Publication Date: 2022
Vibrant Virtual Brazilian Anthropology (18094341)19
This paper presents and discusses some examples of how mathematical figures and engineering approaches can be detected in anthropological theorizing and how a mathematical reading of certain anthropological theories is possible and sometimes fruitful. The paper proceeds in three steps: a comparison between experimental measuring and engineering “black boxing” as different ways of representing ethnographic reportage and anthropological theorizing; a discussion of feedback loops in anthropological theorizing; and a discussion of chaos theory and fractal geometry and some of their uses in anthropological writing. I finish by hinting at the fruitfulness of making allies across disciplinary boundaries given our anthropocenic predicaments and limitations in our cross disciplinary analogies. © 2022, Brazilian Anthropology Association. All rights reserved.
Publication Date: 2019
Mana: Estudos de Antropologia Social (01049313)25(2)pp. 391-426
This article sketches some elements of what we suggest to call a "politics of regard" pertinent to the forms of action and organization of indigenous collectives in the lowlands of South America. The purpose is to analyze the relation between two Strathernian ideas with applicability in the region: a) any meaningful action could be explained, understood or justified as involving the separation between a person who acts and another person taken as the cause of action; and b) being recognized as a person, or occupying the place of a moral agent, implies being under the regard of another person. Considering these two ideas, we also revisit some classic themes of the ethnological literature, namely: the relation between power and coercion, and the theme of the masters-owners. © 2019 Universidade Federal do Rio de Janeiro-UFRJ.
Da cunha, M.C.,
Caixeta, R.,
Campbell, J.M.,
Fausto, C.,
Ghasemi, V.,
Lomnitz, C.,
Sulkin, C.D.L.,
Pompeia, C.,
Vilaça, A. Publication Date: 2017
HAU: Journal of Ethnographic Theory (20491115)7(2)pp. 403-426
Agribusiness has unprecedented leverage over highly unpopular Brazilian president Michel Temer, who is faced with several corruption charges and is struggling for political survival. In a little over one year, the agribusiness lobby and its allies have managed to erode thirty years of human rights and conservation laws. Indigenous peoples and their territorial rights are among the main targets of such policies, and there is no resolution to the situation in sight. With the insight of several scholars, the following forum assesses the consequences of losing the protection the Citizens' Constitution of 1988 once afforded indigenous peoples in Brazil. © Giovanni da Col.
Amazonian indigenous peoples have preserved many aspects of their culture and cosmology while also developing complex relationships with dominant non-indigenous society. Until now, anthropological writing on Amazonian peoples has been divided between "traditional" topics like kinship, cosmology, ritual, and myth, on the one hand, and the analysis of their struggles with the nation-state on the other. What has been lacking is work that bridges these two approaches and takes into consideration the meaning of relationships with the state from an indigenous perspective. That long-standing dichotomy is challenged in this new ethnography by anthropologist José Kelly. Kelly places the study of culture and cosmology squarely within the context of the modern nation-state and its institutions. He explores Indian-white relations as seen through the operation of a state-run health system among the indigenous Yanomami of southern Venezuela. With theoretical foundations in the fields of medical and Amazonian anthropology, Kelly sheds light on how Amerindian cosmology shapes concepts of the state at the community level. The result is a symmetrical anthropology that treats white and Amerindian perceptions of each other within a single theoretical framework, thus expanding our understanding of each group and its influences on the other. This book will be valuable to those studying Amazonian peoples, medical anthropology, development studies, and Latin America. Its new takes on theory and methodology make it ideal for classroom use. © 2011 The Arizona Board of Regents. All rights reserved.
