摘要
电缆供电不仅具有传输距离长、损耗小的优点,而且不占用地上空间,但在小负荷方式下较大的对地电容易出现无功返送,甚至电压越限的情况。为探讨电缆充电功率对电压的影响,根据电缆电气参数的计算及π型等值电路,分析了电缆线路电压与线路长度的关系,给出了无功补偿方案;利用IEEE 9节点仿真模型,研究了分别使用电缆和架空线时各节点的电压。研究结果表明小负荷方式下,电缆线路各节点的电压较架空线路更高,且个别节点电压已超出限值;每隔25 km安装无功补偿装置补偿后,各节点电压明显下降。
Cable power supply not only has the advantages of long transmission distance and low loss,but also does not occupy the ground space.However,it's the large capacitance of cables to ground in the mode of small load can lead to reactive reversal or even voltage violation.In order to analyze the influence of cable charging power on voltage,according to calculation of cable electrical parameters and 0x0E?SymbolpA@0x0F-type equivalent circuit,the relationship between cable line voltage and line length is analyzed,and the reactive compensation scheme is given.The voltage of each node is studied when cables and overhead lines are used respectively with the IEEE 9-node simulation model.The research results show that under small load mode,voltage of each node of cable line is higher than that of overhead line,and voltages of some nodes exceed the limit value.After the installation of reactive compensation devices every 25 km,the voltage of each node drops significantly.
作者
李鑫
刘炯
马海木呷
梁明
刘翰柱
熊高林
LI Xin;LIU Jiong;MA Haimuga;LIANG Ming;LIU Hanzhu;XIONG Gaolin(Southwest Electric Power Design Institute Co.,Ltd.of CPECC,Chengdu 610056,China)
出处
《电工技术》
2023年第23期65-68,共4页
Electric Engineering
关键词
城市电缆
电容效应
电压控制
无功补偿
urban cable
capacitance effect
voltage control
reactive compensation
