Article
Agricultural Engineering
Rajesh J. Banu, G. Ginni, S. Kavitha, Yukesh R. Kannah, Adish S. Kumar, Shashi Kant Bhatia, Gopalakrishnan Kumar
Summary: Acidogenic fermentation is a key pathway for producing biohydrogen and short chain carboxylic acids, with the potential for producing additional value-added products. The application of a biorefinery can lead to efficient recovery of biofuels and value-added products, resulting in extra profits.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Medicinal
Elina Didrihsone, Konstantins Dubencovs, Mara Grube, Karlis Shvirksts, Anastasija Suleiko, Arturs Suleiko, Juris Vanags
Summary: This study investigated the effects of alternative carbon and nitrogen sources on the cultivation of Crypthecodinium cohnii. The results showed that using the extraction ethanol (EE) from lipid extraction as a carbon source could stimulate the growth rate of biomass, and supplementing with dinoflagellate extract (DE) further enhanced the growth and yield of biomass. Additionally, mediums supplemented with EE or DE also promoted the accumulation of PUFAs/docosahexaenoic acid (DHA).
Article
Biotechnology & Applied Microbiology
Patricia Moniz, Daniela Martins, Ana Cristina Oliveira, Alberto Reis, Teresa Lopes da Silva
Summary: This study presents a novel approach of producing C. cohnii biomass using low-cost industrial by-products and converting it into fatty acid ethyl esters for various applications. The results show that the process was successful in producing a high concentration of biomass with a significant lipid content, which could be fractionated to obtain specific fractions for different purposes.
FERMENTATION-BASEL
(2022)
Article
Biotechnology & Applied Microbiology
Alicia Paz, Angelina Chalima, Evangelos Topakas
Summary: This study explores the production of pectinases by Crypthecodinium cohnii using liquors obtained after organosolv pretreatment of exhausted olive pomace (EOP) as culture media, demonstrating a cost-effective and zero-waste process.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Article
Energy & Fuels
Niloofar Hoseinkhani, Hasan Jalili, Shahin Ansari, Abdeltif Amrane
Summary: Cultivation conditions, especially agitation and aeration, play crucial roles in the growth and DHA formation of Crypthecodinium cohnii. This study found that different air bubble sizes in a 5-L bubble column bioreactor had a significant impact on the growth and DHA production of C. cohnii, with the highest DHA yield achieved at a 0.36-cm air bubble diameter. Oxygen limitation conditions were observed to increase the concentration of microalgal DHA, highlighting the importance of optimal bubble size in a bubble column bioreactor for DHA production.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Article
Engineering, Environmental
Le Zhang, Kai-Chee Loh, Agnes Kuroki, Yanjun Dai, Yen Wah Tong
Summary: This article summarizes the current status of key technical steps in microbial biodiesel production, including acidogenic fermentation, lipid accumulation, microbial lipid extraction, transesterification, and biodiesel purification. Emerging membrane-based bioprocesses and genetic/metabolic engineering approaches are promising for improving efficiency. The use of in situ transesterification technologies aided by microwave, ultrasound, and supercritical solvents is recommended for future research to enhance fatty acids synthesis. Technical limitations, cost-effectiveness, and potential industrial development of microbial biodiesel production from bio-wastes are also discussed.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Agricultural Engineering
Anthi Karnaouri, Konstantinos G. Kalogiannis, Savvas Staikos, Stamatia Karakoulia, Angelos A. Lappas, Evangelos Topakas
Summary: In this study, a novel OxiOrganosolv pretreatment was developed for the fractionation of beechwood, using a combination of water, organic solvents, polyoxometalate complexes (POMs) as catalysts, and O2 as an oxidative agent. POMs demonstrated high efficiency in simultaneously hydrolyzing hemicellulose and oxidizing lignin ether bonds, leading to depolymerization and removal of lignin. The use of commercially available HPMo and in-house produced Fe- and Cu-exchanged salts as catalysts significantly improved delignification and hemicellulose removal compared to the absence of catalyst. Enzymatic digestibility evaluation showed that HPMo was the most favorable catalyst for increased saccharification yields and production of sugar-rich hydrolysates, which were used as carbon sources for the production of w-3 PUFAs from Crypthecodinium cohnii. The study demonstrates the potential of POMs as catalysts for efficient biomass delignification to obtain sugar-rich streams for nutraceutical production.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Agricultural Engineering
R. Bevilacqua, A. Regueira, M. Mauricio-Iglesias, J. M. Lema, M. Carballa
Summary: This study found that pH adjustment can influence the production of volatile fatty acids during mixed-culture fermentation of proteins. The conversion of proteins into VFAs is affected by pH, energetic yields, and the molecular configuration of amino acids.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Bohyeon Kim, Jihoon Jeong, Jihyeon Kim, Hyon Hee Yoon, Phan Khanh Thinh Nguyen, Jongsung Kim
Summary: This study presents a mathematical model for the production of H-2 and VFAs from particulate macroalgal substrates via dark fermentation. The model accurately predicts the conversion process and end products, with a high R-2 value. The findings provide valuable insights for future research in this area.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
A. Serra-Toro, S. Vinardell, S. Astals, S. Madurga, J. Llorens, J. Mata-Alvarez, F. Mas, J. Dosta
Summary: A gas-permeable membrane (GPM) contactor is a suitable technology to efficiently separate ammoniacal nitrogen and volatile fatty acids (VFA) from fermentation broths under different pH and temperature conditions.
