Pub Date : 2026-01-15DOI: 10.1016/j.apenergy.2026.127377
Haopeng An , Yihao Xu , Guangdou Zhang , Yankai Xing , Yalong Mai , Olusola Bamisile , Qi Huang , Jian Li
The co-dispatch of electric vehicles (EVs) and mobile energy storage systems (MESSs) as mobile power sources (MPSs) has emerged as a critical means for the rapid restoration of post-disaster distribution networks (DNs). However, MESSs have DN restoration as a single objective, while private EVs pursue dual objectives: supporting DN restoration and fulfilling individual charging demands. The heterogeneous objectives of EVs and MESSs, coupled with their limited adaptability for rapid deployment in unpredictable post-disaster scenarios, result in coordination failures during deployment. To this end, this paper proposes a dynamic gradient masking embedded multi-agent meta-deep reinforcement learning (DGME-MAMDRL) strategy. A tailored reward function is designed to guide EVs in making correct decisions between charging and DN restoration. Each MPS is modelled as an independent agent within a Markov Game for DN restoration. The proposed strategy is applied to batches of pre-training tasks for knowledge extraction. A dynamic gradient masking mechanism is proposed and embedded within the strategy to enhance the prior knowledge extraction from different tasks. In this way, the agents need only a quick fine-tuning stage for post-disaster deployment. Case studies validate the effectiveness of the proposed strategy in the co-dispatch of hybrid MPSs and its capability for rapid deployment.
{"title":"Coordinated dispatch of hybrid mobile power sources for distribution network restoration: A dynamic gradient masking embedded multi-agent meta-deep reinforcement learning method","authors":"Haopeng An , Yihao Xu , Guangdou Zhang , Yankai Xing , Yalong Mai , Olusola Bamisile , Qi Huang , Jian Li","doi":"10.1016/j.apenergy.2026.127377","DOIUrl":"10.1016/j.apenergy.2026.127377","url":null,"abstract":"<div><div>The co-dispatch of electric vehicles (EVs) and mobile energy storage systems (MESSs) as mobile power sources (MPSs) has emerged as a critical means for the rapid restoration of post-disaster distribution networks (DNs). However, MESSs have DN restoration as a single objective, while private EVs pursue dual objectives: supporting DN restoration and fulfilling individual charging demands. The heterogeneous objectives of EVs and MESSs, coupled with their limited adaptability for rapid deployment in unpredictable post-disaster scenarios, result in coordination failures during deployment. To this end, this paper proposes a dynamic gradient masking embedded multi-agent meta-deep reinforcement learning (DGME-MAMDRL) strategy. A tailored reward function is designed to guide EVs in making correct decisions between charging and DN restoration. Each MPS is modelled as an independent agent within a Markov Game for DN restoration. The proposed strategy is applied to batches of pre-training tasks for knowledge extraction. A dynamic gradient masking mechanism is proposed and embedded within the strategy to enhance the prior knowledge extraction from different tasks. In this way, the agents need only a quick fine-tuning stage for post-disaster deployment. Case studies validate the effectiveness of the proposed strategy in the co-dispatch of hybrid MPSs and its capability for rapid deployment.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"408 ","pages":"Article 127377"},"PeriodicalIF":11.0,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-15DOI: 10.1016/j.apenergy.2026.127393
Linghong Zeng , Zishan Yin , Fengyuan Guo , Pengyu Yue , Yixiang Ai , Hongchuan Qin , Jiashu Jin , Zhonghua Deng , Zhuo Wang , Xi Li
With the increasing drawbacks of fossil energy characterized by high consumption and emissions, the goals of carbon peaking and carbon neutrality have become central to structural transformation in the energy sector. The study addresses the dual challenges faced by regional hydrogen-supported microgrid networking, namely, uncertain source-load conditions and equipment health states. A novel networking optimization method is proposed that integrates uncertainty modeling, health assessment, and multi-criteria decision-making, aiming to achieve economically optimal, safe, and flexible collaborative operation of microgrids. First, probabilistic statistics and scenario generation techniques are employed to accurately quantify stochastic fluctuations from renewable generation and load demand, thereby enhancing the adaptability of networking schemes through multi-scenario simulations. Second, a dynamic state of health (SOH) assessment is introduced, embedding degradation models of proton exchange membrane fuel cells (PEMFCs) and proton exchange membrane electrolyzers (PEMECs) into the planning process to enable resource allocation optimization over time. Third, a multidimensional evaluation framework is constructed, encompassing operational costs, long-term health state variations, and total investment costs. Finally, under different source-load quantile scenarios, the proposed method demonstrates superior economic efficiency and robustness in PEMFC and PEMEC capacity configuration compared with conventional mixed-integer programming approaches. Moreover, the incorporation of SOH constraints significantly improves both energy output and economic performance of the system.
