检索结果-内蒙古大学图书馆

IEEE AFRICON Conference - Powering Africa s Sustainable Energy for AD Agenda - The Role ofICT and Engineering.

作者： Manditereza, P. T. Cent Univ Technol Dept Elect Elect & Comp Engn Bloemfontein Free State South Africa

ISBN: (纸本)9781728132891

The integration of distributed energy resources (DERs) has transformed the distribution system from radial to distributed architecture, impacting the operation of inverse time-current graded relays. Despite the evolving structure of the power network, the protection zoning arrangements have not changed and protection strategies reported in recent literature for mitigation of the impact of DER integration maintain the traditional zoning arrangements. This paper presents the application of a voltage-based protection algorithm that operates over a new type of protection zone. The paper investigates the application of the algorithm to a typical power network operating at different voltage levels coupled through transformers. The algorithm requires conversion of a given power network to the per unit equivalent circuit in which the network components are represented by the equivalent resistance and/or reactance. The algorithm operates over this equivalent circuit which does not distinguish between transformer and line elements. The results show that the algorithm can provide effective protection to a network of any topology.

关键词： protection zones protection algorithm fault detection and identification voltage based protection distributed protection

来源：评论

学校读者我要写书评

暂无评论

protection algorithms for Closed-Ring Grids With Distributed Generation

引用

IEEE TRANSACTIONS ON POWER DELIVERY 2022年第5期37卷 4042-4052页

作者： Biller, Martin Jaeger, Johann FAU Univ Erlangen Nuremberg Inst Elect Energy Syst D-91054 Erlangen Germany

This paper proposes an approach to mitigate adverse effects of the fault management of closed/ring grids with high shares of distributed generation (DG). The approach refers to conventional distance protection relays in particular. The rising share of DG, especially in distribution systems, can lead to overloadings and intolerable voltages. Closed-ring structures increase the grid capacity for DG due to more balanced load and voltages profiles. However, malfunctions of protection relays may occur because fault locating and selective fault clearing can be disturbed. This paper presents a distance protection algorithm for feeder relays that complies with the requirements of closed/ring grids with inter/infeeds. The proposed current comparison method (CCM) bases on the comparison of negative/sequence currents. It needs no voltage measurement and remains unaffected from inter/infeeds and fault resistances. Additionally, for relays located at the ring coupler, where the ring can be opened, a coupling relay method (CRM) is proposed. It locates unsymmetrical faults in closed/ring grids with inter/infeeds and enables fast and selective opening of the ring. This helps maintaining reliable power supply for customers in closed rings. Finally, the paper presents a grading strategy reducing the average fault clearing time. Lab tests prove the capability of both proposed algorithms.

关键词： Relays Circuit faults Customer relationship management Voltage measurement Nonhomogeneous media Impedance Couplings Protective relaying protection algorithm current comparison coupling relaying protection relay grading distributed generation closed ring structures

来源：评论

学校读者我要写书评

暂无评论

Guidelines for EMT Transmission Line Models for Time-Domain protection algorithms

Guidelines for EMT Transmission Line Models for Time-Domain ...

引用

IEEE Belgrade PowerTech Conference

作者： Vermunicht, Joachim Leterme, Willem Abedrabbo, Mudar Van Hertem, Dirk Katholieke Univ Leuven Dept Elect Engn Energy Ville Genk Belgium

ISBN: (纸本)9781665487788

New transmission line protection methods have been proposed for improved speed and dependability in future power systems with new elements such as VSC HVDC converters. These new methods either implicitly assume or explicitly use a transmission line model, which may vary from very simple to very detailed. The absence of a verification of these models may impact dependability and result in unwanted behaviour, especially for those algorithms that do not explicitly filter out a specific frequency (e.g., the fundamental). This paper presents a verification step in the frequency domain to assess the line model accuracy within the bandwidth of the algorithm and applies this with examples. Second, to make algorithm design choices explicit, an analysis of the line model-algorithm interactions is provided. The paper finds that the protection input filter should match the bandwidth for which the line model is accurate. A carefully designed input filter thus depends on algorithm design choices and constraints such as line geometry, line model and sample rate.

