IEEE Transactions on Power Delivery最新文献

英文中文

Investigation of Discharge and Audible Noise Behavior of OHLs for Separated AC Half-Waves 对分离式交流半波 OHL 放电和可听噪声行为的研究

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery

Pub Date : 2024-11-07 DOI: 10.1109/TPWRD.2024.3494240

Hannah Kirchner;Grischa Ruprecht;Benjamin Schröder;Saskia Möllenbeck;Christian M. Franck

The transition to renewable energy sources requires upgrades and expansion of the existing power transmission grid, which consists mostly of overhead power lines. Audible noise emission during foul weather poses challenges to these activities with respect to legal requirements and public acceptance. It is therefore necessary to investigate how the audible noise is generated and why some conductors have higher noise emission than others. Many studies have already been carried out under AC and DC stress. However, when analyzing AC voltages, the audible noise components of the individual half-waves of the conductor cannot be separated from each other. For this reason, this work examines the half-waves separately in order to gain a better understanding of the discharge behavior and the resulting audible noise emission for new and aged conductors. The broadband and tonal noise component as well as the number, amplitude of discharges and total charge are analyzed. The results show that intensity of the discharges have a greater influence on the audible noise emission when comparing both half-waves separately, but the number of discharges and therefore the number of droplets on the conductor has the greatest impact on the broadband and the tonal component of the total audible noise emission. The reason for that is that the emission of the positive half-wave has a greater influence on the total audible noise emission than the negative one.

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引用次数: 0

Optimal Requirements of Spare Transformers and Mobile Units for Distribution Substations via Genetic Algorithm and Monte Carlo Techniques 通过遗传算法和蒙特卡洛技术优化配电变电站备用变压器和移动装置的要求

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery

Pub Date : 2024-11-06 DOI: 10.1109/TPWRD.2024.3492809

Vênus Líria Silva Mendes;Armando Martins Leite da Silva;João Guilherme de Carvalho Costa;Gomaa A. Hamoud

This paper proposes a new optimization method based on enhanced genetic algorithm (GA) and Monte Carlo simulation (MCS) techniques, which are simultaneously applied to size regular spare transformer (RST) and mobile unit substations (MUS) stocks for distribution substations. The aim is to serve a group of electrical energy distribution substations to mitigate possible losses caused by load curtailments due to major failures that affect the substation transformers. The proposed method includes the use of resources such as MUS and load transfer, in addition to representing the expansion of the transformers group in operation and the increase in power demand, over a specified planning horizon, considering all waiting times inherent to system actions, e.g.,: RST installation, MUS connection, stock replenishment, etc. Two real systems with different characteristics are used to illustrate the proposed method, allowing the analysis of results obtained from different scenarios and parameters.

引用次数: 0

An Adaptive Special Protection Scheme Coordinating Multiple Generation Units for Damping Power System Natural Oscillations 一种协调多个发电机组的自适应特殊保护方案，用于抑制电力系统的自然振荡

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery

Pub Date : 2024-11-06 DOI: 10.1109/TPWRD.2024.3489026

Tor Inge Reigstad;Salvatore D'Arco;Santiago Sanchez-Acevedo

This paper presents a special protection scheme (SPS) that mitigates natural oscillations in the power system by enabling selected adaptive power oscillation damping (APOD) controllers in wind farms or synchronous generators. The SPS activation is triggered by an online power oscillation detection algorithm. Furthermore, to tackle the intricacies of time delays within the control system, an adaptive time delay compensator (ATDC) has been integrated into the SPS control scheme. The SPS is tested on the New England 39 bus system by numerical simulations and in the Nordic 44 system by experimental testing with a hardware-in-the-loop approach. The numerical results show that the proposed SPS can increase the damping of low-frequency natural oscillations (LFOs) significantly and even avoid unstable situations with growing oscillations. Moreover, the laboratory validation demonstrates that the system is able to run in real-time and that the time delays caused by PMU measurements, communication, and computation can be handled correctly. Thus, the proposed SPS concept can possibly be implemented to serve as an additional and automatic tool for the system operators to damp natural power oscillations by coordinated control of multiple sources.

