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1、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202
2、0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
3、划,20kV,电压层级优选AbstractWiththerapiddevelopmentofthenationaleconomy,electricityloadgrowthrapidly,thecurrentstatusofpowergridhasbeendifficulttomeettheincreasingdemandofpowersupply,sowemustaccelerateconstructionofelectrifiednetting.Mediumvoltagedistributionnetworkplaysanimportantroleinhighandl
4、owvoltagepowergrid,mediumtagelevelselectiondirectlyaffectthestabilityofthepowersystem,powerqualityandthepowergridinvestmentcost.First,thispaperreviewedtheapplicationof20KVmediumvoltageareintroducedinthispaper,putsforwardthe20KVvoltagelevelapplicationisinevitabletrend,andcarryoutthesimplei
5、ntroductionoftheZhuhaiHengqinnewareanetworkpresentsituation.Then,thispaperalsointroducesgeneralmethodsincludenetworkplanning,powergridplanningsteps,gridconnectionmode.ThispaperalsointroducedtheZhuhaiHengqinnewareaelectricityloadforecastin2020,aswellasthevoltagelevelofoptimizationtechnolog
6、y,economicanalysis.Finally,thispaperalsocarryouttheHengqinnewareadetailedplanningofdistributionnetwork,including:eachsubstation20KVoutlet,thepressureoutletelectricalsubstationprojectliaisonprogrammeandinthelowvoltagedistributionnetworkconstructionengineeringquantitycalculation.Thisarticle
7、throughthreedifferentschemesinZhuhaiHengqinnewareaofdistributionoftechnicalandeconomicanalysis,finallyconcludedby220KVstraightdown20KVsubstationprojectinvestmentcostisthesmallest,mosteconomic.Asthedemandforpowerincreasesceaselessly,mediumvoltagedistributionnetworkre