endosomes, and finally entering the target endosomes for genome release, which provides a vivid portrayal of the five-stage virus infection process. This report settles a long-pending question of how viruses move and interact with acidic endosomes before genome release in the perinuclear region and also finds that influenza virus infection is likely to be a "MTOC rescue" model for genome release. The systemic Technique developed in this report is expected to be widely used for studying the mechanisms of virus infection and uncovering the secrets of endocytosis.
Essam E M Mohamed - One of the best experts on this subject based on the ideXlab platform.
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advanced multi sector p o maximum power point Tracking Technique for wind energy conversion system
International Journal of Electrical Power & Energy Systems, 2019Co-Authors: Abdelraheem Youssef, Ahmed Ali, Mahmoud S R Saeed, Essam E M MohamedAbstract:Abstract This article suggests a new solution for the limitations of conventional fixed step-size perturb and observe (PO) maximum power point Tracking (MPPT) of the wind energy conversion systems (WECSs). The proposed algorithm offers a new fast MPPT Technique and it keeps the controller searching in the correct region on the power-speed curve. For this issue, a variable-step perturb and observe (VS-PO) MPPT Technique based on multisector operation is proposed. The proposed Technique divides the operating region into four sectors by comparing the power-speed curve and a special synthesized curve. Hence, the selection of the appropriate step-size is related to the operating sector. For the two sectors close to the maximum power point (MPP), a small step-size is applied. Otherwise, the controller utilizes a large step-size. The large-scale grid-tied WECS is composed of the back-to-back (BTB) converter. The BTB converter is divided into dual sides; the machine side converter and the grid side converter. The proposed Technique has been validated over a large scale of 1.5 MW grid-tied PMSG-WECS using MATLAB/SIMULINK. The results prove the efficient operation of the proposed Technique based on the improved efficiency and the fast system response compared to conventional P&O Techniques.
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modified efficient perturb and observe maximum power point Tracking Technique for grid tied pv system
International Journal of Electrical Power & Energy Systems, 2018Co-Authors: Ahmed Ali, Mahmoud A Sayed, Essam E M MohamedAbstract:Abstract Conventional maximum power point Tracking (MPPT) Techniques such as Perturb and Observe (P&O) and Incremental Conductance (IncCond) are used in photovoltaic (PV) systems to extract the Maximum Power (MP). These algorithms cannot track the Maximum Power Point (MPP) under a rapidly changing insolation. This paper introduces a modified efficient variable step P&O (VSPO) algorithm as an attempt to solve the aforementioned problem. The VSPO Technique divides the PV-array operation region into four operating sectors. With the help of these four sectors, the step-size is changed according to how the sector far from the MPP. The performance of the conventional and variable step algorithms P&O Techniques is compared. Three-phase grid-tie inverter (GTI) is used to connect the system to the utility grid. MATLAB/SIMULINK software is used to study the validity of the modified Technique. The results demonstrate that the VSPO algorithm attains the MPP faster than the conventional Techniques and at reduced oscillation rate.
K H Ahmed - One of the best experts on this subject based on the ideXlab platform.
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a maximum power point Tracking Technique for partially shaded photovoltaic systems in microgrids
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Bader N Alajmi, K H Ahmed, S J Finney, B W WilliamsAbstract:A modified fuzzy-logic controller for maximum power point (MPP) Tracking is proposed to increase photovoltaic (PV) system performance during partially shaded conditions. Instead of perturbing and observing the PV system MPP, the controller scans and stores the maximum power during the perturbing and observing procedures. The controller offers accurate convergence to the global maximum operating point under different partial shadowing conditions. A mathematical model of the PV system under partial shadowing conditions is derived. To validate the proposed modified fuzzy-logic-based controller, simulation and experimentation results are provided.
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wind turbine power coefficient analysis of a new maximum power point Tracking Technique
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Yuanye Xia, K H Ahmed, B W WilliamsAbstract:A small-scale wind energy conversion system can track the maximum power point (MPP) based on a linear relationship between Vdc2 and Idc. Unlike conventional MPP Tracking (MPPT) methods using a lookup table, an advanced Technique is proposed based on this relationship as a variant of the perturb and observe (P&O) method. It not only has the advantages of the conventional P&O method but also has a faster Tracking speed and better performance. This paper theoretically analyzes the possible power coefficient drop when using a linear relationship for MPPT and establishes that the turbine design can ensure that the possible power coefficient drop is small. The simulation results show that the analysis is precise. The validity and performance of the proposed MPPT method are confirmed by both simulation and experimentation.
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a new maximum power point Tracking Technique for permanent magnet synchronous generator based wind energy conversion system
IEEE Transactions on Power Electronics, 2011Co-Authors: Yuanye Xia, K H Ahmed, B W WilliamsAbstract:A new maximum power point Tracking Technique for permanent magnet synchronous generator based wind energy conversion systems is proposed. The Technique searches for the system optimum relationship for maximum power point Tracking and then controls the system based on this relationship. The validity of the Technique is theoretically analyzed, and the design procedure is presented. The primary merit of the proposed Technique is that it does not require an anemometer or preknowledge of a system, but has an accurate and fast response to wind speed fluctuations. Moreover, it has the ability of online updating of time-dependant turbine or generator parameter shift. The validity and performance of the proposed Technique are confirmed by MATLAB/Simulink simulations and experimentations.
Yuanye Xia - One of the best experts on this subject based on the ideXlab platform.
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wind turbine power coefficient analysis of a new maximum power point Tracking Technique
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Yuanye Xia, K H Ahmed, B W WilliamsAbstract:A small-scale wind energy conversion system can track the maximum power point (MPP) based on a linear relationship between Vdc2 and Idc. Unlike conventional MPP Tracking (MPPT) methods using a lookup table, an advanced Technique is proposed based on this relationship as a variant of the perturb and observe (P&O) method. It not only has the advantages of the conventional P&O method but also has a faster Tracking speed and better performance. This paper theoretically analyzes the possible power coefficient drop when using a linear relationship for MPPT and establishes that the turbine design can ensure that the possible power coefficient drop is small. The simulation results show that the analysis is precise. The validity and performance of the proposed MPPT method are confirmed by both simulation and experimentation.
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a new maximum power point Tracking Technique for permanent magnet synchronous generator based wind energy conversion system
IEEE Transactions on Power Electronics, 2011Co-Authors: Yuanye Xia, K H Ahmed, B W WilliamsAbstract:A new maximum power point Tracking Technique for permanent magnet synchronous generator based wind energy conversion systems is proposed. The Technique searches for the system optimum relationship for maximum power point Tracking and then controls the system based on this relationship. The validity of the Technique is theoretically analyzed, and the design procedure is presented. The primary merit of the proposed Technique is that it does not require an anemometer or preknowledge of a system, but has an accurate and fast response to wind speed fluctuations. Moreover, it has the ability of online updating of time-dependant turbine or generator parameter shift. The validity and performance of the proposed Technique are confirmed by MATLAB/Simulink simulations and experimentations.
