检索结果-南通市图书馆

protection and Control of Modern Power Systems 2024年第4期9卷 23-38页

作者： Praveen Kumar Gupta Priyanshul Niranjan Niraj Kumar Choudhary Nitin Singh Ravindra Kumar Singh the Department of Electrical Engineering Motilal Nehru National Institute of Technology AllahabadPrayagraj 211004India

Relay coordination is crucial in electrical power systems to protect against malfunctions and damage caused by unexpected events like short circuits.To address the challenge associated with the reverse direction of fault current,dual-setting(DS)directional over-current relays have evolved but failed to provide proper coordination during changes of load,generation,and network.In the meantime,with the increasing number of DS relays,the total relay operating time tends to saturate.Therefore,this paper proposes a protection scheme based on the optimal deployment of conventional and dual-setting rate of change of voltage(DS-ROCOV)relays in distribution systems.This holds true for varying network topologies and is unaffected by variations in load and generation.The objective of the proposed scheme is to ensure reliable and efficient protection against faults in distribution systems by minimizing the overall operating time with the optimal number of DS-ROCOV relays.The proposed protection scheme’s performance is evaluated for different coordination time interval values as well as in different microgrid scenarios.This paper outlines the design and implementation of the proposed protection scheme which is validated on the modified IEEE 14-bus system using simulations in Matlab/Simulink.

关键词： coordination time interval DS-ROCOV relay multi-objective optimization optimal-deployment protection coordination

Research on the protection coordination of permanent magnet synchronous generator based wind farms with low voltage ride through capability

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

protection and Control of Modern Power Systems 2017年第1期2卷 311-319页

作者： Renfeng Tao Fengting Li Weiwei Chen Yanfang Fan Chenguang Liang Yang Li College of Electrical Engineering of Xinjiang University XinjiangChina

To coordinate the protection of PMSG(permanent magnet synchronous generator),collector circuits and outgoing lines,a comprehensive and improved protection method of PMSG based wind farms with LVRT(low voltage ride through)capability is proposed.The proposed method includes adding a short time delay to the collector network current protection zone I and a directional protective relaying to the collector network protection,installing grounding transformers and zero sequence current protection,and generator low-voltage protection action improvement.A LVRT scheme consisting of variable resistance dumping circuit,grid side dynamic reactive power control and reactive power compensation control is proposed.The fault characteristics of PMSG based wind farms are analyzed,and a PMSG based wind farm in Dabancheng,Xinjiang,is used as an example to analyze typical wind farm protection configuration,the setting values considering LVRT requirements,and the coordination problems.Finally,an improved wind farm protection coordination methodology is proposed and its validity is verified by simulation.

关键词： LVRT protection coordination PMSG Wind Farm Fault Characteristics

coordination of dual setting overcurrent relays in microgrid with optimally determined relay characteristics for dual operating modes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

protection and Control of Modern Power Systems 2022年第1期7卷 64-81页

作者： Raghvendra Tiwari Ravindra Kumar Singh Niraj Kumar Choudhary Electrical Engineering Department MNNITAllahabadPayagrajUPIndia

Fault current magnitude in a microgrid depends upon its mode of operation,namely,grid-connected mode or islanded mode.Depending on the type of fault in a given mode,separate protection schemes are generally employed.With the change in microgrid operating mode,the protection scheme needs to be modified which is uneconomical and time inefficient.In this paper,a novel optimal protection coordination scheme is proposed,one which enables a common optimal relay setting which is valid in both operating modes of the microgrid.In this con-text,a common optimal protection scheme is introduced for dual setting directional overcurrent relays(DOCRs)using a combination of various standard relay characteristics.Along with the two variables,i.e.,time multiplier setting(TMS)and plug setting(PS)for conventional directional overcurrent relay,dual setting DOCRs are augmented with a third variable of relay characteristics identifier(RCI),which is responsible for selecting optimal relay characteristics from the standard relay characteristics according to the IEC-60255 standard.The relay coordination problem is formulated as a mixed-integer nonlinear programming(MINLP)problem,and the settings of relays are optimally determined using the genetic algorithm(GA)and the grey wolf optimization(GWO)algorithm.To validate the superiority of the pro-posed protection scheme,the distribution parts of the IEEE-14 and IEEE-30 bus benchmark systems are considered.

关键词： Plug setting Time multiplier setting protection coordination Overcurrent relay coordination time interval

Optimized protection Strategies for HVDC Grid with Fault-blocking Modular Multilevel Converters for Overhead Line Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2020年第6期8卷 1168-1177页

作者： Sheng Yan Zhiyuan He Jie Yang Ming Kong Minqiang Hu Southeast University NanjingChina Global Energy Interconnection Research Institute BeijingChina

The high-voltage direct current(HVDC)grid has been recognized as an effective solution for renewable energy integration.Currently,two main development trends for HVDC grids are being studied:a DC breaker based HVDC grid and fault-blocking converter based HVDC grid.Although the former has a perfect performance for fault clearance,its development is still highly constrained by the cost and maturity of DC breakers.The latter can extinguish DC faults by the fault-blocking converters.Without using DC breakers,there is no bottleneck in its technical feasibility.Nevertheless,in fault scenarios,such types of HVDC grids will be blocked at length for air-deionization,which is its main drawback.The aim of this paper is to minimize its power interruption time,by optimizing protection coordination strategies.To cover the most complex cases,the overhead line applications,in which the reclosure actions are required to be implemented,are considered.In this paper,the protection requirements of HVDC grids are first discussed,then the benefits of fault-blocking modular multilevel converters(MMCs)and their fault features are analyzed.Based on this,a control function is designed to reduce the air-deionization time.To minimize the influence of the DC faults,a separation methodology for restarting the system is proposed.The effectiveness of the proposed protection coordination schemes is validated by PSCAD/EMTDC simulations.

关键词： Modular multilevel converter(MMC) high-voltage direct current(HVDC) overhead line fault-blocking converter protection coordination

Adaptability of the Recloser-Fuse protection Scheme in the Presence of Distributed Generation

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2020年第2期14卷 39-52页

作者： Patrícia Santos e Abreu António Gomes Martins INESC Coimbra Department of Electrical and Computer EngineeringRua Sílvio LimaPolo IICoimbra 3030-290Portugal

This paper addresses the behaviour of an IEEE(Institute of Electrical and Electronics Engineers)test network when distributed injections are added to the distribution network.The penetration of different dispersed generation technologies,modifies the distribution system characteristics,with impact on a number of parameters,depending on their size and location on the network.For this purpose,this paper comprises three case studies:in the first case an exhaustive analysis is carried out of the occurrence of faults throughout the network,along with the introduction of distributed generators;in the second case the network behavior is assessed against the use of three of the most commonly used types of generators based on rotating machines;in the third case study an evaluation is made of the network performance when the three types of DG(distributed generation)units are distributed in multiple buses.In all cases the protection system is analyzed with the aim of ensuring coordination among the protection devices.All simulations are performed using the Power Factory software package from DigSILENT.From the simulation results,conclusions are drawn that provide insights into the behaviour of protection systems,highlighting the limitations of the original protections and coordination with different distributed generators technologies.

关键词： DG protection coordination DG technologies power system protection