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Generating capacity adequacy evaluation of large-scale, grid-connected photovoltaic systems

Frontiers in Energy 2016年第3期10卷 308-318页

作者： Amir AHADI Seyed Mohsen MIRYOUSEFI AVAL hosein HAYATI Young Researchers and Elite Club Ardabil Branch Islamic Azad University Ardabil *** Iran

Large-scale, grid-connected photovoltaic sys- tems have become an essential part of modem electric power distribution systems. In this paper, a novel approach based on the Markov method has been proposed to investigate the effects of large-scale, grid-connected photovoltaic systems on the reliability of bulk power systems. The proposed method serves as an applicable tool to estimate performance （e.g., energy yield and capacity） as well as reliability indices. The Markov method frame- work has been incorporated with the＇ multi-state models to develop energy states of the photovoltaic systems in order to quantify the effects of the photovoltaic systems on the power system adequacy. Such analysis assists planners to make adequate decisions based on the economical expectations as well as to ensure the recovery of the investment costs over time. The failure states of the components of photovoltaic systems have been considered to evaluate the sensitivity analysis and the adequacy indices including loss of load expectation, and expected energy not supplied. Moreover, the impacts of transitions between failures on the reliability calculations as well as on the long- term operation of the photovoltaic systems have been illustrated. Simulation results on the Roy Billinton test system has been shown to illustrate the procedure of the proposed frame work and evaluate the reliability benefits of using large-scale, grid-connected photovoltaic system on the bulk electric power systems. The proposed method can be easily extended to estimate the operating and maintenance costs for the financial planning of the photovoltaic system projects.

关键词： adequacy assessment Markov method large-scale grid-connected photovoltaic(PV) systems long-termoperation

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Reliability evaluation of future photovoltaic systems with smart operation strategy

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Frontiers in Energy 2016年第2期10卷 125-135页

作者： Amir AHADI hosein HAYATI SeyedMohsen MIRYOUSEFI AVAL Young Researchers and Elite Club Ardabil Branch Islamic AzadUniversity Ardabil *** Iran

This paper investigates a new operation strategy for photovoltaic （PV） systems, which improves the overall reliability of the system as a result of the improvement in the reliability of the critical components. First, a mathematical model is proposed using the fault tree analysis （FTA） to estimate the reliability of the PV systems in order to find the suitable maintenance strategies. The implementations demonstrate that it is essential to employ smart maintenance plans and monitor the identified most critical components of PV systems. Then, an innovative analytical method based on the Markov process is presented to model smart operation plans in PV systems. The impact of smart operation strategy on the PV systems is then evaluated. The objective of this paper is to develop plans for improving the reliability of PV systems. A series of case studies have been conducted to demonstrate the importance of smart operation well as the applicability and method. strategies for PV systems as feasibility of the proposed

关键词： smart operation strategy renewable energy,fault tree analysis (FTA) Markov model

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New concept and procedure for reliability assessment of an IEC 61850 based substation and distribution automation considering secondary device faults

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Frontiers in Energy 2015年第4期9卷 387-398页

作者： hosein HAYATI Amir AHADI Seyed Mohsen MIRYOUSEFI AVAL Young Researchers and Elite Club Ardabil Branch Islamic AzadUniversity Ardabil 56131-56491 Iran

Smart grid is a power grid consists of extensive monitoring systems which deal with the monitoring of attributes such as current, voltage, power, and energy at distribution transformers, substations transformers, distri- bution switching devices and smart meters. Smart grid with advanced communication technologies can be used for several purposes such as efficiency and reliability improvement. IEC 61850 is the core standard in the smart grid domain for distribution and substation automa- tion. This paper introduces a vision of modem substation and distribution systems using the IEC 61850. Network operators mainly assume that the modem substation and distribution systems based on the IEC 61850 are reliable for a long-time of operation. However, similar to any other systems, the implemented IEC 61850 might fail because of the operational failures or aging failures. This paper proposes a novel method for reliability evaluation of modem substation and distribution systems. A typical IEC 61850 based distribution and substation system is devel- oped and analyzed using the proposed method. The fault tree analysis （FTA） is used to quantify the reliability of the system. The technique is implemented and demonstrated on the Roy Billinton test system （RBTS）. The analysis is further extended on a 400/63 kV substation with a breaker- and-a-half configuration. In addition, the technique proves to be robust under different operations. The results verify the feasibility and applicability of the proposed method.