{"title":"Optimization design of hydrogen energy supported microgrid network capacity based on hydrogen energy equipment behavior pattern inversion under uncertain conditions","authors":"Linghong Zeng , Zishan Yin , Fengyuan Guo , Pengyu Yue , Yixiang Ai , Hongchuan Qin , Jiashu Jin , Zhonghua Deng , Zhuo Wang , Xi Li","doi":"10.1016/j.apenergy.2026.127393","DOIUrl":"10.1016/j.apenergy.2026.127393","url":null,"abstract":"<div><div>With the increasing drawbacks of fossil energy characterized by high consumption and emissions, the goals of carbon peaking and carbon neutrality have become central to structural transformation in the energy sector. The study addresses the dual challenges faced by regional hydrogen-supported microgrid networking, namely, uncertain source-load conditions and equipment health states. A novel networking optimization method is proposed that integrates uncertainty modeling, health assessment, and multi-criteria decision-making, aiming to achieve economically optimal, safe, and flexible collaborative operation of microgrids. First, probabilistic statistics and scenario generation techniques are employed to accurately quantify stochastic fluctuations from renewable generation and load demand, thereby enhancing the adaptability of networking schemes through multi-scenario simulations. Second, a dynamic state of health (SOH) assessment is introduced, embedding degradation models of proton exchange membrane fuel cells (PEMFCs) and proton exchange membrane electrolyzers (PEMECs) into the planning process to enable resource allocation optimization over time. Third, a multidimensional evaluation framework is constructed, encompassing operational costs, long-term health state variations, and total investment costs. Finally, under different source-load quantile scenarios, the proposed method demonstrates superior economic efficiency and robustness in PEMFC and PEMEC capacity configuration compared with conventional mixed-integer programming approaches. Moreover, the incorporation of SOH constraints significantly improves both energy output and economic performance of the system.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"408 ","pages":"Article 127393"},"PeriodicalIF":11.0,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Photovoltaic (PV) power generation is increasingly deployed in ports to support green and low-carbon development. However, the harsh operating environment and the scarcity of fault data in newly installed PV arrays hinder accurate and reliable fault diagnosis. To address the issues of data imbalance and fault sample scarcity typically encountered during the initial deployment of PV arrays in port areas, this study proposes an enhanced oversampling algorithm, Adaptive K-nearest neighbor and Dynamic Random-disturbance-based Synthetic Minority Over-sampling Technique (AKDRSMOTE), for fault data augmentation. Furthermore, a hybrid strategy based on improved Harris Hawks Optimization (IHHO) optimized support vector machine (SVM) is proposed to enhance the diagnostic performance.Experimental results demonstrate that under small-sample and imbalanced data conditions, the proposed approach effectively identifies various complex PV faults. The model achieves an accuracy of 93.42%, an F1-score of 88.09%, and a Kappa coefficient of 92.89%, all of which outperform traditional fault detection techniques. These findings substantiate the accuracy, robustness, and stability of the proposed method in complex port environments and highlight its strong potential for real-world engineering applications in intelligent PV system operation and maintenance.
