Applied Energy最新文献_第8页

Degradation analysis of dynamic voltage response characteristics of proton exchange membrane fuel cells for health evaluation under dynamic load

IF 10.1 1区工程技术

Applied Energy Pub Date : 2025-03-23 DOI: 10.1016/j.apenergy.2025.125741

Lei Huang , Xuexia Zhang , Yu Jiang , Sidi Dong , Ruike Huang , Hongbo Liao , Shuangxi Tang

{"title":"Degradation analysis of dynamic voltage response characteristics of proton exchange membrane fuel cells for health evaluation under dynamic load","authors":"Lei Huang , Xuexia Zhang , Yu Jiang , Sidi Dong , Ruike Huang , Hongbo Liao , Shuangxi Tang","doi":"10.1016/j.apenergy.2025.125741","DOIUrl":"10.1016/j.apenergy.2025.125741","url":null,"abstract":"<div><div>Accurate health assessment for proton exchange membrane fuel cells (PEMFC) can facilitate early control/maintenance, thereby extending the lifespan and reducing costs. Existing health factors and online characterization of degradation mechanisms are mainly based on voltage or power. However, the dynamic voltage response under the dynamic load cycles and complex conditions poses significant challenges in assessing the degradation states. This paper provides an in-depth understanding of the degradation behavior in the dynamic voltage response. First, a dynamic voltage decomposition method is proposed, using differences in high-frequency impedance obtained from extended distribution of relaxation times (DRT) before and after load changes. Subsequently, a relative transient resistance is introduced to represent and quantify the degradation behavior of different components of the dynamic voltage response. The results show that platinum oxide and gas diffusion account for more than 80 % of the total contribution and they dominate the degradation of the dynamic response. The degradation behavior of each component is investigated in detail. Key determinants are identified and validated through a proposed semi-empirical mechanistic dynamic model (RMSE values are less than 0.0259). Furthermore, Pearson correlation between the polarizations and inductive processes is evaluated with a coefficient of 0.94. Finally, a perspective for extracting health factors considering dynamic responses is proposed. Compared to traditional voltage-based health factors, <em>R</em><sub>eq</sub> and <em>R</em><sub>ne</sub> extracted from the negative resistance equivalent circuit exhibit stronger monotonicity over time, a higher trend-to-variance ratio, and lower time-series complexity, offering significant advantages in health assessment.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"389 ","pages":"Article 125741"},"PeriodicalIF":10.1,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686537","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}

引用次数: 0

Carbon-aware day-ahead optimal dispatch for integrated power grid thermal systems with aggregated distributed resources

IF 10.1 1区工程技术

Applied Energy Pub Date : 2025-03-23 DOI: 10.1016/j.apenergy.2025.125715

Tong Gou , Yinliang Xu , Hongbin Sun

{"title":"Carbon-aware day-ahead optimal dispatch for integrated power grid thermal systems with aggregated distributed resources","authors":"Tong Gou , Yinliang Xu , Hongbin Sun","doi":"10.1016/j.apenergy.2025.125715","DOIUrl":"10.1016/j.apenergy.2025.125715","url":null,"abstract":"<div><div>The accommodation of large-scale renewable energy and distributed resources with uncertainty and variability imposes higher flexibility requirements in integrated energy systems. This article proposes a low-carbon day-ahead optimal scheduling model for the integrated power grid thermal systems. First, the network topology and safety operation constraints of the integrated power grid thermal system are considered to ensure the economical and stable operation of the system. Second, a polyhedral based thermally controllable residential load aggregation/ disaggregation method is proposed to obtain the approximate feasible region and equivalent cost parameters of the aggregator, and the uncertainty of the parameters is modeled through distributed robust chance constraints. Third, on the basis of the theory of carbon emission flow, the carbon potential of the prescheduled power grid thermal system is analyzed to guide the development of resource scheduling strategies. Method studies with different scales of integrated power grid thermal systems were conducted, and the results showed that the proposed model can reduce carbon emissions by 8.67 % and 10.71 %, respectively, while ensuring economic benefits and safety.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"389 ","pages":"Article 125715"},"PeriodicalIF":10.1,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686538","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}

