【作者】 曾木华；

【导师】 王时胜；

【作者基本信息】 南昌大学 ， 控制理论与控制工程， 2010， 硕士

【摘要】 本课题来源于和某企业的合作,计划设计出一套企业配电网故障综合选线智能应用系统。在电力系统中,中性点的接地方式可以分成两种：一种是大电流接地方式,它主要包括：中性点直接接地,中性点经电阻(低电阻或者中电阻)接地,以及中性点经低电抗接地；另外一种是小电流接地方式,主要有：中性点不接地、中性点经消弧线圈接地、以及中性点经高电阻接地这三种接地行式。目前,小电流接地系统单相接地故障选线装置均采用集中式结构,配电网多条线路的现场数据(零序电压、零序电流等)通过信号传输线送至故障选线装置集中采集,集中处理,这种方法由于现场到故障选线装置之间是模拟信号传输,极易受到干扰,且CPU或一个环节故障会引起整个系统瘫痪,故弊端多。本课题是对现场数据采集处理单元的研究,在现场总线型故障选线装置中,每条线路配置基于FPGA的数据采集处理器,对现场的数据进行采集与处理,将处理的数据通过PROFIBUS总线传递给信息融合选线单元,完成数据的采集、分析及现场数字通信。更多还原

【Abstract】 The issue comes from the cooperation of an enterprise, plans to design an aptitude applications system of comprehensive fault line selection for enterprise distribution network.Power system neutral grounding can be divided into two categories:high-current grounding (the neutral point effectively grounding) and the small-current grounding (the neutral point non-effectively grounding). In the high current ground way, there are:neutral grounding, neutral point of low resistance, low electrical resistance or the resistance grounding; in the small current ground way, there are: neutral point coil grounding, neutral ungrounded and high-resistance grounding the neutral point, etc.At present, the small current grounding system of single phase fault line devices are centralized structure, the field data of distribution network and more lines (zero sequence voltage, zero sequence current, line voltage, etc.) through the signal transmission line sent to the equipment of fault line select to centralized collection, centralized treatment, this methodology owing to the fault line selection field between the devices is analog signal transmission, and ssusceptible to interference, the CPU or a link failure will cause the entire system can’t work, so there is many drawback. This issue is field data acquisition and processing unit studies in field bus-based fault detection devices, each circuit configuration data acquisition based on FPGA processors, field data acquisition and processing, the processed data through the PROFIBUS bus passed to the fusion line selection unit, the completion of data collection, analysis, and digital communications field.更多还原