基于PLC的电力系统无功补偿系统设计

嵌入式应用软件园，版权所有，请勿转载/销售。-1-基于PLC的电力系统无功补偿系统设计摘要无功功率补偿装置在电力系统中所承担的作用是提高电网的功率因数，降低供电变压器及输送线路的损耗，提高供电效率，改善供电环境。所以无功功率补偿装置在电力供电系统中处在一个不可缺少的非常重要的位置。合理的选择补偿装置，可以做到最大限度的减少网络的损耗，使电网质量提高。本设计主要功能是可检测出当前电网的电流电压并可显示，计算出当前的功率因数及无功补偿量，并利用PLC编程控制投切电容实现对电网的无功补偿并显示当前投切状态。本设计中我们的投切控制原理可以用九区图来说明。无功超上限投入电容器，超下限切除电容器。电压超上限调制变压器分接头降低电压，电压超下限调制变压器分接头升高电压。本设计中我们首先要计算出补偿容量并通过它来控制投切。关键字：电力系统；功率因数；无功补偿；九区图；PLC如需此论文Word版本，单片机程序/单片机技术支持，请访问:嵌入式应用软件园。嵌入式应用软件园，版权所有，请勿转载/销售。-2-TheDesignofReactivePowerCompensationSystemBasedonthePLCinElectricPowerSystemAbstractThereactivepowercompensationsystemthefunctionwhichundertakesintheelectricpowersystemisenhancestheelectricalnetworkthepowerfactor，Reducesthepowersupplytransformerandthedeliveryconduitloss,enhancesthepowersupplyefficiency,theimprovementpowersupplyenvironment.Thereforethereactivepowercompensationsystemoccupiesanessentialextremelyimportantpositionintheelectricpowersupplysystem.Thereasonablechoicecompensationsystem,mayachievethemaximumlimitreducednetworktheloss,causestheelectricalnetworkqualityenhancement.Thisdesignmainfunctionismayexaminethecurrentelectricalnetworktheelectriccurrentvoltageandmaydemonstratethat,calculatesthecurrentpowerfactorandtheidleworkcompensatesthequantity,andcompensatesthealgorithmaccordingtotheidleworktothrowusingPLCcutstheelectriccapacityrealizationtocompensateandthedemonstrationtotheelectricalnetworkidleworkcurrentthrowscutsthecondition.Inthisdesignwethrowcutthecontrolprincipletobepossibletousenineareachartstoexplain.Idleworkultraupperlimitinvestmentcapacitor,ultralowerlimitexcisioncapacitor.Thevoltageultraupperlimitmodulationtransformertappingreducesthevoltage,thevoltageultralowerlimitmodulationtransformertappingboosting.Inthisdesignwefirstmustcalculatethecompensationcapacityandcontrolthroughitthrowcut.Keywords：Electricpowersystem;Powerfactor;Thereactivepowercompensation;Nineareacharts；PLC嵌入式应用软件园，版权所有，请勿转载/销售。-3-目录引言.......................................................................................................................................6第1章绪论...............................................................................................................................71.1方案比较及本设计总体方案..........................................................................................71.1.1电力系统传统的智能控制方案...........................................................................71.1.2中低压电网自动化PLC实现..............................................................................81.2本设计的总体方案..........................................................................................................8第2章硬件部分的设计............................................................................................................112.1控制面板.........................................................................................................................112.2互感器.............................................................................................................................122.3相位判别检测电路........................................................................................................142.4主要模块介绍.................................................................................................................152.4.1模拟量输入接口模块：.....................................................................................152.4.2中央处理器模块(CPU).......................................................................................182.5无功补偿装置.................................................................................................................18第3章软件部分的设计............................................................................................................203.1投切部分的软件设计....................................................................................................203.2A/D转换..........................................................................................................................223.3各部分的梯形图与程序................................................................................................233.4PLC编程器.....................................................................................................................28结论和展望...................................................................................................................................29致谢............................................................................................................................................30参考文献.......................................................................................................................................31附录A附图及附表.....................................................................................................................32附录B引用的外文文献及其译文............................................................................................35附录C主要参考文献的题录及摘要.......................................................................................38附录D主要程序.............................................................................................