{"title":"Fault diagnosis of photovoltaic arrays at ports under small-sample and imbalanced data conditions","authors":"Zhiya Xiao , Daogui Tang , Qianneng Zhang , Hamidreza Arasteh , Josep M. Guerrero , Enrico Zio","doi":"10.1016/j.apenergy.2026.127401","DOIUrl":"10.1016/j.apenergy.2026.127401","url":null,"abstract":"<div><div>Photovoltaic (PV) power generation is increasingly deployed in ports to support green and low-carbon development. However, the harsh operating environment and the scarcity of fault data in newly installed PV arrays hinder accurate and reliable fault diagnosis. To address the issues of data imbalance and fault sample scarcity typically encountered during the initial deployment of PV arrays in port areas, this study proposes an enhanced oversampling algorithm, Adaptive K-nearest neighbor and Dynamic Random-disturbance-based Synthetic Minority Over-sampling Technique (AKDRSMOTE), for fault data augmentation. Furthermore, a hybrid strategy based on improved Harris Hawks Optimization (IHHO) optimized support vector machine (SVM) is proposed to enhance the diagnostic performance.Experimental results demonstrate that under small-sample and imbalanced data conditions, the proposed approach effectively identifies various complex PV faults. The model achieves an accuracy of 93.42%, an F1-score of 88.09%, and a Kappa coefficient of 92.89%, all of which outperform traditional fault detection techniques. These findings substantiate the accuracy, robustness, and stability of the proposed method in complex port environments and highlight its strong potential for real-world engineering applications in intelligent PV system operation and maintenance.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"408 ","pages":"Article 127401"},"PeriodicalIF":11.0,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-14DOI: 10.1016/j.apenergy.2026.127369
Lingfang Yang , Yujie Lin , Mohammad Shahidehpour , Yuanyi Chen , Qiang Yang
Along with the rapidly increasing data traffic, data centers (DTCs) have considered the expansion of their server capacity, which has led to higher energy consumption. To deal with this issue, an effective solution is presented for the coupled electricity-heat-computation system (CEHCS) in DTCs. However, CEHCS uncertainties of loads and energy resources can pose additional challenges for the optimal planning of DTC. Therefore, this work proposes a bi-level expansion planning of DTCs, which considers data-driven scenario generation for representing CEHCS uncertainties. First, a diffusion model is designed using the operational scenario generation (DMOSG) method to characterize the multi-dimensional randomness of multivariate time series, where a one-dimensional U-net works as the denoising network with an interpretable latent output space. Then, a DTC expansion planning model with CEHCS is formulated considering the safe operation temperature of CPUs, where the operational status of each server is individually characterized to increase the proposed model's fidelity. Although the DMOSG helps address the randomness of input scenarios for planning, it is also necessary to consider the uncertainty hedging for energy scheduling. Thus, chance constraints are included for BESSs to cope with risks during CEHCS dispatch. A heuristic solution is proposed for the bi-level scheme to solve the DTC planning model. At the upper level, the number of servers to be added is determined by the particle swarm optimization (PSO) algorithm. The upper-level solution is submitted to the lower level, where the performance cost of DTC planning and scheduling decisions is obtained by the Gurobi solver. Then, the DTC performance cost is returned to the upper level iteratively for calculating the optimal DTC planning results. The proposed DTC planning solution with CEHCS is validated through case studies, where the numerical results confirm the accuracy of the proposed characterization of operational uncertainty, as well as the cost-effectiveness and improved energy efficiency of the DTC expansion planning scheme.
{"title":"Bi-level planning of data centers with coupled electricity-heat-computation system using data-driven scenario generation for representing uncertainties","authors":"Lingfang Yang , Yujie Lin , Mohammad Shahidehpour , Yuanyi Chen , Qiang Yang","doi":"10.1016/j.apenergy.2026.127369","DOIUrl":"10.1016/j.apenergy.2026.127369","url":null,"abstract":"<div><div>Along with the rapidly increasing data traffic, data centers (DTCs) have considered the expansion of their server capacity, which has led to higher energy consumption. To deal with this issue, an effective solution is presented for the coupled electricity-heat-computation system (CEHCS) in DTCs. However, CEHCS uncertainties of loads and energy resources can pose additional challenges for the optimal planning of DTC. Therefore, this work proposes a bi-level expansion planning of DTCs, which considers data-driven scenario generation for representing CEHCS uncertainties. First, a diffusion model is designed using the operational scenario generation (DMOSG) method to characterize the multi-dimensional randomness of multivariate time series, where a one-dimensional U-net works as the denoising network with an interpretable latent output space. Then, a DTC expansion planning model with CEHCS is formulated considering the safe operation temperature of CPUs, where the operational status of each server is individually characterized to increase the proposed model's fidelity. Although the DMOSG helps address the randomness of input scenarios for planning, it is also necessary to consider the uncertainty hedging for energy