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******本科毕业论文变电站电压无功综合控制系统设计学生姓名：************学生学号：000000000000院（系）：*******88******年级专业：*********************指导教师：二〇一一年五月本科毕业论文摘要I摘要无功补偿是保证电力系统运行稳定，降低线路损耗，提高经济效益和保证电压质量的基本条件。国内变电站配备有载调压变压器和并联电容器组，通过合理地调节变压器分接头和投切电容器组，可以很大程度上改善电网电压质量，实现无功功率合理补偿。变电站电压无功综合控制系统的目标是在保证电压合格、无功功率基本平衡的基础上尽量减少调节次数。九区图划分的电压无功调节判据，实际运行时在临界区域容易造成振荡和装置动作频繁，针对传统九区图控制策略的不足，本文引入了基于变量计算的VQC策略，通过这种策略算法得出变压器分接头和电容器投切开关的动作方案。通过基于变量计算的VQC策略与传统九区图VQC策略相比，前者在不降低电压无功控制效果，同时能够减少有载调压器分接头和并联电容器组的调节次数，提高了电气设备使用寿命。关键词：无功补偿，电压无功控制，变量计算VQC策略本科毕业论文ABSTRACTIIABSTRACTReactivecompensationistoguaranteethesystemrunsstablyandreducepowerlineloss,improvetheeconomicbenefitandensurethebasicconditionsofvoltagequality.Domesticsubstationequippedwithon-loadchangertransformerandparallelcapacitorgroup,throughreasonablyregulatingtransformerpointsjointandthrewcuttingcapacitorset,canlargelyimprovethenetworkvoltagequalityandrealizingreactivepowerreasonablecompensation.Voltagereactive-powerintegratedcontrolsystem'sgoalistoensurevoltagequalified,reactivepowerbasedonthebasicbalancetominimizeregulationfrequency.Nineareagraphpartitionvoltagereactiveadjustingcriterion,whenactualoperationincriticalregionseasilycauseoscillationanddeviceisfrequent,conventionalnineareachartdeficiencyofcontrolstrategybasedonvariable,thispaperintroducestheVQCstrategy,calculatedbythisstrategythattransformerpointsjointandalgorithmofcapacitorswitchingactionplan.ThroughtheVQCstrategybasedonvariablecalculationwithtraditionalnineareachart,theformerVQCstrategyinnotlowerthanvoltagereactive-powercontroleffectalsocanreduceon-loadpressureregulatorpointjointandparallelcapacitorgroupofregulation,improvingthefrequencyelectricequipmentusinglife.Keywords:reactivepowercompensation,voltagereactivecontrol,variablecalculationVQCstrategy本科毕业论文目录I目录摘要..............................................................................................................................IABSTRACT................................................................................................................II1绪论.........................................................................................................................11.1选题背景和意义................................................................................................11.2国内外研究现状................................................................................................21.3本文主要工作....................................................................................................32无功补偿控制原理设计.........................................................................................42.1无功补偿容量计算标准......................................................................................42.2传统补偿控制判据介绍......................................................................................72.3九区图电压无功控制策略..................................................................................82.3.1九区图基本原理..................................................................................................92.3.2九区图不合理动作分析....................................................................................112.3.3九区图控制策略其他缺陷................................................................................132.4基于变量计算的VQC策略原理.......................................................................143系统硬件设计.......................................................................................................183.1系统功能要求..................................................................................................183.2控制系统硬件结构...........................................................................................183.3电源电路.........................................................................................................203.4模拟数据采集电路...........................................................................................213.5开关量输入输出电路.......................................................................................224系统的软件设计...................................................................................................244.1系统的主程序流程...........................................................................................244.2数据模块采集程序设计....................................................................................254.3基于变量计算VQC策略判断控制...................................................................274.4运行控制模块..................................................................................................284.5VQC策略控制效果..........................................................................................30结论...........................................................................................................................34参考文献...............................................................................................................35致谢...........................................................................................................................36本科毕业论文1绪论11绪论1.1选题背景和意义电压是衡量电能质量的一个重要指标，保证电压接近额定值是电力系统运行调整的重要任务之一。这是由于各种用电设备都有是按额定电压设计制造的，电压偏移过大不仅对用户的正常工作产生不利影响，还可使