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引用次数: 0

A Composite Insulator Overheating Defect Detection System Based on Infrared Image Object Detection 基于红外图像目标检测的复合绝缘体过热缺陷检测系统

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery

Pub Date : 2024-11-05 DOI: 10.1109/TPWRD.2024.3488061

Changwu Li;Ying Shi;Ming Lu;Shenpei Zhou;Changjun Xie;Yue Chen

Composite insulators are important components of power transmission lines and their quantity is huge, and their overheating defects can cause serious power accidents, so it is crucial to detect the overheating defects of composite insulators on a regular basis. Current detection methods suffer problems such as low detection accuracy and efficiency. To solve these problems, we propose a method for detecting overheating defects of composite insulators based on infrared images and computer vision. The system is divided into two parts: composite insulator detection and key point extraction. During the experiment, we found that there are problems of sample imbalance and inaccurate positioning of prediction box, so we proposed Equalized Fully Convolutional One-Stage object detection (FCOS), which adds the sample equalization strategy and multi-dimensional dynamic attention mechanism on the basis of FCOS, and improves the Centerness and proposes the center positioning confidence. The results show that the performance of Equalized FCOS is significantly improved compared with FCOS, with mAP, AP50, AP75, APm, and APl improved by 7.6%, 5.1%, 12.1%, 4.6%, and 9.7% respectively. Finally, considering the practical application requirements, we extracted the key points of the mandrels and performed temperature analysis. We have realized the automated inspection of composite insulators.

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引用次数: 0

Data-Driven Topology and Parameter Identification in Distribution Systems With Limited Measurements 利用有限的测量数据在配电系统中进行数据驱动的拓扑和参数识别

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery

Pub Date : 2024-11-05 DOI: 10.1109/TPWRD.2024.3491912

Steven de Jongh;Felicitas Mueller;Fabian Osterberg;Claudio A. Cañizares;Thomas Leibfried;Kankar Bhattacharya

This manuscript presents novel techniques for identifying the switch states, phase identification, and estimation of equipment parameters in multi-phase low voltage electrical grids, which is a major challenge in long-standing German low voltage grids that lack observability and are heavily impacted by modelling errors. The proposed methods are tailored for systems with a limited number of spatially distributed measuring devices, which measure voltage magnitudes at specific nodes and some line current magnitudes. The overall approach employs a problem decomposition strategy to divide the problem into smaller subproblems, which are addressed independently. The techniques for identifying switch states and system phases are based on heuristics and a binary optimization problem using correlation analysis of the measured time series. The estimation of equipment parameters is achieved through a data-driven regression approach and by an optimization problem, and the identification of cable types is solved using a Mixed-Integer Quadratic Programming solver. To validate the presented methods, a realistic grid is used and the presented techniques are evaluated for their resilience to data quality and time resolution, discussing the limitations of the proposed methods.

{"title":"Data-Driven Topology and Parameter Identification in Distribution Systems With Limited Measurements","authors":"Steven de Jongh;Felicitas Mueller;Fabian Osterberg;Claudio A. Cañizares;Thomas Leibfried;Kankar Bhattacharya","doi":"10.1109/TPWRD.2024.3491912","DOIUrl":"10.1109/TPWRD.2024.3491912","url":null,"abstract":"This manuscript presents novel techniques for identifying the switch states, phase identification, and estimation of equipment parameters in multi-phase low voltage electrical grids, which is a major challenge in long-standing German low voltage grids that lack observability and are heavily impacted by modelling errors. The proposed methods are tailored for systems with a limited number of spatially distributed measuring devices, which measure voltage magnitudes at specific nodes and some line current magnitudes. The overall approach employs a problem decomposition strategy to divide the problem into smaller subproblems, which are addressed independently. The techniques for identifying switch states and system phases are based on heuristics and a binary optimization problem using correlation analysis of the measured time series. The estimation of equipment parameters is achieved through a data-driven regression approach and by an optimization problem, and the identification of cable types is solved using a Mixed-Integer Quadratic Programming solver. To validate the presented methods, a realistic grid is used and the presented techniques are evaluated for their resilience to data quality and time resolution, discussing the limitations of the proposed methods.","PeriodicalId":13498,"journal":{"name":"IEEE Transactions on Power Delivery","volume":"40 1","pages":"249-260"},"PeriodicalIF":3.8,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142588895","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}