scheduling. Thus, chance constraints are included for BESSs to cope with risks during CEHCS dispatch. A heuristic solution is proposed for the bi-level scheme to solve the DTC planning model. At the upper level, the number of servers to be added is determined by the particle swarm optimization (PSO) algorithm. The upper-level solution is submitted to the lower level, where the performance cost of DTC planning and scheduling decisions is obtained by the Gurobi solver. Then, the DTC performance cost is returned to the upper level iteratively for calculating the optimal DTC planning results. The proposed DTC planning solution with CEHCS is validated through case studies, where the numerical results confirm the accuracy of the proposed characterization of operational uncertainty, as well as the cost-effectiveness and improved energy efficiency of the DTC expansion planning scheme.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"408 ","pages":"Article 127369"},"PeriodicalIF":11.0,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-14DOI: 10.1016/j.apenergy.2026.127402
Darío Slaifstein, Gautham Ram Chandra Mouli, Laura Ramirez-Elizondo, Pavol Bauer
The operation of residential energy hubs with multiple energy carriers (electricity, heat, mobility) poses a significant challenge due to different carrier dynamics, hybrid storage coordination and high-dimensional action-spaces. Energy management systems oversee their operation, deciding the set points of the primary control layer. This paper presents a novel 2-stage economic model predictive controller for electrified buildings including physics-based models of the battery degradation and thermal systems. The hierarchical control operates in the Dutch sequential energy markets. In particular common assumptions regarding intra-day markets (auction and continuous-time) are discussed as well as the coupling of the different storage systems. The best control policy it is best to follow continuous time intra-day in the summer and the intra-day auction in the winter. This sequential operation comes at the expense of increased battery degradation. Lastly, under our controller, the realized short-term flexibility of the thermal energy storage is marginal compared to the flexibility delivered by stationary battery pack and electric vehicles with bidirectional charging.
{"title":"Sequential operation of residential energy hubs using physics-based economic nonlinear MPC","authors":"Darío Slaifstein, Gautham Ram Chandra Mouli, Laura Ramirez-Elizondo, Pavol Bauer","doi":"10.1016/j.apenergy.2026.127402","DOIUrl":"10.1016/j.apenergy.2026.127402","url":null,"abstract":"<div><div>The operation of residential energy hubs with multiple energy carriers (electricity, heat, mobility) poses a significant challenge due to different carrier dynamics, hybrid storage coordination and high-dimensional action-spaces. Energy management systems oversee their operation, deciding the set points of the primary control layer. This paper presents a novel 2-stage economic model predictive controller for electrified buildings including physics-based models of the battery degradation and thermal systems. The hierarchical control operates in the Dutch sequential energy markets. In particular common assumptions regarding intra-day markets (auction and continuous-time) are discussed as well as the coupling of the different storage systems. The best control policy it is best to follow continuous time intra-day in the summer and the intra-day auction in the winter. This sequential operation comes at the expense of increased battery degradation. Lastly, under our controller, the realized short-term flexibility of the thermal energy storage is marginal compared to the flexibility delivered by stationary battery pack and electric vehicles with bidirectional charging.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"408 ","pages":"Article 127402"},"PeriodicalIF":11.0,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-13DOI: 10.1016/j.apenergy.2026.127375
He Wang , Xiaoqiang Tan , Lihao Li , Chaoshun Li , Alexandre Presas
Pumped-storage hydropower (PSH) remains one of the most reliable and mature large-scale energy-storage technologies and plays a critical role in balancing power systems with high shares of renewable generation. This study addresses the coordination challenge in hybrid systems arising from the differing fast-slow regulation characteristics of fixed and variable-speed units, and proposes a multi-operating condition, cost-aware active predictive control framework that jointly optimizes regulation performance and cost. First, frequency-regulation dynamics and unit response characteristics are analyzed using a mechanistic model, and a linear parameter-varying fast-prediction model that captures multi-operating behavior is derived. An active, condition-prediction-adaptive optimization strategy is formulated, which combines model linearization decomposition, predictive-performance reconstruction and online allocation of control actions. Simulation results demonstrate that the proposed strategy achieves coordinated optimization of integrated regulation performance under multiple constraints, improving regulation reliability and response consistency. Specifically, compared with conventional optimization methods, it reduces the transient frequency deviation by >20 % and maximum unit speed deviation by >30 %, while substantially lowering regulation costs and exploiting the complementary potential across multi-operating conditions. The work provides a systematic technical pathway for the operation and offers valuable insights for improving flexibility of PSH.
