毕业设计(论文)题目基于LABVIEW的电能质量监测仪设计姓名周攀学号0710211214所在学院电气与电子工程学院专业班级07电气2班指导教师余瑜日期2011年06月06日摘要目前,供电企业和用户开始高度重视对电网电能质量监测的问题。一方面是因为影响电能质量的因素日益增多,如今广泛使用非线性设备和电力电子装置,使电网中的电流和电压波形发生畸变,导致电能质量的恶化。另一方面,各种精密、复杂的,对电能质量敏感的电气设备的普及,使人们对电能的可靠性及其质量的要求与日俱增。因此,研究供电质量监测的方法,找出导致电能质量下降的原因具有重要的工程和理论价值。本论文设计并给出了以测控领域的最新技术——虚拟仪器平台为基础的电能质量监测系统。该系统能够对电流、电压、频率、相位、电网谐波、三相电压不平衡度、电压波动和闪变等电能质量参数进行实时地监测,并且具有在线分析功能。本文是使用美国NI公司开发的图形化开发软件LABVIEW进行系统程序构建,结合使用NI公司的配套设备PCI-6024E(数据采集卡)以及传感器、变送器等硬件设备,组建了一套电能质量监测仪系统。关键词:电能质量,在线监测系统,LABVIEW,虚拟仪器AbstractPowerqualityisanessentialconcernofelectricalutilitiesandcustomers.Ononehand,thefactorswhichaffectthepowerqualityareincreasing,forexample,thedistortedwaveofvoltagesandcurrentscausedbytheextensiveapplicationofpowerelectronicapparatusandnonlinearequipmenthasworsenedthepowerquality.Ontheotherhand,thepopularityofthecomplicated,exactitudeandpowerquality-sensitiveelectricityapplianceshasmadepowerqualitymoreimportant.Researchonthepowerqualitymonitoringandanalysismethodisofgreatvalueinboththeoryandpractice.Thispaperwasdesignedbasedonthelatesttechnologyincontrolfield-powerqualityparametersmonitorsystemonthevirtualinstrumenttechnologyplatform.Itcanmonitorelectricpowerparametersincludingvoltage,electricalcurrent,phase,frequency,three-phasevoltageunbalance,harmonicandthevoltagefluctuationandflicker,andcanalsoprovidedetailedpowerqualityanalysisinrealtime.ThispaperistouseAmericanNIcompany'sgraphicalLABVIEWsoftwaretobuiltthesystem,byusingacombinationofconstructionprogramNIcompanyauxiliaryequipmentPCI-6024E(dataacquisitioncard),sensorandtransmittershardwareequipment,establishedasetofpowerqualitymonitoringwithprecismeasurementability.Keywords:powerquality,on-linemonitoringsystem,LABVIEW,virtualinstrument目录摘要................................................................IAbstract...............................................................II目录..............................................................III1.绪论................................................................11.1课题研究背景与意义..............................................11.2国内外对电能质量的监测研究现状..................................21.3本论文主要工作..................................................22.电能质量指标及测量方法..............................................42.1电能质量指标简介................................................42.2电网电压允许偏差................................................42.3电网频率允许偏差................................................52.4电网三相电压允许不平衡度........................................62.5公用电网谐波....................................................82.6电压波动和闪变.................................................113.电能质量测量过程中的相关问题.......................................133.1采样定理.......................................................133.2混叠现象与FFT分析...................................