HVDC与SVC非线性协调控制的研究

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1、四川大学硕士学位论文HVDC与SVC非线性协调控制的研究姓名：杨波申请学位级别：硕士专业：电力系统及其自动化指导教师：刘天琪20060430在第五章中，为了提高多机交直流系统稳定性的同时也能更好地稳定直流系统逆变侧的电压，提出了HVDC与SVC的最优变目标控制策略，通过综合建模，推导出了三机交直流混合系统中HVDC和SVC的综合控制规律。该控制规律将系统趋于稳定点的过程分段实现，首先驱动系统达到按最大稳定域选取的人工中间动态平衡点，然后驱动系统达到所希望的平衡点。仿真结果表明，所设计的控制器有效地增强了系统阻尼，抑制发电机功角摇摆，同时也较好地改善了逆变侧交流母线电压，

2、改善了系统的动态特性。关键词：高压直流输电：静止无功补偿器；附加功率调制；协调控制；非线性控制；最优变目标控制nTheResearchofNonlinearCooperativeControlinHVDCandSVCSystemMajorElectricPowerSystemandItsAutomationGraduateYangBoAdvisorTianqiLiuWiththedevelopmentofelectricpowerindustryandeconomicgrowth,thedistributionofresourc鼯andloadsisasymmetric

3、al，whichpresentschallengewiththetransmissionoflong-distance．Therefore，itisastrategicchoicethatChinaachievesthegoalof"transmissionelectricpowerfromwesttoeast,exchangeelectricpowerbetweensouthandnorthandintercormectioninthewholecountry"．Higllvoltagedirectcurrent(HVDC)transmissionsystems，wh

4、icharefitfortransmissionelectricpowerwithlongdistanceandlargecapability,willdemonstrateitsadvantagesanditisalsoallopportunityforHVDCdevelopingin0111"country．HVDChasbeenvaluedmoreandmorebecauseofitsadvantages,suchasitslargecapability,longdistancetransmissionandfastcontrol，anditwilltakeall

5、importantseatinthepowernetworkofOUrcountry．OwingtothecontrollabilityofHVDC，controlsystembecomesthecoreoftheI-IVDCsystems，anditsworkconditionandtheperformanceofitsbasiccontrollerwillbothaffectthew．holesystemingreatmeasure．IthasbeenprovedthattheadditonalpowermodulationofHVDCCallimprovethes

6、tabiliv／ofAC／DCsystems，buttheconvenerwillconsumemuchofreactivepower．Forthisreason,accordingtothecharacteristicsofHVDCandaimingatadvancingthestabilityofAC／DCsystems,thispaperstudiedthecooperativecontrolbetweenpowermodulationofHVDCandSVC．Focusingonthecontradietionbetweentheconsumedreactive

7、powerofinverterandthevoltagestability,thechapter4adoptedSVCtocompensatereactivepowerofinverterSOthatitmakethevoltageatinvertersidemorestabile．AftermodelingasystemequationofHVDCandSVC，thestatefeedbackexactlinearizafiontheoryis。HIutilizedtOlinearizethestateequationthroughad