Article
Engineering, Electrical & Electronic
Hamzeh Aljarajreh, Dylan Dah-Chuan Lu, Yam P. Siwakoti, Chi K. Tse
Summary: This article presents a new nonisolated three-port converter with reduced component count compared with existing reported topologies. The proposed converter has two bidirectional ports to accommodate applications requiring bidirectional power flow, and it is able to work in seven different modes of operation. Seamless transition, maximum power point tracking, battery protection and output voltage regulation are achieved.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Energy & Fuels
Abdulaziz Almutairi, Khairy Sayed, Naif Albagami, Ahmed G. Abo-Khalil, Hedra Saleeb
Summary: The paper introduces a new multi-port DC-DC power converter to address the intermittent nature and slow response of renewable energy applications. By combining renewable energy sources with statistical trends and integrating with energy storage systems, it can reduce the impact of intermittency and improve response speed. The proposed converter not only reduces system costs and size, improves efficiency and reliability, but also enhances the overall system dynamics.
Article
Computer Science, Information Systems
Sarbojit Mukherjee, Shib Sankar Saha, Sumana Chowdhury
Summary: This paper proposes a three-port soft-switched DC-DC converter that integrates solar photovoltaic (SPV) source, battery energy storage system (BESS), and DC load. The converter enhances the conventional phase-shifted full bridge (PSFB) DC-DC converter topology by adding a link inductor to create a three-port converter structure and using a secondary passive clamp circuit to minimize circulating current loss. The load port is isolated from the SPV and BESS port through a high frequency transformer. The converter utilizes closed loop controller for maximum power extraction, charge/discharge control, and load voltage regulation.
Article
Engineering, Electrical & Electronic
Tohid Jalilzadeh, Naghi Rostami, Ebrahim Babaei, Seyed Hossein Hosseini
Summary: The proposed converter is a dual-input DC-DC converter with bidirectional power flow, where one input is unidirectional and the other is a bidirectional port for a battery. It can combine two alternating sources with different characteristics and provide power to the load individually or simultaneously from each input source. Additionally, it has the capability to charge the battery and store energy returned from the output, making it suitable for electric vehicle applications.
IET POWER ELECTRONICS
(2021)
Article
Computer Science, Information Systems
Io-Wa Iam, Zhaoyi Ding, Zhicong Huang, Chi-Seng Lam, Rui P. P. Martins, Pui-In Mak
Summary: A rooftop photovoltaic (PV) system is an important solution for building-integrated centralized generation in the low-voltage DC grid. The drilling-free rooftop PV-inductive wireless power transfer (PV-IWPT) system can reduce installation and maintenance costs by eliminating physical cable connections and preventing thermal bridge breakage and rain penetration. However, achieving simultaneous MPPT for the PV panels and MEPT for the system under diverse irradiance conditions is challenging for the PV-IWPT system.
Article
Engineering, Electrical & Electronic
Sankarananth Sakthimani, Sivaraman Pandarinathan
Summary: The development of distributed renewable energy sources is gaining popularity for power production. The introduction of multi-port DC-DC converters has enabled effective power management and grid integration for various renewable energy sources. This study proposes a new soft switching control technique for a multi-port DC-DC converter to simultaneously support multiple renewable energy sources. Simulation studies demonstrate the effectiveness of the suggested converter in achieving maximum power point tracking (MPPT) for multiple photovoltaic panels.
ELECTRIC POWER COMPONENTS AND SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
V. Fernao Pires, Armando Cordeiro, Daniel Foito, J. Fernando Silva
Summary: This study proposes a new control strategy for a PV generator in islanded DC microgrids without storage systems. The strategy allows for smooth switching from maximum power point mode to voltage control regulation mode, limiting generated PV power when available power is excessive and returning to maximum power point operation when required. This cost-effective solution provides a viable alternative for rural and deprived regions.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Energy & Fuels
Bader N. Alajmi, Mostafa I. Marei, Ibrahim Abdelsalam, Mohamed F. AlHajri
Summary: A high-frequency multi-port direct current (DC) to DC converter for interfacing a photovoltaic (PV) system is proposed, capable of maximum power point tracking. The converter is compact and its performance is verified through detailed analysis and experimental setup.
