无锁相环的谐波与无功电流实时检测方法研究

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1、西南交通大学研究生学位论文无锁相环的谐波与无功电流实时检测方法研究年姓级二oo三级名申请学位级别专业指导教师丁菊霞工学硕士电力电子与电力传动张秀峰教授二oo七年一月西南交通大学硕士研究生学位论文第1I页AbstractWiththefastdevelopmentofelectricpowertechnology,thevariouselectricequipmentareapplieddiffusely，andtheharmcausedbyharmoniousarousespeople’Sattention．Itbecomesapopproblemthathowtolimitharmon

2、icsandcompensatereactivecurrents．Atpresent，itisanimportanttendencytolimitharmonicsbyactivepowerfilter．Thekeytechnologyofactivepowerfilterisreal—timedetectingharmonicsandreactivecurrents，especially,accuracyandreal-timeabilityofthetestconsequencearemaininfluentialfactorsofcompensatoryeffect．Inthepa

3、per,themethodofseparatingactivecurrentsinsingle-phasecircuitisstudieddeeplyandadetectingmethodwithoutphase—lockedloopforharmonicsandreactivecurrentsinsingle—phasecircuitisbroughtforward．Testifiedthroughanalysisandsimulation，thismethodisprovedtodetectharmonicsandfundamentalactiveandreactivecurrent

4、swellandtruly．Comparedwiththemethodofseparatingactivecurrentsinsingle-phasecircuit，undertheconditionofnoincreasingdelaytime，thismethodcanavoidtheefrcctofphase-lockedloopandimprovethedetectingveracity．Adetectingmethodwithoutphase-lockedloopforharmonicsandreactivecurrentsinthree-phasecircuitisputfo

5、rwardtoointhispaper．Testifiedthroughanalysisandsimulation，thismethodisprovedthatitCandetectthree-phasefundamentalpositivevoltages、three-phasefundamentalpositivecurrents、three-phasefundamentalpositiveactivecurrentsandothercurrenthefttomeettheneedofcompensation，whetherelectricvoltagearesymmetricala

6、ndaberrance，anditcanbeappliedinthree-phasethree-wirecircuitandinthree-phasefour-wirecircuit．KeyWords：activepowerfilter；detecting；fundamentalcurrent；harmonicreactivecurrent；phase—lockedloop西南交通大学硕士研究生学位论文第1页第1章绪论随着电力电子装置等非线性负载的广泛应用，在电网中注入了大量的谐波和无功电流，从而使设备容量和线路损耗增加，发电和配电设备的利用率下降，谐波和无功电流污染已成为影响电能质量的

7、重要问题。要提高电能质量，必须对谐波和无功电流进行实时补偿。如果要实现实时补偿，必须将谐波和无功电流从负载电流中分离出来，即实时检测谐波和无功电流。有源电力滤波器APF(ActivePowerFilter)是当前谐波抑制的一个重要趋势。其基本原理是通过某种谐波检测方法来获取谐波补偿的指令信号，由该指令信号去控制其PWM主电路，从而输出所需要的谐波补偿信号，来抵消电网中存在的谐波，达到谐波抑制和无功功率补偿的目的。显然，谐波补偿效果与