关键词： IEC 61850 reliability assessment fault treeanalysis

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Estimation of flexible pavement structural capacity using machine learning techniques

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Frontiers of Structural and Civil Engineering 2020年第5期14卷 1083-1096页

作者： Nader KARBALLAEEZADEH hosein GHASEMZADEH TEHRANI Danial MOHAMMADZADEH SHADMEHRI Shahaboddin SHAMSHIRBAND Civil Engineering Department Shahrood University of TechnologyShahrood ***Iran Department of Civil Engineering Ferdowsi University of MashhadMashhad ***Iran Department of Elite Relations with Industries Khorasan Construction Engineering OrganizationMashhad ***Iran Department for Management of Science and Technology Development Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Information Technology Ton Duc Thang UniversityHo Chi Minh CityVietnam

The most common index for representing structural condition of the pavement is the structural *** current procedure for determining structural numbers involves utilizing falling weight deflectometer and ground-penetrating radar tests,recording pavement surface deflections,and analyzing recorded deflections by back-calculation *** procedure has two drawbacks:falling weight deflectometer and ground-penetrating radar are expensive tests;back-calculation ways has some inherent shortcomings compared to exact methods as they adopt a trial and error *** this study,three machine learning methods entitled Gaussian process regression,M5P model tree,and random forest used for the prediction of structural numbers in flexible *** of this paper is related to 759 flexible pavement sections at Semnan and Khuzestan provinces in Iran and includes“structural number”as output and“surface deflections and surface temperature”as *** accuracy of results was examined based on three criteria of R,MAE,and *** the methods employed in this paper,random forest is the most accurate as it yields the best values for above criteria(R=0.841,MAE=0.592,and RMSE=0.760).The proposed method does not require to use ground penetrating radar test,which in turn reduce costs and work *** machine learning methods instead of back-calculation improves the calculation process quality and accuracy.

关键词： transportation infrastructure flexible pavement structural number prediction Gaussian process regression M5P model tree random forest

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Numerical Solution of the Distributed-Order Fractional Bagley-Torvik Equation

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IEEE/CAA Journal of Automatica Sinica 2019年第3期6卷 760-765页

作者： Hossein Aminikhah Amir hosein Refahi Sheikhani Tahereh Houlari Hadi Rezazadeh the Department of Applied Mathematics Faculty of Mathematical Sciences University of Guilan the Department of Applied Mathematics Faculty of Mathematical Sciences Islamic Azad University Lahijan Branch the Faculty of Engineering Technology Amol University of Special Modern Technologies Department of Applied Mathematics University of Guilan

In this paper, two numerical methods are proposed for solving distributed-order fractional Bagley-Torvik *** equation is used in modeling the motion of a rigid plate immersed in a Newtonian fluid with respect to the nonnegative density function. Using the composite Boole's rule the distributedorder Bagley-Torvik equation is approximated by a multi-term time-fractional equation, which is then solved by the GrunwaldLetnikov method(GLM) and the fractional differential transform method(FDTM). Finally, we compared our results with the exact results of some cases and show the excellent agreement between the approximate result and the exact solution.