关键词： HVDC transmission Input filter protection algorithm Time-domain protection Transmission line modelling

来源：评论

学校读者我要写书评

暂无评论

A Positive/Negative Voltage Sequence Droop-Based Differential protection Scheme for Islanded Microgrids With Inverter-Based DG

引用

IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS 2025年第1期21卷 327-336页

作者： Abdelemam, Ahmed M. Zeineldin, Hatem Al-Durra, Ahmed El-Saadany, Ehab F. Khalifa Univ Sci & Technol Adv Power & Energy Ctr Abu Dhabi 127788 U Arab Emirates Helwn Univ Dept Elect Power & Machines Engn Cairo 11795 Egypt Cairo Univ Elect Power Engn Dept Giza 12613 Egypt Univ Waterloo Waterloo ON N2L 3G1 Canada

Inverter-interfaced distributed generators (IIDGs) embedded in microgrids inject limited fault currents, thus imposing a challenge on the protection of the islanded microgrid. This article proposes a novel protection scheme that injects a negative phase sequence (NPS) current component from the IIDG interface control during fault conditions to facilitate fault detection and isolation. This injection is accomplished by augmenting the traditional droop controller of IIDG with a novel positive phase sequence (PPS) voltage versus NPS voltage ($V_{\text{PPS}}-V_{\text{NPS}}$) droop, designed to inject negative sequence current during fault conditions only. Differential NPS current relays are distributed at the line ends to provide fault detection and isolation. The effectiveness of the suggested protection algorithm has been tested and validated using PSCAD/EMTDC simulation software, which considers various fault conditions, such as different fault types, locations, and resistance. The suggested droop-based protection algorithm eradicates the need for a dedicated fault detection scheme and can accurately distinguish faulty and nonfaulty conditions.

关键词： protection Relays Fault detection Harmonic analysis Voltage control Circuit faults Resistance Differential relay droop control inverter-interfaced distributed generator (IIDG) negative phase sequence (NPS) protection algorithm

来源：评论

学校读者我要写书评

暂无评论

Inverter Based Islanded Microgrid protection Using Discrete Wavelet Transform

Inverter Based Islanded Microgrid Protection Using Discrete ...

引用

IEEE Conference on Power Electronics and Renewable Energy (IEEE CPERE)

作者： Abdelemam, Ahmed M. Zeineldin, Hatem. H. Al-Durra, Ahmed El Moursi, Mohamed Shawky El-Saadany, Ehab F. Khalifa Univ Adv Power & Energy Ctr EECS Dept Abu Dhabi U Arab Emirates

ISBN: (纸本)9781665452335

One of the main drawbacks of the Inverter Interfaced Distributed Generator (IIDG) is that the protection of the inverter switch limits the fault current through the inverter control system to be almost equal to the rated current. As a result, traditional overcurrent relays cannot operate to protect the distribution lines in islanded microgrid connected with IIDG during different types of short circuits. In this paper, a new protection scheme is proposed by utilizing the Discrete Wavelet Transform (DWT) to detect faults by extracting high-frequency current oscillations associated with short-circuit currents. The discrete wavelet energy is calculated from the DWT output, accumulated, and compared to the threshold value. The main advantages of this protection algorithm are that it does not need to depend on the short-circuit current increased values to detect the fault and communication is not required between relays. The proposed protection scheme is verified by using PSCAD / EMTDC simulation program. The results validate the proposed IIDG protection strategy by considering different fault types and locations.

