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1、中文摘要摘要近年来,随着电力电子技术的发展,电网中具有非线性、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。本文首先针对谐波问题,叙述了谐波产生原因、危害等,并介绍了谐波抑制方法。其中,有源电力滤波器是抑制电网谐波的有效手段之一,这种滤波器能对频率和幅度都变化的谐波进行跟踪补偿,且补偿特性不受电网阻抗的影响,因而受到了广泛重视。其次,对有源电力滤波器的基本原理、分类和基本组成进行了阐述。本文重
2、点研究了谐波电流的检测方法。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。详细介绍了瞬时基于无功功率理论的几种谐波和无功电流检测方法:p-q检测法、检测法和dq0检测法,并分析了它们的检测原理、特点及使用局限性。本文建立MATLAB/Simulink的仿真模型,着重对基于瞬时无功功率理论的几种谐波电流检测方法:p-q检测法、检测法分别进行仿真,并对比仿真结果,得出较好的谐波或无功电流检测方案。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
3、果。关键词:有源电力滤波器,瞬时无功功率,电流检测,仿真45ARSTRACTAbstractInrecentyears,withthedevelopmentofpowergrids,convertersaretobeawiderangeofdevelopmentandapplication.Thoughitslarge-scaletransformationoftheenergyandtransportplayasignificantrole,italsobroughtpollutiontoth
4、epowergrid,resultinginaharmonic.Theseharmonicstotheelectricalequipmenthazards.Forharmonicsuppressionandreactivepower,powersystemapplicationsofthefilter.However,theshortcomingsofpassivepowerfilter,activepowerfilterhasbeenarapiddevelopment.Harmonicsupp
5、ressionmethodoffilteringtechnologyaremainlypassiveandactivepowerfiltertechnology.Activepowerfiltertechnologyandpassivepowerfiltertechnology,withlittleeffectbythegridimpedance,dynamiccompensationtotheadvantagesofharmonicpollutioningovernancehasplayeda
6、leadingrole.Activepowerfilterofthestudyfocusedonthemaincircuitstructureoftheform(inseries,parallelandseries-parallel),harmoniccurrentdetectionmethodandthecompensationcurrentcontrolmethods.Thisarticlefocusesontheharmoniccurrentdetectionmethod.Thispape
7、ranalyzestheemergenceofpowersystemharmonicsandhazards,ofpowertheoryandthetheoryofinstantaneouspoweranalysis,comparison,pointingoutthattheirscopeandtheadvantagesanddisadvantages.Detailedinformationontheinstantaneousreactivepowertheorybasedonthenumbero
8、fharmonicsandreactivecurrentdetectingmethod,p-qdetectionmethod,detectionmethodanddq0detectionandanalysisoftheirdetectionprinciple,characteristicsanduselimitation.MATLAB/Simulinksimulationmodel,focusingoninstantaneousreactivepowerbasedonthetheoryofhar