Article
Green & Sustainable Science & Technology
Shravan Kumar Singh, Nikhil Chander
Summary: This study presents a mid-life degradation evaluation of a 100 kWp solar photovoltaic power plant after eleven years of operation. Visual inspections and measurement of current-voltage data were conducted to identify the extent of degradation and power deviation in the PV modules. The study found significant visual degradation including discoloration, cracks, burn marks, and lightning damage, as well as variations in power degradation rate. This research provides a better understanding of the degradation types affecting PV modules in the composite climate regions of east-central India.
Article
Energy & Fuels
Hussain Al Mahdi, Paul G. Leahy, Alan P. Morrison
Summary: It has been discovered that a decrease in shunt resistance can result in the degradation and failure of solar modules over time. This paper presents a method to identify degradation before it becomes critical by analyzing the effects of reduced shunt resistance on the current-voltage characteristics of a PV cell. By artificially lowering the shunt resistance of five commercial polycrystalline solar cell samples and measuring their I-V characteristics, the impact on maximum power output, short-circuit current, open-circuit voltage, and fill factor was analyzed. Linear models were developed to establish the relationship between reduction in shunt resistance and Pmax and VOC. These findings propose that these relationships can serve as strong predictors and observers of shunt resistance degradation and can be implemented in online monitoring systems for operational PV modules.
Article
Computer Science, Interdisciplinary Applications
Nicolas Langrene, Xavier Warin
Summary: This article revisits the efficient computation of empirical cumulative distribution functions on large, multivariate datasets, proposing two fast and accurate methods. Additionally, a direct connection between cumulative distribution functions and kernel density estimation is established, paving the way for fast algorithms in multivariate kernel estimation and regression.
COMPUTATIONAL STATISTICS & DATA ANALYSIS
(2021)
Article
Energy & Fuels
Cara Libby, Bijaya Paudyal, Xin Chen, William B. Hobbs, Daniel Fregosi, Anubhav Jain
Summary: This study compared the power loss of photovoltaic modules that underwent different accelerated aging tests. The results showed that fill factor loss was the cause of power output decrease during aging tests, while both open circuit voltage and fill factor contributed to power loss during subsequent testing.
IEEE JOURNAL OF PHOTOVOLTAICS
(2023)
Article
Energy & Fuels
Michelle Kitayama da Silva, Mehreen Saleem Gul, Hassam Chaudhry
Summary: This study reviews the degradation factors of conventional monofacial and bifacial photovoltaic modules, finding that microcracking, encapsulant discoloration, and light induced degradation have similar effects on both, while potential induced degradation affects bifacial modules more. Additionally, bifacial modules have a slower degradation rate compared to monofacial modules under different solar radiation conditions.
Article
Energy & Fuels
Bhogula Navothna, Sandhya Thotakura
Summary: This article presents a detailed analysis of the performance, rate of degradation, and power and energy loss of a 1 MWp scale solar photovoltaic plant in the coastal region of Andhra Pradesh, India. The predicted result provides an estimate for optimal functioning of the PV plant.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
N. Belhaouas, F. Mehareb, E. Kouadri-Boudjelthia, H. Assem, S. Bensalem, F. Hadjrioua, A. Aissaoui, H. Hafdaoui, A. Chahtou, K. Bakria, D. Saheb-Koussa
Summary: This paper analyzes the degradation performance of monocrystalline silicon PV modules exposed outdoor for eleven years in Bouzareah city, northern Algeria under Mediterranean climate conditions. The results show that the PV modules suffer mainly from optical failures, leading to reductions in electrical parameters and influence on temperature coefficients.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Chemistry, Multidisciplinary
Carlos Montes, Roberto Dorta-Guerra, Benjamin Gonzalez-Diaz, Sara Gonzalez-Perez, Luis Ocana, Elena Llarena
Summary: This study assessed the evolution of the performance ratio (PR) of a utility-scale photovoltaic (PV) installation in a subtropical climate. By using linear mixed effects models (LME), the study found that the nominal power and location factors have a significant impact on the PR.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Xiaoguang Diao, Fei Liu, Yuan Song, Mengyue Xu, Yizhan Zhuang, Wenkun Zhu, Xiaoming Zha
Summary: This article introduces a new efficient bidirectional T-source circuit breaker, which reduces ON-state loss by more than 40% compared to existing circuit breakers, and has manual turn off and soft-starting capabilities.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Nan-Nan Zhao, Yi Zhang, Meng-Qi Liu, Yin Peng, Jin-Yun Liu
Summary: A two-dimensional (2D)-2D WO3-Bi2WO6 photocatalyst with outstanding photocatalytic activity in reducing Cr(vi) is developed. The enhanced performance is attributed to the synergistic effect of the 2D-2D heterostructure and the S-scheme transfer behavior of photogenerated electrons and holes.