Publication Date: 2011
Journal de la Societe des Americanistes (19577842)97(1)pp. 339-357
Izadi, A.,
Mohammadi, M.,
Memar, S.,
Nasekhian, S. Publication Date: 2024
Historic Environment: Policy and Practice (17567505)15(3)pp. 360-382
Approaches to cultural sustainability in the historic environment aims to recognise and leverage their inherent cultural potential. Historic areas have been the focus of increased attention due to their significant cultural capacity compared to other urban areas. This study aims to develop a conceptual model for cultural sustainability in historic environments, using Structural Functionalism Theory as its analytical framework. Cultural sustainability is conceptualised as a comprehensive construct, with its components drawn from various charters, declarations, and international protocols related to the preservation of historic sites, established by organisations like the Organisation of World Heritage Cities, UNESCO, and ICOMOS since the 1990s. Some components have also been chosen based on prior research. Through documentary research and literature reviews, the functions of each component are aligned with Structural Functionalism Theory. The research results offer a detailed analysis of the cultural sustainability system. In this framework, symbolic capital, cultural neighbourhoods, authenticity, and value serve the functions of adaptation, goal attainment, integrity, and latent pattern maintenance, respectively. This analysis follows the principles of the Structural Functionalism Theory by examining the distinct functions and roles of these components at the secondary level. The historic environment of Dardasht provides a practical example where the model has been applied. © 2024 Informa UK Limited, trading as Taylor & Francis Group.
Publication Date: 2023
International Journal Of Information Science And Management (20088310)21(2)pp. 157-174
This study attempts to measure scientific literacy among the citizens of Ahvaz. The data collection tool was a validated questionnaire with 5 dimensions, 25 components, and 316 items. The study's statistical population involved all the citizens of Ahvaz over 18 years of age, and the stratified random sampling method was utilized. Besides, 600 questionnaires were distributed in Ahvaz Municipality, of which 401 completed questionnaires were finally analyzed. Data was analyzed using a one-sample t-test and Friedman test via SPSS and Excel software. The results showed that the scientific literacy among the citizens of Ahvaz was above average. It is therefore suggested that managers and policymakers in Ahvaz use the results of the present study and conduct periodic surveys on the scientific literacy of Ahvaz citizens to solve their problems and improve their level of scientific literacy. The validated questionnaire used in the present study can be administered in similar studies on micro and macro scales © 2023,International Journal of Information Science and Management. All Rights Reserved.
Safdari - dehcheshmeh, F.,
Noroozi, M.,
Memar, S.,
Taleghani, F. Publication Date: 2023
Journal of Education and Health Promotion (22779531)12(1)pp. 48-48
The COVID-19 pandemic has had considerable consequences in many areas of life, including the social area and childbearing plans. The present narrative review aimed to examine the childbearing decisions and its related factors during the COVID-19 pandemic. This review was conducted by searching in scientific databases, including Web of Science, Science Direct, Google Scholar, Scopus, Cochrane, PubMed, ProQuest, Scientific Information Database (SID), Iranian Research Institute for Information Science and Technology (IranDoc) and Iranian Journal Database (Magiran) in June 2022. The search resulted in 111 sources, of which 16 were in line with the research objective. Couples have mainly cancelled or delayed their previous plans related to childbearing decisions. There are two groups of direct and indirect factors related to childbearing decisions during the COVID-19 pandemic: The former includes (1) well-being-related factors such as economic conditions, interpersonal relationships and gender roles in terms of task division; and (2) health-related factors, including health emergencies and physical and psychological health. The latter includes factors such as social distancing and social media. Based on the results, governments should facilitate childbearing by adjusting existing policies, addressing economic insecurity and protecting the livelihoods of those affected by the crisis. Health policymakers and planners must also prioritize women's access to reproductive health services in a safe environment while promoting equity in access. It is also necessary to promote the quality and quantity of indirect care and virtual counseling based on the needs of women in crisis. © 2023 Advanced Biomedical Research | Published by Wolters Kluwer - Medknow.