关键词： Inver Interfaced Distributed Generator (IIDG) Short circuit Discrete Wavelet Transform (DWT) protection algorithm

来源：评论

学校读者我要写书评

暂无评论

Integrated busbar protection scheme utilizing a numerical technique based on coherence method

引用

JOURNAL OF ENGINEERING-JOE 2022年第1期2022卷 94-119页

作者： Mahmoud, R. A. Mist Univ Sci Technol MUST Coll Engn Sci & Technol Dept Elect Power & Machines Engn PME Giza Egypt

A Busbar (BB) is one of the most important elements of a power system, which links a variety of elements such as generators, power transformers, transmission lines and loads. The BB fault current magnitude is very large, which has to be immediately cleared in order to minimize the failure in the power system, and to avoid the CT saturation effects. This paper presents a novel BB protection scheme based on closed-tripping characteristics of coherence coefficients computed for BB current signals. Three-phase current signals of each circuit connected to the protected busbar are measured for calculating nine cross-coherence coefficients. These coefficients are compared with each other and with a pre-determined threshold value to identify the fault location, classification and direction discrimination, as well as to differentiate the internal and external faults with CT saturation extent. The scheme is tested under different types of external and internal faults with variations of faulty phase(s), fault locations, fault resistances, fault inception angles, and power flow angles. ATP platform is used for power system simulation, and MATLAB software is applied to validate the proposed protection algorithm. The simulation results prove that the scheme is fast, where its operating time is within a sub-cycle time range, and it has the ability to discriminate between internal and external faults with/without CT saturation condition. Moreover, the numerical technique is immune to CT saturation effect, and it is simple, effective, secure, reliable, stable and feasible.

关键词： fault inception angles BB current signals CT saturation condition external faults numerical technique saturation effect power transformers power system simulation classification fault currents cross-coherence coefficients power flow angles fault location protected busbar CT saturation effects closed-tripping characteristics faulty phase direction discrimination fault resistances coherence method fault diagnosis novel BB protection scheme three-phase current signals busbars BB fault current magnitude transmission lines protection algorithm power transmission faults CT saturation extent pre-determined threshold value internal faults power transmission lines current transformers relay protection integrated busbar protection scheme power transmission protection

来源：评论

学校读者我要写书评

暂无评论

Reliability Analyses of Wide-Area protection System Considering Cyber-Physical System Constraints

引用

IEEE TRANSACTIONS ON SMART GRID 2021年第4期12卷 3458-3467页

作者： He, Ruiwen Yang, Shenghui Deng, Jianhua Feng, Teng Lai, Loi Lei Shahidehpour, Mohammad Guangdong Univ Technol Dept Elect Engn Sch Automat Guangzhou 510006 Peoples R China Foshan Elect Power Co Ltd China Southern Power Grid Foshan 528000 Peoples R China State Grid Econ & Technol Res Inst Co Ltd Automat & Control Design Res Ctr Beijing 102209 Peoples R China IIT Dept Elect & Comp Engn Chicago IL 60616 USA King Abdulaziz Univ ECE Dept Jeddah 21589 Saudi Arabia

Wide-area measurement, protection and control systems link the cyber power system with the physical power system to realize a cyber-physical power system (CPPS). This paper proposes a reliability modeling and assessment method for the wide-area protection system (WAPS). The proposed WAPS model takes into account the decision accuracy of protection algorithms with limited available data at the control center, and combines it with the tripping reliability of protection devices in corresponding substations to form the operation accuracy of WAPS. In particular, the directional comparison algorithm used in decision-making is functionally divided into three modules, namely the initiation module, the fault area positioning module, and the faulted element recognition module. The proposed reliability models are established based on the Permutation and Combination method under the assumption that the data acceptance rate of the control center is d. The sequential Monte-Carlo simulation is used to solve the proposed reliability indices. Finally, the WAPS reliability assessment is presented for the IEEE 14-bus system and the key influencing factors are identified and discussed.

关键词： Cyber-physical power system (CPPS) data flow protection algorithm reliability analysis wide-area protection system (WAPS)

来源：评论

学校读者我要写书评

暂无评论

A comparison of non-unit and unit protection algorithms for HVDC grids

A comparison of non-unit and unit protection algorithms for ...

