辽宁电网应用220/10kV的直降供电模式  

Application of 220 kV Directly Step-down to 10 kV Power Supply Mode in Liaoning Power Grid

作　　者：宁辽逸[1] 吴卓航[1] 全成浩[1] 沈方[1] 刘剑[1] 胡大龙[1] 宋颖巍[1] 刘岩[1] 

机构地区：[1]国网辽宁省电力有限公司经济技术研究院,沈阳市110016

出　　处：《电力建设》2014年第8期54-61,共8页Electric Power Construction

摘　　要：针对城市中心负荷密度较大地区的变电站以及线路走廊征地困难、用地成本高的问题,提出采取220/10 kV方案,减少电力设施建设用地,以节约建设成本。结合辽宁电网实际,构建了220/66/10 kV和220/10 kV两种电压序列的供电网络模型,并从建设规模、占地面积、单位负荷供电费用和10 kV线路末端电压偏差率等方面进行了技术经济对比分析。分析结果表明,在负荷密度大于15 MW/km2的城市负荷中心区采取220/10 kV直降方案供电能取得较好的技术经济效益。直降变电站选点还需综合考虑220 kV主变容量需求,220 kV电源进线容易,周边66 kV网架整理的意义不大,而10 kV网架整理的需求迫切等因素。In order to solve the difficulty land requisition and high land cost problems for substation and line corridor in high load density regions,this paper put forward a scheme of 220 kV directly step-down to 10 kV to reduce the construction land of power facilities and save the cost of construction.According to the actual situations of power grid in Liaoning,this paper built two kinds of power supply models for 220/10 kV and 220/66/10 kV voltage sequences,and analyzed the technical and economic indicators,including the construction scale,the occupied area,the power supply cost of unit load and the terminal voltage deviation rate of 10 kV line.The results show that the 220/10 kV directly step-down to 10 kV scheme used in urban load center with load density higher than 15MW/km2 can attain better economic benefit.It is suggested that the area selection for directly step-down substation should think over four aspects：the capacity requirements of main transformer,easily 220 kV power supply,no requirement for 66 kV network,and high demand for 10 kV network.

关 键 词：220 10 KV 电网模型 电压序列 负荷密度 电压偏差率 

分 类 号：TM727[电气工程—电力系统及自动化]