Izadi, A.,
Mohammadi, M.,
Nasekhian, S.,
Memar, S. Publication Date: 2020
Historic Environment: Policy and Practice (17567505)11(2-3)pp. 158-180
Sustainable regeneration is an approach whose objective is to improve the economic, social and physical state of the historic environment. Social systems theory proposed by Talcott Parsons is similar to sustainable regeneration in that it approaches society as a functioning whole and seeks to understand the interrelatedness of its constituent parts. The aim of the present paper is to present a social sustainability model in the context of historic regeneration based on Parsons’ Systems Theory (AGIL). The statistical population of the research includes documents related to conservation released by Organization of World Heritage Cities, UNESCO and ICOMOS from 1990s onwards. The content validity of the research has been confirmed with an agreement coefficient of 87.6% in a Scott test and the research shows that, where cited, social capital has the function of adaptation, the component of equity has the function of goal attainment, social cohesion has the function of integration, and the component of identity has the function of latent pattern maintenance in the social sustainability of the historic environment. According to Parsons’ theory, each of the above components is considered as a system and the function of their indices was determined in a second analysis level. © 2020 Informa UK Limited, trading as Taylor & Francis Group.
Publication Date: 2013
Mediterranean Journal of Social Sciences (discontinued) (20392117)4(6)pp. 469-480
Today the societies have sure changed through communication advancement and have made lots of changes in culture and daily lives of people. It can be said that new media Have impact on the life styles and general tastes of people. It seems that the growth of The number of internet users and internet social networks has created a new life style Among the young called "virtual life style" this life style integrated with virtual social Networks influence all daily activities. The purpose of the present research is analysis of Changes in the life style of the young created by introduction and popularity of virtual Social networks. the present study was conducted through survey, available and Voluntary sampling and online researcher-made questionnaire. Statistical population of the study consisted of all face book users in Isfahan. The results of the study suggest that there is difference between life style of the people who are members in face book and people who are not. It should be said shopping pattern and cultural consumption of the people differ according to their membership or non-membership however, nutrition pattern and body management have no relation With membership in face boo. The duration of connection of face book has greatly affected nutrition pattern.
Publication Date: 2013
Mediterranean Journal of Social Sciences (discontinued) (20392117)4(6)pp. 489-496
Although Internet and virtual world have provided formerly non-existent chance for Iranian youth, Internet pathology has been paid less attention. Present research, applying critical procedure to cyber friendship and liquid love, tries to analyze this phenomenon among Iranian youth from different aspects. The research applying a qualitative procedure that is content analysis, has collected and analyzed the issues relevant to cyber friendship on weblogs of Iranian bloggers. Collected issues have been categorized and analyzed by qualitative method and finally regarding collected issues, researchers have done analysis and made some predictions. Research results suggest that most Iranian youth have negative attitude toward cyber friendship. Their most important reason for criticizing this type of friendship is that it can be harmful and deceptive. Cyber friendship has lots of supporters in Iran. Nevertheless, it has more opponents among Internet users, specially bloggers. Also, reviewing the bloggers, negative narration of this kind of friendship shows that most of them have had positive attitude toward cyber friendship in the past.
Jafari, F.,
Badakhshiyan, S.,
Naghavi, A.,
Jazayeri, R.A. Publication Date: 2024
Trauma, Violence, and Abuse (15248380)25(5)pp. 3504-3514
This study aimed to conduct an overview of systematic reviews in the field of violence against adults with disability. Eight electronic databases as well as gray literature from January 2022 to April 2023 were searched to identify systematic reviews that focused on violence against adults with disabilities. A total of 13 high-quality systematic reviews were included in the overview. Findings show that adults with disabilities experience a higher rate of emotional and physical violence than the general population. Sociodemographic, financial, and cultural risk factors, prevention, and treatment approaches were discussed. Although the large body of studies on disability and violence have explored different aspects of the issue, there are some limitations and gaps in the literature that need further attention. The most important gap in the literature is the lack of attention to diversity. Accordingly, there is little knowledge about disability and violence in a variety of geographical locations. In addition, studies on violence based on ethnicity/race, age, gender identifications, and some types of disabilities such as hearing impairments or severe disabilities were scarce. There is a need to reach diverse populations of adults with disabilities, through employing a variety of data collection methods and qualitative research methodology. Prevention and treatment programs should be developed with attention to types of disability, and they should be culturally and linguistically sensitive. © The Author(s) 2024.
