International Journal of Electrical Power & Energy Systems最新文献

{"title":"Dual-layered deep learning and optimization algorithm for electric vehicles charging infrastructure planning","authors":"Bishoy E. Sedhom ,&nbsp;Abdelfattah A. Eladl ,&nbsp;Pierluigi Siano ,&nbsp;Magda I. El-Afifi","doi":"10.1016/j.ijepes.2025.110545","DOIUrl":"10.1016/j.ijepes.2025.110545","url":null,"abstract":"<div><div>This study aims to develop a robust optimization framework for accurately forecasting electric vehicle (EV) loads and strategically placing EV charging stations (EVCSs) within distribution networks to enhance grid stability and efficiency. EVs offer substantial environmental benefits but pose challenges to power grids due to capacity constraints. To address these issues, a dual-layered deep learning method, combining Autoregressive Integrated Moving Average (ARIMA) and Long Short-Term Memory (LSTM), is employed for precise EV load prediction. Additionally, a Hybrid Archimedes-Genetic (HAG) algorithm, integrating the Archimedes Optimization Algorithm (AOA) and Genetic Algorithm (GA), is proposed to optimize EVCS locations. This multi-objective approach aims to minimize active and reactive power losses while reducing the average voltage deviation index (AVDI). Two case studies were conducted using MATLAB and Python: the first predicted EV power demands, while the second identified optimal EVCS locations in IEEE 33-node and 69-node test systems. Results demonstrate that the HAG method outperforms GA, Particle Swarm Optimization, and AOA individually. For the 33-bus system, active and reactive power losses decreased by 33 % and 33.01 %, respectively, with an AVDI of 0.004. In the 69-bus system, losses were reduced by 19.38 % and 16.76 %, with an AVDI of 0.0014. These findings highlight the HAG method’s effectiveness in optimizing EVCS placement, improving grid performance, and maximizing the benefits of EV adoption.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"166 ","pages":"Article 110545"},"PeriodicalIF":5.0,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Frequency analysis and calculation of transformer neutral DC caused by metro stray currents","authors":"Aimin Wang ,&nbsp;Sheng Lin ,&nbsp;Qi Zhou ,&nbsp;GuoXing Wu ,&nbsp;Xiaopeng Li ,&nbsp;Jun Liu ,&nbsp;Hongbo Cheng","doi":"10.1016/j.ijepes.2025.110531","DOIUrl":"10.1016/j.ijepes.2025.110531","url":null,"abstract":"<div><div>Metro stray currents flowing into transformers can lead to high-level transformer neutral direct current (TNDC). Since the TNDC is not constant and varies with time randomly, the frequency characteristics of TNDC are confusing and unclear, which will lead to complex transformer electromagnetic characteristics and increase the difficulty of transformer protection and DC bias mitigation. Therefore, it is important to understand the frequency characteristics of TNDC caused by stray currents. To address this issue, this paper performs extensive tests on TNDC. Through the detailed frequency analysis of the test data, the relationship between the main frequencies of neutral DC and metro train time headway is found. To further explain this relationship, a frequency calculation modeling method of TNDC is proposed, in which the traction current along the metro line is innovatively equivalent to impulse and shock frequency signals. Then, comparing the calculation result of the main frequency with the test data, the proposed model is verified. Moreover, the relationship between the main frequency and train time headway is explained and clarified based on the model. Furthermore, the effect of train time headway and dwell time is analyzed. The results show that with the train time headway decreasing and dwell time increasing, the complexity of the neutral DC frequency distribution increases to some extent.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"166 ","pages":"Article 110531"},"PeriodicalIF":5.0,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analyzing the effect of corona losses on dynamic line rating models for overhead transmission lines","authors":"Jordi-Roger Riba,&nbsp;Manuel Moreno-Eguilaz","doi":"10.1016/j.ijepes.2025.110546","DOIUrl":"10.1016/j.ijepes.2025.110546","url":null,"abstract":"<div><div>High-voltage transmission lines tend to generate corona activity. The value of corona losses is highly dependent on several parameters such as line configuration, conductor geometry, surface condition, operating voltage and weather conditions. International guidelines and standards such as Cigré, IEEE and IEC recommend that corona losses should not be considered when developing thermal conductor models, so such losses are typically omitted when developing dynamic line rating (DLR) applications. DLR is a set of techniques based on dynamically changing the thermal ratings of transmission lines based on changes in environmental conditions (wind, temperature, etc.). To develop accurate DLR models that include corona losses, a large amount of line data is required, including operating voltage, complete conductor information (materials, dimensions, etc.), bundle and line geometry, phase layout, and ground clearance, among others. To