Article
Chemistry, Multidisciplinary
Lisamoni Kalita, Karanika Sonowal, Purashri Basyach, Biswajit Saha, Lakshi Saikia
Summary: Various one-dimensional and three-dimensional CdS@CeO2 nanocomposites were synthesized via a solvothermal route. A nanoflower-shaped CdS@CeO2 nanocomposite was selected as a model catalyst and used as a luminescent sensor for Cr(VI) detection in water. Good linear quenching was observed in the range of 0-0.5 μM with a detection limit of 0.04 μM. The catalyst exhibited a quantum yield of 73% and showed high selectivity towards Cr(VI). In addition, it demonstrated efficient photocatalytic activity for the oxidation of benzylamine.
Article
Green & Sustainable Science & Technology
Neha Bansal, Shiva Pujan Jaiswal, Gajendra Singh
Summary: This study provides a detailed assessment of degradation and reliability of PV modules installed in a 5 MW grid-tied solar PV plant in a hot semi-arid climate. The defects and failures of 336 visually inspected c-Si modules with 10 years of operational period were evaluated using the FMECA statistical tool and I-V curve measurement. The research presents long-term degradation analysis of PV modules in a utility-scale plant installed for 10 years in an outdoor environment, along with electrical characterization. The identified defects and failures were correlated with the electrical parameters of the PV module. The study highlights the most dominant and frequently occurring defects and failures, such as EVA discoloration, snail trails, and backsheet damage, and emphasizes the importance of degradation investigation and mitigation measures.
ENERGY FOR SUSTAINABLE DEVELOPMENT
(2022)
Article
Green & Sustainable Science & Technology
Muhammad Farooq Azam, Nadia Shahzad, Arslan Rafique, Mudassar Ayub, Hassan Abdullah Khalid, Adeel Waqas
Summary: Ethylene vinyl acetate (EVA) is commonly used in photovoltaic module fabrication but is susceptible to degradation from UV-light. This study aims to investigate the degradation of electrical parameters in PV-modules under UV-light and temperature influence and proposes the use of poly vinyl butyral (PVB) as an alternative encapsulant. Four PV-modules with different combinations of encapsulants and glass sheets were subjected to an accelerated UV stress test, and various tests were performed to characterize the modules intermittently. The results showed that PVB/soda-lime experienced the lowest 3% loss in maximum power (Pmax), while EVA/quartz experienced the highest 7% loss.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Engineering, Electrical & Electronic
Sara Bouguerra, Mohamed Redha Yaiche, Oussama Gassab, Ariya Sangwongwanich, Frede Blaabjerg
Summary: The lifetime of a photovoltaic inverter is influenced by factors such as solar irradiance and ambient temperature at the installation site. This study evaluated the impact of different tilt and orientation angles of PV panels on the inverter lifetime, showing that certain orientations can result in higher energy production and longer inverter lifespan. Additionally, the aging of PV panels in Algeria significantly affects the estimation of inverter lifetime for different orientations.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Mahmoud Dhimish, Ghadeer Badran
Summary: This article presents an electronic circuit that mitigates the impact of PID in PV modules. The circuit improves electroluminescence regeneration, increases output power, reduces hotspot temperature, and achieves PID recovery within 15 days.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Automation & Control Systems