Jafari, F.,
Ghezelsefloo, M.,
Jazayeri, R.A.,
Bahrami, F.,
Mohammadi, R. Publication Date: 2016
Journal of Mazandaran University of Medical Sciences (17359260)26(139)pp. 137-148
Background and purpose: One of the important features of a successful and long-term marriage is marital commitment. Self-compassion could well predict improvements in marital relations. The aim of this study was to examine the relationship between original family health and self-compassion with marital commitment. Materials and methods: A descriptive correlational study was performed in 372 married individuals selected by multiple cluster sampling. Data was collected using the Family of Origin Scale (FOS) and Self-Compassion Scale. Data analysis was done applying Pearson’s correlation coefficient and multiple linear regressions. Results: The mean age of the participant was 37±7.42 years. The results showed a significant positive correlation between marital commitment and health of the original family, self–kindness, common humanity, and mindfulness subscales (P< 0.01). We found a significant negative correlation between marital commitment and health of the original family, self-judgment, isolation, and over-identification subscales (P< 0.01). Also health of the original family and subscales of self-kindness, common humanity, self-judgment and mindfulness could highly predict marital commitment. Conclusion: Health of the original family and self-compassion play important roles in improving marital relationships. Therefore, self-compassion focused therapies could increase mental health and create self-compassionate behavior and consequently enhance marriage durability. © 2016, Mazandaran University of Medical Sciences. All rights reserved.
Publication Date: 2025
Energy Conversion and Management: X (25901745)27
Microgrids enable the integration of renewable energy sources; however, managing electricity from intermittent wind and solar power remains a significant challenge. This study investigates two storage strategies for managing surplus renewable electricity in an IEEE 84-Bus microgrid with wind turbines and photovoltaic units. The first option involves producing hydrogen via electrolyzers, which is stored for later electricity generation through fuel cells. The second option involves converting surplus electricity into heat using heat pumps, which is then stored in thermal energy storage systems to efficiently meet the microgrid's thermal load requirements. A scenario-based day-ahead scheduling model is proposed to optimize the microgrid's electrical and thermal load management while considering uncertainties in market prices, wind speeds, and solar irradiance. The resulting large-scale optimization challenge is effectively tackled using the self-adaptive charge system search algorithm. The results indicate that, for the optimal utilization of excess renewable electricity, heat generation via heat pumps is more cost-effective than hydrogen production, primarily due to the inefficiencies in hydrogen conversion and the ability of heat pumps to produce several units of heat for each unit of electricity consumed. Moreover, heat pumps prove to be more economical than natural gas combustion in boilers for meeting the thermal demands across a wide range of gas prices. These findings highlight the economic benefits of integrating heat pumps and thermal energy storage systems into renewable energy microgrids. © 2025 The Author(s)
Publication Date: 2025
Physica Scripta (00318949)100(5)
This study presents the design and analysis of an optimized Surface Plasmon Resonance (SPR) sensor for enhancing the detection sensitivity of crude oil samples. Conventional SPR sensors, which commonly use gold or silver layers, are limited in stability and sensitivity when measuring complex substances like crude oil at near-infrared wavelengths. In this work, we develop a sodium-based SPR sensor coated with Transition Metal Dichalcogenides (TMDCs), and an oxide layer for real-time crude oil sensing. The sensor’s performance is optimized through theoretical simulation using the Transfer Matrix Method (TMM) and Finite Element Method (FEM) with Kretschmann configuration at the near-infrared wavelength (1550 nm). The performance parameters of SPR sensors, including sensitivity, detection accuracy, and signal-to-noise ratio, were measured, indicating significant improvements over traditional SPR configurations. The maximum sensitivity achieved is 169.382 deg RIU−1 with FoM of 162.867 1/RIU. Results demonstrate that the proposed sensor provides high sensitivity and reliability for detecting and analyzing real-time crude oil refractive index changes, marking a potential breakthrough in petrochemical analysis. © 2025 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.