validate the accuracy of such models, part of the complete line data, long-term measurements of instantaneous corona losses in existing lines, operating voltage and weather conditions are required. However, the development of DLR approaches and the inclusion of corona losses in such models is severely limited by the lack of experimental work that includes a complete description of all this information. Based on experimental corona losses already published in the literature, this paper uses an accurate conductor model that accounts for radial heat transfer to show that, under certain conditions, corona losses are comparable to and even greater than Joule losses, which are usually the main source of conductor heating, suggesting that corona losses should be included in the development of accurate thermal conductor models. It has also been shown that for conductors in a normal condition, operating in fair weather conditions and at rated line load, corona losses are typically less than 2% of the Joule losses, resulting in a reduction of the maximum current carrying capacity of less than 1%. However, for heavily contaminated conductors, the reduction in current carrying capacity due to the effect of corona losses can be as high as 15%.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"166 ","pages":"Article 110546"},"PeriodicalIF":5.0,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pulsating power mitigation in poly-source DC microgrids with single-phase inverters: A theoretical analysis","authors":"Gleisson Balen,&nbsp;Cristian Blanco,&nbsp;Ángel Navarro-Rodríguez,&nbsp;Pablo García","doi":"10.1016/j.ijepes.2025.110452","DOIUrl":"10.1016/j.ijepes.2025.110452","url":null,"abstract":"<div><div>This paper describes a method to reduce the DC bus power oscillation in a multi-home building AC–DC hybrid microgrid containing renewable resources, energy storage elements, and building loads. In general, the connection of several single-phase inverters to a DC bus to supply AC loads generates a double-frequency power oscillation in the DC link. Usually, each single-phase inverter has a random voltage phase angle reference and a different load power factor that strongly influences the DC bus power quality. To solve this problem, a method is proposed to ensure a minimum power oscillation. The adopted strategy considers a lead controller, which calculates the optimal voltage reference phase angle for each inverter, considering the load apparent power and power factor. A theoretical analysis is presented, and a method for minimizing unwanted components on the DC bus is proposed. The proposed method is based on the correct definition of the AC reference phase of each single-phase converter by implementing a gradient descent optimization algorithm. The paper shows a verification with real AC load profiles, performing the DC bus power low-frequency oscillation mitigation, reaching a 95% power oscillation reduction.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"166 ","pages":"Article 110452"},"PeriodicalIF":5.0,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Power-speed coupling response characteristics of variable speed pumped storage unit under pumping mode","authors":"Rui Cao ,&nbsp;Wencheng Guo ,&nbsp;Chao Wang","doi":"10.1016/j.ijepes.2025.110544","DOIUrl":"10.1016/j.ijepes.2025.110544","url":null,"abstract":"<div><div>Variable speed pumped storage unit (VSPSU) has the advantage of adjustable power under pumping mode, which can better meet the regulation demand of power grid. This paper aims to study the power-speed coupling response characteristics (CRCs) of VSPSU under pumping mode. Firstly, the model of VSPSU under pumping mode is established, and the power-speed CRCs are revealed. Then, the influence of regulating parameters on the power-speed CRCs is explored. Finally, the influence mechanism of power regulation of VSPSU is clarified. The results show that the VSPSU can realize power regulation by adjusting the speed through the frequency convertor. The transient response processes of power and speed are basically consistent in the overall trend, but the regulation quality of speed is better than that of power. The regulating parameters of the speed outer loop of frequency converter have obvious influence on the power-speed CRCs of VSPSU, but the regulating parameters of current inner loop of the frequency converter and the governor have little effect. With the decrease of initial speed or the increase of speed regulation amplitude, the power regulation amplitude increases, and the power regulation amplitude under decreased speed regulation scenarios is greater than that under increased speed regulation scenarios. When the power regulation amplitude is the same under different working heads, the speed regulation amplitude decreases with the increase of working head, and the speed regulation amplitude under decreased power regulation scenarios is smaller than that under increased power regulation scenarios.