引用次数: 0

Soft costs and EVSE – Knowledge gaps as a barrier to successful projects

IF 10.1 1区工程技术

Applied Energy Pub Date : 2025-03-23 DOI: 10.1016/j.apenergy.2025.125749

Peter Benoliel , Margaret Taylor , Timothy Coburn , Ranjit R. Desai , Stephen Schey , Mindy Gerdes , Peng Peng

{"title":"Soft costs and EVSE – Knowledge gaps as a barrier to successful projects","authors":"Peter Benoliel , Margaret Taylor , Timothy Coburn , Ranjit R. Desai , Stephen Schey , Mindy Gerdes , Peng Peng","doi":"10.1016/j.apenergy.2025.125749","DOIUrl":"10.1016/j.apenergy.2025.125749","url":null,"abstract":"<div><div>There has been a recent push to increase access to electric vehicle (EV) charging infrastructure. The National Electric Vehicle Infrastructure (NEVI) program, part of the Bipartisan Infrastructure Law (BIL) has made significant funding available for major charging infrastructure projects along state thruways, and many state and local incentives exist for EV owners to install chargers in their homes. However, deployment of these chargers has not kept up with demand, primarily due to issues in project planning, permitting processes, and unforeseen delays. This paper serves as a review of the current understanding of these and other non-hardware costs in EV charging infrastructure projects (collectively known as “soft costs”). We found that soft costs in EV charging infrastructure projects are not well understood. Specifically, there is little agreement on how soft costs should be categorized and tracked, and less agreement still on best practices for controlling these costs and lowering barriers to infrastructure deployment. A broader review of EV charging infrastructure cost analyses shows that these costs can have significant impacts on project outcomes. EV charging infrastructure projects may be able to examine the success of the solar industry in lowering soft costs, and a similar effort may lower project costs significantly. Further work on standardizing and collecting data on EV charging infrastructure costs is required to begin addressing and controlling these costs.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"389 ","pages":"Article 125749"},"PeriodicalIF":10.1,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686608","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}

引用次数: 0

Exploring the role of saline water splitting in sustainable energy solutions and hydrogen economy

IF 10.1 1区工程技术

Applied Energy Pub Date : 2025-03-23 DOI: 10.1016/j.apenergy.2025.125733

Mahesh M. Shanbhag , Shanu Mishra , Nagaraj P. Shetti , Bruno G. Pollet , Shankara S. Kalanur

{"title":"Exploring the role of saline water splitting in sustainable energy solutions and hydrogen economy","authors":"Mahesh M. Shanbhag , Shanu Mishra , Nagaraj P. Shetti , Bruno G. Pollet , Shankara S. Kalanur","doi":"10.1016/j.apenergy.2025.125733","DOIUrl":"10.1016/j.apenergy.2025.125733","url":null,"abstract":"<div><div>The use of seawater for hydrogen production via electrolysis is a significant step toward a sustainable hydrogen economy. Over the past decade, research has highlighted the importance of seawater electrolysis (SWE) in future hydrogen infrastructure. This review emphasizes recent advancements in SWE technology that position hydrogen as a bio-inert energy carrier to support renewable energy integration for climate action and carbon neutrality. The key challenges in saline water splitting (SWS), such as seawater's corrosive effects on catalysts and the competing chlorine and oxygen evolution reactions that reduce efficiency, are critically examined. Advancements in electrocatalysis are summarized as a promising approach to developing efficient and corrosion-resistant catalysts for SWS. Catalysts with exceptional hydrogen evolution coupled with low chlorine evolution activities can significantly enhance the performance and economic potential. Significant challenges in SWS, including catalyst scaling and the presence of chloride ions are elaborated and recent developments to overcome these challenges are briefed along with positioning SWS as a promising and sustainable method for hydrogen production. By addressing the multifaceted technical and economic challenges, coupling SWS with industrial process and renewable energy sources could play a pivotal role in meeting future energy demands sustainably, thereby contributing to global efforts in combating climate change and promoting renewable energy solutions.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"389 ","pages":"Article 125733"},"PeriodicalIF":10.1,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686540","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}

引用次数: 0

Role of electrolyte in the polysulfide shuttle effect and long-term cycling performance in cathodes for LiS batteries based on sulfurated polyisoprene

IF 10.1 1区工程技术

Applied Energy Pub Date : 2025-03-23 DOI: 10.1016/j.apenergy.2025.125778

Sadananda Muduli , Jesús M. Blázquez-Moreno , Almudena Benítez , Michael R. Buchmeiser