Publication Date: 2025
Energy (0360-5442)318
In recent years, reinforcing the electric power system against natural disasters has emerged as a critical challenge and concern. Natural disasters, events, and cyber-attacks pose significant challenges to distribution networks, leading to widespread outages and blackouts. One effective approach to addressing such challenges is to implement a microgrid formation strategy in conjunction with mobile or stationary distributed energy resources. This paper addresses a significant research gap by analyzing load restoration during outages as a part of network resilience strategy, through two simultaneous approaches: (i) microgrid formation and graph theory, and (ii) mobile charging station with battery swapping technology. The proposed microgrid formation utilizes tie-line breaker switches (BS) and a mobile battery-swapping van (MBSV) in a coordinated manner to enhance resilience of system. The IEEE 33-bus network serves as a case study, incorporating both active and reactive powers into the nonlinear power flow equations. Mixed integer linear programming (MILP) is employed, effectively linearizing nonlinear equations for efficient computation. The results show that within 24 h, the objective function value (total power of restored loads) is approximately 687,421 kW, and load restoration is achieved at a rate of 76 %. According to the comparative study, the network without formation suffers from voltage collapse while the proposed plan properly deals with voltage fluctuations and fixes the voltage magnitude within bounds. Additionally, the present research shows load restoration rates that are 5.8 % higher compared to the formed network without a battery swapping station, and 2.3 % higher compared to the formed network with a fixed battery swapping station. During the outages, the MBSV is dispatched to the affected area to maximize the total power of restored loads, primarily due to the high priority of loads in this region. Simulations of network performance under long-term failure is conducted with limited and unlimited fuel. In both cases, batteries discharge after 8 h. With limited fuel, the network performance drops to 55 %, while with unlimited fuel, it drops to 40 %. © 2025 Elsevier Ltd
Publication Date: 2024
IET Smart Grid (25152947)7(5)pp. 531-553
A comprehensive model is developed for coordinated control of voltage-frequency-inertia and identifying multiple cyberattacks simultaneously in two microgrids (MGs). The MGs are integrated with solar units, Wind turbine (WT), hybrid supercapacitor-battery, and fuelcell. The MGs are modelled and controlled for operation under both an island and connected states. In the proposed method, a data centre is designed in which all the electrical and control signals related to the solar, wind, hybrid supercapacitor-battery, and Fuel cell (FC) are collected, evaluated, and matched. The data centre comprises the following blocks: voltage-frequency control, inertia control of WT, and identification of false data injection (FDI) cyberattacks on frequency, power, power/frequency, and voltage. The technique used in this article to identify FDI attacks is based on the real-time method coupled with logical comparisons conducted in the time domain. This methodology provides prompt and precise detection, allowing for timely preventive measures and strategic responses. After FDI attacks occur, the implemented control system effectively manages and regulates the voltage and frequency at the desired levels, efficiently differentiating between ordinary functioning, faulty states, and potential cyber-attacks. The unhealthy MG can transfer its load to the healthy MG for safety reasons. The healthy MG is then connected to the external grid and the synchronisation conditions are checked by the proposed control system. The results of the non-linear simulation performed in MATLAB-Simulink software confirm that the proposed model successfully operates and controls all resources (i.e. solar/wind/battery/FC), regulates the voltage/frequency under various loading conditions, and identifies FDI cyberattacks. © 2024 The Authors. IET Smart Grid published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.