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"166 ","pages":"Article 110544"},"PeriodicalIF":5.0,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A non-iterative distributed approximate dynamic programming algorithm for frequency security-constrained stochastic economic dispatch","authors":"Xiangyong Feng ,&nbsp;Shunjiang Lin ,&nbsp;Yutao Liang ,&nbsp;Yanghua Liu ,&nbsp;Mingbo Liu","doi":"10.1016/j.ijepes.2025.110543","DOIUrl":"10.1016/j.ijepes.2025.110543","url":null,"abstract":"<div><div>Due to uncertainties associated with the power output of offshore wind farms, the active power balance and frequency security control of power systems with lots of offshore wind farms are highly challenging. To address this problem, in this study, a new stochastic economic dispatch model of a power system with offshore wind farms considering the system frequency security constraints is established to obtain economic and secure dispatch decisions. Furthermore, the nonlinear convexity of frequency security constraints provides considerable theoretical support for the global optimality of decision-making, and a golden section search-based approximate linear constraint generation algorithm is designed to approximate nonlinear frequency security constraints for improving computational efficiency. Next, a non-iterative distributed approximate dynamic programming algorithm based on the equivalent projection method is designed for the distributed solution of the established model. In the algorithm, first, the model is decoupled from time periods. Next, the high-dimensional feasible region of the offshore wind farm optimization model is projected into a low-dimensional feasible region and substituted into the transmission grid optimization model, and solves the models of the transmission grid and the offshore wind farms sequentially to achieve the non-iterative distributed solution. Finally, case studies on a modified IEEE 39-bus system with two offshore wind farms and an actual provincial system with seven offshore wind farms demonstrate the effectiveness and superiority of the proposed model and algorithm, reducing solution time by over 86.4% compared to the alternating direction method of multipliers-based distributed approximate dynamic programming algorithm.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"166 ","pages":"Article 110543"},"PeriodicalIF":5.0,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive overview of high-speed solid-rotor induction machines: Applications, classification, and multi-physics modeling","authors":"Vladimir Bilek ,&nbsp;Jan Barta ,&nbsp;Marek Toman ,&nbsp;Petr Losak ,&nbsp;Gerd Bramerdorfer","doi":"10.1016/j.ijepes.2025.110520","DOIUrl":"10.1016/j.ijepes.2025.110520","url":null,"abstract":"<div><div>Solid-rotor induction machines have gained significant attention in various industrial applications due to their robustness, reliability, and cost-effectiveness. This paper presents a comprehensive overview of these machines, covering their classification and various applications. The paper starts with discussing the widespread usage of solid-rotor induction machines in numerous industry sectors, including manufacturing, transportation, and renewable energy generation. The ability to operate under harsh environmental conditions and in safety-critical settings has made these machines indispensable in many fields of engineering. Their detailed classification based on different rotor topologies is provided, highlighting the unique design features and performance characteristics of each category. Simple and hybrid configurations and their distinct advantages and limitations in specific applications are included. This paper further explores the essential aspects of multi-physics modeling of solid-rotor induction machines, incorporating electromagnetic, mechanical, and thermal considerations to gain deep insights into the complex interactions between components and to guide the optimization process for enhanced performance and efficiency. This work is intended as a valuable reference for researchers and engineers seeking a comprehensive understanding of solid-rotor induction machines, from their diverse applications to the intricacies of their electromagnetic, thermal, and mechanical modeling. By shedding light on these aspects, this work contributes to the advancement and utilization uptake of these machines in modern industrial settings.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"166 ","pages":"Article 110520"},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cooperative optimal operation of multi-microgrids and shared energy storage for voltage regulation of distribution networks based on improved Nash bargaining","authors":"Keyu Zhang ,&nbsp;Jian Chen ,&nbsp;Xianglong Qi ,&nbsp;Wen Zhang ,&nbsp;Meijia Wei ,&nbsp;Da Lin","doi":"10.1016/j.ijepes.2025.110532","DOIUrl":"10.1016/j.ijepes.2025.110532","url":null,"abstract":"<div><div>The increasing penetration rate of distributed generation will bring serious voltage violation issues to the distribution networks (DNs). As an effective organization form of distributed generation, microgrids (MGs) have flexible adjustment ability, which can provide voltage support for DNs. To enhance the energy economy and scheduling flexibility of MGs, shared energy storage system (SESS) has received widespread attention as a new type of