{"title":"Role of electrolyte in the polysulfide shuttle effect and long-term cycling performance in cathodes for LiS batteries based on sulfurated polyisoprene","authors":"Sadananda Muduli , Jesús M. Blázquez-Moreno , Almudena Benítez , Michael R. Buchmeiser","doi":"10.1016/j.apenergy.2025.125778","DOIUrl":"10.1016/j.apenergy.2025.125778","url":null,"abstract":"<div><div>In this study, we present a one-step and scalable synthesis of sulfurated-poly(isoprene) (SPI) containing 48 wt% covalently bound sulfur that avoids the formation of long-chain polysulfides and the polysulfide shuttle effect. Furthermore, a comprehensive comparative electrochemical study was conducted using three electrolytes, i.e. LiPF<sub>6</sub> in ethylene carbonate (EC): diethyl carbonate (DEC), LiPF<sub>6</sub> in EC: DEC with the addition of 10 wt% of fluoroethylene carbonate (FEC) and LiTFSI in 1,3-dioxolane (DOL): 1,2-dimethoxyethane (DME) with 0.1 M LiNO<sub>3</sub>. LIPF<sub>6</sub>/FEC electrolyte-based cells allow for exceptional capacity at high rates up to 5C, with extraordinary stability over 1100 cycles. This may be attributed to the formation of both a stable cathode electrolyte interface (CEI) and solid electrolyte interphase at the anode (SEI). Furthermore, galvanostatic intermittent titration (GIT) and Randles-Sevcik diffusion studies are conducted to investigate the influence of ionic radius and conductivity of PF<sub>6</sub><sup>−</sup> and TFSI<sup>−</sup> anions on Li<sup>+</sup>-ion diffusion, as well as the formation of fluorinated interlayers between the electrode and electrolyte, as revealed by <em>post-mortem</em> analysis. The kinetics of the electrochemical mechanisms for the LiPF<sub>6</sub>/FEC-based electrolyte are also analyzed, demonstrating an exceptionally high diffusive contribution at elevated rates. In view of the elimination of the shuttle effect and its exemplary electrochemical performance in conjunction with the LiPF<sub>6</sub>/FEC-based electrolyte, SPI is proposed as a potential host material for use as cathodes in Li<img>S batteries.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"389 ","pages":"Article 125778"},"PeriodicalIF":10.1,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Doubling the thermo-osmotic energy conversion efficiency through the reduction of heat and mass transfer resistance

IF 10.1 1区工程技术

Applied Energy Pub Date : 2025-03-23 DOI: 10.1016/j.apenergy.2025.125740

Yifan Zhang, Ji Li, Zikang Zhang, Yubo Tan, Zhichun Liu, Wei Liu

{"title":"Doubling the thermo-osmotic energy conversion efficiency through the reduction of heat and mass transfer resistance","authors":"Yifan Zhang, Ji Li, Zikang Zhang, Yubo Tan, Zhichun Liu, Wei Liu","doi":"10.1016/j.apenergy.2025.125740","DOIUrl":"10.1016/j.apenergy.2025.125740","url":null,"abstract":"<div><div>Enhancing efficiency is crucial to applying low-grade heat energy. Thermo-osmotic energy conversion (TOEC) system is a promising and efficient method to utilize low-grade heat. This study systematically investigates integrating high thermal conductivity network into the liquid chamber to decrease heat transfer resistance and examine the impact of water degassing on the transmembrane resistance. These measures notably boost the system's experimental and theoretical efficiencies, doubling them compared to similar systems. Furthermore, the experimental water flux of a single-stage TOEC system also reaches an attractive value of 56.69 L/m<sup>2</sup>/h. The theoretical model reveals that the 38-stage system attains a peak operational efficiency of 4.72 % and a corresponding power density of 34.05 W/m<sup>2</sup> at heating and cooling temperatures of 80 °C and 40 °C, respectively. This study exhibits a feasible approach for enhancing the efficiency of TOEC system and improving the water yield of pressure-retarded membrane distillation systems.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"389 ","pages":"Article 125740"},"PeriodicalIF":10.1,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686536","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}

引用次数: 0

Imagining a future without fossil fuels: From mid-transition to net zero in a New England environmental justice city

