International Journal of Electrical Power & Energy Systems最新文献

{"title":"Risk of oscillations induced collectively by multiple DFIGs and PMSGs in a wind power collecting system","authors":"Zhengnan Zhao ,&nbsp;Wenjuan Du ,&nbsp;Qiang Fu ,&nbsp;Xiao Chen ,&nbsp;Yijun Wang ,&nbsp;H.F. Wang","doi":"10.1016/j.ijepes.2025.111144","DOIUrl":"10.1016/j.ijepes.2025.111144","url":null,"abstract":"<div><div>It has been found that same type of multiple wind turbine generators (WTGs), either PMSGs or DFIGs, in a grid-connected wind farm may collectively cause growing oscillations. This paper investigates the risk of oscillations induced collectively by both the DFIGs and PMSGs in a wind power collecting system (WPCS). Analysis is carried out to indicate that if the PMSGs and the DFIGs happen to have components, such as the phase-locked loops (PLLs) or converter control loops, bandwidths of which fall in the same range such that their dynamics are similar, it is possible that multiple DFIGs and PMSGs may jointly induce growing oscillations. Three study cases are presented to validate and demonstrate the analysis and conclusions made in the paper about dynamics interactions between (1) The PLLs equipped by multiple DFIGs and PMSGs; (2) The PLLs of a group of the DFIGs and the DC voltage control loops of another cluster of the PMSGs. The DFIGs and the PMSGs collectively cause growing oscillations, though the dynamics of the DFIGs and PMSGs are completely different. The oscillation risk increases when more DFIGs or/and PMSGs are connected in the WPCS.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"172 ","pages":"Article 111144"},"PeriodicalIF":5.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating optimal replacement time for systems with two-state degradation and technological obsolescence","authors":"Raymon van Dinter ,&nbsp;Sander Rieken ,&nbsp;Bedir Tekinerdogan ,&nbsp;Cagatay Catal","doi":"10.1016/j.ijepes.2025.111137","DOIUrl":"10.1016/j.ijepes.2025.111137","url":null,"abstract":"<div><div>This paper presents a method to estimate the optimal replacement time of systems subject to two-state degradation processes while accounting for technological obsolescence. We apply this method to cable joints, where the two states represent a functional state and a degraded state characterized by partial discharge activity. Using more than 10 years of data from online partial discharge monitoring and historical failure records, we estimate the parameters for our statistical survival models. These models are then used to simulate degradation processes and associated costs over a finite time horizon, enabling the determination of the optimal replacement time. We illustrate the methods with two use cases: one in which immediate replacement is optimal and another in which delaying replacement yields the best outcome. To quantify the uncertainty in the optimal replacement time, we employed bootstrapping and the delta method during the simulation process.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"172 ","pages":"Article 111137"},"PeriodicalIF":5.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing regional energy networks: A hierarchical multi-energy system approach for enhanced efficiency and privacy","authors":"Chengwei Lou ,&nbsp;Wenxun Zhou ,&nbsp;Wei Tang ,&nbsp;Lu Zhang ,&nbsp;Jin Yang","doi":"10.1016/j.ijepes.2025.111125","DOIUrl":"10.1016/j.ijepes.2025.111125","url":null,"abstract":"<div><div>This research presents a hierarchically synchronized Multi-Energy System (MES) designed for regional communities, incorporating a network of small-scale Integrated Energy Microgrids (IEMs) to augment efficiency and collective advantages. The MES framework innovatively integrates energy complementarity pairing algorithms with efficient iterative optimization processes, significantly curtailing operational expenditures for constituent microgrids and bolstering both community-wide benefits and individual microgrid autonomy. The MES encompasses electricity, hydrogen, and heat resources while leveraging controllable assets such as battery storage systems, fuel cell combined heat and power units, and electric vehicles. A comparative study of six IEMs demonstrates an operational cost reduction of up to 26.72% and a computation time decrease of approximately 97.13% compared to traditional methods like ADMM and IDAM. Moreover, the system preserves data privacy by limiting data exchange to aggregated energy information, thus minimizing direct communication between IEMs and the MES. This synergy of multi-energy complementarity, iterative optimization, and privacy-aware coordination underscores the potential of the proposed approach for scalable, community-centered energy systems.