BIORESOURCE TECHNOLOGY
(2022)
Article
Microbiology
Liangsen Liu, Jinjin Diao, Yali Bi, Lei Zeng, Fangzhong Wang, Lei Chen, Weiwen Zhang
Summary: This study demonstrated the effectiveness of fermentation supernatant-based adaptive laboratory evolution (FS-ALE) in improving cell growth and DHA production in heterotrophic microalgae. Proteomic analysis identified key proteins and metabolic pathways associated with the improved performance.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Environmental Sciences
Ruan F. F. Vieira, Eduardo B. B. Sydney, Karina G. G. Fiametti, Joao H. C. Wancura, J. Vladimir Oliveira
Summary: This study investigated the production of volatile fatty acids (VFAs) by a consortium of microorganisms obtained from whey. The effectiveness of chemical hydrolysis and supplementation with yeast extract and peptone was evaluated to determine the process that provides the highest VFAs production. The results showed that chemical hydrolysis did not significantly affect the production of compounds, while supplementation played a crucial role in increasing VFAs production. Butyric acid was the compound with the highest amount produced, and it had better results with supplemented hydrolyzed whey.
WASTE AND BIOMASS VALORIZATION
(2023)
Article
Thermodynamics
Haowen Feng, Chihe Sun, Chaofan Zhang, Haixing Chang, Nianbing Zhong, Wenbo Wu, Haihua Wu, Xuefei Tan, Mengying Zhang, Shih-Hsin Ho
Summary: This study proposes a method that combines microalgal photosynthesis with dark fermentation to reclaim nutrients and organics from landfill leachate and produce biohydrogen and volatile fatty acids. The results demonstrate that microalgae can grow well in the leachate and efficiently recover nitrogen and organics, converting them into energy through dark fermentation.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Review
Agricultural Engineering
Alok Patel, Omprakash Sarkar, Ulrika Rova, Paul Christakopoulos, Leonidas Matsakas
Summary: Volatile fatty acids, generated during anaerobic digestion of organic waste, have emerged as a renewable feedstock for microbial oil production. This review discusses the metabolic pathways enabling lipogenesis from volatile fatty acids and strategies to enhance lipid accumulation by tuning the ratios of volatile fatty acids in oleaginous microorganisms.
BIORESOURCE TECHNOLOGY
(2021)
Review
Environmental Sciences
Julien Lacroux, Mercedes Llamas, Kevin Dauptain, Romina Avila, Jean-Philippe Steyer, Robert van Lis, Eric Trably
Summary: The implementation of a sustainable bio-based economy is a top priority. Efforts have been made to use organic waste for biohydrogen production via dark fermentation. The valorization of dark fermentation effluents as carbon sources for microalgae cultivation is an innovative approach that maximizes carbon recovery. This integrated process plays a key role in the transition towards a circular economy.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Agricultural Engineering
Anthi Karnaouri, Koar Chorozian, Dimitrios Zouraris, Antonis Karantonis, Evangelos Topakas, Ulrika Rova, Paul Christakopoulos
Summary: Nanocellulose, whether in fiber or crystal form, is a renewable, biobased, biocompatible material with advantageous mechanical properties that can be isolated through enzyme-assisted processes, leading to higher quality products. The use of Lytic Polysaccharide Monooxygenases (LPMOs) for cellulose fiber treatment towards nanostructrue isolation highlights their potential for novel production of nanocellulose from lignocellulose.