引用

AEIT HVDC International Conference (AEIT HVDC) - Operational Experience and Technological Development for Application Worldwide

作者： Perez-Molina, Maria Jose Marene Larruskain, Dunixe Eguia Lopez, Pablo Abarrategi, Oihane Santos-Mugica, Maider Univ Basque Country UPV EHU Dept Elect Engn Bilbao Spain Tecnalia Res & Innovat Div Energy & Environm Derio Spain

ISBN: (纸本)9781728120713

From a prospect where High Voltage Direct Current systems are the most promising alternative for new grid expansion as well as for integration of renewable energies at worldwide level, this paper analyses DC protection systems and their challenges on detecting and clearing faults. The focus of this paper is a comparison between non-unit and unit protection systems. It is also presented a study case with a simple non-unit algorithm, which is enhanced with a communication system.

关键词： HVDC communication DC faults fault detection fault protection protection algorithm

来源：评论

学校读者我要写书评

暂无评论

Development and functional testing of battery management system algorithm for an electric bicycle using hardware in the loop testbench

引用

ENGINEERING RESEARCH EXPRESS 2024年第3期6卷 035357-035357页

作者： Siddharth, M. Rammohan, A. Vellore Inst Technol Sch Elect Engn Vellore 632014 India Vellore Inst Technol Automot Res Ctr Vellore 632014 India

An embedded Battery Management System (BMS) ensures the effective functionality and longevity of the vehicle battery systems. Testing the BMS using the Hardware in Loop (HIL) approach effectively increases safety and reduces product development time in the manufacturing sector. This research aims to develop an efficient battery management system with two-level protection for electric bicycles and test its functionality in the HIL configuration. The bicycle traction model and battery management system were first developed using a model-based design. Further, the model is tested and validated using battery emulators in the HIL methodology. The battery management system receives input data, such as current, voltage, and temperature, and monitors these parameters. The first level of protection involves the vehicle user receiving the warning when the monitoring parameters values exceed the given first safety threshold. As per the second safety threshold values, the BMS trips off the charging or discharging process when the voltage is 51V, the charge current is 5A, the discharge current is -5A and the IC temperature is 80 degrees. Also, BMS balances the cells in 3.84 min using passive balancing. Additionally, the BMS delivers a controlled current of 2.5A for safe battery charging. This methodology increases safety by reducing the potential risks of testing the BMS algorithms in the actual electric bicycle.

关键词： hardware in Loop (HIL) battery management system (BMS) testing and validation electric bicycle vehicle traction emulators protection algorithm

来源：评论

学校读者我要写书评

暂无评论

Performance Evaluation of Power Differential and Sensitivity Based protection for Active Distribution Systems

引用

ELECTRIC POWER COMPONENTS AND SYSTEMS 2020年第12-13期48卷 1378-1389页

作者： Manditereza, Patrick T. Bansal, Ramesh C. Cent Univ Technol Dept Elect Elect & Comp Engn Bloemfontein Free State South Africa Univ Sharjah Dept Elect Engn Sharjah U Arab Emirates

protection performance is characterized by qualities that include selectivity, speed, sensitivity and stability. Generally, selectivity and speed present conflicting requirements on the protection design, as do sensitivity and stability requirements. The integration of distributed generation (DG), in particular at the distribution level, further compromises satisfactory achievement of these performance qualities. A recent paper by the authors introduced a protection algorithm based on active power differential and sensitivity analysis (APdSA) for the protection of active distribution systems and microgrids. This paper investigates the performance characteristics of this algorithm with respect to selectivity, sensitivity, stability, and speed. It is shown that, with an important modification to the protection zoning arrangement, the APdSA algorithm is able to selectively clear faults in a DG-integrated distribution system with high sensitivity, stability, and speed, with more than 95% reach over a wide range of fault resistances. The algorithm is also tolerant to communication failure.

关键词： protection algorithm voltage based protection wide area protection distribution system protection microgrid protection fault detection algorithms impact of distributed generation protection performance characteristics sensitivity analysis power differential based protection

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：