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"172 ","pages":"Article 111125"},"PeriodicalIF":5.0,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization operational framework of virtual power plant based on dynamic information entropy assessment approach","authors":"Weiming Luo ,&nbsp;Jiekang Wu ,&nbsp;Shengyu Chen ,&nbsp;Wenhao Tang ,&nbsp;Mingzhao Xie ,&nbsp;Mingzhi Hong ,&nbsp;Qijian Peng ,&nbsp;Yaoguo Zhan ,&nbsp;Wenjing Liu","doi":"10.1016/j.ijepes.2025.111143","DOIUrl":"10.1016/j.ijepes.2025.111143","url":null,"abstract":"<div><div>The inherent uncertainty and volatility in distributed energy resources pose significant challenges to the stable operation of virtual power plants. Existing optimization methods for virtual power plants may not adequately address the cumulative impact of uncertainties in operation. This study develops a hydrogen-buffered time-shifting regulation mechanism to suppress uncertainty accumulation, establishing an information entropy-driven optimization framework for the hydrogen-buffered multi-carrier virtual power plant. In the assessment phase, the information entropy approach is used to evaluate the confidence level of the forecasted output power from distributed energy resources, enabling dynamic adjustment of the optimization scheduling constraints. During the operation optimization phase, hydrogen energy is utilized as a backup power source, with hydrogen storage capacity and operational cost as the objective functions. A two-stage multi-objective optimization model is established and solved using the zero-sum game weighting method. This approach enhances system feasibility through dynamic constraint relaxation, effectively mitigating uncertainty accumulation. Finally, the <span><math><mi>α</mi></math></span> steady-state distribution is utilized to generate operational scenarios. Simulations are analyzed over multiple consecutive run cycles. The findings indicate that the proposed method is capable of reducing operating costs by 24.92%, while concurrently meeting the established reliability constraints. The proposed method has the capacity to develop flexible and efficient operation strategies in the context of uncertainty.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"172 ","pages":"Article 111143"},"PeriodicalIF":5.0,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transient stability analysis for grid following converters in low-inertia power systems by direct method","authors":"Fangyuan Sun ,&nbsp;Ruisheng Diao ,&nbsp;Ruiyuan Zeng ,&nbsp;Zhanning Liu ,&nbsp;Baorong Zhou ,&nbsp;Junjie Li ,&nbsp;Wangqianyun Tang","doi":"10.1016/j.ijepes.2025.111155","DOIUrl":"10.1016/j.ijepes.2025.111155","url":null,"abstract":"<div><div>With the increased penetration of renewable energy and reduced proportion of synchronous generators, the low-inertia characteristics of today’s power system become prominent, and the transient stability issue of grid following converter (GFLC) under low inertia system (LIS) condition becomes critical. There are two prominent problems in the transient stability analysis of GFLC-LIS: The angular dynamic of LIS increases the complexity of transient stability analysis, and the nonlinear, possibly negative damping of GFLC makes it difficult to guarantee the conservative of the traditional methods. These problems make the traditional methods inapplicable. In this paper, the transient stability analysis of GFLC-LIS is investigated to provide an accurate estimation of the attraction boundary and critical clearance time (CCT). Firstly, a dynamic model of GFLC-LIS is constructed, considering the phase-locked loop (PLL)-based GFLC dynamics and swing equation-based LIS dynamics. The frequency mutation of PLL at fault occurrence and clearing time is also considered. Secondly, a Zubov-based transient stability analysis method is proposed, which can construct the energy function in a way that is different from the traditional conservation of energy perspective and can address the negative damping issue. Moreover, the accuracy of the CCT estimation is analyzed, and the influences of LIS parameters on transient stability are illustrated. Finally, simulation experiments are carried out to verify the effectiveness of the proposed method.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"172 ","pages":"Article 111155"},"PeriodicalIF":5.0,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physical propagation and anomaly identification of transformer with HVDC&RTTS stray current invasion","authors":"Chao Pan,&nbsp;Tongrui Fu,&nbsp;Jingge An,&nbsp;Jiaxing Gao,&nbsp;Shoukun Zou,&nbsp;Zhenglong Sun","doi":"10.1016/j.ijepes.2025.111159","DOIUrl":"10.1016/j.ijepes.2025.111159","url":null,"abstract":"<div><div>Aiming at the operation stability of the transformer with stray current invasion, the evolution and propagation of multiple information is investigated in this paper. Firstly, the morphological characteristics of stray current are comparatively analyzed based on the measured data. The persistence and fluctuation of the stray current are characterized by characteristic factors (DC factor and mutation factor). Then, the characteristic factors are associated with abnormal features by sequential