引用次数: 0

Optimal Placement and Sizing of Fault Current Limiters: A Voltage- Stability-Constrained Approach Considering Transmission Switching 故障限流器的优化布置和选型：考虑输电切换的电压稳定性约束方法

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery

Pub Date : 2024-11-04 DOI: 10.1109/TPWRD.2024.3486096

Jingbo Zhao;Haocheng Hua;Chuan He;Lu Nan

As power system network structures expand and integrate advanced system devices, the ever-increasing short-circuit current (SCC) hinders further development. Fault current limiters (FCLs) and transmission switching (TS) are widely- recognized measures to counteract SCC. However, TS can adversely impact system voltage stability, a factor commonly overlooked in SCC research. Additionally, a combined framework that incorporates both FCL investment and TS remains elusive. This paper proposes a novel voltage-stability-constrained planning framework to ascertain the optimal placement and sizing of FCLs while also considering economy and SCC limiting effects of TS. Formulations for both FCL investment and transmission switching effects on SCC magnitude are presented. Based on these formulations, the proposed planning model is cast as a mixed-integer linear programming (MILP) problem. To ensure a voltage-stable and economically feasible solution, the model integrates voltage stability requirements to prevent potential voltage collapse after switching lines. The effectiveness of the proposed model is evaluated using the IEEE 30-bus and 118-bus systems, demonstrating both its economic benefits and voltage stability guarantees.

{"title":"Optimal Placement and Sizing of Fault Current Limiters: A Voltage- Stability-Constrained Approach Considering Transmission Switching","authors":"Jingbo Zhao;Haocheng Hua;Chuan He;Lu Nan","doi":"10.1109/TPWRD.2024.3486096","DOIUrl":"10.1109/TPWRD.2024.3486096","url":null,"abstract":"As power system network structures expand and integrate advanced system devices, the ever-increasing short-circuit current (SCC) hinders further development. Fault current limiters (FCLs) and transmission switching (TS) are widely- recognized measures to counteract SCC. However, TS can adversely impact system voltage stability, a factor commonly overlooked in SCC research. Additionally, a combined framework that incorporates both FCL investment and TS remains elusive. This paper proposes a novel voltage-stability-constrained planning framework to ascertain the optimal placement and sizing of FCLs while also considering economy and SCC limiting effects of TS. Formulations for both FCL investment and transmission switching effects on SCC magnitude are presented. Based on these formulations, the proposed planning model is cast as a mixed-integer linear programming (MILP) problem. To ensure a voltage-stable and economically feasible solution, the model integrates voltage stability requirements to prevent potential voltage collapse after switching lines. The effectiveness of the proposed model is evaluated using the IEEE 30-bus and 118-bus systems, demonstrating both its economic benefits and voltage stability guarantees.","PeriodicalId":13498,"journal":{"name":"IEEE Transactions on Power Delivery","volume":"40 1","pages":"88-99"},"PeriodicalIF":3.8,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142580030","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}

引用次数: 0

Fault Property Identification and Fault Recovery Scheme for Flexible DC Lines Based on Voltage Injection 基于电压注入的柔性直流线路故障特性识别和故障恢复方案

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery

Pub Date : 2024-11-04 DOI: 10.1109/TPWRD.2024.3491187

Ruizhi Ma;Yu Chen;Minghao Wen;Ke Han

In overhead line MMC-HVDC systems, hybrid modular multilevel converters (MMC) can limit fault currents by reducing the voltage during DC faults. For successful system recovery after fault isolation, it is critical to accurately identify the fault characteristics. However, blindly restarting the system risks causing further damage within a short time frame, compromising overall system safety. To address these concerns, this paper proposes a fault identification and system restoration scheme tailored for hybrid MMC-HVDC transmission systems. The proposed approach enhances the control of hybrid MMC injection signals, ensuring fault identification while minimizing the risk of damage to converter valves. A thorough analysis of system responses under various fault conditions is conducted. Additionally, a criterion is established using the Euclidean distance between the voltage reference value and voltage measured value to distinguish fault property. Strategies for voltage restoration and power recovery in the event of temporary faults are also presented, significantly reducing recovery time. The effectiveness of the proposed scheme is validated through simulation results under various fault conditions.

