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作 者:黄磊[1] 程浩忠[1] 欧阳武[1] 姚白沙 吴争[2] 董震威[2]
机构地区:[1]上海交通大学电气工程系,上海200240 [2]无锡供电公司,江苏无锡214001
出 处:《电力系统保护与控制》2009年第20期1-6,共6页Power System Protection and Control
基 金:国家重点基础研究发展计划(973计划)资助(2009CB219703)
摘 要:经过江苏省许多地市的实践,中压配电电压由10kV升高为20kV已被证明是可行的。220/110/20kV三级电压制供电系统由于相邻电压数值之间的比例减小,导致供电区域重叠,设备的供电能力不能充分发挥。以江苏某市为例,提出以规划年单位负荷供电费用为评价指标的数学模型,并运用计算几何中的Voronoi图,优化220kV变电站的供电区域。在此基础上通过计算规划年不同负荷密度下220/110/20kV供电系统和220/20kV供电系统的单位负荷供电费用,得出在一定条件下当城市负荷密度发展到一定水平时,采用220/20kV供电方案将获得较小单位负荷供电费用的初步结论。因此建议当城市发展到该负荷密度水平时采用220/20kV的供电方案,以避免重复降压,并为今后进一步优化高压配电电压做好准备。Application of 20kV in MV distribution system has been proved to be feasible and advisable with the rapid growing load density in urban areas. The decreasing of gap between neighboring voltage value in the existing 220/110/20kV sequence results in overlapping in power supply area and that the capacity of devices in system cannot be in full use subsequently. Assuming the load in the area is uniformly distributed, this paper proposes a mathematical model with a decision-making index based on power supply cost per unit load and makes a Voronoi diagram based 220kV substation optimal supply area. A case study of a real distribution system in Jiangsu province is employed to make a comparison of the cost per unit load in the horizontal year in both 220/110/20kV and 220/20kV system. Preliminary conclusion about reasonable load density of higher than a certain level is appropriate for voltage sequence in power supply system in special conditions is presented. And it also makes a further suggestion that 110kV be eliminated from the existing voltage sequence in urban distribution system with this load density for avoiding overlapping in voltage stepping down and also getting ready for further HV distribution voltage optimization.
关 键 词:供电方案 负荷密度 电压制 城市电网规划 220/20kV VORONOI图
分 类 号:TM715[电气工程—电力系统及自动化]
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