BIORESOURCE TECHNOLOGY
(2022)
Article
Polymer Science
Olivia A. Attallah, Muhammad Azeem, Efstratios Nikolaivits, Evangelos Topakas, Margaret Brennan Fournet
Summary: In this study, a green method for depolymerization of polyethylene terephthalate (PET) using deep eutectic solvent (DES) and enzymatic hydrolysis was demonstrated. The use of microwave-assisted DES technology improved the efficiency of the reaction.
Editorial Material
Biotechnology & Applied Microbiology
Evangelos Topakas, Jasmina Nikodinovic-Runic, Qingsheng Qi
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Environmental Sciences
Anastasia Zerva, Romanos Siaperas, George Taxeidis, Maria Kyriakidi, Stamatina Vouyiouka, Georgios I. Zervakis, Evangelos Topakas
Summary: White-rot fungus Abortiporus biennis has been studied for its lignocellulolytic potential. The strain was found to possess all necessary enzymatic activities for complete biomass degradation, with oxidative enzymes playing a prominent role. Two novel laccases, AbiLac1 and AbiLac2, were discovered and shown to have the ability to oxidize a wide range of substrates. This study highlights the biotechnological potential of unexplored enzymatic machinery in white-rot basidiomycetes, including improved lignocellulolytic cocktails and the degradation/valorization of plastic waste materials.
Article
Chemistry, Physical
Brana Pantelic, Sanja Skaro Bogojevic, Dusan Milivojevic, Tatjana Ilic-Tomic, Branka Loncarevic, Vladimir Beskoski, Veselin Maslak, Maciej Guzik, Konstantinos Makryniotis, George Taxeidis, Romanos Siaperas, Evangelos Topakas, Jasmina Nikodinovic-Runic
Summary: Polyurethanes (PUs) are widely used plastic polymers in various industries, but their accumulation as waste and the associated environmental impacts have raised concerns. This study synthesized and characterized synthetic compounds representing partial PU hydrolysis products to assess their toxicity and suitability for identifying biocatalysts for PU biodegradation. The compounds showed low in vitro cytotoxicity and low toxic effects on the nematode C. elegans. Two compounds exhibited moderate aquatic ecotoxicity. They were also used to study the cleaving preference of known plastic-degrading enzymes and to identify a novel PU-degrading biocatalyst, Amycolatopsis mediterranei ISP5501. This study highlights the potential of biotechnological processes for PU waste treatment.
Article
Environmental Sciences
Anastasia Zerva, Milad Mohammadi, Georgios Dimopoulos, Petros Taoukis, Evangelos Topakas
Summary: Alternative sweeteners, such as steviol glucosides, are popular for next-generation food design. However, the bitter aftertaste of native steviol glucosides hinders consumer acceptance. This study proposes a novel enzymatic process using beta-glucanase for the modification of stevioside, with the potential valorization of beta-glucans from fungal biomass.
WASTE AND BIOMASS VALORIZATION
(2023)
Article
Biotechnology & Applied Microbiology
Alicia Paz, Anastasia Zerva, Evangelos Topakas
Summary: In this study, olive mill wastewater (OMWW) was used as a low-cost substrate to produce lipases by Bacillus aryabhattai BA03, reducing the production costs. Non-sterilized or sterilized media formulated with 25% OMWW showed double or triple the enzyme activity compared to synthetic medium, while the highest activity was observed at pH 8, 27 degrees C, and 50% OMWW under non-sterile conditions.
BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY
(2023)
Article
Chemistry, Applied
Christina Pentari, Anastasia Zerva, Maria Dimarogona, Evangelos Topakas
Summary: It has been discovered that xylanases can accommodate acetyl side-groups and release acetylated xylobiose. However, acetyl esterases show synergy with TtXyn30A, indicating that certain subsites in its active site cannot tolerate acetylated xylopyranose residues. Molecular docking analysis reveals that the acetyl group can be accommodated at the 2- or 3-OH position of the non-reducing end xylose, but only 3-OH decoration can be accommodated at the reducing-end xylose (subsite -1). These insights into the catalytic activity of TtXyn30A can contribute to a better understanding of its biological role and enable more efficient biotechnological utilization.
