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ID:36457941
大小:2.77 MB
页数:96页
时间:2019-05-10
《电气信号数字化检测技术及应用研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、学校代号:10532学号:B990913密级:湖南大学博士学位论文V‘83:j0I】1电气信号数字化检测技术及应用研究堂僮宴遣厶丝名!黄纯一何怡刚教授三!兰竺兰竺竺:昱盎熬援境羞皇僮;塑直太堂———童些刍箍;皂王堡迨量堑撞盎一——论室握窑目期!至立竖生3月——迨塞签燃且期;2QQ量生§且.——鳘整叠虽垒圭廑!姚建刚熬攫——电气信号数字化检测技术及应用研究过卷积运算,并适当添零生成;其幅频特性在零点处的l至m一1阶导数均为0,在零点附近的值很小,这一特性使其特别适合于电气信号的检测。6)提出了基于卷积窗的谐波检测算法。算法对采
2、样序列加卷积窗,有效抑制了基波及整数次谐波之间的相互干扰,与谐波分析常用的余弦窗相比,加卷积窗可以获得高得多的计算精度;此外,采用基于相位比较的校正算法,并通过对校正算法实现方法的改进,显著减小计算量。7)提出了一种电压、电流有效值及有功功率的测量算法,该算法将有效值或有功功率的估计,转化为对某一构造信号的零频率分量的估计,并设计一脉冲响应为卷积窗的多阻带滤波器,用该滤波器滤除构造信号中的基波及各次谐波分量,实现在采样存在同步误差时的有效值和有功功率的高精度测量。8)将上述研究成果应用到电气信号数字检测的实践中,研制了“微机
3、型电容补偿及谐波滤波成套设备”、“谐波滤波器微机监控装置”、“微机型自动准同期并列装置”、“基于虚拟仪器技术的电气参数综合测试仪”等设备。关键词:电气信号;检测;微机:频谱分析:同步采样;数字信号处理;窗函数博士学位论文AbstractModempowerindustrydemandsthatpowersystemsandelectricdevicesmustrununderdigitalsupervise,control,andprotection,whicharebasedonthereal-time,accurate,
4、andreliableanalyzingandmeasuringofelectricsignals.Applyingdigitalsignalprocesstheory,micro—computertechnology,andpowersystemautomationtechnology,thisdissertationresearchesontheoriesandmethodsformoreaccurate,faster,lesscost,andmorepracticableelectricsignalmeasuring,
5、andpaymoreattentiononimprovingsignalsamplingmethodsanddevelopingreasonableelectricparameterestimatingalgorithm.Themainworkandthecontributionsaregivenasfollows.1)ThetraditionalsynchronizingmethodsofACsampling,includinghardwaresynchronoussampling,softwaresynchronouss
6、ampling,andasynchronoussampling,areexamined;thefactorsthatcausesynchronizationerroranduniformityerrorarethenfoundout.Somenovelmethods,designedtominishtheseerrorsandimprovemeasurementaccuracy,arewhereafterproposed.Especiallytothesoftwaresynchronoussampling,whichismo
7、stcommonusednOW,threenovelmethodsaredesigned.Thefirstadjuststhesamplingspace—timedynamicallySOthatthesamplingmomentsapproachtheidealones;thesecondmodifiestheactualsamplestowardanidealsamplingsequencebymeansoflinearinterpolationalgorithm;thethirdevaluatesthesignalfu
8、ndamentalperiodinreal—timeandmodifiesthesamplingperiod.Allthemethodsareeasytoimplement,Canbewidelyappliedandneedlessadditionalwork.Itishelpfulfor
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