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1、總第鈣卷第512期2008年第惦期電蔫與儀表日ectricslMment&Imtrum∞tationVoL45N0512Aug.2008基于電力系統(tǒng)ATP仿真模型的諧波分析水胡振華,孫樹平,王海濱,陳蓉芳,陳潔(西華大學(xué)電氣信息學(xué)院,成都610039)摘要:為了減少非同步采樣對快速傅立葉變換的影響,提高電力系統(tǒng)諧波分析的精度,本文詳細(xì)介紹了一種基于四項(xiàng)Blackman—Harris窗插值F兀算法的諧波參數(shù)估計(jì)方法,并推導(dǎo)了其諧波參數(shù)估計(jì)公式,然后利用電磁暫態(tài)仿真程序ATP建立一個(gè)實(shí)際的400/33
2、kV工業(yè)電力系統(tǒng)的仿真模型,對該系統(tǒng)的諧波電流進(jìn)行了仿真,最后針對不同程度的頻譜泄漏,采用F丌和四項(xiàng)Blackman—Harris窗插值FnI兩種算法對諧波電流的16次諧波參數(shù)估計(jì)值進(jìn)行對比分析。實(shí)驗(yàn)結(jié)果表明,在相同條件下,該算法較F兀算法在頻率、幅值和相位的估計(jì)值精度上有明顯提高。關(guān)鍵詞:電力系統(tǒng);諧波分析;快速傅里葉變換;非同步采樣;四項(xiàng)Blackman—Harris窗;插值FFl算法;ATP中圖分類號:TM74文獻(xiàn)標(biāo)識碼:A文章編號:1001—1390(2008)08一0015—06Harm
3、onicanalysiswithllighaccuracybasedonATPsimulationmodelofpowersystemHUZhen-hua,SUNShu-ping,WANGHai-bin,CHENRong-fang,CHENJie(SchoolofElectricalandInformationEngineering,XihuaUniversity,Chengdu610039,China)Abstract:Inordertoreducetlleinfluenceofanunsync
4、hronizedsamplesequenceonlT’I'andtoimprovetheprecisionofharmonicinpowersystem,aharmonicestimationbasedoninterpolationF門algorithmisproposed.TheestimationalgorithmbasedonfourcoefficientsofBlackman-Harriswindowisdiscussedindetailandestimatingformulasofhar
5、monicparameterarededucedinthispaper.Arealindustrial400/33kVpowersystemsimulationmodelisestablishedusingtheATP(thealternativetransientsprogram),andharmoniccurrentinthissystemissimulated.Consideringvar),ingdegreesofspectrumleakage,harmoniccurrentisanaly
6、zedusingn叩algorithmdirectlyandBlackman-Harriswindowwithfourcoefficientsinterpolationn叩algorithm。and12harmonicsparametersarecalculated.Finally,thesimulationresultsofthetwoalgorithmsareanalyzedandcompared.Thesimulatingresultdemonstratesthattheestimation
7、harmonicfrequency,amplitudeandphasearehighlyaccurateusingtheimprovedalgorithmfortheunsynchronizedsamplesequenceanalysis.KeyWords:electricpowersystem。harmonicanalysis,n呵,asynchronoussampling。blackmail—harriswindowwithfourcoefficients。interpolation盯ralg
8、orithm,ATPO引言近幾年,電力公司和工業(yè)界大量增加使用電容器組和電力電子變流器,這兩種趨勢使諧波對電力系統(tǒng)’四川省教育廳自然基金重點(diǎn)資助項(xiàng)目(2∞4All6)的危害越發(fā)加大I”,所以對電網(wǎng)中的諧波含量進(jìn)行實(shí)時(shí)測量,確切掌握電網(wǎng)中諧波的實(shí)際狀況,對于防止諧波危害,維護(hù)電網(wǎng)的安全運(yùn)行是十分必要的。電力系統(tǒng)的諧波分析通常是通過快速傅立葉變換FFr實(shí)現(xiàn)的,然而在數(shù)據(jù)采集時(shí),由于實(shí)際電網(wǎng)頻一15一總第鈣卷第$12期2008年第惦期電翻與儀表ElectricalMmment&Instr