Article
Automation & Control Systems
Jiangfeng Wang, Kai Sun, Cheng Xue, Tingting Liu, Yunwei Li
Summary: This research proposes a multiport dc-ac converter for battery energy storage system integrated photovoltaic systems, which can regulate most of the active power and use a differential power processing dc-dc converter to handle partial power. Additionally, a new cooperative control scheme and modified space vector pulsewidth modulation are investigated, achieving higher integration, efficiency, and lower cost.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Sandeep Reddy Kukunuru, Yashar Naeimi, Loai G. Salem
Summary: This article introduces a switched-photovoltaic (SPV) DC-DC converter that balances the voltages of photovoltaic (PV) cells and extracts maximum power under mismatch conditions. The converter utilizes the intrinsic capacitance of the PV cells to establish a switched-capacitor (SC) converter, allowing extra current from stronger cells to flow to the output. Experimental results show that the converter achieves a peak harvesting efficiency of 91.3%, demonstrating a 30.2% efficiency improvement over previous solutions.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2023)
Article
Engineering, Electrical & Electronic
Yizhan Zhuang, Fei Liu, Yanhui Huang, Zhouyang Liu, Shangzhi Pan, Xiaoming Zha, Jianbo Jiang
Summary: The study introduces a multiport modular dc-dc converter with a low-loss series LC power balancing unit to address the issue of output voltage imbalance in submodules caused by power mismatch in photovoltaics. By controlling the phase shift between different parts, maximum power point tracking and voltage balancing for SMs can be achieved.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Computer Science, Information Systems
Guanglin Sha, Qing Duan, Wanxing Sheng, Chunyan Ma, Caihong Zhao, Yao Zhang, Jiachen Tian
Summary: This paper proposes a DC transformer structure based on MMC and cascaded H-bridge for low-voltage DC distribution network system. Through analyzing different cases and control methods, the feasibility of the structure and control strategy is verified, with results consistent with theoretical analysis.
Article
Engineering, Electrical & Electronic
Jiangfeng Wang, Kai Sun, Dehong Zhou, Yunwei Li
Summary: A dual-dc-port dc-ac converter with virtual SVPWM is proposed for PV-battery hybrid systems, providing flexible power control between PV, battery, and the grid. The control scheme consists of an outer power loop and an inner virtual SVPWM, effectively considering the voltage variation of both PV and battery. Experimental results validate the effectiveness of the proposed solution in transferring all active power within a single conversion stage.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Kambiz Mohammadi Tanha, Vahid Abbasi, Kourosh Mohammadi
Summary: This paper proposes a multi-port DC-DC converter with three input ports and two output ports, extendable to three. The converter is designed based on the quadratic boost converter and has advantages such as flexible operations and appropriate voltage gain.
IET POWER ELECTRONICS
(2022)
Article
Energy & Fuels
Sheila Safaee, Abbas Ketabi, Mohammad Farshadnia, Mohammad Shahidehpour
Summary: This article presents a novel multi-port modular multilevel inverter topology for grid-connected photovoltaic systems, featuring smaller capacitor size. The proposed topology allows modularity and expansion for PV integration, with independent maximum power point tracking controllers for optimized energy extraction. A model-predictive control scheme minimizes circulating currents and balances capacitor voltages, maintaining THD within limits for injected solar power into the grid. Performance validation under various radiation conditions indicates desirable operation of the proposed multi-port MMC topology.
ENERGY SCIENCE & ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Jiawei Zhao, Daolian Chen, Jiahui Jiang
Summary: A novel transformerless dc-dc boost converter is proposed in this paper, which can increase the voltage gain without limiting the duty cycle or increasing the voltage and current stresses of the power switches. Experimental results confirm the performance of the proposed converter.
IET POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Jiahui Jiang, Tao Zhang, Daolian Chen
Summary: The study introduces a novel scheme based on DPP, which achieves true DMPPT through multiple buck-boost choppers and MPO algorithm, effectively improving the efficiency of the PV system.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Jian Li, Daolian Chen, Jiahui Jiang
Summary: This paper proposes a single-phase zero-voltage switching quasi-Z-source inverter with a high voltage gain and conducts in-depth analysis of key technologies. Experimental results verify that the proposed inverter has high conversion efficiency, high output power quality, and strong load adaptability, showing promising prospects for application.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Energy & Fuels
Chuanyu Zhang, Chuanxu Cao, Ruiqi Chen, Jiahui Jiang
Summary: Single-phase inverters are commonly used in renewable energy applications, but their inherent 2?-ripple power can have significant effects on system performance. To mitigate this issue, a three-leg quasi-Z-source inverter (QZSI) and a control strategy are proposed. The QZSI includes a quasi-Z-source network, an H-Bridge inverter, and an active power filter. The control strategy consists of three loops: open-loop simple boost control, output voltage control, and 2?-ripple suppression control. Simulation results demonstrate the effectiveness of the proposed approach in reducing input ripple and improving system stability.
