基于模糊自適應(yīng)算法的直流換流閥溫度控制系統(tǒng)研究.pdf

1、寧夏大學(xué)碩士學(xué)位論文基于模糊自適應(yīng)算法的直流換流閥溫度控制系統(tǒng)研究姓名：張莉娟申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電路與系統(tǒng)指導(dǎo)教師：劉大銘201104IIAbstractHighvoltageDCtechnologyakeydevelopingtechnologicalareainChinaisoneofthemostadvancedenergysavingtechnologiesinthewld.ThebasicprincipleofHVDCi

2、stotransfmACtoDCthroughaconverterinturntotransfmDCtoACbyaninverterimplementingthepowertransmissionpowergridinterconnection.ValveisthemostimptantpartinDCtransmissionwhileconverterisabridgearmoftheThreePhaseBridgeneededtor

3、ealizecommutating.ConverterisanindispensableelementfthevalveintransfmingtheDCtoACviceversa.TherefeitsoperationinsafetyplaysavitalroleinDCtransmission.Theheatproducedbyvalveinwkingwillhelpincreasethechip’stemperature.Ifth

4、erearenoappropriatemeasurestakentodissipatetheheatitwoulddestroythedeviceoncethetemperaturesurpassesthejointtemperature.HencetheheatdissipationofvalveinHVDCtransmissionbecomesasignificantissue.Choosingaproperwaytodissipa

5、tetheheathavingareasonabledesignaswellisacriticallinktomakethemostuseofthedevicetostrengthenthereliabilityofthecircuit.Otherwiseitwillaffectvalve’swkingefficiencyevenitsoperatinglife.Inregardtothematterofheatdissipationo

6、fvalvethispaperfocusesonamostenergysavingcoolingapproachwaterwindcoolingsystemwhichisalsocalledclosedloopwatercoolingsystem.Inthiswaythevalvecoolingsystemusestheairwatertocooldownthetemperature.Theprimarymethodisthedeion

7、izedwatercirculationcoolingwhilethesecondaryistheaircoolingbyusinganaircoolingmachine.ThepaperhasdesignedatemperaturecontrolalgithmbasedonafuzzyselfadaptivePIDadoptingaSiemensS7300asacontrollertocontrolthetemperatureofva

8、lve.Itwillcontrolthecirculatingwaterinaccuracyindertoachievethepurposeofheatdissipationthustoimprovethereliabilityofthecircuittheguaranteedefficiencyofvalve.Keywds：converter，waterwindcoolingsystem，fuzzyselfadaptivePID，fr