基于DSP和CPLD的轻型直流输电动态模拟换流控制系统的研究与设计

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1、上海交通大学硕士学位论文基于DSP和CPLD的轻型直流输电动态模拟换流控制系统的研究与设计姓名：宋小权申请学位级别：硕士专业：电力系统及其自动化指导教师：孙苓生20070201上海交通大学硕士学位论文路，选用IGBT搭建换流桥，并用CPLD作为换流桥的驱动与控制系统，与DSP配合进行换流系统的控制。并且设计了各个部分的电路模块。（3）在给出具体控制系统的基础之上，详细的分析了CPLD部分的功能，包括与DSP的通信，脉冲发生器的设计，故障检测功能等，并用程序实现这些功能。关键字：VSC，HVDC，SPWM，DSP，CPLD4上海交通大学硕士学位论文APPLICABILITYSTUDYOFD

2、SPANDCPLDINCONVERTINGCONTRLLEROFHVDC-LightSIMULATIONLABABSTRACTTranditionalHVDCtechnologyusesmercuryconverterandphasecommutatedconverterfordistantandlargescalepowertransmission.Mercutyconverterisakindofhalf-controlswitchwhichcanbecontolledtolinkthecurrentbutnottoshutitoff,andworksatalowfrequency.

3、Phasecommutatedconverterhasacomplicatedcircuitandbigvolume,andneedsthepowernetworktosupplyaphasecommutatedvoltage.Theconverterwouldfailtoworkiftheshiftingangleissmallerthantheextinctionangle.TherearetoomanyharmonicsandthepowerqualityistooropyinthetranditionalHVDCsystem.Andthistechnologyisnotsuita

4、bleforthetransmissionofthedistributedandsmallnewenergy.VSC-HVDCwithsomeparticularadvantagesovertheconventionalHVDCisconsideredasamajordevelopmentinHVDCtechnology.ItsolvessomeproblemsoftheconventionalHVDC.Thispaperwillstudyfromthreeaspectslistedasfollows:Thesteady-stateinteractionbetweenVSCanditsc

5、onnectingACsystemareanalyzedandthesteady-statemathematicalmodelsaredeveloped,whichsuitstheVSC-HVDCconnectingtwoactiveACsystems.Thismodeldescribletherelationshipbetweenthecontrolledvariablessuchastheactivepower,reactivepower,voltage,currentandthecontrollingvariablesoftheVSC.Onthebasisofthemodel,th

6、econtrolstrategyisproposed.Inordertotestifythestrategy,theVSC-HVDCcontrolsystemiscreatedaccordingtothestrategy.Atlast,theoperationperformanceoftheVSC-HVDCundersomecharacteristicfaultedconditionswithoutanyprotectionmeasuresarestudied,andtheover-currentandover-voltageoftheVSC-HVDCduringthosefaultsi

7、sstudied.SomeprotectionstrategiesareproposedtopreventtheVSC-HVDCfromover-voltageandover-currentdamageinmostfault5上海交通大学硕士学位论文conditions.DSPisusedtocollectthedataandcreatethecontrolsystem.TheIGBTisusedtocreatetheconvert