{"title":"Coordinated frequency regulation of fixed-variable speed pumped storage hybrid systems: an adaptive control framework integrating dynamic prediction and rolling optimization","authors":"He Wang , Xiaoqiang Tan , Lihao Li , Chaoshun Li , Alexandre Presas","doi":"10.1016/j.apenergy.2026.127375","DOIUrl":"10.1016/j.apenergy.2026.127375","url":null,"abstract":"<div><div>Pumped-storage hydropower (PSH) remains one of the most reliable and mature large-scale energy-storage technologies and plays a critical role in balancing power systems with high shares of renewable generation. This study addresses the coordination challenge in hybrid systems arising from the differing fast-slow regulation characteristics of fixed and variable-speed units, and proposes a multi-operating condition, cost-aware active predictive control framework that jointly optimizes regulation performance and cost. First, frequency-regulation dynamics and unit response characteristics are analyzed using a mechanistic model, and a linear parameter-varying fast-prediction model that captures multi-operating behavior is derived. An active, condition-prediction-adaptive optimization strategy is formulated, which combines model linearization decomposition, predictive-performance reconstruction and online allocation of control actions. Simulation results demonstrate that the proposed strategy achieves coordinated optimization of integrated regulation performance under multiple constraints, improving regulation reliability and response consistency. Specifically, compared with conventional optimization methods, it reduces the transient frequency deviation by >20 % and maximum unit speed deviation by >30 %, while substantially lowering regulation costs and exploiting the complementary potential across multi-operating conditions. The work provides a systematic technical pathway for the operation and offers valuable insights for improving flexibility of PSH.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"408 ","pages":"Article 127375"},"PeriodicalIF":11.0,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-13DOI: 10.1016/j.apenergy.2026.127354
Ayodele Benjamin Esan , Hussain Shareef , Ahmad K. ALAhmad
This study introduces a Lean Multi-Agent Deep Reinforcement Learning (L-MADRL) framework for energy management of networked microgrids (NMGs) with multiple electricity retailers (ERs) and microgrids (MGs) under renewable and load uncertainties. Coordinating energy exchanges in such systems is challenging due to the need for market efficiency, technical feasibility, and scalability. The proposed framework combines a multi-agent Deep Q-Network (DQN) with a single-level reformulation of a bi-level optimization model. In this formulation, the upper level maximizes ER profits and the network’s available transfer capability (ATC), while the lower-level MG cost minimization is replaced by Karush–Kuhn–Tucker (KKT) conditions, yielding a mathematical program with equilibrium constraints (MPEC). This hybrid design offers two benefits: (i) technical constraints such as power flow limits, generator capacities, and market rules are embedded in the MPEC, freeing DRL agents from constraint enforcement and improving learning stability and policy reliability, and (ii) explicit ATC consideration enhances power transfer efficiency and enables network-aware coordination. Performance was evaluated on PJM 5-bus and IEEE 14-bus test systems against deterministic, risk-neutral (RNSO), and risk-averse (RASO) stochastic optimization. Results show that in the 5-bus case, L-MADRL reduced MG costs by 10.3% and increased ER profits by 3.7%, while in the 14-bus case costs decreased by 2.6% and profits rose by 11.4%. L-MADRL also improved ATC, exceeding the best benchmark by 32% in the 5-bus system and by 30% initially and 10% at peak in the 14-bus system. Across all cases, runtimes remained below 3 s, highlighting the framework’s scalability and computational efficiency.