关键词： Bagley-Torvik equation distributed-order fractional fractional differential transform method Grunwald- Letnikov method

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Effects of sodium nitroprusside on callus browning of Ficus religiosa: an important medicinal plant

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Journal of Forestry Research 2020年第3期31卷 789-796页

作者： Mohsen Hesami Masoud Tohidfar Milad Alizadeh Mohammad hosein Daneshvar Department of Horticultural Science Faculty of AgricultureUniversity of TehranKarajIran Department of Plant Biotechnology Faculty of Life Science and BiotechnologyShahid Beheshti UniversityTehranIran Department of Horticultural Science Faculty of AgricultureKhuzestan Agricultural Sciences and Natural Resources UniversityMollasaniIran

Tissue browning is a major problem in tissue culturing of woody plants, especially for Ficus religiosa which occurs by the accumulation and oxidation of phenolic compounds. This study aimed to determine the effect of different concentrations of sodium nitroprusside on the appearance of callus browning from leaf explants. The results indicate that callus browning was significantly reduced by supplementation of sodium nitroprusside to the MS medium and supplemented with 2.26μM of 2,4-dichlorophenoxyacetic acid and 0.22μM of 6-benzyl amino purine. The accumulation of hydrogen peroxide and phenolic compounds in the callus tissues decreased at the 50 μM concentration of sodium nitroprusside. Although catalase and peroxidase activities decreased at the 50μM concentration, the activity of superoxide dismutase and polyphenol oxidases, as well as proline content, increased exponentially. Sodium nitroprusside could be useful for the formation of non-embryogenic callus with high levels of metabolic activity for the production and isolation of secondary metabolites.

关键词： Nitric oxide Oxidative enzymes Proline Reactive oxygen species

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Rabies in medieval Persian literature – the Canon of Avicenna (980–1037 AD)

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Infectious Diseases of Poverty 2014年第1期3卷 56-61页

作者： Behnam Dalfardi Mohammad hosein Esnaashary Hassan Yarmohammadi Student Research Committee Shiraz University of Medical SciencesShirazIran Research Office for the History of Persian Medicine Shiraz University of Medical SciencesShirazIran

Ibn Sina(980-1037 AD),known by his full name Abu Ali al-Hussain ibn Abdallah ibn Sina and the Latin name‘Avicenna’,was a Persian scholar who is primarily remembered for his contributions to the science of *** authored Al-Qanun fi al-Tibb(The Canon of Medicine).Sections of his work are devoted to detailed descriptions of a number of infectious illnesses,particularly *** described rabies in humans and animals and explained its clinical manifestations,route of transmission,and treatment *** this article,our goal is to discuss Avicenna’s 11th-century points of view on rabies and compare them with modern medical knowledge.

关键词： Avicenna Canon of medicine Medieval history Persia Rabie

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A novel method for reliability and risk evaluation of wind energy conversion systems considering wind speed correlation

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Frontiers in Energy 2016年第1期10卷 46-56页

作者： Seyed Mohsen MIRYOUSEFI AVAL Amir AHADI hosein HAYATI Young Researchers and Elite Club Ardabil Branch Islamic AzadUniversity Ardabil Iran

This paper investigates an analytical approach for the reliability modeling of doubly fed induction generator （DFIG） wind turbines. At present, to the best of the authors＇ knowledge, wind speed and wind turbine generator outage have not been addressed simultaneously. In this paper, a novel methodology based on the Weibull- Markov method is proposed for evaluating the probabil- istic reliability of the bulk electric power systems, including DFIG wind turbines, considering wind speed and wind turbine generator outage. The proposed model is presented in terms of appropriate wind speed modeling as well as capacity outage probability table （COPT）, considering component failures of the wind turbine generators. Based on the proposed method, the COPT of the wind farm has been developed and utilized on the IEEE RBTS to estimate the well-known reliability and sensitive indices. The simulation results reveal the importance of inclusion of wind turbine generator outage as well as wind speed in the reliability assessment of the wind farms. Moreover, the proposed method reduces the complexity of using analytical methods and provides an accurate reliability model for the wind turbines. Furthermore, several case studies are considered to demonstrate the effectiveness of the proposed method in practical applications.