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引用次数: 0

Accurate and Continuous Reactive Power Control of Three-Terminal Hybrid DC Transmission System 三端混合直流输电系统的精确和连续无功功率控制

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery

Pub Date : 2024-11-04 DOI: 10.1109/TPWRD.2024.3480270

Shunliang Wang;Qinger Cheng;Boyang Shangguan;Junpeng Ma;Ning Jiao;Tianqi Liu

Hybrid high voltage direct current transmission (HVDC) can avoid commutation failure of line commutated converter based HVDC (LCC-HVDC) and high costs from modular multilevel converter based HVDC (MMC-HVDC). The uncontrollability of reactive power from LCC results in the control performance of hybrid HVDC that is not comparable to MMC-HVDC. To address this shortcoming, a mathematical model with all AC and DC side characteristics of a three-terminal hybrid HVDC system is established. Then, the quantitative relationship between the reactive power, AC bus voltage, and control variables of three converter stations is revealed. Through this analysis, a coordinated control strategy that can achieve continuous and precise control of reactive power and AC bus voltage is proposed. This strategy is achieved by utilizing the self-regulating capabilities of the converter stations. Besides, the DC voltage is ensured to remain within a reasonable range through the coordinated operation of capacitor banks. Moreover, error feedback and gamma-kick are added to make the control objective more accurate. Finally, the simulation results indicate that the proposed reactive power coordination control strategy demonstrates ideal control performance.

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引用次数: 0

Change in Lower Lip Position After Le Fort I Advancement in Patients with Bilateral vs. Unilateral Cleft Lip and Palate. 双侧唇腭裂患者与单侧唇腭裂患者进行 Le Fort I 前移术后下唇位置的变化。

IF 1.2 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery

Pub Date : 2024-11-01 Epub Date: 2023-06-25 DOI: 10.1177/10556656231184975

Jill Schechter, Andre Alcon, Alexandra Verzella, Pradip Shetye, Roberto Flores

To compare lower lip changes after Le Fort I advancement surgery in patients with a cleft.

Single institution, retrospective review.

Academic tertiary referral hospital.

Skeletally mature patients with a cleft who underwent one-piece Le Fort I advancement surgery who had a lateral cephalogram or cone-beam computed tomography (CBCT) scan preoperatively and at least 6 months postoperatively. Patients who underwent concomitant mandibular surgery or genioplasty were excluded. 64 patients were included: 45 male and 19 female, 25 with BCLP and 39 with UCLP. The mean age at surgery was 18.4 years.

Single jaw one-piece Le Fort I advancement surgery.

Standard lateral cephalometric landmarks of the bony skeleton and soft tissue were compared before and after Le Fort I advancement. Pearson correlation coefficients (r) were calculated to measure the correlation between lower lip position and other soft and hard tissue changes.

After comparable maxillary advancements [BCLP: 7.2 mm (95% CI: 6.2-8.3 mm), UCLP: 6.4 mm (95% CI: 5.7-7.0 mm)] the horizontal upper-to-lower lip discrepancy significantly improved in both groups. The lower lip became thinner and more posteriorly positioned. Changes in lower lip position correlated strongly with mandibular bony landmarks and moderately with upper lip position, but poorly with maxillary landmarks.

Le Fort I advancement results in posterior displacement of the lower lip and better lip competence, thereby improving facial harmony. This lower lip change is not predictable by degree of maxillary advancement, and does not differ in patients with BCLP vs. UCLP.