{"title":"Lean multi-agent deep reinforcement learning for uncertainty handling in the energy management of networked microgrids","authors":"Ayodele Benjamin Esan , Hussain Shareef , Ahmad K. ALAhmad","doi":"10.1016/j.apenergy.2026.127354","DOIUrl":"10.1016/j.apenergy.2026.127354","url":null,"abstract":"<div><div>This study introduces a Lean Multi-Agent Deep Reinforcement Learning (L-MADRL) framework for energy management of networked microgrids (NMGs) with multiple electricity retailers (ERs) and microgrids (MGs) under renewable and load uncertainties. Coordinating energy exchanges in such systems is challenging due to the need for market efficiency, technical feasibility, and scalability. The proposed framework combines a multi-agent Deep Q-Network (DQN) with a single-level reformulation of a bi-level optimization model. In this formulation, the upper level maximizes ER profits and the network’s available transfer capability (ATC), while the lower-level MG cost minimization is replaced by Karush–Kuhn–Tucker (KKT) conditions, yielding a mathematical program with equilibrium constraints (MPEC). This hybrid design offers two benefits: (i) technical constraints such as power flow limits, generator capacities, and market rules are embedded in the MPEC, freeing DRL agents from constraint enforcement and improving learning stability and policy reliability, and (ii) explicit ATC consideration enhances power transfer efficiency and enables network-aware coordination. Performance was evaluated on PJM 5-bus and IEEE 14-bus test systems against deterministic, risk-neutral (RNSO), and risk-averse (RASO) stochastic optimization. Results show that in the 5-bus case, L-MADRL reduced MG costs by 10.3% and increased ER profits by 3.7%, while in the 14-bus case costs decreased by 2.6% and profits rose by 11.4%. L-MADRL also improved ATC, exceeding the best benchmark by 32% in the 5-bus system and by 30% initially and 10% at peak in the 14-bus system. Across all cases, runtimes remained below 3 s, highlighting the framework’s scalability and computational efficiency.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"408 ","pages":"Article 127354"},"PeriodicalIF":11.0,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-13DOI: 10.1016/j.apenergy.2026.127361
Faheem Ullah, Md. Mahbub Alam
Offshore wind power, especially from deep-sea floating turbines, is a renewable energy source that has proven its potential thanks to the strength and reliability of available wind resources. This review paper highlights the challenges of deep-sea floating wind turbines, focusing on installation, cost, instability, flow-induced oscillation, failure, maintenance, and optimization to enhance economic feasibility and accelerate wind energy adoption. Deploying floating structures in deep water is theoretically feasible but requires expensive and logistically difficult specialized installation vessels and equipment. Major obstacles include expensive startup and running costs, structural fatigue and wear from vibrations and instability, and material deterioration in harsh environments. While structural stability is a key design achievement, effective maintenance is essential for ensuring turbine reliability, availability, and long-term operation. Enhancing operational cost-effectiveness is closely linked to the adoption of autonomous maintenance technologies, predictive analytics, and advanced control systems. The key to achieving a competitive levelized cost of electricity compared to other energy resources is an optimized floating wind turbine design that minimizes both capital costs and operational expenditure while attaining higher efficiency. To increase the economic feasibility of floating wind turbines and promote the worldwide shift to renewable energy, this study emphasizes the necessity of ongoing research and development throughout all life cycle phases.
{"title":"State-of-the-art review of deep-sea wind turbine: installation, cost, instability, flow-induced oscillation, failure, maintenance, and power cost","authors":"Faheem Ullah, Md. Mahbub Alam","doi":"10.1016/j.apenergy.2026.127361","DOIUrl":"10.1016/j.apenergy.2026.127361","url":null,"abstract":"<div><div>Offshore wind power, especially from deep-sea floating turbines, is a renewable energy source that has proven its potential thanks to the strength and reliability of available wind resources. This review paper highlights the challenges of deep-sea floating wind turbines, focusing on installation, cost, instability, flow-induced oscillation, failure, maintenance, and optimization to enhance economic feasibility and accelerate wind energy adoption. Deploying floating structures in deep water is theoretically feasible but requires expensive and logistically difficult specialized installation vessels and equipment. Major obstacles include expensive startup and running costs, structural fatigue and wear from vibrations and instability, and material deterioration in harsh environments. While structural stability is a key design achievement, effective maintenance is essential for ensuring turbine reliability, availability, and long-term operation. Enhancing operational cost-effectiveness is closely linked to the adoption of autonomous maintenance technologies, predictive analytics, and advanced control systems. The key to achieving a competitive levelized cost of electricity compared to other energy resources is an optimized floating wind turbine design that minimizes both capital costs and operational expenditure while attaining higher efficiency. To increase the economic feasibility of floating wind turbines and promote the worldwide shift to renewable energy, this study emphasizes the necessity of ongoing research and development throughout all life cycle phases.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"408 ","pages":"Article 127361"},"PeriodicalIF":11.0,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-13DOI: 10.1016/j.apenergy.2026.127349
Sweta R. Dash , Mangal S. Yadav , Rakesh K. Sahoo , A.L. Sharma
The development of next-generation energy storage technologies demands innovative material design strategies that can meet performance, scalability, and sustainability requirements. Metal-organic frameworks (MOFs) and their derived transition metal sulfides (TMSs) have attracted significant attention in the field of electrochemical supercapacitors due to their highly tunable architectures, extensive surface areas, and excellent electrical conductivity. This review aims to bridge the knowledge gap between electrochemists and researchers working on MOFs and MOF-derived TMSs. It begins by outlining the fundamental concepts of energy storage systems, including various charge storage mechanisms, while highlighting the critical interdependence among material properties, electrode architecture, and device-level parameters that collectively impact performance. The review then delves into the design principles of MOFs and their derived TMSs, focusing on key parameters that determine their effectiveness in high-rate electrochemical energy storage (EES) applications. Furthermore, it provides a comprehensive discussion on the strategies employed to improve the EES performance of MOF-derived TMSs in comparison to conventional TMS materials, along with their practical implementation in supercapacitor technologies. Finally, special attention is given to detailed investigations of charge storage mechanisms, incorporating both in-situ and ex-situ experimental techniques, and their correlation with theoretical insights derived from density functional theory (DFT) calculations.
