本科毕业设计（论文）珠海横琴新区配电网规划摘要随着国家经济的快速发展，用电负荷增长迅速，电网现状已难以满足日益增长的供电需求，必须要加快电网建设。中压配电网在高低压电网之间起着承上启下的用，中压电压等级的选择直接影响到电力系统的稳定性、电能质量和电网的投资成本。首先，本文综述国内外20kV中压配电电压的应用情况，认为在高负荷密度新兴园区应用20kV电压等级是配电网发展的趋势，对珠海横琴新区发展定位及电网现状进行了介绍。然后，本文描述电网规划的一般方法，包括电网规划的步骤，电网的结线方式，等。在对影响电压层级优选的主要技术、经济因素进行分析总结的基础上，对珠海横琴新区2020年用电负荷总量及地理分布进行预测，并对220/110/10kV，220/110/20kV,220/20kV三种电压层级方案的建设规模及投资进行比较，建议横琴新区采用220/20kV电压层级。最后，论文给出了220/20kV电压层级下横琴新区详细的配电网规划方案，包括：各变电站20KV出线方案、各变电站中压出线电气联络方案及中低压配电网建设工程量计算等。20kV中压电压等级的建设成本较低，推行中压20kV电压等级符合国家建设资源节约型、环境友好型社会。有利于降损节能、节约用地，避免出线走廊过于拥挤等。因此，应积极响应推广发展中压20kV电压等级。关键词：负荷预测，配电网规划，20kV，电压层级优选AbstractWiththerapiddevelopmentofthenationaleconomy,electricityloadgrowthrapidly,thecurrentstatusofpowergridhasbeendifficulttomeettheincreasingdemandofpowersupply,sowemustaccelerateconstructionofelectrifiednetting.Mediumvoltagedistributionnetworkplaysanimportantroleinhighandlowvoltagepowergrid,mediumtagelevelselectiondirectlyaffectthestabilityofthepowersystem,powerqualityandthepowergridinvestmentcost.First,thispaperreviewedtheapplicationof20KVmediumvoltageareintroducedinthispaper,putsforwardthe20KVvoltagelevelapplicationisinevitabletrend,andcarryoutthesimpleintroductionoftheZhuhaiHengqinnewareanetworkpresentsituation.Then,thispaperalsointroducesgeneralmethodsincludenetworkplanning,powergridplanningsteps,gridconnectionmode.ThispaperalsointroducedtheZhuhaiHengqinnewareaelectricityloadforecastin2020,aswellasthevoltagelevelofoptimizationtechnology,economicanalysis.Finally,thispaperalsocarryouttheHengqinnewareadetailedplanningofdistributionnetwork,including:eachsubstation20KVoutlet,thepressureoutletelectricalsubstationprojectliaisonprogrammeandinthelowvoltagedistributionnetworkconstructionengineeringquantitycalculation.ThisarticlethroughthreedifferentschemesinZhuhaiHengqinnewareaofdistributionoftechnicalandeconomicanalysis,finallyconcludedby220KVstraightdown20KVsubstationprojectinvestmentcostisthesmallest,mosteconomic.Asthedemandforpowerincreasesceaselessly,mediumvo