低压无功补偿器的设计-毕业论文

毕业设计说明书低压无功补偿器的设计学生姓名：张海明班级学号：206040834院、系、部电力工程学院专业：电气工程及其自动化（智能建筑电气）指导教师：陆旦宏讲师合作指导教师：2008年06月南京UndergraduateDesign(Thesis)THEDESIGNOFREACTIVEPOWERCOMPENSATIONSYSTEMFORLOWVOLTAGEBYZHANGhai-mingSupervisedbyLecturerLUDan-HongSchoolofElectricPowerEngineeringNanjingInstituteofTechnologyJune2008张海明：低压无功补偿器的设计I摘要本课题研究以低压电网无功补偿改造为背景，研制了一种低压无功功率补偿控制器。作为一种非实时的无功补偿装置，该装置以定时的电网监测数据为依据，以城镇低压网(220V)的无功补偿为对象。本文主要研究了无功补偿对电网性能的改善，以及控制器的软硬件的配置。系统采用5189CAT单片机，该单片机是美国ATMEL公司生产的低电压，高性能的CMOS8位单片机，具有运算速度高，实时性好的特点；软件则使用汇编语言进行编译；人机操作界面采用LCD显示,显示效果较好；A/D转换采用0809ADC，是一款比较实用的A/D转换装置。该装置可跟踪电网无功功率的变化并自动补偿,实现了无功补偿装置的优化运行,具有体积小、原理简单、智能投切等优点。关键词：无功补偿,单片机,低电压AbstractWhatthisarticlestudiesisbasedonthealterationofreactivepowercompensationoflowvoltage,thendesignanequipmentforreactivepowercompensationoflowvoltage.Asakindofreactivepowercompensation,thisequipmentisbasisontheelectricalnetworkmonitordata,andprovidesreactivepowerforcity’slowvoltagepowergrids.Thisthesishasdiscussedtheimportanceofthereactivepowercompensationforthepowergrids,andintrodudedthehardwareandsoftwareofthecontroller.Thisdevice'shardwarecoreisAT89C51SCM,whichhasmanymeritssuchashighoperatingspeed.ThismonolithicintegratedcircuitisthelowvoltagewhichAmericanATMELCorporationproduces,ahighperformanceCMOS8monolithicintegratedcircuits;Thesoftwareusestheassemblylanguagetocarryonthetranslation;Theman-machineoperationcontactsurfaceusestheLCDdemonstration,thedemonstrationeffectisquitegood;A/DtransformationusesADC0809,itisasectionofquitepracticalA/Dswitchingdevice.Thisequipmentmaytracktheelectricalnetworkreactive南京工程学院电力工程学院毕业设计(论文)IIpowerthechangeandtheautomaticcompensation,andthisinstallmenthasthevolumetobesmall,theprecisionishigh,thepricecomparedtothehighermerit.KeyWords:reactivepowercompensation,SCM(SingleChipMicyoco),lowvoltage南京工程学院电力工程学院毕业设计(论文)II目录摘要.................................................................................................................................IABSTRACT.....................................................................................................................I目录.................................................................................................................................II第一章绪论................................................................................................................-1-1．1研究背景.............................................................................................................-1-1．2无功补偿装置的发展状况.................................................................................-2-1．3本课题主要研究的内容....................................................................................-4-第二章无功补偿的原理............................................................................................-6-2．1无功补偿的原理................................................................................................-7-2．2低压电网中的几种无功补偿的方式................................................................-9-2．3确定补偿容量的几种方法...............................................................................-10-2．4本章小结..........................................................................................................-12-第三章硬件设计......................................................................................................-13-3．1无功补偿装置的技术要求..............................................................................-13-3．2硬件介绍...........................................................................................................-14-3．3模拟信号调理电路...........................................................................................-22-3．4输出控制电路..................................................................................................-25-3．5本章小结..........................................................................................................-26-第四章软件设计....................................................................................................-27-4．1投切原则..........................................................................................................-27-4．2功率因数计算...................................................................................................-28-4．3本章小结..........................................................................................................-30-第五章总结与展望..................................................................................................-31-致谢............................................................................................................................-32-参考文献：................................................................................................................-32-附录1：外文翻译及资料.........................................................................................-34-A1.1实际中的谐波和无功补偿...............................................................................-34-张海明：低压无功补偿器设计IIIA1.2HarmonicsandReactivePowerCompensationinPractice..............................-38-附录2：装置结构硬件图.............................................................