电网谐波电流仿真研究

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1、摘要近年来，随着电力电子技术的发展，电网屮具冇非线性、冲击性和不平衡用电特性的负荷不断增加，产生大量谐波。电网中的谐波污染日益严重，影响到供电质量和用户使用的安全性，因此电网谐波污染的治理越来越受到关注。木文首先针对谐波问题，叙述了谐波产生原因、危害等；其次，对谐波及无功功率理论的基本概念及原理进行了较为详细的介绍，并分别介绍了两种检测方法及适用条件；再次就三相三线制及三相四线制电路了搭建模型做出来比较分析；最后介绍了搭建模型具体方法并对仿真波形进行了分析。本文对平均功率理论和瞬时功率理论进行了分析、比较，指出了它们适用的范围及优缺点。详细介绍了瞬吋基于无功功率理论的谐波和无功电流检测方

2、法—叫检测法，并分析了它的检测原理、特点。木文建立MATLAB/Simulink的仿真模型，着重对基丁勺舜时无功功率理论的ip-iq检测法进行仿真，得出较好的谐波检测方案。针对不同的负载和负载突变情况进行了仿真，得出不同方法的使用条件和最优结果。关键词：谐波，瞬吋无功功率，电流检测，仿真ABSTRACTInrecentyears,withthedevelopmentofpowergrids,convertersaretobeawiderangeofdevelopmentandapplication.Thoughitslarge-scaletransformationoftheenergy

3、andtransportplayasignificantrole,italsobroughtpollutiontothepowergrid,resultinginaharmonic.Theseharmonicstotheelectricalequipmenthazards.ForhaiTnonicsuppressionandreactivepower,powersystemapplicationsofthefilter.However，theshortcomingsofpassivepowerfilter,activepowerfilterhasbeenarapiddevelopment

4、.Thispaperdescribestheharmonicproblems,causes,andharm;secondly,describesthebasicconceptandprincipleoftheharmonicandreactivepowertheoryindetail,andintroducestwokindsofdetectionmethodandapplicationconditions;thenonthethreephasethreewireandfourphasethreewirecircuitmodelismadeacomparativeanalysisofth

5、estructures;finallyintroducesthespecificmethodofbuildingmodelandthesimulationwaveformsareanalyzed.Thispaperanalyzestheaveragepowertheorysystemandinstantaneouspowertheory，pointingoutthattheirscopeandtheadvantagesanddisadvantages-Detailedinformationontheinstantaneousreactivepowertheorybasedonharmon

6、icsandreactivecuiTentdetectingmethod,ip一icjdetectionmethodandanalysisofitsdetectionprinciple,characteristicsanduselimitation.MATLAB/Simulinksimulationmodel,focusingoninstantaneousreactivepowerbasedonthetheoryofharmoniccurrentdetectionmethodofip-iqdetectionmethodsimulations,werecarriedoutandcompar

7、edtheexperimentalresults,obtainingbetterharmonicsdetectionprogram.Fordifferentmutationloadandloadsimulationexperiments,theuseofdifferentmethodstoarriveattheconditionsandoptimalresults.Keywords:harmonicsinstantaneousrea