coupling. The virtual simulation model of transformer is constructed to simulate the electromagnetic, force, vibration and noise of components, and the laws are summarized. The results show that the vibration and noise become significant with the increase of the DC factor, and the distortion of the time domain waveform becomes serious with the increase of the mutation factor. Through the dynamic experiment platform, the physical entity of the transformer is constructed, obtaining multiple information in different modes. The correctness of the conclusions is verified by the calibration of virtual-physical consistency. On this basis, the multi-mode-state characteristic information domain is formed. The mapping relationship between stray current and vibration noise is studied with characteristic factors. Meanwhile, the abnormality of multiple information can be effectively characterized with characteristic factors. The instability criterion of transformer is established and the state interval is classified, which provides ideas for life-cycle assessment and information-physical fusion of transformer.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"172 ","pages":"Article 111159"},"PeriodicalIF":5.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization scheduling strategy of high energy-consumption industrial park participation in green certificate trading and carbon emission trading","authors":"Xiaoou Liu","doi":"10.1016/j.ijepes.2025.111169","DOIUrl":"10.1016/j.ijepes.2025.111169","url":null,"abstract":"<div><div>Electrolytic aluminum production has been one of high energy consuming industries. It still relies on fossil-fired units and has a serious problem of carbon emissions. The transformation of high energy-consuming industrial park (HEIP) to low-carbon economy is imminent. New opportunity is bought by the coupling of green certificate trading (GCT) and carbon emission trading (CET) provides for HEIP to participate in power and carbon markets. Therefore, this paper proposes an optimization scheduling strategy for HEIP participating in both GCT and CET. Firstly, the operational characteristics of carbon capture power plant (CCPP) with flue gas bypass and liquid storage tank were studied. The advantage of CCPP was also analyzed. Secondly, the entire process of electrolytic aluminum production was introduced, along with its demand response model. Then, the correlation mechanism between GCT and CET was studied, in order to promote energy conservation and emission reduction in HEIP. On this basis, an optimal dispatch model for HEIP was established based on distributionally robust chance constraint (DRCC). The uncertainty risk in both sources and loads can be quantified by conditional value at risk (CVaR). Finally, the effectiveness of the proposed strategy was verified by Baotou Aluminum Industry “source-network-load-storage integrated project”. The results would contribute to reducing the carbon emissions and total cost of HEIP, and improving renewable energy utilization capacity. It has extendable and utility value to low-carbon economy development of HEIP.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"172 ","pages":"Article 111169"},"PeriodicalIF":5.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing graphical network design using fuzzy hypersoft topologies and multi-criteria VIKOR decision algorithms","authors":"Shabana Anwar ,&nbsp;Muhammad Kamran Jamil ,&nbsp;Hothefa Shaker Jassim ,&nbsp;Muhammad Azeem ,&nbsp;Bandar Almohsen ,&nbsp;Husam A. Neamah","doi":"10.1016/j.ijepes.2025.111134","DOIUrl":"10.1016/j.ijepes.2025.111134","url":null,"abstract":"<div><div>The accumulated data is displayed in the form of a figure called a graph. The notion of fuzziness was developed in graph theory to address issues not resolved by crisp graph theory. However, fuzzy soft ideas in graph theory, which is a parameterized family and provides more exact and generalized solutions to answer vague and ambiguous problems, can yield more generalized conclusions. Fuzzy hypersoft is another broader and more generic soft set, which is the Cartesian product of disjoint attribute-valued sets corresponding to distinct attributes, in which mapping is transformed into a multi-attribute. The number of fuzzy hypersoft subgraphs is equal to the cardinality of the set obtained after taking the Cartesian product of disjoint attributed valued sets, which could be applied in graph theory to get surprising results. The novelty of this manuscript is defining topological numbers for the first time in a fuzzy hypersoft environment. We have also initiated the definitions of path graph, cycle graph, complete graph, wheel graph, and star graph, and calculated the degrees of nodes of each graph in a fuzzy hypersoft environment. Then, we have derived some generalized results for these fuzzy hypersoft families of graphs for the first Zagreb number, the second Zagreb number, and the Randic number. This is also a novel approach that we have converted