{"title":"Recent advances in supercapacitor electrode materials based on MOF-derived transition metal sulfides","authors":"Sweta R. Dash , Mangal S. Yadav , Rakesh K. Sahoo , A.L. Sharma","doi":"10.1016/j.apenergy.2026.127349","DOIUrl":"10.1016/j.apenergy.2026.127349","url":null,"abstract":"<div><div>The development of next-generation energy storage technologies demands innovative material design strategies that can meet performance, scalability, and sustainability requirements. Metal-organic frameworks (MOFs) and their derived transition metal sulfides (TMSs) have attracted significant attention in the field of electrochemical supercapacitors due to their highly tunable architectures, extensive surface areas, and excellent electrical conductivity. This review aims to bridge the knowledge gap between electrochemists and researchers working on MOFs and MOF-derived TMSs. It begins by outlining the fundamental concepts of energy storage systems, including various charge storage mechanisms, while highlighting the critical interdependence among material properties, electrode architecture, and device-level parameters that collectively impact performance. The review then delves into the design principles of MOFs and their derived TMSs, focusing on key parameters that determine their effectiveness in high-rate electrochemical energy storage (EES) applications. Furthermore, it provides a comprehensive discussion on the strategies employed to improve the EES performance of MOF-derived TMSs in comparison to conventional TMS materials, along with their practical implementation in supercapacitor technologies. Finally, special attention is given to detailed investigations of charge storage mechanisms, incorporating both in-situ and ex-situ experimental techniques, and their correlation with theoretical insights derived from density functional theory (DFT) calculations.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"408 ","pages":"Article 127349"},"PeriodicalIF":11.0,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-12DOI: 10.1016/j.apenergy.2026.127399
Junyoung Park , Dongho Choi , Hyukwon Kwon , Taewoo Lee , Eilhann E. Kwon , Jaewon Lee , Hyungtae Cho
This study proposes scalable process for producing alternative aviation fuel from plastic waste, particularly high-density polyethylene (HDPE), through pyrolysis. Prior to process design, HDPE pyrolysis experiments were conducted at 500, 600, and 700 °C to examine temperature effect on aviation fuel production. The aviation fuel yields were 24.0, 20.8, and 3.0 wt% at 500, 600, and 700 °C, respectively, indicating that 500 and 600 °C were most effective. Based on these findings, two aviation fuel production processes (AFP-500 and AFP-600) were developed, integrating pyrolysis at 500 and 600 °C with catalytic cracking. Notably, catalytic cracking was employed to convert wax produced during pyrolysis process. Simulation results showed that HDPE feed rate of 5000 kg h−1 yielded 1523 and 1159 kg h−1 of aviation fuel in AFP-500 and AFP-600, respectively. Techno-economic analysis (TEA) revealed that the levelized cost of production (LCOP) for AFP-500 and AFP-600 were 0.017 and 0.035 USD MJ−1, respectively, indicating that 500 °C is the optimal pyrolysis temperature. Additionally, the LCOP of AFP-500 is 40–77% lower than that of sustainable aviation fuels (SAFs). Life cycle assessment (LCA) results demonstrated net GHG emissions of 0.050 and 0.073 kgCO₂e MJ−1 for AFP-500 and AFP-600, 43% and 18% lower than fossil-based fuel. Eco-efficiency analysis (EEA) was performed to evaluate sustainability of aviation fuel production from HDPE via proposed processes. Aviation fuel produced from HDPE via AFP-500 exhibited the highest eco-efficiency compared with SAFs and that derived from AFP-600. These findings suggest that AFP-500 offers a viable pathway for producing alternative aviation fuel from HDPE.
