配电网电能质量的在线检测与治理措置的研究本科毕业设计

本科毕业设计说明书配电网电能质量的在线检测与治理措置的研究DISTRIBUTIONNETWORKPOWERQUALITYDETECTIONANDTREATMENTRENEWONLINERESEARCH学院（部）：电气与信息工程学院专业班级：学生姓名：指导教师：年月日安徽理工大学毕业设计I配电网电能质量的在线检测与治理措置的研究摘要随着电力电子技术、自动化技术、计算机技术等先进技术的进一步发展，大功率非线性、冲击性和波动性负荷不断增加，比如大功率的变频设备及拖动装置、电气化铁路、电化工业的整流设备、电弧炉等，这些负荷造成了电网发生波形畸变（谐波）、电压波动、闪变、三相不平衡、非对称性，使得电网电能质量的严重降低。同时，基于计算机，微处理器控制的精密电子仪器在国民经济企业中大量使用，对供电质量的敏感程度越来越高，对电能质量提出了更高的要求，从而使电能质量问题及其解决措施逐渐成为研究的热点。要对电网的电能质量进行改善，首先要对电能质量做出精确的检测和分析，测量电网的电能质量水平，并分析和判断造成各种电能质量问题的原因，为电能质量的改善提供依据。电能质量问题日益突出，电能质量的监测方式主要为在线监测，对电能质量的全天候、全方位准确的实时监测。在准确、快速地检测和分析电能质量的基础上，提出了合理有效的治理措施，对有效提高供电可靠性，改善供电电能质量，确保电力设备发挥正常性能水平等，对电网的安全、经济运行，保障工业产品质量和科学实验的正常运行以及降低能耗等均具有非常重要的研究意义。关键词：配电网，电能质量，在线监测安徽理工大学毕业设计IIDISTRIBUTIONNETWORKPOWERQUALITYDETECTIONANDTREATMENTRENEWONLINERESEARCHABSTRACTWiththepowerelectronicstechnology,automationtechnology,computertechnologyandotheradvancedtechnology,furtherdevelopment,high-powernonlinearloadimpactandincreasingvolatilityanddragequipment,electricrailway,electricityandchemicalindustriesrectifierequipment,inductionfurnace,electricarcfurnace,etc,whichcausedthepowergridloadwaveformdistortion(harmonic),voltagefluctuations,flicker,three-phasebalance,asymmetry,makingtheseriousdegradationofpowerquality.Meanwhile,computer-based,microprocessor-controlledprecisionelectronicinstrumentusedextensivelyinthenationalenterprise,thepowersupplyisbecomingmoresensitivetothequalityofthepowerqualityputforwardhigherrequirements,sothatthepowerqualityproblemsandtheirsolutionsmeasurestograduallybecomearesearchhotspot.Toimprovethequalityofgridpower,wemustfirstmakeanaccuratepowerqualitytestingandanalysis,measurementgridpowerquality,andtoanalyzeanddeterminethecauseofavarietyofpowerqualityproblemistoprovideabasistoimprovepowerquality.Powerqualityissueshavebecomeincreasinglyprominent,themainmodeofpowerqualitymonitoringfortheonlinemonitoringofpowerqualityall-weather,all-roundandaccuratereal-timemonitoring.Intheaccurateandrapiddetectionandanalysisofpowerqualitybasedonreasonableandeffectivegovernanceproposedmeasures,effectivelyimprovepowersupplyreliability,improvepowerqualitypowersupply,ensurethatthepowertoplayanormallevelofperformanceequipment,etc.onthepowergridsafety,economicoperationtoprotectthequalityofindustrialproductsandthenormaloperationofscientificexperimentsandreduceenergyconsumptionetc.isveryimportantsignificance.KEYWARDS:distributionnetwork,powerquality,onlinemonitoring安徽理工大学毕业设计III目录摘要......................................................................IABSTRACT.................................................................II1绪论....................................................................11.1研究电能质量的背景和意义..........................................11.2国内外研究现状....................................................11.2.1电能质量监测系统.............................................11.2.2电能质量治理措施.............................................21.3本文的主要工作....................................................32电能质量理论............................................................52.1电能质量概述......................................................52.1.1电能质量的定义...............................................52.1.2电能质量的分类...............................................52.2电能质量指标和国家标准............................................62.2.1电压偏差.....................................................62.2.2频率偏差.....................................................62.2.3谐波.........................................................62.2.4电压波动和闪变...............................................72.2.5三相不平衡...................................................82.2.6暂时过电压和瞬态过电压.......................................92.3本章小结..........................................................93电能质量检测分析算法...................................................103.1基于瞬时无功功率理论的谐波检测方法...............................103.1.1qpii..运算方式.............................................103.1.2基于倍频旋转变换的谐波测量..................................113.2基于小波分析的谐波检测方法.......................................113.3基于神经网络的谐波检测方法.......................................123.4基于傅里叶变换的谐波检测方法.....................................123.4.1傅里叶级数..................................................123.4.2离散傅里叶变化(DFT).........................................133.4.3快速傅里叶变换(FFT).........................................143.4.4改进型复序列快速傅里叶变换(FFT).............................153.4.5其它电能质量参数的计算......................................17安徽理工大学毕业设计IV3.3本章小结.........................................................174配电网电能质量在线监测系统的研究.......................................184.1系统硬件设计......................................................184.1.2信号调理电路................................................194.1.3过零检测电路................................................224.2DSP处理模块......................................................234.2.1DSP芯片选型及其详细介绍....................................234.2.2电源........................................................264.3串口通信模块......................................................274.4键盘及液晶显示模块................................................274.4.1键盘