Publication Date: 2024
Journal of Cleaner Production (0959-6526)471
The rising occurrences of natural disasters, terrorist actions, and cyber-attacks that result in extensive, long-lasting, and expensive disruptions have necessitated a shift in focus towards the resilience of electrical grids for network operators. However, the task of designing a resilient network remains complex and costly. One potential solution to bolster resilience is the deployment of battery energy storage devices on the consumer side, known as distributed energy systems (DES). Despite its effectiveness, the high construction costs and lengthy payback period associated with investing in energy storage devices have led consumers to exhibit reluctance in adopting them. Cloud energy storage (CES) is an innovative and cost-effective solution to address those challenges. In the CES platform, investors install storage facilities in the network which can be rented by consumers to fulfill their needs and they become holders of the virtual batteries. By adopting this approach, consumers are relieved from the burden of maintenance, repair, and installation. While a single CES facility offers reduced costs and increased comfort for consumers, it compromises the resilience of the grid when compared to the Distributed Energy Storage (DES) mechanism. In order to bridge this gap, this paper proposes a dual CES model which serves as an intermediate solution between DES and single CES. The dual CES model strikes a balance between the resilience of the grid and cost-effectiveness. It provides a higher level of resilience compared to a single CES and a lower level compared to DES. Additionally, the costs associated with the dual CES model fall between that of a single CES and DES. This model not only increases the profit margin for investors but also enhances the overall comfort and well-being of consumers compared to the single CES. To validate the proposed model, a Mixed Integer Linear Programming (MILP) problem is formulated and simulated on the IEEE 33 bus network. Three cases are considered: DES, single CES, and dual CES. The results indicate that the dual CES reduces consumers' costs by 28 %, losses by 27 %, unsupplied load costs by 45 %, and return on investment by 33 %. Moreover, it increases the stability margin time by 2 intervals and improves robustness by 47 %. © 2024 Elsevier Ltd
Publication Date: 2024
Journal of Chemical Physics (10897690)161(9)
We investigate the numerical accuracy of the extended Koopmans’s theorem (EKT) in reproducing the full configuration interaction (FCI) and complete active-space configuration interaction (CAS-CI) ionization energies (IEs) of atomic and molecular systems calculated as the difference between the energies of N and (N − 1) electron states. In particular, we study the convergence of the EKT IEs to their exact values as the basis set and the active space sizes vary. We find that the first FCI EKT IEs approach their exact counterparts as the basis set size increases. However, increasing the basis set or the active space sizes does not always lead to more accurate CAS-CI EKT IEs. Our investigation supports the observation of Davidson et al. [J. Chem. Phys. 155, 051102 (2021)] that the FCI EKT IEs can be systematically improved with arbitrary numerical accuracy by supplementing the basis set with diffuse functions of appropriate symmetry, which allow the detached electron to travel far away from the reference system. By changing the exponent and the center of the diffuse functions, our results delineate a complex pattern for the CAS-CI EKT IE of LiH, which can be important for the spectroscopic studies of small molecules. © 2024 Author(s).
Publication Date: 2024
Energy (0360-5442)295
In light of the recent developments in the green hydrogen industry, it is essential to investigate its compatibility and integration with existing electrical grids. This task becomes more challenging when considering its implementation in off-grid sites that solely rely on renewable energy. In cases where off-grid sites should provide electricity and hydrogen to a variety of consumers, it is compulsory to have electrical and hydrogen storage devices with long-term storage capabilities. Consequently, a precise programming technique is necessary to manage the storage and consumption of hydrogen and electricity. To investigate such a model, this paper presents a connected electricity-hydrogen grid in which all the required energy is supplied by solar and hydroelectric units. This off-grid system supplies the necessary energy for industrial and residential loads, electric vehicle charging stations, fuelcell car refueling stations, and natural gas pipelines. The power-to-hydrogen (P2H) and hydrogen-to-power (H2P) systems are used to facilitate energy flow between the electrical and hydrogen sectors. A daily-seasonal hydrogen storage is integrated as well. The proposed method contributes by integrating and improving the modeling, management, optimization, and operation of the daily-seasonal hydrogen storage and electrical storage. Its primary objective is to supply electricity and hydrogen to various consumers using solely renewable energy, even in the face of renewable energy fluctuations and outages. The model is mathematically expressed as a mixed integer linear optimization, implemented in GAMS software, and solved by the CPLEX solver. It aims at maximizing profit from selling electricity and hydrogen to the users. Results demonstrate that P2H and H2P units have a complementary operation with the solar system. When there is abundant solar energy, the P2H converts excess clean energy to green hydrogen and H2P operates when solar energy is not available. Seasonal storage also stores hydrogen from spring to autumn and discharges it in winter because of higher hydrogen prices in this season. Such an operation increases the annual profit by about 9%. When the hydroelectricity unit faces an outage in hours 8 to 13, the fuelcell uses the stored hydrogen and comes into operation to compensate hydropower outage. The net present value of profit amounts to $275,179 per year. The total hydrogen required is approximately 49,870 kg per year, with a total electricity requirement of 1190 MWh per year. The levelized revenue from hydrogen is achieved at around $4 per kilogram, while the levelized revenue from electricity is about $0.058 per kilowatt-hour. It is concluded that the integration of seasonal storage effectively reduces costs, boosts profits, and efficiently manages renewable energy fluctuations across different seasons. © 2024 Elsevier Ltd
