基于暂态热流耦合仿真的沟内密集堆积配电电缆群载流能力预测及新增负荷优化配置  

Ampacity Prediction of Densely Stacked Distribution Cables in Trench and Optimal Allocation of New Load Based on Transient Thermal-fluid Coupling Simulation

作　　者：范华 翁利国 平伟军 练德强 李小潇 牛海清[3] FAN Hua;WENG Liguo;PING Weijun;LIAN Deqiang;LI Xiaoxiao;NIU Haiqing(Zhejiang Zhongxin Power Engineering Construction Co.,Ltd.,Hangzhou 311201,China;State Grid Zhejiang Hangzhou Xiaoshan District Power Supply Co.,Ltd.,Hangzhou 311201,China;School of Electric Power,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]浙江中新电力工程建设有限公司,杭州311201 [2]国网浙江杭州市萧山区供电公司,杭州311201 [3]华南理工大学电力学院,广州510641

出　　处：《高电压技术》2023年第12期5002-5010,共9页High Voltage Engineering

基　　金：浙江中新电力工程建设有限公司科技项目(HDXS3-2110037)。

摘　　要：配电电缆在电缆沟内堆积现象普遍存在,会加剧各回路间的热影响,降低电缆群的载流能力。针对某站出线电缆沟的实际情况,建立沟内密集堆积电缆群的热流耦合仿真模型,并实验验证了模型计算的准确性;加载负荷电流曲线开展沟内电缆群的暂态热流耦合仿真计算,研究了电缆群的当前运行状态;采用COSMOLwith MATLAB联合仿真及差分进化算法,对空载、重载和断面电缆群的载流能力进行预测,并对给定新增负荷在轻载线路和全电缆进行优化配置。结果表明,在其他条件不变的情况下,电缆位置及其周围电缆负荷情况影响其散热进而影响其载流量,预测的4条空载线路的最大和最小载流量相差约8.8%;电缆的初始负荷越重、温度越高,预测载流量的负荷增加系数越小;利用暂态热流耦合仿真结合差分进化算法可最大化电缆群的载流能力,可使新增负荷分布更为合理并降低电缆群温度。Distribution cables accumulation in trench is common,which intensifies the thermal impact among cables and reduces their ampacity.In this paper,according to the actual situation of a substation outgoing cables in trench,a ther-mal-fluid coupling simulation model is established,and the simulation accuracy is verified by its measured temperature.Load current is applied to the model,and their operating status is simulated.COSMOL with MATLAB co-simulation and differential evolution algorithm are used to predict their ampacity of no-load,heavy-load and section cables,and to opti-mize the configuration of the given new load on the light-load cables and all cables.The results show that,remaining the other conditions,the position and the load around the cable affect its heat dissipation and then affect its ampacity.The difference between the maximum and minimum ampacity predicted of the four no-load cables is about 8.8%.The higher the initial load is and the higher the temperature of cables is,the smaller the ampacity increase coefficient will be.Transi-ent heat flow coupling simulation combined with differential evolution algorithm can maximize the predicted ampacity of cables,make the new load distribution more reasonable,and reduce their temperature.

关 键 词：沟内电缆群 暂态温度 载流能力 负荷配置 差分进化法 

分 类 号：TM75[电气工程—电力系统及自动化]