The Experts below are selected from a list of 37095 Experts worldwide ranked by ideXlab platform

Cherif Larbes - One of the best experts on this subject based on the ideXlab platform.

  • Modeling, analysis and comparison of solar photovoltaic Array Configurations under partial shading conditions
    Solar Energy, 2015
    Co-Authors: Faiza Belhachat, Cherif Larbes
    Abstract:

    Abstract The main purpose of this paper is to model, study and analyze the performance of different photovoltaic (PV) Array Configurations under various partial shading conditions (PSC). The aim is to improve the efficiency of PV systems in general by reducing mismatch losses and to select the most appropriate PV Array Configuration which provides the best performance i.e. the highest maximum power and hence the lowest relative power losses under partial shading conditions. For this purpose, a comprehensive study which considers all the available PV Array Configurations: Series (S), Parallel (P), Series–Parallel (SP), Total-Cross-Tied (TCT), Bridge-Linked (BL), and Honey-Comb (HC), is carried out under all possible scenarios of shading. The performance and output characteristics of these Array Configurations are analyzed and compared by using a 6 × 4 PV Array size under various possible shading scenarios. The Bishop model of a photovoltaic module which describes best the solar cell behavior at negative voltages is considered in this paper for modeling the PV Arrays, and it is implemented by using the Simulink and SimPower software. On the whole, the obtained results prove the superiority of the TCT Configuration which provides the best performances under most cases of PSC: uneven or random distribution of partial shading. However, for some cases of PSC this is not the case because the performance depends strongly on the patterns of shade. Therefore, this paper will enrich and complement previous studies in this area through a detailed analysis and comprehensive study of the different PV Array Configurations under all possible shading scenarios which may occur in reality, the thing that has not been carried out previously. In addition, these results represent an interesting guide which provides useful and relevant information concerning the performance of each PV Array Configuration under any pattern of shading. This will allow the estimation and prediction of maximum power and consequently will help to select the most suitable PV Array Configuration.

Koichi Ichige - One of the best experts on this subject based on the ideXlab platform.

  • An Optimum 2D Sparse Array Configuration with Reduced Mutual Coupling
    2018
    Co-Authors: Shogo Nakamura, Sho Iwazaki, Koichi Ichige
    Abstract:

    This paper presents a novel 2D sparse Array Configuration which reduces mutual coupling effect. It can be realized to identify $\boldsymbol {O} \boldsymbol {O} (\boldsymbol {N} \boldsymbol {N} ^{mathbf{22}})$ uncorrelated sources for $\boldsymbol {N} \boldsymbol {N}$ physical sensors Array by making difference co-Array. However, the existence of the mutual coupling makes it difficult. The hourglass Array can be regarded as a 2-D sparse Array Configuration robust to the effect of mutual coupling. We further try to reduce the effect of mutual coupling through the optimization by SA (Simulated Annealing). Performance of the proposed Array is evaluated through computer simulation.

  • extension of two level nested Array with larger aperture and more degrees of freedom
    International Symposium on Antennas and Propagation, 2016
    Co-Authors: Yuki Iizuka, Koichi Ichige
    Abstract:

    This paper presents a novel Array Configuration which improves the accuracy for high-resolution direction of arrival (DOA) estimation using the concept of Khatri-Rao (KR) product. We extended the concept of two-level nested Array and found a novel Array Configuration which has larger Array aperture and more degree of freedom compared with that of the two-level nested Array. The performance of the proposed Array is evaluated through computer simulation.

  • Sum and difference composite co-Array: An extended Array Configuration toward higher degree of freedom
    2016 International Conference on Advances in Electrical Electronic and Systems Engineering (ICAEES), 2016
    Co-Authors: Sho Iwazaki, Koichi Ichige
    Abstract:

    This paper presents a novel Array Configuration based on the combination of the sum and difference co-Arrays. There have been many studies on the Array antenna Configurations which enhances the Array degree of freedom (DOF), however the maximum DOF of the Configurations based on the difference co-Array is often limited. We try to further enhance the DOF by combining the concepts of the sum coArray and the difference co-Array, which is called “sum and difference composite co-Array”. The performance of the proposed Array Configuration is evaluated through computer simulation of beamforming.

  • EUSIPCO - 3-D Array Configuration using multiple regular tetrahedra for high-resolution 2-D DOA estimation
    2014
    Co-Authors: Yuki Doi, Koichi Ichige, Hiroyuki Arai, Hiromi Matsuno, Masayuki Nakano
    Abstract:

    This paper presents a novel 3-D Array Configuration using multiple regular tetrahedra which enables high resolution 2-D DOA estimation. The proposed Array Configuration has better DOA estimation performance as that of the conventional 3-D Array Configuration for uncorrelated waves, and can be rearranged into the cuboid Array Configuration which can estimate DOAs of correlated waves. Performance of the proposed 3-D Array Configuration is evaluated through a computer simulation.