Publication Date: 2024
Journal of Energy Storage (2352152X)83
In this paper, a centralized management mechanism is presented for cloud energy storage (CES), which is a new competitor to distributed energy storage (DES). In the CES, a central energy storage is installed by an investor and the consumers can rent portions of the CES capacity according to their needs. The investor's revenue includes the received rent from the consumers. In the proposed model, the investor of CES ensures that the annual cost of the consumers is less than the DES approach. The consumers are therefore encouraged to participate in the CES mechanism. IEEE 33-bus distribution network is assumed as a case study, and it is simulated under three cases: the network without storage, the network with DES approach, and the network with CES approach. The simulation results verify that the CES improves the well-being of the consumers compared to the DES approach. In the CES, the annual cost of the consumers decreases by 6 % and 4.48 % compared to cases 1 and 2, respectively. The return on investment is less than 3 years, with a projected lifespan of 10 years. The CES decreases the purchased power from the upstream network by 1.4 % compared to the DES. It is demonstrated that the renting cost of the CES services is between 49 % and 56 % of the investment cost in the DES approach. In addition, a conceptual comparison is made between CES and centralized energy storage (CENES) systems. Simulation results show that while investment cost is reduced by 6.1 % in the CENES approach, revenue and profit decrease by 35 % and 38 % respectively. The return on investment for CENES is approximately 44 months, whereas for CES, it is approximately 28 months. © 2024 Elsevier Ltd
Publication Date: 2024
Csee Journal Of Power And Energy Systems (20960042)10(2)pp. 786-796
In this paper, a DC microgrid (DCMG) integrated with a set of nano-grids (NG) is studied. DCMG exchanges predetermined active and reactive power with the upstream network. DCMG and NGs are coordinately controlled and managed in such a way the exchanged P-Q power with external grid are kept on scheduled level following all events and operating conditions. The proposed control system, in addition to the ability of mutual support between DCMG and NGs, makes NGs support each other in critical situations. On the other hand, in all operating conditions, DCMG not only feeds three-phase loads with time-varying active and reactive power on the grid side but also injects constant active power into the grid. During events, NGs support each other, NGs support DCMG, and DCMG supports NGs. Such control strategies are realized by the proposed control method to increase resilience of the system. For these purposes, all resources and loads in DCMG and NGs are equipped with individual controllers. Then, a central control unit analyzes, monitors, and regularizes performance of individual controllers in DCMG and NGs. Nonlinear simulations show the proposed model can effectively control DCMG and NGs under normal and critical conditions. © 2015 CSEE.
Publication Date: 2024
IEEE Transactions on Industrial Informatics (1551-3203)20(1)pp. 649-658
District energy systems (DESs) and integrated electricity-gas systems (IEGSs) are closely related. The performance of these systems in critical situations, such as faults and equipment outages, has not been adequately investigated. The operation of DESs may also be significantly affected by installing central generating systems for gas or electricity sectors. These central generating units may deal with outages and faults. In the literature, there is not a comprehensive model that considers renewables in IEGS, uncertainties of generating systems, a mutual connection between electricity and gas sub-grids, the ability to exchange power with the upstream grid, a centralized storage device for the electrical sector, and centralized power supply for the gas sector. All these points are considered and modeled in the proposed model. This article presents several multipurpose control strategies for DES that are designed and implemented on an IEGS. Electricity and thermal loads are used to model the DES energy needs. In the electricity subsystem, by using several local renewable energy sources (RESs) and a central battery, not only the electric loads are supplied, but also the DES can be connected to the upstream grid and trade the scheduled power in accordance with the electricity market contract in all normal and critical conditions. On the other hand, the gas subsystem is powered by a central fuel cell. Gas and electricity subsystems in the DES region are designed to assist each other during outages and events to increase resilience. All RESs, central batteries, and fuel cells are equipped with individual controllers to achieve the above-mentioned objectives. A centralized control framework is used to manage all these controllers under a variety of operating conditions. Numerical simulations in MATLAB software verify the model's ability to control DES and IEGS properly. © 2005-2012 IEEE.