energy storage technology. To this end, this paper proposes a cooperative optimal operation strategy of MGs and SESS aimed at voltage regulation in DNs. A two-stage cooperative optimization model based on Nash bargaining theory is established for MGs and SESS. In the first stage, the DN is partitioned using an improved electrical distance approach that incorporates voltage regulation incentives, with the objective of minimizing the cooperation costs for MGs and SESS. The second stage involves quantifying the contributions of each participant through a nonlinear energy mapping function, followed by the development of the trading price based on asymmetric bargaining informed by improved Nash bargaining. The goal of this approach is to ensure that MGs and SESS share cooperative benefits fairly. The alternating direction method of the multiplier (ADMM) is used to solve the problems, effectively protecting the privacy of each participating subject. Finally, the effectiveness of the proposed method is demonstrated through an analysis of the improved IEEE 33-node system.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"166 ","pages":"Article 110532"},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A two-stage active current limiting control coordinated protection scheme for multi-terminal MMC-HVDC grid","authors":"Yao Sun ,&nbsp;Junjie Hou ,&nbsp;Yanfang Fan ,&nbsp;Guobing Song","doi":"10.1016/j.ijepes.2025.110530","DOIUrl":"10.1016/j.ijepes.2025.110530","url":null,"abstract":"<div><div>The inherent flexible and controllable characteristics of the multi-terminal flexible DC grid based on modular multilevel converters (MMCs) have opened up new avenues for the research on fault current limitation and line fault identification. Existing active current limitation control strategies and fault identification methods operate independently, without considering their interplay and mutual influence, leading to an inability to fully integrate them. To enhance the synergy between active current limitation control and protection, this paper introduces a two-stage active current limiting control coordinated protection scheme for half-bridge MMCs. Firstly, the interdependence between current limitation control and fault identification is established; building on this, to prevent rapid blocking of MMCs post short-circuit faults and the impact of fault characteristic changes on the reliability of fault identification, the first stage of current limitation control is implemented using AC virtual impedance control. This approach limits the arm current without modifying the DC-side fault characteristics, thus creating favorable conditions for existing protection. Secondly, line boundary properties are leveraged to delineate the scope for the second stage of DC-side current limitation control, enabling selective deployment of current limitation measures and curbing the propagation of fault impacts. Finally, by integrating the current limitation areas with directional elements, reliable fault identification is accomplished. Simulation outcomes indicate that the proposed scheme effectively limits both AC and DC currents, providing a novel perspective for the convergence of current limitation control and fault identification.</div><div>© 2017 Elsevier Inc. All rights reserved.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"166 ","pages":"Article 110530"},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A multiple choice relaxation model to solve the AC optimal power flow","authors":"Fatemeh Zadehmohammadi,&nbsp;Hossein Sharifzadeh","doi":"10.1016/j.ijepes.2025.110533","DOIUrl":"10.1016/j.ijepes.2025.110533","url":null,"abstract":"<div><div>Mathematically speaking, AC optimal power flow (OPF), seeking an optimal state of a power system, is an NP-hard nonconvex optimization problem. In the past two decades, many researchers have attempted to accurately solve the AC OPF problem, that is, derive its globally optimal solution, primarily using relaxation methods. This paper presents a mixed-integer relaxation of AC OPF relying on polyhedral envelopes and a multiple choice model. To this end, first, we recast all nonlinear terms in the AC OPF as bilinear and quadratic terms having known linear approximation errors. Then, all these terms are replaced with their polyhedral envelopes. Last, the polyhedral envelopes are represented as a mixed-integer linear relaxation model using the multiple choice modeling technique. We also design an iterative solution method with a bound-tightening technique where one can improve the approximate functions and derive tighter relaxations progressively. The conducted computational experiment shows that the presented method can tightly relax the AC OPF and accurately solve the adopted case studies. The presented comparisons with 43 previous studies show that the proposed method can outperform earlier AC OPF solution techniques in solution optimality in the adopted case studies.</div></div>","PeriodicalId":50326,"journal":{"name":"International Journal of Electrical Power & Energy Systems","volume":"166 ","pages":"Article 110533"},"PeriodicalIF":5.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}