10 kV交流XLPE电缆改为直流运行的热电耦合仿真

为了研究电缆在不同敷设方式和直流拓扑结构时的直流运行参数,以10?kV交流配电网中广泛使用的三芯交联聚乙烯(cross-linked?polyethylene,XLPE)电缆为例,通过有限元仿真软件建立电缆温度场、流场和电场耦合仿真模型,对直埋敷设、排管敷设和沟槽敷设下电缆分别以双极式、单极式、三线双极式(three-...

Thermo-Electric Coupling Simulation for 10 kV AC XLPE Cable in DC Operation

To study the DC operation parameters of the 10 kV AC cable in different laying modes and DC operation topologies, according to the example of the three-core cross-linked polyethylene (XLPE) cable widely used in 10 kV AC distribution network, the temperature field, flow field and electric field coupling simulation models are established through finite element simulation software. The temperature field, the flow field, the steady electric field and the transient electric field are analyzed respectively, in the cases of the cable laid in the soil, pipeline and trench (three laying modes) and operating in the bipole, monopole and triple (three-wire bipole structure-high voltage direct current, TWBS-HVDC) DC operation modes (three DC operation topologies). The results show that for the same laying mode, the TWBS-HVDC has the highest DC ampacity, while the monopole mode has the lowest DC ampacity. The DC voltage levels of the 10 kV AC cable in the three laying modes and three DC operation topologies are 10 kV and leave a certain voltage margin. The cable in the trench and monopole mode has the highest maximum DC transmission power, i.e., 13.2 MW, whereas the cable in the pipeline and bipole mode has the lowest maximum DC transmission power i.e., 8.7 MW. The maximum transmission power of the AC cable will have a significant increase after the cable is converted into DC operation.