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1、隨著我國(guó)經(jīng)濟(jì)的迅猛發(fā)展,對(duì)配電自動(dòng)化要求越來(lái)越高,而配電自動(dòng)化的核心在于饋線自動(dòng)化,饋線自動(dòng)化的基本單元?jiǎng)t是饋線終端單元F1’U,它對(duì)整個(gè)配電自動(dòng)化起十分重要的作用。針對(duì)國(guó)內(nèi)外對(duì)配網(wǎng)饋線終端單元F1-U的研究現(xiàn)狀,提出了全新的FTU的設(shè)計(jì)方案。首先,提出了F,I'U的工作原理以及本次設(shè)計(jì)所要實(shí)現(xiàn)的功能,包括電度采集、故障檢測(cè)和故障隔離等。其次,詳細(xì)介紹了F,I’U的硬件和軟件設(shè)計(jì)。在硬件方面選用了ARM9作為主控制芯片,相對(duì)以前依靠5l或者96系列單片機(jī)完成設(shè)計(jì)的F,I’U有了進(jìn)一步的提高,^Pc~19芯片具有強(qiáng)大的數(shù)
2、據(jù)處理功能和豐富的外圍接口,為F,IIU的設(shè)計(jì)提供了強(qiáng)有力的硬件支持。另外還設(shè)計(jì)了外圍電路,包括模擬量輸入電路,開(kāi)關(guān)量輸入輸出電路,通信電路,電源模塊電路等。采用了CAN總線技術(shù),大大提高了電力系統(tǒng)的通信能力。在軟件編程方面,采用了基于Linux平臺(tái)的嵌入式系統(tǒng),提高了系統(tǒng)的實(shí)時(shí)性、可靠性、靈活性。編寫(xiě)了各模塊的程序,并給出軟件流程圖,完成了整個(gè)FTU的軟件設(shè)計(jì)。最后,對(duì)FTU的信號(hào)處理技術(shù)進(jìn)行研究,對(duì)FFT算法、頻率采樣算法給出具體的設(shè)計(jì)過(guò)程,并在電力諧波檢測(cè)方面進(jìn)行仿真,分析了數(shù)據(jù)采樣點(diǎn)數(shù)和噪聲對(duì)信號(hào)檢測(cè)的影響。在
3、實(shí)驗(yàn)室完成調(diào)試。實(shí)驗(yàn)調(diào)試證明,基于ARM9的饋線終端單元F,I'U具有良好的功能,在提高配電網(wǎng)運(yùn)行的可靠性和效率,提高供電質(zhì)量,降低勞動(dòng)強(qiáng)度,縮短停電時(shí)間和減少停電面積等方面,均帶來(lái)了可觀的經(jīng)濟(jì)效益和社會(huì)效益。關(guān)鍵詞配電自動(dòng)化,饋線終端單元,ARM9,CAN總線,嵌入式系統(tǒng)ABSTRACTAlong麗thoafcountryeconomyswiftandviolentdevelopment,therequestforthepowerdistributionautomationismoreandmorehigh,andt
4、hepowerdistributionautomationcoreliesinthefeedlineautomation.ThefeedlineautomationbasicunitisF1U,itisofextremelyvitalroletoentirepowerdistributionautomation.Accordingtothedevelopmentprospectoffeederterminalunitonhomeandabroad.a(chǎn)llnewimplementingschemeofFTUisgiven
5、.First,itpresentsF1Uactionprinciplesandfunctionsofpoweracquisitionincludingenergyacquisition,faultdetectionandfaultisolationetc.Secondly,ThesoftwareandhardwareofFTUaledescribeddetails.Inthehardwarepart,ARM9chipisadoptedforCPU,ithasfurtherimprovementtocompletethe
6、FTUofrel姐ngonthe51or96MCU.ARM9chiphasapowerfuldataprocessingcapabilitiesandrichperipheralinterfaces,thesegivethedesignofFTUpowerfulhardwaresupport.Inaddition,theperipherycircuitsdesignedincludeanalogsignalsinputmodule,digitalsignalsmodule,communicationmodule,pow
7、ermoduleetc.CANbusisadoptedonthecommunicationmoduleofthedesigntoimprovegreatlythepowercommunication.EmbeddedrealtimeoperatingsystembasedonLinuxsystemisusedtoenhancereal—timeperformance,reliabilityandflexibility.Theprogramsofallmodulesarewrittenandgiventhesoftwar
8、eflowchart.CompletethewholesoftwaredesignofFTU.Finally,thesignalprocessingofFTUisresearched.FFTalgorithmand仔equency’samplingalgorithmaregivendetaildesignprocess.Toana