  • Cuboid Array: A novel 3-D Array Configuration for high resolution 2-D DOA estimation
    SiPS 2013 Proceedings, 2013
    Co-Authors: Hiroki Moriya, Koichi Ichige, Hiroyuki Arai, Takahiro Hayashi, Hiromi Matsuno, Masayuki Nakano
    Abstract:

    This paper presents a novel 3-D cuboid Array Configuration which enables high resolution 2-D DOA estimation. The authors have already proposed a 3-D Array Configuration which improves the elevation estimation accuracy, but the Array Configuration cannot estimate DOAs of correlated waves. The proposed cuboid Array Configuration has almost the same DOA estimation performance as that of the conventional 3-D Array Configuration for uncorrelated waves, and can estimate DOAs of coherent waves where the conventional Configuration is unable to do so. Performance of the proposed 3-D cuboid Array Configuration is evaluated through a computer simulation.

Faiza Belhachat - One of the best experts on this subject based on the ideXlab platform.

  • Modeling, analysis and comparison of solar photovoltaic Array Configurations under partial shading conditions
    Solar Energy, 2015
    Co-Authors: Faiza Belhachat, Cherif Larbes
    Abstract:

    Abstract The main purpose of this paper is to model, study and analyze the performance of different photovoltaic (PV) Array Configurations under various partial shading conditions (PSC). The aim is to improve the efficiency of PV systems in general by reducing mismatch losses and to select the most appropriate PV Array Configuration which provides the best performance i.e. the highest maximum power and hence the lowest relative power losses under partial shading conditions. For this purpose, a comprehensive study which considers all the available PV Array Configurations: Series (S), Parallel (P), Series–Parallel (SP), Total-Cross-Tied (TCT), Bridge-Linked (BL), and Honey-Comb (HC), is carried out under all possible scenarios of shading. The performance and output characteristics of these Array Configurations are analyzed and compared by using a 6 × 4 PV Array size under various possible shading scenarios. The Bishop model of a photovoltaic module which describes best the solar cell behavior at negative voltages is considered in this paper for modeling the PV Arrays, and it is implemented by using the Simulink and SimPower software. On the whole, the obtained results prove the superiority of the TCT Configuration which provides the best performances under most cases of PSC: uneven or random distribution of partial shading. However, for some cases of PSC this is not the case because the performance depends strongly on the patterns of shade. Therefore, this paper will enrich and complement previous studies in this area through a detailed analysis and comprehensive study of the different PV Array Configurations under all possible shading scenarios which may occur in reality, the thing that has not been carried out previously. In addition, these results represent an interesting guide which provides useful and relevant information concerning the performance of each PV Array Configuration under any pattern of shading. This will allow the estimation and prediction of maximum power and consequently will help to select the most suitable PV Array Configuration.

Li Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Seven indicators variations for multiple PV Array Configurations under partial shading and faulty PV conditions
    Renewable Energy, 2017
    Co-Authors: Mahmoud Dhimish, Violeta Holmes, Bruce Mehrdadi, Mark Dales, Benjamin Chong, Li Zhang
    Abstract:

    The goal of this paper is to model, compare and analyze the performance of multiple photovoltaic (PV) Array Configurations under various partial shading and faulty PV conditions. For this purpose, a multiple PV Array Configurations including series (S), parallel (P), series-parallel (SP), total-cross-tied (TCT) and bridge-linked (BL) are carried out under several partial shading conditions such as, increase or decrease in the partial shading on a row of PV modules and increase or decrease in the partial shading on a column of PV modules. Additionally, in order to test the performance of each PV Configuration under faulty PV conditions, from 1 to 6 Faulty PV modules have been disconnected in each PV Array Configuration. Several indicators such as short circuit current (Isc), current at maximum power point (Impp), open circuit voltage (Voc), voltage at maximum power point (Vmpp), series resistance (Rs), fill factor (FF) and thermal voltage (Vte) have been used to compare the obtained results from each partial shading and PV faulty condition applied to the PV system. MATLAB/Simulink software is used to perform the simulation and the analysis for each examined PV Array Configuration.

Shuai Jiang - One of the best experts on this subject based on the ideXlab platform.

  • influence of the pzt sensor Array Configuration on lamb wave tomography imaging with the rapid algorithm for hole and crack detection
    Sensors, 2020
    Co-Authors: Songlai Wang, Yiping Shen, Yi Liu, Shuai Jiang
    Abstract:

    The tomography technique is an effective way to quantitatively evaluate damage from reconstruction imaging in structure health monitoring (SHM). The reconstruction algorithm for the probabilistic inspection of damage (RAPID) algorithm based on the signal difference coefficient (SDC) feature is a promising approach due to its superior performance. This paper focuses on the influence of different patterns of PZT (Lead Zirconate Titanate) sensor Array Configurations, i.e., the circular, square, and parallel Array, on reconstruction image qualities for evaluating hole and crack damage. Variable shape parameters are applied to account for the unequal damage distances of different actuator-sensor pairs. Considering the directionality scattering fields of cracks, the angular scattering pattern of the SDC values are studied by simulation. The SDC variations for different groups of sensing paths at the same actuator are applied to predict the crack orientation. An improved RAPID algorithm is proposed by defining an additional SDC value of 1 in the path along the predicted crack orientation, which is determined by the point of the actuator causing the minimal SDC variation and the center point of the initial reconstruction image of the crack. The results show that the improved RAPID algorithm is effective for the evaluation of crack damage. Reconstruction image qualities with three PZT sensor Array Configurations for both holes and cracks are compared. The research is significant for selecting the PZT sensor Array Configuration in SHM.