Article
Energy & Fuels
Nicholas Etherden, Mouaz Alhamwi
Summary: By analyzing inverter voltage measurements from millions of online PV inverters, the grid impact of PV can be assessed, which is particularly important for distributed solar due to an information unbalance between grid operators and users. Monitoring the voltage impact can help detect local saturation effects and optimize grid investments.
Article
Energy & Fuels
Furkan Ahmad, Mohd Khalid, Bijaya Ketan Panigrahi
Summary: This study proposes a comprehensive framework to optimally place solar-powered charging stations in a distribution network, aiming to improve voltage profile, minimize power loss, and reduce cost. The methodology involves a stochastic approach to predict EV load demand and a Feed-forward neural network to evaluate solar power from PV plants. The impact of EV load demand on the distribution network is explored, and an improved chicken swarm optimization method is used to optimize charging station placement in the IEEE 33 bus system, proving its dominance over other algorithms.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Green & Sustainable Science & Technology
Feifei Bai, Ruifeng Yan, Tapan Kumar Saha, Daniel Eghbal
Summary: The article proposes a novel method based on line-to-line voltage sensitivity and time series evaluation to quantify the interactions between PV/load fluctuations and tap operations. The accuracy of this method is verified with measured data from a real-life unbalanced distribution network with high PV penetration. This method is further used to statistically quantify the causes of excessive tap operations with half-year field data under the support of the local utility and the PV plant owner, providing valuable insights for utilities to manage voltage profiles and tap maintenance for remote distribution networks with high PV penetration.
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
(2021)
Review
Energy & Fuels
Dazhi Yang, Weixing Li, Gokhan Mert Yagli, Dipti Srinivasan
Summary: This study identifies four technical aspects of solar forecasting that are often overlooked: gauging forecast quality, quantifying predictability, forecast downscaling, and hierarchical forecasting. The challenges associated with these aspects are discussed in conjunction with industry standards issued by the National Energy Administration of China.
Article
Engineering, Electrical & Electronic
Lingling Fan, Zhixin Miao
Summary: This paper explains why solar PV inverters may experience more severe overvoltage compared to the measurement point (POM), and presents a quantitative analysis to explain the overvoltage mechanism.
ELECTRIC POWER SYSTEMS RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Lingling Fan, Zhixin Miao, Miao Zhang
Summary: The study found that solar photovoltaic inverters in South California experienced subcycle overvoltage after grid disturbances, mainly due to the inherent LC dynamics caused by shunt compensation and grid inductance, as well as the excitation of overvoltage dynamics by momentary cessation.
IEEE TRANSACTIONS ON POWER DELIVERY
(2021)
Article
Engineering, Multidisciplinary
K. C. Bevin, Ashu Verma, Sumit K. Chattopadhyay
Summary: This article introduces a new device called flexible step-voltage regulator (FSVR) for unbalanced distribution networks. Compared to the traditional step-voltage regulator (SVR), FSVR can independently control both voltage magnitude and phase angle for each phase, providing greater flexibility. Simulation studies on IEEE 13 bus and IEEE 34 bus test networks demonstrate the effectiveness of FSVR in reducing power losses and voltage imbalance. A scaled-down model of FSVR is designed in the lab to demonstrate its feasibility.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2022)
Article
Energy & Fuels
Hyun-ok Lee, Dae-Jin Kim, Chun-Sung Kim, Byungki Kim
Summary: This paper presents a voltage control method for a step voltage regulator by considering the output voltage of an under-load tap changer and the reverse power flow from a renewable energy source. It proposes an optimal control method to determine the compensation rate for the step voltage regulator, overcoming the limitations of existing voltage control methods.
Article
Energy & Fuels
Thanh Son Tran, Minh Phap Vu, Manh-Hai Pham, Phuc-Huy Nguyen, Duc-Tuyen Nguyen, Duc-Quang Nguyen, Anh Tung Tran, Hoang-Anh Dang
Summary: Vietnam has rapidly developed solar power in recent years, but integrating solar power systems into the distribution grid can have a significant impact on grid voltage. Thus, it is necessary to study the impact of rooftop solar power on the distribution grid and incorporate actual operating data for a more detailed assessment and reliability analysis. This study analyzed the influence of rooftop solar power on a low voltage distribution grid in Ha Tinh province, Vietnam, using ETAP software, and proposed a synthetic solution involving reactive power compensation and load tap adjustment to improve voltage and reduce power loss on the grid.
Article
Green & Sustainable Science & Technology
Lingling Fan, Zhixin Miao, David Piper, Deepak Ramasubramanian, Lin Zhu, Parag Mitra
Summary: Low-frequency oscillations at 0.1 Hz have been observed in voltage and var in practical solar photovoltaic systems, and this letter provides an explanation for their formation. Three critical factors leading to the oscillations are identified: communication delay between plant-level and inverter-level control, high volt/var sensitivity at high power exporting levels, and the volt-var feedback system involving plant control, inverter control, and grid impact. Additionally, the critical feature of the 0.1 Hz oscillation is explained, which is the absence of oscillations in real power.
