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高压直流输电换流站无功功率控制策略研究.docx

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高压直流输电换流站无功功率控制策略研究 Title:StudyonReactivePowerControlStrategyforHigh-VoltageDirectCurrentSubstations Abstract: High-VoltageDirectCurrent(HVDC)transmissionsystemshavegainedsignificantimportanceinrecentyearsduetotheirabilitytoefficientlytransmitlargeamountsofpoweroverlongdistances.HVDCconverterstationsplayacrucialroleinconvertingACpowertoDCandviceversa.Whileactivepowercontrolhasbeenextensivelystudied,reactivepowercontrolisequallyimportanttomaintainsystemstabilityandvoltageregulation.ThispaperaimstoexplorevariousstrategiesforcontrollingreactivepowerinHVDCconverterstationsandtheirimpactonsystemperformance. 1.Introduction TheintroductionprovidesanoverviewofHVDCtechnologyanditsadvantagesovertraditionalACtransmissionsystems.Italsoemphasizestheimportanceofreactivepowercontrolinmaintainingpowersystemstabilityandvoltageregulation.Theobjectivesandstructureofthepaperarepresented. 2.HVDCConverterStationOverview ThissectionprovidesadetaileddescriptionofthecomponentsandoperationofanHVDCconverterstation.Itincludesanexplanationofthedifferenttypesofconverters(line-commutatedandvoltage-sourceconverters)andtheirrespectivecontrolstrategies.Theimportanceofreactivepowercontrolinconverterstationsishighlighted. 3.ReactivePowerControlStrategies ThissectiondiscussesdifferentreactivepowercontrolstrategiesemployedinHVDCconverterstations.Itbeginswithabriefoverviewoftraditionalcontrolapproaches,suchasfixedreactivepowercompensationandthyristor-controlledreactors.Thefocusthenshiftstomoreadvancedcontroltechniques,including: 3.1VoltageDroopControl Thisstrategyadjuststheconverter'scontrolparameterstoregulatetheconverter'soutputvoltagebasedonthedroopcharacteristic.Itexplorestheimpactofdroopcontrolonreactivepowerexchangeandvoltageregulation. 3.2ReactivePowerFeedbackControl ThisstrategyutilizesmeasurementsofACandDCsidevoltagesandcurrentstodynamicallyadjustthereactivepoweroutput.Theimpactofdifferentcontrolgainsonsystemperformanceandstabilityisanalyzed. 3.3CoordinatedControlwithACSystem Thisstrategyoptimiz