关键词： doubly-fed induction generator (DFIG) com- posite system adequacy assessment wind speed correlation

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Influence of growth conditions on the electrochemical synthesis of SnS thin films and their optical properties

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International Journal of Minerals,Metallurgy and Materials 2016年第3期23卷 348-357页

作者： hosein Kafashan Farid Jamali-Sheini Reza Ebrahimi-Kahrizsangi Ramin Yousefi Advanced Materials Research Center Materials Engineering DepartmentNajafabad BranchIslamic Azad UniversityNajafabadIsfahanIran Department of Physics Ahvaz BranchIslamic Azad UniversityAhvazIran Department of Physics Masjed-Soleiman BranchIslamic Azad University(I.A.U)Masjed-SoleimanIran

Tin sulfide （SnS） thin films were prepared by electrodeposition onto fluorine-doped tin oxide （FTO） glass substrates using an aqueous solution containing SnCl2 and Na2S2O3 at various deposition potentials （L） and bath concentrations. The pH value and temperature of the solution were kept constant. The deposited films were characterized using X-ray diffraction （XRD）, field-emission scanning electron microscopy （FESEM）, photoluminescence （PL）, and ultraviolet-visible （UV-Vis） spectroscopy. The FESEM images demonstrated that changes in the deposition potential （E） and solution concentration led to marked changes in the morphology of the deposited SnS films. Energy-dispersive X-ray analysis （EDXA） results showed that the SrdS atomic ratio strongly depended on both the solution concentration and the deposition potential. To obtain an SrdS atomic ratio approximately equal to l, the optimal Sn2＋/S2O2- 3 molar ratio and E parameter were 1/8 and -1.0 V, respectively. The XRD patterns showed that the synthesized SnS was obviously polycrystalline, with an orthorhombic structure. The effects of the variations of bath concentration and deposition potential on the band-gap energy （Eg） were studied using PL and UV-Vis experiments. The PL spectra of all the SnS films contained two peaks in the visible region and one peak in the infrared （IR） region. The UV-Vis spectra showed that the optical band-gap energy varies from 1.21 to 1.44 eV.

关键词： tin sulfide thin films electrodeposition structural properties optical properties

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Identification of hidden faults using determining velocity structure profile by spatial autocorrelation method in the west of Mashhad plain(Northeast of Iran)

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Journal of Mountain Science 2021年第12期18卷 3261-3274页

作者： Seyedeh Fatemeh NEMATI Naser HAFEZI MOGHADAS Gholam Reza LASHKARIPOUR hosein SADEGHI Department of Geology Faculty of ScienceFerdowsi University of MashhadMashhad 91775-1436Iran

Characterizing the subsurface structure is an important parameter for the improvement of seismic hazard *** to the tectonic complexity of the earth,some deep fractures do not reach the earth's surface and are not detectable with visual ***,the lack of knowledge of faults and fractures can result in disasters,especially in urban *** geophysical methods can be used to estimate subsurface structure ***,a more reliable method is required to assess seismic hazards and reduce potential damage in metropolitan areas without destroying buildings and *** paper aims to identify hidden faults and structures using shear wave velocity *** do this,surface wave dispersion curve was extracted from the vertical component of microtremor array recording using the spatial autocorrelation(SPAC)method in two profiles and 13 array stations(perpendicular to the altitudes)to obtain shear wave velocity structure(Vs)in the west of Mashhad,northeast of *** results of shear wave velocity profiles(Vs)indicate sudden changes in the thickness of *** can be related to the displacement of a normal fault in this area causing the bottom rock to fall and an increase in the alluvial thickness in the central part of the *** velocity in the floor rock is 2000 meters per second in this *** to the surface outcrops and water wells data,its material is slate and Phyllite metamorphic rocks that are exposed in the adjacent ***,the seismic profile results were well consistent with electrical resistance data and well logs indicating that the tool array method is flexible,non-invasive,relatively fast,and effective for urban areas with satisfactory accuracy.

关键词： Subsurface Structure Hidden Fault Array Microtremor SPAC Method Vs Profile Mashhad Seismic hazard assessment

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