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
(2023)
Article
Engineering, Electrical & Electronic
Mehmet Tan Turan, Erdin Gokalp
Summary: The increasing integration of renewable energy and new generation consumers requires modifications and upgrades to the existing grid infrastructure. Necessary analyses for optimal integration criteria are essential to ensure grid stability and optimal integration of renewables. Two-way power flows and variable power production of renewables must be considered for system design during the integration phase.
JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Construction & Building Technology
Karsten Voss, Isil Kalpkirmaz Rizaoglu, Andrea Balcerzak, Heiko Hansen
Summary: The Solar Decathlon is an international competition for universities to design, build, and operate solar-powered houses. It provides a platform for interdisciplinary teaching, learning, and research. In 2022, the European edition of the competition was held in Germany with a focus on the development of European cities and residential apartment buildings. A total of 18 teams from 11 countries participated, showcasing energy efficiency and solar energy use in innovative architectural concepts.
ENERGY AND BUILDINGS
(2023)
Article
Energy & Fuels
Anju Yadav, Nand Kishor, Richa Negi
Summary: This study focuses on determining the impact of solar radiation profiles and load changes on the placement, size, voltage violations, and curtailment cost of PV generation in a network. The study optimizes PV installation using yearly solar radiation profiles for three different locations. It considers multiple phases and allows for the installation of single- and three-phase PV systems. The research analyzes the optimal placement and size of PV inverters for different load changes in one or all three phases. Results show that the distribution of PVs remains non-uniform for low solar radiation profiles but becomes more uniform for medium and high radiation. Furthermore, voltage violations occur at both load-connected and non-load-connected buses, particularly at feeder end buses with single-phase PV installation.
Article
Engineering, Electrical & Electronic
Goran Svenda, Zoran Simendic
Summary: This paper presents an adaptive on-load tap-changing voltage control (AVC) for active distribution networks (DN) with distributed generators (DGs) and customers on different feeders, correcting the false image of DN load without the need for expensive upgrades.
ELECTRICAL ENGINEERING
(2022)
Article
Automation & Control Systems
Arup Ratan Paul, Arghyadip Bhattacharya, Kishore Chatterjee
Summary: This article proposes a transformerless micro inverter based on SEPIC-Cuk topology, capable of connecting a 35V, 250W solar PV module to a single-phase 220-230V AC grid. By utilizing one high-frequency switch and four line-frequency switches, the circuit reduces switching losses, thus enhancing system reliability. The circuit operates in discontinuous conduction mode (DCM) under all operating conditions, achieving high gain with negligible turn on loss for the high-frequency switch. Detailed analysis and simulation studies confirm the effectiveness of the proposed scheme, while experimental studies of a 250W laboratory prototype validate its viability.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Energy & Fuels
Matthew Lave, Joshua Stein, Ryan Smith
JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME
(2016)
Article
Energy & Fuels
Jay Johnson, Jason C. Neely, Jarod J. Delhotal, Matthew Lave
IEEE JOURNAL OF PHOTOVOLTAICS
(2016)
Article
Energy & Fuels
Matthew Lave, Robert J. Broderick, Matthew J. Reno
Article
Green & Sustainable Science & Technology
Matthew Lave, Matthew J. Reno, Jouni Peppanen
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
(2019)
Article
Energy & Fuels
C. Birk Jones, Matthew Lave, Matthew J. Reno, Rachid Darbali-Zamora, Adam Summers, Shamina Hossain-McKenzie
Article
Energy & Fuels
C. Birk Jones, Matthew Lave, William Vining, Brooke Marshall Garcia
Summary: The study simulated the impact of EV charging on distribution electric power systems, showing modest voltage impacts but a noticeable increase in line loading of about 15%. Different types of feeders experience slight shifts in peak load times.
Article
Green & Sustainable Science & Technology
Melvin Lugo-Alvarez, Jan Kleissl, Adil Khurram, Matthew Lave, C. Birk Jones
Summary: This paper develops a systematic procedure to address the engineering challenge of reducing the duration and frequency of blackouts in remote communities by creating microgrids and prioritizing high value assets within vulnerable communities. The study uses nighttime satellite imagery to identify vulnerable communities, and employs an asset classification and rating system to prioritize multi-asset clusters within these communities. Infrastructure data, geographic information systems, satellite imagery, and spectral clustering are utilized to form and rank microgrid candidates, with a microgrid sizing algorithm included to guide the design process.
JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY
(2022)
Article
Energy & Fuels
C. Birk Jones, Cynthia J. Bresloff, Rachid Darbali-Zamora, Matthew S. Lave, Erick E. Aponte Bezares
Summary: Limited access to transmission lines after a major contingency event can hinder restoration efforts. This paper proposes a methodology that utilizes GIS data and graph theory analysis to assess infrastructure and identify hard-to-reach areas due to natural risks or distance to roads.
IEEE OPEN ACCESS JOURNAL OF POWER AND ENERGY
(2022)
Article
Computer Science, Information Systems
C. Birk Jones, Marios Theristis, Rachid Darbali-Zamora, Michael E. Ropp, Matthew J. Reno, Matthew S. Lave
Summary: The proposed approach aims to minimize the Loss of Load Probability by finding ideal switch locations to connect distant PV systems with critical loads in a microgrid setup.
Proceedings Paper
Green & Sustainable Science & Technology
Matthew Lave, Rob Hovsapian
2018 IEEE 7TH WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION (WCPEC) (A JOINT CONFERENCE OF 45TH IEEE PVSC, 28TH PVSEC & 34TH EU PVSEC)
(2018)
Proceedings Paper
Green & Sustainable Science & Technology
William B. Hobbs, Matthew Lave, Christopher Smitherman
2018 IEEE 7TH WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION (WCPEC) (A JOINT CONFERENCE OF 45TH IEEE PVSC, 28TH PVSEC & 34TH EU PVSEC)
(2018)
Proceedings Paper
Energy & Fuels
Matthew Lave, Clifford Hansen, Yuzuru Ueda, Keiichiro Hakuta
2016 IEEE 43RD PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2016)
Proceedings Paper
Energy & Fuels
Matthew Lave, Jimmy Quiroz, Matthew J. Reno, Robert J. Broderick
2016 IEEE 43RD PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2016)
Proceedings Paper
Energy & Fuels
Matthew Lave, Abraham Ellis
2016 IEEE 43RD PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2016)
Proceedings Paper
Energy & Fuels
Matthew J. Reno, Matthew Lave, Jimmy E. Quiroz, Robert J. Broderick
2016 IEEE 43RD PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2016)
Article
Energy & Fuels
Siddharth Sradhasagar, Omkar Subhasish Khuntia, Srikanta Biswal, Sougat Purohit, Amritendu Roy
Summary: In this study, machine learning models were developed to predict the bandgap and its character of double perovskite materials, with LGBMRegressor and XGBClassifier models identified as the best predictors. These models were further employed to predict the bandgap of novel bismuth-based transition metal oxide double perovskites, showing high accuracy, especially in the range of 1.2-1.8 eV.
Article
Energy & Fuels
Wei Shuai, Haoran Xu, Baoyang Luo, Yihui Huang, Dong Chen, Peiwang Zhu, Gang Xiao
Summary: In this study, a hybrid model based on numerical simulation and deep learning is proposed for the optimization and operation of solar receivers. By applying the model to different application scenarios and considering multiple performance objectives, small errors are achieved and optimal structure parameters and heliostat scales are identified. This approach is not only applicable to gas turbines but also heating systems.
Article
Energy & Fuels
Mubashar Ali, Zunaira Bibi, M. W. Younis, Muhammad Mubashir, Muqaddas Iqbal, Muhammad Usman Ali, Muhammad Asif Iqbal
Summary: This study investigates the structural, mechanical, and optoelectronic properties of the BaCuF3 fluoroperovskite using the first-principles modelling approach. The stability and characteristics of different cubic structures of BaCuF3 are evaluated, and the alpha-BaCuF3 and beta-BaCuF3 compounds are found to be mechanically stable with favorable optical properties for solar cells and high-frequency UV applications.
Article
Energy & Fuels
Dong Le Khac, Shahariar Chowdhury, Asmaa Soheil Najm, Montri Luengchavanon, Araa mebdir Holi, Mohammad Shah Jamal, Chin Hua Chia, Kuaanan Techato, Vidhya Selvanathan
Summary: A novel recycling system is proposed in this study to decompose and reclaim the constituent materials of organic-inorganic perovskite solar cells (PSCs). By utilizing a one-step solution process extraction approach, the chemical composition of each layer is successfully preserved, enabling their potential reuse. The proposed recycling technique helps mitigate pollution risks, minimize waste generation, and reduce recycling costs.
Article
Energy & Fuels
Peijie Lin, Feng Guo, Xiaoyang Lu, Qianying Zheng, Shuying Cheng, Yaohai Lin, Zhicong Chen, Lijun Wu, Zhuang Qian
Summary: This paper proposes an open-set fault diagnosis model for PV arrays based on 1D VoVNet-SVDD. The model accurately diagnoses various types of faults and is capable of identifying unknown fault types.