CARBOHYDRATE POLYMERS
(2023)
Article
Environmental Sciences
George Taxeidis, Efstratios Nikolaivits, Romanos Siaperas, Christina Gkountela, Stamatina Vouyiouka, Brana Pantelic, Jasmina Nikodinovic-Runic, Evangelos Topakas
Summary: The uncontrollable disposal of plastic waste has raised concerns in the scientific community. In this study, various fungi were screened for their ability to degrade synthetic polymers. Three fungal strains belonging to Fusarium and Aspergillus genera were found to have promising enzymatic activities for polymer degradation.
ENVIRONMENTAL POLLUTION
(2023)
Article
Biochemistry & Molecular Biology
Christina Ferousi, Christos Kosinas, Efstratios Nikolaivits, Evangelos Topakas, Maria Dimarogona
Summary: In this study, the crystal structure of a Feruloyl esterase (FoFaeC) from Fusarium oxysporum in complex with p-coumaric acid was reported, providing the first ligand-bound structure of a tannase-like Feruloyl esterase. The data showed local conformational changes around the active site upon ligand binding, suggesting interconversion between an active and a resting state of the enzyme. A swinging tyrosine residue was found to gate the substrate binding pocket, while the lid domain of the protein exerted substrate specificity through a well-defined hydrophobic core that encased the phenyl moiety of the substrate.
Article
Biochemical Research Methods
Christos Kosinas, Anastasia Zerva, Evangelos Topakas, Maria Dimarogona
Summary: This study focuses on understanding the structure-function determinants of a novel laccase-like multicopper oxidase, TtLMCO1, from the thermophilic fungus Thermothelomyces thermophila. The crystal structure of TtLMCO1, determined using an AlphaFold2 model, revealed a three-domain laccase with two copper sites, lacking the C-terminal plug observed in other ascolaccases. Analysis of solvent tunnels identified crucial amino acids for proton transfer, while docking simulations provided structural evidence for the enzyme's promiscuity in oxidizing ortho-substituted phenols.
ACTA CRYSTALLOGRAPHICA SECTION D-STRUCTURAL BIOLOGY
(2023)
Article
Agricultural Engineering
Anthi Karnaouri, Konstantinos G. Kalogiannis, Savvas Staikos, Stamatia Karakoulia, Angelos A. Lappas, Evangelos Topakas
Summary: In this study, a novel OxiOrganosolv pretreatment was developed for the fractionation of beechwood, using a combination of water, organic solvents, polyoxometalate complexes (POMs) as catalysts, and O2 as an oxidative agent. POMs demonstrated high efficiency in simultaneously hydrolyzing hemicellulose and oxidizing lignin ether bonds, leading to depolymerization and removal of lignin. The use of commercially available HPMo and in-house produced Fe- and Cu-exchanged salts as catalysts significantly improved delignification and hemicellulose removal compared to the absence of catalyst. Enzymatic digestibility evaluation showed that HPMo was the most favorable catalyst for increased saccharification yields and production of sugar-rich hydrolysates, which were used as carbon sources for the production of w-3 PUFAs from Crypthecodinium cohnii. The study demonstrates the potential of POMs as catalysts for efficient biomass delignification to obtain sugar-rich streams for nutraceutical production.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Engineering, Environmental
Konstantinos Makryniotis, Efstratios Nikolaivits, Christina Gkountela, Stamatina Vouyiouka, Evangelos Topakas
Summary: Plastic pollution is a significant environmental challenge and traditional waste management strategies are inadequate for addressing this problem. Enzymatic degradation, particularly using LCCICCG, has shown promise in breaking down PET, the most commonly produced and discarded polyester. However, more efficient PET-hydrolases are needed for larger scale biorefineries.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Food Science & Technology
Marijana Ponjavic, Vuk Filipovic, Evangelos Topakas, Anthi Karnaouri, Jelena Zivkovic, Nemanja Krgovic, Jelena Mudric, Katarina Savikin, Jasmina Nikodinovic-Runic
Summary: This research demonstrates the upcycling process of lignocellulose into enriched bacterial nanocellulose (BNC) functionalized with black raspberry extract (BR). The BNC-BR material showed antioxidant and antimicrobial activity, highlighting its potential as a sustainable food industry material.
