低压电力线信道阻抗特性的分析

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1、gatheringsystemisprocessed．ThemeasuringresultsworeprocessedbythetoolofMatlab，thentheamplitude-frequencyandphase—frequencycharacteristiccurvesofpowerlinechannelimpedanceweredescribedandtherelationship谢ththeimpedanceandfrequency,time，accesspoint，typeofloadandtopologicalstructureofpowergridWasanalyzedi

2、ndetail．Afterdetailedanalysis，wedidn’tjustgetsomeconclusionsthatdovetail、Ⅳi也thepreviousresearchachievements，bmdrawsomenewconclusions：03themodulevalueandphaseofpowerlinechannelmeasuredindifferenta(矧防spointofthesametransformerdistrictaredifferent,buttheyvaryinasteadydataextent．②themodulevalueandphaseo

3、fpowerlinechannelmeasuredatdifferenttimeofthe．sameaccesspointaredifferent,butnleyvaryinasteadydataextent．Accordingtotheconclusions①and②，themethodofpiecewisepolynomialfittingonthebasisofleastsquaresWasproposedtoestablishtheimpedancemodelofpowerlinechannelindifferentaCCesSpo血ofthesametransformerdistri

4、ctandatdifferenttimeofthesameaccesspoint．Finally,theimpedancemodelswerecheckedandthevalidationresultsshowedthatthecalculatedvaluebasedonimpedancemodelsagreewellwitllthemeasuredvalue，whichprovedthatthemodelingmethodisreasonableandtheimpedancemodesaleKeywords：Powerlinecarriercommunication，PowerLineCha

5、nnel，Measurementofimpedance，Impedancecharacteristics，Impedancemodelinglll2．1低压电力线信道特性分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯72．2几种阻抗测量原理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯82．2．1平衡电桥法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．82．2．2谐振法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．82．2．3I-Vj去⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯92．2．4网络分析法

6、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．92．2．5自动平衡电桥法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯102．3常用的电力线信道阻抗测量方法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．102．3．1双电流探头法2．3．2比值法⋯⋯⋯⋯2．3．3系统辨识法⋯2．3．4矢量伏安法⋯2．4电力线信道阻抗建模方法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯182．4．1最小二乘法原理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯182．4．2多项式拟合⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。l92．5本章小结⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

7、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯2l第三章低压电力线信道阻抗测量系统设计一⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯223．1改进的比值法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯223．2阻抗测量电路设计⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．233．2．1信号发生源⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯243．2．2耦合电路⋯⋯⋯⋯⋯