the decision-making algorithm, vizierkriterijumsko kompromisno rangiranje (VIKOR), into a fuzzy hypersoft framework. Our objectives are to lessen the complexity in the approaches and to establish a solid relationship with the multi-criteria decision-making procedures. It is intriguing that the decision-making issue can be addressed with hypersoft theory without the restrictions on the decision-maker’s choice of values. In the end, we have presented an application to highlight the generic nature of the fuzzy hypersoft environment. We also have examined the best graphical network to maximize profit for a four-partner corporation, taking into account fuzzy hypersoft topological numbers as decision-makers. Then, VIKOR in the fuzzy hypersoft framework is used for the same purpose. The acquired results are enough to prove that the graphical network for yielding maximum profit is the same by applying MCDM as well as by applying the formulas of different topological numbers. Furthermore, we have presented the AHP method’s methodology and eventually employed it to determine the top-ranked graphical network among commercial enterprises. Furthermore, a comparison has been made between fuzzy soft topological numbers and fuzzy hypersoft topological numbers.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"172 ","pages":"Article 111134"},"PeriodicalIF":5.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-rate simulation of integrated electricity and gas systems: formulation of algorithm and equivalent circuit model for network simulators","authors":"Ruikai Song ,&nbsp;Songhuai Du ,&nbsp;Yue Xia ,&nbsp;Kai Strunz ,&nbsp;Shaahin Filizadeh ,&nbsp;Juan Su","doi":"10.1016/j.ijepes.2025.111118","DOIUrl":"10.1016/j.ijepes.2025.111118","url":null,"abstract":"<div><div>The emergence of multi-energy networks, comprising electricity and natural gas (NG), presents novel and complex challenges to the comprehensive analysis of energy systems. Energy systems based on electricity and gas adhere to distinct physical laws and mathematical representations. As attention and interest in integrated electricity and gas systems (IEGS) grow, expanding the scope of applying electrical analogies to pneumatic quantities is advantageous. The objectives of this paper are to implement the extension of this analogy and to conduct a multi-rate simulation of IEGS. It shows how the NG pipeline and gas compressor station (GCS) can be modeled using basic electric elements for the simulation of pneumatic transients. The primary objective of devising the multi-rate algorithm is to attain greater efficiency during the computational procedure. The target system is partitioned into an electrical network subsystem (ENS) and a gas network subsystem (GNS). Different time steps are adopted in the simulation of these subsystems. A novel interface model based on gas turbines is proposed to represent the interactions between ENS and GNS. A comparatively large time-step size is used in the GNS for accelerated computations. The multi-rate simulation algorithm is accompanied by validation and application to demonstrate its effectiveness in enabling efficient simulation of IEGS.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"172 ","pages":"Article 111118"},"PeriodicalIF":5.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An interpretable multi-dimensional feature space-based fault diagnosis method for UHVDC transmission line","authors":"Qingwu Gong,&nbsp;Haojie Zhang","doi":"10.1016/j.ijepes.2025.111157","DOIUrl":"10.1016/j.ijepes.2025.111157","url":null,"abstract":"<div><div>Accurate and rapid fault diagnosis is critical to the safe and stable operation of ultra-high-voltage direct current transmission systems. The limited protection time window restricts fault feature extraction and may result in protection misoperations, especially under complex fault conditions. To address these challenges, a novel diagnostic approach is proposed based on multi-dimensional feature space construction guided by fault information distribution. Physically interpretable features are first derived through circuit-theoretic analysis to ensure strong physical relevance. Principal Component Analysis is then applied to capture dominant statistical characteristics and reduce feature redundancy. XGBoost is subsequently employed to model nonlinear feature interactions and improve classification accuracy. Furthermore, SHapley Additive exPlanations are integrated to quantify individual feature contributions, facilitating feature space optimization and enhancing model interpretability. Simulation results show that the proposed method achieves accurate fault identification within a 1 ms window under fault resistances up to 500 <span><math><mi>Ω</mi></math></span> and maintains robust performance across varying sampling frequencies.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"172 ","pages":"Article 111157"},"PeriodicalIF":5.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}