光伏電源逆變器的設(shè)計(jì)(畢業(yè)設(shè)計(jì)論文)

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1、河南科技大學(xué)本科畢業(yè)設(shè)計(jì)（論文）光伏電源逆變器的設(shè)計(jì)摘要隨著傳統(tǒng)的三大化石能源日漸枯竭，綠色能源的開發(fā)和利用將會(huì)得到空前的發(fā)展，太陽能作為世界上最清潔的綠色能源之一，起并網(wǎng)發(fā)電備受世界各國普遍關(guān)注。而光伏并網(wǎng)發(fā)電系統(tǒng)的核心部件，如何可靠的高質(zhì)量地向電網(wǎng)輸送功率尤為重要，因此在可再生能源并網(wǎng)發(fā)電系統(tǒng)中起點(diǎn)能變換作用的逆變器成為了研究的一個(gè)熱點(diǎn)。為此本文仍然采用“全橋逆變+LC濾波+工頻升壓”的逆變電源設(shè)計(jì)方案。整個(gè)系統(tǒng)設(shè)計(jì)分為SPWM波形產(chǎn)生電路、H橋驅(qū)動(dòng)及逆變電路、欠壓過流保護(hù)電路。在SPWM波形產(chǎn)生環(huán)節(jié)，本文采用脈寬調(diào)制芯片SG3525的為核心。由文氏橋振

2、蕩電路產(chǎn)生50Hz的正弦波基準(zhǔn)信號(hào)。然后經(jīng)過精密整流、放大等處理輸入到SG3525的補(bǔ)償信號(hào)端，從而輸出SPWM波。最后進(jìn)行死區(qū)延時(shí)，輸入到驅(qū)動(dòng)電路中。在驅(qū)動(dòng)電路設(shè)計(jì)環(huán)節(jié)中，本文采用兩片IR2110半橋驅(qū)動(dòng)芯片構(gòu)成全橋驅(qū)動(dòng)電路。輸出側(cè)逆變電路中開關(guān)管選用耐壓值高的MOSFET。然后經(jīng)過工頻變壓器進(jìn)行升壓到市電，供家用電器使用。對輸入、輸出進(jìn)行采樣，實(shí)時(shí)監(jiān)控是否欠壓、過流，進(jìn)行保護(hù)動(dòng)作。最后，給出額定功率為500W（輸入電壓12V輸出交流220V）的單相逆變器樣機(jī)的試驗(yàn)波形。關(guān)鍵詞：光伏電源，逆變器，SPWM，SG3525，IR211052河南科技大學(xué)本科畢業(yè)

3、設(shè)計(jì)（論文）DESIGNOFPVPOWERINVERTERABSTRACTInrecentyears,photovoltaictechnologyhasbroadapplication.Asourcountry'snewenergylawenacted,thephotovoltaicpowersysteminourcountrywillhaveabroaderspacefordevelopment.InverterisanimportantcomponentinPVsystem.Itsperformancehasgreatinfluenceontheappl

4、icationofphotovoltaicsystem.Currently,thedomesticpuresinewaveoutputinvertermainlyuses50Hztransformerforraisingtheoutputvoltage,thispaperisstilldevelopedaninverterbyusingthe“Full-bridgecircuit+LCfilter+Isolatortransformer”designproposal.ThewholesystemisdividedintoSPWMwaveformgenerat

5、orcircuit,Hbridgedrivercircuitandtheinvertercircuit,lowvoltageandover-currentprotectioncircuit.InSPWMwaveformgenerationpart,thispaperusesSG3525PWMchipcore.TheWienbridgeoscillationcircuitgenerates50Hzsinereferencesignal.Afterthissignalprecisionrectification,amplificationandotherproc

6、essingofthecompensationsignalinputtotheSG3525-side,sothispartoutputtheSPWMwave.Finally,theSPWMsignalsenterintothedrivingcircuitafterdead-timedelay.Inthedesignofdrivecircuitpart,usingtwoIR2110half-bridgedriverchipsconstituteafull-bridgedrivercircuit.Theoutputsideofinverterswitchcirc

7、uitselectshighvoltagevalueMOSFET.Thenthrough50Hztransformer,boosttothemainsforhouseholdappliances.Testingthesamplesoftheinputandoutputvoltage,real-timemonitoringisunder-voltage,overcurrent,protectionaction.Finally,ratedpowerfor500W(Inputvoltage12V,Outputcommunication220V)single-pha

8、seacinverterprototypetestw