Article
Nanoscience & Nanotechnology
Maria Kanelli, Bahram Saleh, Thomas J. Webster, Stamatina Vouyiouka, Evangelos Topakas
Summary: The possibility of drug-resistant bacterial infections in hospitals is a significant concern, particularly for immunocompromised cancer patients. In this study, researchers co-encapsulated violacein and superparamagnetic iron oxide nanoparticles in polylactic acid nanoparticles, and tested their antimicrobial and anticancer activity. The results showed that the system exhibited high saturation magnetization and effectively inhibited the growth of drug-resistant Staphylococcus aureus, while also showing potential for inhibiting cancer cell growth.
JOURNAL OF BIOMEDICAL NANOTECHNOLOGY
(2022)
Article
Energy & Fuels
Shitong Fang, Houfan Du, Tao Yan, Keyu Chen, Zhiyuan Li, Xiaoqing Ma, Zhihui Lai, Shengxi Zhou
Summary: This paper proposes a new type of nonlinear VIV energy harvester (ANVEH) that compensates for the decrease in peak energy output at low wind speeds by introducing an auxiliary structure. Theoretical and experimental results show that ANVEH performs better than traditional nonlinear VIV energy harvesters under various system parameter variations.
Article
Energy & Fuels
Wei Jiang, Shuo Zhang, Teng Wang, Yufei Zhang, Aimin Sha, Jingjing Xiao, Dongdong Yuan
Summary: A standardized method was developed to evaluate the availability of solar energy resources in road areas, which combined the Analytic Hierarchy Process (AHP) and the Geographic Information System (GIS). By analyzing critical factors and using a multi-indicator evaluation method, the method accurately evaluated the utilization of solar energy resources and guided the optimal location selection for road photovoltaic (PV) projects. The results provided guidance for the application of road PV projects and site selection for route corridors worldwide, promoting the integration of transportation and energy.
Article
Energy & Fuels
Chang Liu, Jacob A. Wrubel, Elliot Padgett, Guido Bender
Summary: The study investigates the effects of coating defects on the performance of the anode porous transport layer (PTL) in water electrolyzers. The results show that an increasing fraction of uncoated regions on the PTL leads to decreased cell performance, with continuous uncoated regions having a more severe impact compared to multiple thin uncoated strips.
Article
Energy & Fuels
Marcos Tostado-Veliz, Xiaolong Jin, Rohit Bhakar, Francisco Jurado
Summary: In this paper, a coordinated charging price mechanism for clusters of parking lots is proposed. The research shows that enabling vehicle-to-grid characteristics can bring significant economic benefits for users and the cluster coordinator, and vehicle-to-grid impacts noticeably on the risk-averse character of the uncertainty-aware strategies. The developed pricing mechanism can reduce the cost for users, avoiding to directly translate the energy cost to charging points.
Article
Energy & Fuels
Duan Kang
Summary: Building an energy superpower is a key strategy for China and a long-term goal for other countries. This study proposes an evaluation system and index for measuring energy superpower, and finds that China has significantly improved its ranking over the past 21 years, surpassing other countries.
Article
Energy & Fuels
Fucheng Deng, Yifei Wang, Xiaosen Li, Gang Li, Yi Wang, Bin Huang
Summary: This study investigated the synergistic blockage mechanism of sand and hydrate in gravel filling layer and the evolution of permeability in the layer. Experimental models and modified permeability models were established to analyze the effects of sand particles and hydrate formation on permeability. The study provided valuable insights for the safe and efficient exploitation of hydrate reservoirs.
Article
Energy & Fuels
Hao Wang, Xiwen Chen, Natan Vital, Edward Duffy, Abolfazl Razi
Summary: This study proposes a HVAC energy optimization model based on deep reinforcement learning algorithm. It achieves 37% energy savings and ensures thermal comfort for open office buildings. The model has a low complexity, uses a few controllable factors, and has a short training time with good generalizability.
Article
Energy & Fuels
Moyue Cong, Yongzhuo Gao, Weidong Wang, Long He, Xiwang Mao, Yi Long, Wei Dong
Summary: This study introduces a multi-strategy ultra-wideband energy harvesting device that achieves high power output without the need for external power input. By utilizing asymmetry, stagger array, magnetic coupling, and nonlinearity strategies, the device maintains a stable output voltage and high power density output at non-resonant frequencies. Temperature and humidity monitoring are performed using Bluetooth sensors to adaptively assess the device.
