CAJ | 학술논문

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。
침대성시중심부하밀도교대지구적변전참이급선로주랑정지곤난、용지성본고적문제，제출채취220/10 kV방안，감소전력설시건설용지，이절약건설성본。결합료녕전망실제，구건료220/66/10 kV화220/10 kV량충전압서렬적공전망락모형，병종건설규모、점지면적、단위부하공전비용화10 kV선로말단전압편차솔등방면진행료기술경제대비분석。분석결과표명，재부하밀도대우15 MW/km2적성시부하중심구채취220/10 kV직강방안공전능취득교호적기술경제효익。직강변전참선점환수종합고필220 kV주변용량수구，220 kV전원진선용역，주변66 kV망가정리적의의불대，이10 kV망가정리적수구박절등인소。
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.