Omid Beik, Nigel Schofield
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2018)
Article
Engineering, Electrical & Electronic
Zipan Nie, Nigel Schofield
IET ELECTRIC POWER APPLICATIONS
(2019)
Article
Energy & Fuels
Dawei Chen, Wangqiang Niu, Wei Gu, Nigel Schofield
Article
Green & Sustainable Science & Technology
Yiheng Hu, Nigel Schofield, Laolu Obafemi Shobayo, Nan Zhao
IET RENEWABLE POWER GENERATION
(2020)
Article
Engineering, Electrical & Electronic
Nan Zhao, Nigel Schofield
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2020)
Article
Energy & Fuels
Mahmoud Dhimish, Yihua Hu, Nigel Schofield, G. Romenia Vieira
Article
Chemistry, Physical
Mahmoud Dhimish, Nigel Schofield
Summary: The paper introduces a single-switch unidirectional buck-boost dc-dc converter for solar PV and fuel cell applications, achieving high efficiency and wide input voltage range. With a limited number of passive components and specific topology, the converter enables continuous power flow control and maintains stability of inductance current and output voltage under different conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Mechanical
Manan'Iarivo Louis Rasolonjanahary, Chris Bingham, Nigel Schofield, Masoud Bazargan
Summary: The paper proposes a charging priority method based on model predictive control, which enables real-time priority charge scheduling for multiple charging bays. The priority is determined based on the level of charge required and premiums, allowing control of charging operations during peak energy demand. The method also facilitates participation in Demand Side Response schemes by temporarily reducing current during charging.
Article
Engineering, Multidisciplinary
Noass Kunstbergs, Hartmut Hinz, Nigel Schofield, Dennis Roll
Summary: Fuel cell hybrid vehicles, as an alternative to battery electric vehicles, may become more important in the future. A bidirectional DC-DC converter with compact non-isolated design is needed to overlap the voltage of the fuel cell stack and traction battery. This study investigates a non-isolated hard-switched bidirectional cascaded buck and boost converter for fuel cell hybrid vehicles, achieving high efficiency and low device junction temperatures through switching frequency modulation and optimum fixed duty cycle.
Proceedings Paper
Green & Sustainable Science & Technology
Noass Kunstbergs, Hartmut Hinz, Nigel Schofield
Summary: This paper compares DC-DC converters with Si and SiC power semiconductors without considering the optimal switching frequency in terms of efficiency, volume, and costs. Using an iterative design procedure, the optimum switching frequency for bidirectional DC-DC converters based on Si-IGBTs and SiC-MOSFETs is determined, showing that Si-IGBTs have lower efficiency losses at a certain operating point compared to SiC-MOSFETs.
2021 POWER SYSTEM AND GREEN ENERGY CONFERENCE (PSGEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Juan Melecio, A. Mohammed, Nigel Schofield, S. Djurovic
2019 IEEE INTERNATIONAL ELECTRIC MACHINES & DRIVES CONFERENCE (IEMDC)
(2019)
Proceedings Paper
Energy & Fuels
Nan Zhao, Nigel Schofield
2019 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)
(2019)
Proceedings Paper
Energy & Fuels
Yiheng Hu, Xihai Cao, Nigel Schofield, Nan Zhao
2019 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)
(2019)
Proceedings Paper
Computer Science, Hardware & Architecture
Ayman Attya, Nigel Schofield, Mahmoud Dhimish
2018 IEEE PES INNOVATIVE SMART GRID TECHNOLOGIES CONFERENCE EUROPE (ISGT-EUROPE)
(2018)
