共查询到15条相似文献,搜索用时 171 毫秒
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基于故障电压比较的广域后备保护新算法 总被引:4,自引:0,他引:4
提出了一种基于故障电压比较的广域后备保护新算法,有助于解决传统后备保护整定配合复杂,潮流转移时易误动等问题。该算法利用线路一侧电压、电流故障分量的测量值推算另一侧电压故障分量,以推算值与测量值的比值识别故障元件。并通过故障区域检测降低广域信息传输量,加快故障元件识别速度。该算法原理简洁,对保护范围内多点量测数据的同步性要求较低。基于川渝500kV电网测试系统的仿真结果表明,该算法在电网高阻接地、非全相运行、故障转换及重负荷转移等情况下均具有良好的动作性能。 相似文献
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基于序电流相位比较和幅值比较的广域后备保护方法 总被引:2,自引:0,他引:2
基于广域测量系统(WAMS)和同步数字体系(SDH)光纤环网的广泛应用,广域继电保护有助于解决传统后备保护整定配合复杂,潮流转移时引起级联跳闸等问题成为目前研究的热点之一。本文基于分区域分布集中式广域继电保护系统结构,提出一种新型广域后备保护方法,该方法结合系统故障时线路序电压和序电流的分布特点,实时监视分区域各母线序电压的启动,通过对启动母线序电压进行排序选出疑似故障线路,并利用疑似线路两侧的序电流相位和幅值比较构成广域后备保护故障线路识别判据:区外故障时,电流相位相同,大小相等;区外故障时,电流相位相反,大小不定。该方法只需上传故障疑似线路信息,减小了系统的通信量和计算量,同时采用分布参数线路模型消除线路分布电容的影响。该方法原理简洁,易于整定,且适用于系统高阻接地、非全相运行、转换性故障及潮流转移等复杂运行工况,IEEE 10机39节点系统仿真结果表明了算法的有效性和适应性。 相似文献
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广域后备保护利用电网线路IED和母线IED采集各元件相关信息,构造基于PSO-LIBSVM的线路和母线故障识别网络。以IED采集的信息作为输入向量,建立故障识别网络的训练样本矩阵;PSO算法寻找最优LIBSVM运行参数并训练故障识别网络,利用随机故障下的测试样本矩阵对线路和母线识别网络进行测试,以识别电网故障元件IED,进而确定故障元件。通过大量实验仿真了多种信息不准确情况下的故障识别,实验证明基于PSO-LIBSVM的广域后备保护新算法,识别准确率高,具有很好的容错性。 相似文献
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由于广域继电保护在解决传统保护难题方面具有优势,相关技术研究受到了广泛和持续的关注。从广域继电保护基本作用出发,分析广域继电保护的特点和功能要求,阐述基于在线自适应整定原理和基于故障元件判别原理实现广域继电保护的两个基本途径,讨论有限广域继电保护的概念,探讨基于故障元件判别原理的广域继电保护主要研究内容和技术要求,并据此要求介绍几种广域继电保护的新型故障元件判别原理和算法。 相似文献
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The urgent problem of the relaying protection in the modern AC/DC hybrid connected grid and the development of the wide area communication, the information process and the intelligent technology powerfully promotes the development of the technology of the wide area relaying protection (WARP), which has become a research hotspot that attracts extensive attention. Originated from the basic concept of the wide area relaying protection, this paper analyses the advantages, the effects and the functions of the wide area relaying protection. The two main approaches to realize the wide area protection, which are on-line adaptive setting (OAS) rinciple and fault element identification (FEI), are introduced in this paper. Aimed at improving the performance of the backup protection, the research content and the technology demand of the wide area protection are proposed, meanwhile, the basic principle and the algorithm of the fault element identification are introduced. At last, the scheme of the limited wide area relaying protection based on the existing pilot channel of the main protection is discussed. 相似文献
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The urgent problem of the relaying protection in the modern AC/DC hybrid connected grid and the development of the wide area communication, the information process and the intelligent technology powerfully promotes the development of the technology of the wide area relaying protection (WARP), which has become a research hotspot that attracts extensive attention. Originated from the basic concept of the wide area relaying protection, this paper analyses the advantages, the effects and the functions of the wide area relaying protection. The two main approaches to realize the wide area protection, which are on-line adaptive setting (OAS) rinciple and fault element identification (FEI), are introduced in this paper. Aimed at improving the performance of the backup protection, the research content and the technology demand of the wide area protection are proposed, meanwhile, the basic principle and the algorithm of the fault element identification are introduced. At last, the scheme of the limited wide area relaying protection based on the existing pilot channel of the main protection is discussed. 相似文献
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The urgent problem of the relaying protection in the modern AC/DC hybrid connected grid and the development
of the wide area communication, the information process and the intelligent technology powerfully promotes the
development of the technology of the wide area relaying protection (WARP), which has become a research hotspot
that attracts extensive attention. Originated from the basic concept of the wide area relaying protection, this paper
analyses the advantages, the effects and the functions of the wide area relaying protection. The two main
approaches to realize the wide area protection, which are on-line adaptive setting (OAS) principle and fault element
identification (FEI), are introduced in this paper. Aimed at improving the performance of the backup protection, the
research content and the technology demand of the wide area protection are proposed, meanwhile, the basic
principle and the algorithm of the fault element identification are introduced. At last, the scheme of the limited
wide area relaying protection based on the existing pilot channel of the main protection is discussed. 相似文献
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提出了一种基于负序分量的分布集中式广域后备保护方法。文章利用系统故障时线路负序电压的分布特点,通过对各母线负序电压的排序,确定由疑似故障母线和线路组成的疑似故障区,并采用分层搜索方法,首先对准疑似故障母线及线路关联IED处对应的负序功率方向进行判别,直至判定并切除故障母线或线路。该方法仅需将定义的准疑似故障区域的信息上传至决策中心,系统计算量和通信量大为减少,从而加快了故障元件的识别速度。算例仿真结果表明,该方法在高阻接地、潮流转移过负荷及转换性故障运行情况下均能良好动作,验证了此方法的有效性以及适用性。 相似文献
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随着电网的日趋扩大化与复杂化,基于广域多点信息的广域继电保护系统在向工程实际化转变的过程中越来越受到通信水平的制约。基于广域继电保护系统有限性的思想,对复杂结构的电网进行有序的区域划分,并将故障的识别与保护的动作在各个区域内完成,减小了对通信系统的压力。针对已划分的保护区域,提出了基于故障方向信息比较原理的区域故障识别算法,利用故障时方向元件判别的故障方向,经简单的运算,判断故障的位置。以IEEE10机39节点系统为例,对保护区域进行了划分,并对其中一个保护区域内的故障情况进行了仿真验证,其结果验证了故障识别算法的可行性。 相似文献