本研究提出了一种可扩展的工艺,通过热解从塑料废物,特别是高密度聚乙烯(HDPE)中生产替代航空燃料。在工艺设计之前,进行了HDPE在500、600和700℃下的热解实验,以考察温度对航空燃料生产的影响。在500、600和700°C时,航空燃油产率分别为24.0%、20.8%和3.0 wt%,表明500和600°C时最有效。基于这些发现,开发了两种航空燃料生产工艺(AFP-500和AFP-600),将500°C和600°C热解与催化裂化相结合。值得注意的是,催化裂化对热解过程中产生的蜡进行了转化。仿真结果表明,在5000 kg h - 1的HDPE进给量下,AFP-500和AFP-600分别产生1523和1159 kg h - 1的航空燃料。技术经济分析(TEA)表明,AFP-500和AFP-600的平准化生产成本(LCOP)分别为0.017和0.035 USD MJ−1,表明500℃为最佳热解温度。此外,AFP-500的LCOP比可持续航空燃料(SAFs)低40-77%。生命周期评估(LCA)结果表明,AFP-500和AFP-600的温室气体净排放量分别为0.050和0.073 kgCO₂e MJ - 1,比化石燃料低43%和18%。通过生态效率分析(EEA)来评估HDPE航空燃料生产过程的可持续性。通过AFP-500生产的HDPE航空燃料与从AFP-600衍生的SAFs相比,表现出最高的生态效率。这些发现表明,AFP-500为从HDPE中生产替代航空燃料提供了一条可行的途径。
{"title":"Sustainable production of alternative aviation fuel via thermolytic conversion of plastic waste: techno-economic analysis and life cycle assessment","authors":"Junyoung Park , Dongho Choi , Hyukwon Kwon , Taewoo Lee , Eilhann E. Kwon , Jaewon Lee , Hyungtae Cho","doi":"10.1016/j.apenergy.2026.127399","DOIUrl":"10.1016/j.apenergy.2026.127399","url":null,"abstract":"<div><div>This study proposes scalable process for producing alternative aviation fuel from plastic waste, particularly high-density polyethylene (HDPE), through pyrolysis. Prior to process design, HDPE pyrolysis experiments were conducted at 500, 600, and 700 °C to examine temperature effect on aviation fuel production. The aviation fuel yields were 24.0, 20.8, and 3.0 wt% at 500, 600, and 700 °C, respectively, indicating that 500 and 600 °C were most effective. Based on these findings, two aviation fuel production processes (AFP-500 and AFP-600) were developed, integrating pyrolysis at 500 and 600 °C with catalytic cracking. Notably, catalytic cracking was employed to convert wax produced during pyrolysis process. Simulation results showed that HDPE feed rate of 5000 kg h<sup>−1</sup> yielded 1523 and 1159 kg h<sup>−1</sup> of aviation fuel in AFP-500 and AFP-600, respectively. Techno-economic analysis (TEA) revealed that the levelized cost of production (LCOP) for AFP-500 and AFP-600 were 0.017 and 0.035 USD MJ<sup>−1</sup>, respectively, indicating that 500 °C is the optimal pyrolysis temperature. Additionally, the LCOP of AFP-500 is 40–77% lower than that of sustainable aviation fuels (SAFs). Life cycle assessment (LCA) results demonstrated net GHG emissions of 0.050 and 0.073 kgCO₂e MJ<sup>−1</sup> for AFP-500 and AFP-600, 43% and 18% lower than fossil-based fuel. Eco-efficiency analysis (EEA) was performed to evaluate sustainability of aviation fuel production from HDPE via proposed processes. Aviation fuel produced from HDPE via AFP-500 exhibited the highest eco-efficiency compared with SAFs and that derived from AFP-600. These findings suggest that AFP-500 offers a viable pathway for producing alternative aviation fuel from HDPE.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"407 ","pages":"Article 127399"},"PeriodicalIF":11.0,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}