Hemmati, R.,
Hemmati, R.,
Hemmati, R.,
Mehrjerdi, H.,
Mahdavi, S.,
Dehghanian, P.,
Hatamirad, A. Publication Date: 2024
Conference Record - Industrial and Commercial Power Systems Technical Conference (21584907)
In the recent years, the electric power system reinforcement against natural disasters has become one of the key challengers and concerns. The natural disasters, events and cyber-attacks are the most important challenges facing distribution networks causing widespread outages and blackouts. One of the useful techniques to cope with such problems is to utilize the microgrid formation strategy. This paper applies microgrid formation for load restoration and preventing voltage collapse. The given model enhances the system resilience following events. The proposed microgrid formation is developed by utilizing the tie-line breaker switches (BS). The IEEE 33-bus network is considered as case study and both the active-reactive powers are included in the power flow equation. The mixed integer linear planning (MILP) is used and the nonlinear equations are efficiently linearized. The results are presented under three cases including (i) without formation, (ii) formation without tie-lines, and (iii) formation with tie-lines. The numerical results demonstrate that the supplied loads in cases 1 to 3 are 57%, 64% and 71%, respectively. Therefore, the load restoration under cases 2 and 3 is increased by 7% and 14%, respectively. As well, the results illustrate that the proposed model not only improves the voltage profile but also reduces the generated power by DGs resulting in less environmental pollutions and costs. © 2024 IEEE.
Publication Date: 2023
Sustainable Cities and Society (2210-6707)98
In this paper, DC fast charging (DCFC) stations are integrated into the distribution network (DN). The designed DCFC stations are equipped with several charging devices (CDs) at different rated powers, which can charge electric vehicles (EVs) at various power levels through charging points (CPs). A central control system (CCS) is designed for each DCFC, which is applied for managing its local controllers. The CDs also use distributed energy storage (DES) alongside the DC chargers in order to increase the speed of the charging process and utilize the stored energy for improving the DN operation. The DN central controller scheme is as well designed to control the CCS of DCFCs and make positive effects on the upstream distribution grid. The CCS of DN, in addition to managing the CCS of DCFCs, is responsible for controlling the charge level of DCFCs according to four control strategies in each station including improving voltage fluctuations on the DN side, injecting reactive power from DCFCs to DN during a fault on the DN side, increasing DN resiliency by supplying critical loads in the time of upstream network outage, and supplying loads with time-varying active-reactive powers. The nonlinear simulations using MATLAB-SIMULINK demonstrate that the proposed strategies can effectively improve the performance of DN in addition to accurate control of the charging process in the EVs. © 2023 Elsevier Ltd
Publication Date: 2023
Energy (0360-5442)277
This paper addresses a novel multi-stage dynamic distribution network expansion planning (DNEP) taking into account the electric vehicle (EV) charging station based on the battery swapping model. The battery swapping station (BSS) is transferred seasonally and integrated to different buses in various seasons in order to defer the investment on the new lines. The BSS is as well integrated with rooftop solar panels. The uncertainties of loads and renewable energies are taken into account and handled by stochastic programming. The charging scheduling is optimized for all the batteries inside the BSS. A comparative study is presented for 3 cases including expansion planning without BSS, planning with a fixed location of BSS, and the proposed method (i.e., planning with seasonally transferred BSS). The numerical simulations demonstrate that the proposed model transfers the BSS every six months, where, it is installed on bus 25 in seasons 1 and 2, and on bus 17 in seasons 3 and 4. The congested lines such as lines 2 to 19, 16 to 17, and 6 to 7 are expanded by installing new lines in years 2, 4, and 5, respectively. The BSS sends power to the external grid in on-peak loading times such as hours 12 to 15 and 18 to 21. The proposed model reduces the planning cost by 5% compared to the expansion planning with a fixed location for BSS. © 2023 Elsevier Ltd