IF 10.1 1区工程技术

Applied Energy Pub Date : 2025-03-21 DOI: 10.1016/j.apenergy.2025.125664

Ogechi Vivian Nwadiaru , Alison Bates , Anna Goldstein , Julia Cantor , Makaylah Cowan , Marina Pineda Shokooh , Krista Harper

{"title":"Imagining a future without fossil fuels: From mid-transition to net zero in a New England environmental justice city","authors":"Ogechi Vivian Nwadiaru , Alison Bates , Anna Goldstein , Julia Cantor , Makaylah Cowan , Marina Pineda Shokooh , Krista Harper","doi":"10.1016/j.apenergy.2025.125664","DOIUrl":"10.1016/j.apenergy.2025.125664","url":null,"abstract":"<div><div>The “mid-transition” - a state in the energy transition where fossil and renewable systems exist in parallel, is one point along the path to a net-zero future. However, if left to chance, the transition to net zero will likely be inequitable and not maximize societal benefits. Using a qualitative approach that incorporates community focus groups and interviews with technical policy experts, energy system specialists, and community activists, we investigate the challenges of moving past the mid-transition to a net-zero economy in our case study city of Holyoke, Massachusetts - which is both a post-industrial Environmental Justice city and boasts a municipally owned utility with the majority of generation being renewable. We analyze community members' perspectives on the energy system and energy transition goals at local, state, and national scales, comparing how these perspectives align and differ from those of experts and decision-makers of energy transition policy makers. Thus, exploring the tension between conceptualizing energy transition policies as a universal good and the challenges of its concrete, local implementation. We find a shared vision for a clean energy future, however, pathways to achieve this goal vary significantly. Policies to move towards net zero are experienced in households in ways that are sometimes unintended leading to divisiveness and ambivalence about climate mitigation policy. Finally, we present community visions for a preferred pathway along the energy transition through inclusive systems planning and policy recommendations to enable policy makers to find common ground and shared priorities with the people directly affected by policy change.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"389 ","pages":"Article 125664"},"PeriodicalIF":10.1,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686535","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}

引用次数: 0

Resilient mobile energy storage resources-based microgrid formation considering power-transportation-information network interdependencies

IF 10.1 1区工程技术

Applied Energy Pub Date : 2025-03-21 DOI: 10.1016/j.apenergy.2025.125716

Jian Zhong , Chen Chen , Haochen Zhang , Wentao Shen , Zhong Fan , Dawei Qiu , Zhaohong Bie

{"title":"Resilient mobile energy storage resources-based microgrid formation considering power-transportation-information network interdependencies","authors":"Jian Zhong , Chen Chen , Haochen Zhang , Wentao Shen , Zhong Fan , Dawei Qiu , Zhaohong Bie","doi":"10.1016/j.apenergy.2025.125716","DOIUrl":"10.1016/j.apenergy.2025.125716","url":null,"abstract":"<div><div>The advancement of smart city technologies has deepened the interactions among power, transportation, and information networks (PTINs). Current mobile energy storage resource (MESR) based power distribution network (PDN) restoration schemes often overlook the interdependencies among PTINs, thus hindering efficient load restoration. This paper outlines the key interacting factors within PTINs, including power supply demand, traffic efficiency, communication coverage, electric vehicle (EV) deployment capability, and PDN controllability. We further develop a PTIN-interacting model to demonstrate the ‘chained recovery effect’ in MESR-based restoration. Building on this, we propose a rolling optimization load restoration scheme utilizing EVs, mobile energy storage systems (MESSs), and unmanned aerial vehicles (UAVs), to restore the power supply to loads. The algorithm optimizes the load restoration schemes by evaluating the criticality of power loads, transportation, and communication nodes and their interdependencies. It further dynamically recalculates subsequent restoration schemes based on the varying states of PTINs during extreme events and the recovery impacts of prior operations on the PTINs, using a rolling horizon. This approach adapts to changing conditions, improving load restoration, enhancing the solution’s adaptability to uncertainties during the restoration process, and increasing its practicality. Additionally, a PTIN-integrated co-simulation platform is developed to verify the effectiveness of the restoration methods. Case studies conducted on the platform show significant improvements in both the restored load capacity and restoration speed of the proposed scheme.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"389 ","pages":"Article 125716"},"PeriodicalIF":10.1,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686414","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}

引用次数: 0

Enhanced photovoltaic-powered distribution network resilience aided by electric vehicle emergency response with willingness and reward