学术性三级转诊医院.骨骼发育成熟的唇裂患者，接受一体式 Le Fort I 推进手术，术前和术后至少 6 个月接受侧位头颅影像或锥束计算机断层扫描（CBCT）。排除了同时接受下颌骨手术或基因成形术的患者。共纳入 64 名患者：其中男性 45 人，女性 19 人；25 人患有 BCLP，39 人患有 UCLP。手术时的平均年龄为 18.4 岁。单颌一体式 Le Fort I 前移手术前后，骨性骨骼和软组织的标准头侧测量地标进行了比较。计算了皮尔逊相关系数（r），以衡量下唇位置与其他软硬组织变化之间的相关性。在进行了可比的上颌前突手术后[BCLP：7.2 mm (95% CI：6.2-8.3 mm)，UCLP：6.4 mm (95% CI：5.7-7.0 mm)]，两组患者的上下唇水平差异都得到了显著改善。下唇变得更薄，位置更靠后。下唇位置的变化与下颌骨地标的相关性很强，与上唇位置的相关性一般，但与上颌骨地标的相关性较差。下唇的这种变化无法通过上颌前突的程度来预测，而且在 BCLP 与 UCLP 患者中也没有差异。

{"title":"Change in Lower Lip Position After Le Fort I Advancement in Patients with Bilateral vs. Unilateral Cleft Lip and Palate.","authors":"Jill Schechter, Andre Alcon, Alexandra Verzella, Pradip Shetye, Roberto Flores","doi":"10.1177/10556656231184975","DOIUrl":"10.1177/10556656231184975","url":null,"abstract":"To compare lower lip changes after Le Fort I advancement surgery in patients with a cleft.Single institution, retrospective review.Academic tertiary referral hospital.Skeletally mature patients with a cleft who underwent one-piece Le Fort I advancement surgery who had a lateral cephalogram or cone-beam computed tomography (CBCT) scan preoperatively and at least 6 months postoperatively. Patients who underwent concomitant mandibular surgery or genioplasty were excluded. 64 patients were included: 45 male and 19 female, 25 with BCLP and 39 with UCLP. The mean age at surgery was 18.4 years.Single jaw one-piece Le Fort I advancement surgery.Standard lateral cephalometric landmarks of the bony skeleton and soft tissue were compared before and after Le Fort I advancement. Pearson correlation coefficients (r) were calculated to measure the correlation between lower lip position and other soft and hard tissue changes.After comparable maxillary advancements [BCLP: 7.2 mm (95% CI: 6.2-8.3 mm), UCLP: 6.4 mm (95% CI: 5.7-7.0 mm)] the horizontal upper-to-lower lip discrepancy significantly improved in both groups. The lower lip became thinner and more posteriorly positioned. Changes in lower lip position correlated strongly with mandibular bony landmarks and moderately with upper lip position, but poorly with maxillary landmarks.Le Fort I advancement results in posterior displacement of the lower lip and better lip competence, thereby improving facial harmony. This lower lip change is not predictable by degree of maxillary advancement, and does not differ in patients with BCLP vs. UCLP.","PeriodicalId":13498,"journal":{"name":"IEEE Transactions on Power Delivery","volume":"19 1","pages":"1836-1844"},"PeriodicalIF":1.2,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84590411","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}

引用次数: 0

A Novel Time-Delay Filter Implementation for Resilient Control of Active Power Filters 用于有源电力滤波器弹性控制的新型延时滤波器实现方法

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery

Pub Date : 2024-10-29 DOI: 10.1109/TPWRD.2024.3488005

Abdullahi Bamigbade;Francisco de León

The increasing penetration of power electronics-based devices has led to reduced power quality in power grids, making effective solutions like active power filters (APFs) essential. To tackle this problem, this article proposes a novel time-delay filter aimed at improving the accuracy of reference current generation (RCG) and enhancing the overall compensation performance of APFs. The proposed filter is implemented as a dual cascaded second-order time-delay (DCSOTD) filter and exhibits exceptional harmonic rejection capabilities and stability properties. It inherently rejects the negative sequence component of an unbalanced and distorted load current, along with the

$5^{th}$

negative and

$7^{th}$

positive sequence harmonics. More so, the proposed DCSOTD filter offers two additional design degrees of freedom, enabling the selective rejection of any two harmonic components of the load current and their odd integer multiples. Its delay-independent stability feature makes it well-suited for APF applications that involve a wide range of frequency variations. Comparative performance analysis with DSOGI and DROGI-based RCGs underscores the superior performance of the proposed DCSOTD filter in enhancing power quality, particularly under unbalanced voltage and load conditions. Additionally, its stability is demonstrated in a more electric aircraft grid during a significant frequency variation from 400 Hz to 800 Hz.

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引用次数: 0

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