Article
Engineering, Electrical & Electronic
Daolian Chen, Jiahui Jiang, Yishi Su
Summary: A forward-type single-stage multi-input inverter with series-time-overlapping power supply is proposed in this paper. The circuit structure, energy management control strategy, high-frequency switching process analysis, power decoupling, and common mode interference suppression are fully studied. The designed 3-kVA inverter prototype demonstrates excellent performances in terms of power conversion, electrical isolation, efficiency, size, weight, duty cycle adjustment range, waveform quality, and load adaptability.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Hongbiao Xie, Fenghuang Cai, Jiahui Jiang, Dongfang Li
Summary: This article proposes a new triple-phase shift modulation scheme based on frequency-domain fundamental harmonic analysis (FDFHA) to improve the efficiency of the dual active bridge (DAB) converter in the low- and medium-power ranges. By optimizing the rms current as the target, the optimal operating point is found and a control strategy with a simple controller structure is established, showing excellent dynamic performance. Experimental results demonstrate that the proposed scheme can significantly reduce the rms current in the low- and medium-power ranges and achieve a wider zero-voltage switching (ZVS) range.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2023)
Article
Engineering, Electrical & Electronic
Fenghuang Cai, Mingsong Zhan, Qinqin Chai, Jiahui Jiang
Summary: This article analyzes the fault operation mode of the Dual-active-bridge (DAB) converter and proposes a fault diagnosis strategy based on adaptive threshold denoising for residual networks. The method improves the network's learning ability and adaptive denoising capability through an improved channel attention module and threshold algorithm.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Computer Science, Information Systems
Jiawei Zhao, Daolian Chen, Jiahui Jiang
Summary: A novel hybrid Z-source dc-dc converter with high step-up capability and low device voltage stress has been proposed in this article, demonstrating its unique advantages compared to conventional boost converters. The converter's performance has been verified with a prototype circuit in the laboratory, confirming its high boost capacity.
Article
Green & Sustainable Science & Technology
Cameron Bracken, Nathalie Voisin, Casey D. Burleyson, Allison M. Campbell, Z. Jason Hou, Daniel Broman
Summary: This study presents a methodology and dataset for examining compound wind and solar energy droughts, as well as the first standardized benchmark of energy droughts across the Continental United States (CONUS) for a 2020 infrastructure. The results show that compound wind and solar droughts have distinct spatial and temporal patterns across the CONUS, and the characteristics of energy droughts are regional. The study also finds that compound high load events occur more often during compound wind and solar droughts than expected.
Article
Green & Sustainable Science & Technology
Ning Zhang, Yanghao Yu, Jiawei Wu, Ershun Du, Shuming Zhang, Jinyu Xiao
Summary: This paper provides insights into the optimal configuration of CSP plants with different penetrations of wind power by proposing an unconstrained optimization model. The results suggest that large solar multiples and TES are preferred in order to maximize profit, especially when combined with high penetrations of wind and photovoltaic plants. Additionally, the study demonstrates the economy and feasibility of installing electric heaters (EH) in CSP plants, which show a linear correlation with the penetration of variable energy resources.
Article
Green & Sustainable Science & Technology
M. Szubel, K. Papis-Fraczek, S. Podlasek
Article
Green & Sustainable Science & Technology
J. Silva, J. C. Goncalves, C. Rocha, J. Vilaca, L. M. Madeira
Summary: This study investigated the methanation of CO2 in biogas and compared two different methanation reactors. The results showed that the cooled reactor without CO2 separation achieved a CO2 conversion rate of 91.8%, while the adiabatic reactors achieved conversion rates of 59.6% and 67.2%, resulting in an overall conversion rate of 93.0%. Economic analysis revealed negative net present worth values, indicating the need for government monetary incentives.
Article
Green & Sustainable Science & Technology
Yang Liu, Yonglan Xi, Xiaomei Ye, Yingpeng Zhang, Chengcheng Wang, Zhaoyan Jia, Chunhui Cao, Ting Han, Jing Du, Xiangping Kong, Zhongbing Chen
Summary: This study investigated the effect of using nanofiber membrane composites containing Prussian blue-like compound nanoparticles (PNPs) to relieve ammonia nitrogen inhibition of rural organic household waste during high-solid anaerobic digestion and increase methane production. The results showed that adding NMCs with 15% PNPs can lower the concentrations of volatile fatty acids and ammonia nitrogen, and increase methane yield.