IF 10.1 1区工程技术

Applied Energy Pub Date : 2025-03-21 DOI: 10.1016/j.apenergy.2025.125619

Jun Wang , Yuanlong Zhao , Hongyan Li , Xiao Xu

{"title":"Enhanced photovoltaic-powered distribution network resilience aided by electric vehicle emergency response with willingness and reward","authors":"Jun Wang , Yuanlong Zhao , Hongyan Li , Xiao Xu","doi":"10.1016/j.apenergy.2025.125619","DOIUrl":"10.1016/j.apenergy.2025.125619","url":null,"abstract":"<div><div>With the increasing integration of electric vehicles (EVs) into distribution networks (DNs), leveraging distributed energy resources (DERs) has become essential for mitigating load loss during extreme disaster scenarios. However, the quantification of power support capacity during post-disaster recovery remains inadequate, hindering the optimization of emergency resource deployment. This paper presents a novel two-phase resilience enhancement strategy for DNs, addressing both pre-disaster and post-disaster stages. The strategy includes willingness-reward dual parameter settings to characterize the power support capacity of EV aggregators. DERs are utilized to quickly connect to DNs and provide emergency power after a disaster. In the pre-disaster phase, a two-stage iterative model is developed for mobile energy storage systems (MESS) pre-positioning and DN topology reconfiguration. The post-disaster recovery is formulated as a mixed-integer second-order cone programming model to depict the emergency response of EVs. EV charging stations (EVCS) are aggregated using a fuzzy membership approach to calculate their support power. Sensitivity analysis shows that optimizing EVCS willingness-reward dual parameter settings can significantly enhance power support. Numerical results demonstrate a 48.23 % reduction in load shedding costs through MESS pre-positioning, and a 66.6 % improvement in resilience metrics with optimized willingness-reward dual parameter settings.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"389 ","pages":"Article 125619"},"PeriodicalIF":10.1,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686604","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}

引用次数: 0

Primary frequency regulation performance in hydropower systems: Precise quantification and holistic enhancement under wide-range operation 水电系统的一次频率调节性能：大范围运行下的精确量化和整体提升

IF 10.1 1区工程技术

Applied Energy Pub Date : 2025-03-20 DOI: 10.1016/j.apenergy.2025.125711

Xueding Lu , Chaoshun Li , Hao Chang , He Wang , Zhiwei Zhu , Dong Liu , Xiaoqiang Tan , Rongli Xu

{"title":"Primary frequency regulation performance in hydropower systems: Precise quantification and holistic enhancement under wide-range operation","authors":"Xueding Lu , Chaoshun Li , Hao Chang , He Wang , Zhiwei Zhu , Dong Liu , Xiaoqiang Tan , Rongli Xu","doi":"10.1016/j.apenergy.2025.125711","DOIUrl":"10.1016/j.apenergy.2025.125711","url":null,"abstract":"<div><div>Numerous hydropower units are shifting to wide-range operation (WRO, head variation is over 7 % of the rated head, and power adjustment range is more than 50 % of the rated power.), which increases the risk of failing the primary frequency regulation (PFR) assessments from the power grid. To precisely quantify and holistically enhance the PFR performance. Firstly, a flexible hydro-turbine regulation system (HTRS) simulation platform with modular subsystem switching is established to facilitate various operating conditions and comparative studies. Secondly, Prony identification is introduced to determine the stable range of the complex nonlinear HTRS, which saves more than 90 % calculation time and is more accurate compared to traditional methods. On this basis, the influence of operating conditions and major nonlinear factors on the system stability are analyzed. Finally, the regulation rise time, stable time, and integrated electricity isotropic performance indexes for PFR are designed to quantitatively evaluate the regulating quality and assessment status under WRO, with further integrated optimization of control parameters. Results indicate that the risk of units failing PFR assessments is higher during low-head operation, with the main cause being a decrease in regulation speed. Following optimization, units successfully pass the PFR assessment in all operating conditions, with the three performance indexes improved by an average of 12.1 %, 78.9 %, and 87.8 % under WRO, respectively. This study offers a reliable tool and essential guidance for analyzing and optimizing the regulation performance of hydropower units under WRO.</div></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":"389 ","pages":"Article 125711"},"PeriodicalIF":10.1,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686413","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}

引用次数: 0