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1、基千DSP的電力諧波檢鍘系統(tǒng)的研究與設(shè)計摘要近年來,由于各種電力電子器件等非線性設(shè)備的廣泛應(yīng)用,使得諧波對電網(wǎng)的影響和危害日益嚴(yán)重,造成電能質(zhì)量的嚴(yán)重惡化。若不加以控制,會嚴(yán)重影響整個電網(wǎng)安全、經(jīng)濟的運行。因此實時、準(zhǔn)確的檢測電網(wǎng)中諧波含量,確切掌握電網(wǎng)中諧波的實際情況,對于防止諧波的危害,保障電網(wǎng)安全具有重要的現(xiàn)實意義。本文首先概括介紹了諧波分析算法的理論依據(jù)。其中,采用快速傅立葉變換進行電力系統(tǒng)諧波檢測時很難做到同步采樣和整周期截斷,由此造成的頻譜泄漏將影響諧波檢測結(jié)果.從而引入了加窗插值FFT算法,本文對該算法進行了較為深入的分析和推導(dǎo),并采用Matlab對其進行了仿真分析,驗
2、證了該算法的正確性與易實現(xiàn)性。然后,應(yīng)用TMS320LF2407A數(shù)字信號處理芯片為硬件核心,詳細設(shè)計了電力諧波檢測系統(tǒng)的硬件電路,包括信號采集部分、AID轉(zhuǎn)換部分、液晶顯示部分和數(shù)據(jù)通信部分等。最后,本文完成了系統(tǒng)的主要軟件設(shè)計,給出了相應(yīng)模塊的程序流程。本系統(tǒng)諧波檢測軟件己經(jīng)進行初步調(diào)試,結(jié)果表明,本文理論分析正確,算法的精度和實時性都能很好的滿足諧波檢測的實際要求,硬件設(shè)計實現(xiàn)簡單,具有一定的實用價值。關(guān)鍵詞:諧波,快速傅立葉變換,加窗插值,TMS320LF2407A,數(shù)字信號處理基于DSP的電力諧破檢測系統(tǒng)的研究與垃計AbstractInrecentyears,withthe
3、、Ⅳideapplicationofvariouskindsofnon-linerloads,theharmonicpollutionofelectricnetismoreandmoreseriousandthequalityofelectricpowerisdeclining.Iftheharmoniccan’tbecontrolled,itwillaffectthewholeelectricnetrunningsafeandeconomical.So,itisnecessarytOpreventtheharmonicperilandtO貓suresaferunningofthep
4、owersystemwithdetectingaccurateharmoniccontentandpredominatinghafnlomepracticestatusfirmly.Firstly,thepapergenerallyintroducesthetheoryoftheharmonicanalySisalgorithm.Thereinto,thereare$fficultiesinperformingsynchronizedsamplingandintegralperiodtruncationforthelmrmonicanalysisinthepowersystemwit
5、htheFastFourierTransform(FFT),theresultoftheelectricpowerharmonicdetectionisdisturbedbythefrequencyIeal婦ge,SOtheWindow-interpolationFFTisintroduced.ThispaperanalyzesanddeducestheWindow-interpolationFFTalgorithmindetail,thenanalyzesthealgorithmbyMatlabsimulation.Thesimulationresultshaveverifiedt
6、heeffeetivenessandpmcticabilityofthealgorithm.Secondly,thepaperusestheDSPprocessorchipTMS320LF2407Aashardwarecoreandgivesdetectionsystem’Shardwaredesignindetail,suohassignalgatheringpart,A/Dconvertingpart,liquidcrystaldisplayingpart,datacommunicationpartandSOon.Finally,thedissertationfinishesth
7、emainsoRwaredesignandgivescorrespondingmodule’Sprocedureprocess.TheSoftwareofharmonicdetectionalgorithmhasbeendebuggedinlaboratory.Thepracticalsimulatinghasprovedthattheanalyfisofthetheoryiscorrect,thereal—timecharacterandaccuracy