Article
Energy & Fuels
Tianshu Dong, Xiudong Duan, Yuanyuan Huang, Danji Huang, Yingdong Luo, Ziyu Liu, Xiaomeng Ai, Jiakun Fang, Chaolong Song
Summary: Electrochemical water splitting is crucial for hydrogen production, and improving the hydrogen separation rate from the electrode is essential for enhancing water electrolyzer performance. However, issues such as air bubble adhesion to the electrode plate hinder the process. Therefore, a methodology to investigate the two-phase flow within the electrolyzer is in high demand. This study proposes using a microfluidic system as a simulator for the electrolyzer and optimizing the two-phase flow by manipulating the micro-structure of the flow.
Article
Energy & Fuels
Shuo Han, Yifan Yuan, Mengjiao He, Ziwen Zhao, Beibei Xu, Diyi Chen, Jakub Jurasz
Summary: Giving full play to the flexibility of hydropower and integrating more variable renewable energy is of great significance for accelerating the transformation of China's power energy system. This study proposes a novel day-ahead scheduling model that considers the flexibility limited by irregular vibration zones (VZs) and the probability of flexibility shortage in a hydropower-variable renewable energy hybrid generation system. The model is applied to a real hydropower station and effectively improves the flexibility supply capacity of hydropower, especially during heavy load demand in flood season.
Article
Energy & Fuels
Zhen Wang, Kangqi Fan, Shizhong Zhao, Shuxin Wu, Xuan Zhang, Kangjia Zhai, Zhiqi Li, Hua He
Summary: This study developed a high-performance rotary energy harvester (AI-REH) inspired by archery, which efficiently accumulates and releases ultralow-frequency vibration energy. By utilizing a magnetic coupling strategy and an accumulator spring, the AI-REH achieves significantly accelerated rotor speeds and enhanced electric outputs.
Article
Energy & Fuels
Yi Yang, Qianyi Xing, Kang Wang, Caihong Li, Jianzhou Wang, Xiaojia Huang
Summary: In this study, a novel hybrid Quantile Regression (QR) model is proposed for Probabilistic Load Forecasting (PLF). The model integrates causal dilated convolution, residual connection, and Bidirectional Long Short-Term Memory (BiLSTM) for multi-scale feature extraction. In addition, a Combined Probabilistic Load Forecasting System (CPLFS) is proposed to overcome the inherent flaws of relying on a single model. Simulation results show that the hybrid QR outperforms traditional models and CPLFS exceeds the best benchmarks in terms of prediction accuracy and stability.
Article
Energy & Fuels
Wen-Jiang Zou, Young-Bae Kim, Seunghun Jung
Summary: This paper proposes a dynamic prediction model for capacity fade in vanadium redox flow batteries (VRFBs). The model accurately predicts changes in electrolyte volume and capacity fade, enhancing the competitiveness of VRFBs in energy storage applications.
Article
Energy & Fuels
Yuechao Ma, Shengtie Wang, Guangchen Liu, Guizhen Tian, Jianwei Zhang, Ruiming Liu
Summary: This paper focuses on the balance of state of charge (SOC) among multiple battery energy storage units (MBESUs) and bus voltage balance in an islanded bipolar DC microgrid. A SOC automatic balancing strategy is proposed considering the energy flow relationship and utilizing the adaptive virtual resistance algorithm. The simulation results demonstrate the effectiveness of the proposed strategy in achieving SOC balancing and decreasing bus voltage unbalance.
Article
Energy & Fuels
Raad Z. Homod, Basil Sh. Munahi, Hayder Ibrahim Mohammed, Musatafa Abbas Abbood Albadr, Aissa Abderrahmane, Jasim M. Mahdi, Mohamed Bechir Ben Hamida, Bilal Naji Alhasnawi, A. S. Albahri, Hussein Togun, Umar F. Alqsair, Zaher Mundher Yaseen
Summary: In this study, the control problem of the multiple-boiler system (MBS) is formulated as a dynamic Markov decision process and a deep clustering reinforcement learning approach is applied to obtain the optimal control policy. The proposed strategy, based on bang-bang action, shows superior response and achieves more than 32% energy saving compared to conventional fixed parameter controllers under dynamic indoor/outdoor actual conditions.