Thermo-Electric Coupling Simulation for 10 kV AC XLPE Cable in DC Operation
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摘要:
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-wire bipole structure-high voltage direct current，TWBS-HVDC） 3种直流拓扑结构运行时的温度分布、流场分布和暂稳态电场分布进行了仿真分析. 结果表明：在相同敷设方式下，电缆以三线双极式运行时的直流载流量最大，而以单极式运行时的直流载流量最小；10 kV交流电缆在3种敷设方式和3种直流拓扑结构下的直流电压等级均可取10 kV，且留有一定的电压裕度；电缆在沟槽敷设和单极式运行条件下的最大直流输送功率最大，为13.2 MW，而在排管敷设和双极式运行条件下的最大直流输送功率最小，为8.7 MW；当交流电缆改为直流运行后，最大输送功率将会有较大的提升.
Abstract: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.
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Key words:
- XLPE cable /
- DC topology /
- cable laying /
- DC power transmission /
- numerical simulation
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图 1 3种敷设方式下的结构模型示意
Figure 1. Schematic of structural models in three different laying modes
图 2 不同直流拓扑结构和敷设方式的载流量
Figure 2. DC ampacity under different DC operation topologies and laying modes
图 3 电缆在排管敷设和沟槽敷设方式下以双极式直流运行并通入载流量时的流场分布
Figure 3. Flow field distribution during cables in pipeline and trench operating in bipolar DC mode
图 4 不同绝缘温差下的绝缘层电场分布
Figure 4. Electric field distribution of insulating layer under different insulation temperature differences
图 5 不同直流运行条件下的绝缘层电场分布
Figure 5. Electric field distribution of insulating layer in different DC operating conditions
图 6 不同直流电压下的绝缘层最大场强
Figure 6. Maximum field intensity of insulating layer under different DC voltages
图 7 电缆在不同运行条件下加载10 kV直流电压时的绝缘层电场分布
Figure 7. Insulation electric field of cable under 10 kV DC voltage in different operation conditions
图 8 绝缘层内外表面的场强随时间变化
Figure 8. Time distribution of electric field intensity in inner and outer surfaces of insulating layer
图 9 不同直流运行条件下的最大直流输送功率
Figure 9. Maximum DC transmission power in different DC operating conditions
表 1 电缆在排管敷设和沟槽敷设方式下以双极式直流运行时的最大散热功率
Table 1. Maximum heat dissipation power of the cable in the pipeline and trench operating in bipolar DC mode
W 敷设方式 散热方式 热传导 热对流 热辐射 排管敷设 23.26 18.78 21.53 沟槽敷设 25.23 57.38 48.24 
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表 2 不同直流运行条件下的最大直流运行电压
Table 2. Maximum DC operation voltages in different DC operating conditions
kV 敷设方式 直流拓扑结构 单极式 双极式 TWBS 直埋敷设 10.7 11.1 10.7 排管敷设 10.5 10.8 10.5 沟槽敷设 11.0 11.3 11.0
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