Article
Green & Sustainable Science & Technology
Zhong Ge, Xiaodong Wang, Jian Li, Jian Xu, Jianbin Xie, Zhiyong Xie, Ruiqu Ma
Summary: This study evaluates the thermodynamic, exergy, and economic performance of a double-stage organic flash cycle (DOFC) using ten eco-friendly hydrofluoroolefins. The influences of key parameters on performance are analyzed, and the advantages of DOFC over single-stage type are quantified.
Article
Green & Sustainable Science & Technology
Nicolas Kirchner-Bossi, Fernando Porte-Agel
Summary: This study investigates the optimization of power density in wind farms and its sensitivity to the available area size. A novel genetic algorithm (PDGA) is introduced to optimize power density and turbine layout. The results show that the PDGA-driven solutions significantly reduce the levelized cost of energy (LCOE) compared to the default layout, and exhibit a convex relationship between area and LCOE or power density.
Article
Green & Sustainable Science & Technology
Chunxiao Zhang, Dongdong Li, Lin Wang, Qingpo Yang, Yutao Guo, Wei Zhang, Chao Shen, Jihong Pu
Summary: In this study, a novel reversible liquid-filled energy-saving window that effectively regulates indoor solar radiation heat gain is proposed. Experimental results show that this window can effectively reduce indoor temperature during both summer and winter seasons, while having minimal impact on indoor illuminance.
Article
Green & Sustainable Science & Technology
Alessandro L. Aguiar, Martinho Marta-Almeida, Mauro Cirano, Janini Pereira, Leticia Cotrim da Cunha
Summary: This study analyzed the Brazilian Equatorial Shelf using a high-resolution ocean model and found significant tidal variations in the area. Several hypothetical barrages were proposed with higher annual power generation than existing barrages. The study also evaluated the installation effort of these barrages.
Article
Green & Sustainable Science & Technology
Francesco Superchi, Nathan Giovannini, Antonis Moustakis, George Pechlivanoglou, Alessandro Bianchini
Summary: This study focuses on the optimization of a hybrid power station on the Tilos island in Greece, aiming to increase energy export and revenue by optimizing energy fluxes. Different scenarios are proposed to examine the impact of different agreements with the grid operator on the optimal solution.
Article
Green & Sustainable Science & Technology
Peimaneh Shirazi, Amirmohammad Behzadi, Pouria Ahmadi, Sasan Sadrizadeh
Summary: This research presents two novel energy production/storage/usage systems to reduce energy consumption and environmental effects in buildings. A biomass-fired model and a solar-driven system integrated with photovoltaic thermal (PVT) panels and a heat pump were designed and assessed. The results indicate that the solar-based system has an acceptable energy cost and the PVT-based system with a heat pump is environmentally superior. The biomass-fired system shows excellent efficiency.
Article
Green & Sustainable Science & Technology
Zihao Qi, Yingling Cai, Yunxiang Cui
Summary: This study aims to investigate the operational characteristics of the solar-ground source heat pump system (SGSHPS) in Shanghai under different operation modes. It concludes that tandem operation mode 1 is the optimal mode for winter operation in terms of energy efficiency.
Article
Green & Sustainable Science & Technology
L. Bartolucci, S. Cordiner, A. Di Carlo, A. Gallifuoco, P. Mele, V. Mulone
Summary: Spent coffee grounds are a valuable biogenic waste that can be used as a source of biofuels and valuable chemicals through pyrolysis and solvent extraction processes. The study found that heavy organic bio-oil derived from coffee grounds can be used as a carbon-rich biofuel, while solvent extraction can extract xantines and p-benzoquinone, which are important chemicals for various industries. The results highlight the promising potential of solvent extraction in improving the economic viability of coffee grounds pyrolysis-based biorefineries.
Article
Green & Sustainable Science & Technology
Luiza de Queiroz Correa, Diego Bagnis, Pedro Rabelo Melo Franco, Esly Ferreira da Costa Junior, Andrea Oliveira Souza da Costa
Summary: Building-integrated photovoltaics, especially organic solar technology, are important for reducing greenhouse gas emissions in the building sector. This study analyzed the performance of organic panels laminated in glass in a vertical installation in Latin America. Results showed that glass lamination and vertical orientation preserved the panels' performance and led to higher energy generation in winter.
Article
Green & Sustainable Science & Technology
Zhipei Hu, Shuo Jiang, Zhigao Sun, Jun Li
Summary: This study proposes innovative fin arrangements to enhance the thermal performance of latent heat storage units. Through optimization of fin distribution and prediction of transient melting behaviors, it is found that fin structures significantly influence heat transfer characteristics and melting behaviors.