不同直流拓扑结构和敷设环境下35 kV交流XLPE电缆直流载流量分析

张添胤; 王启隆; 王新; 金泱; 杨敏; 陈向荣

doi:10.3969/j.issn.0258-2724.20220704

不同直流拓扑结构和敷设环境下35 kV交流XLPE电缆直流载流量分析

doi: 10.3969/j.issn.0258-2724.20220704

张添胤^{1, 2,},
王启隆^{1, 2},
王新³,
金泱³,
杨敏³,
陈向荣^{1, 2, 4, 5, ,}

1.
浙江大学电气工程学院浙江杭州 310027
2.
浙江大学杭州国际科创中心浙江杭州 311200
3.
浙江浙能技术研究院有限公司浙江省火力发电高效节能与污染物控制技术研究重点实验室，浙江杭州 311121
4.
浙江大学浙江省宽禁带功率半导体材料与器件重点实验室浙江杭州 311200
5.
浙江大学先进电气国际研究中心海宁 314400

详细信息

作者简介:
张添胤（2000—），男，博士研究生，研究方向为高压直流输电和电力电缆技术，E-mail：zhangtianyin_zju@163.com

通讯作者:
陈向荣（1982—），男，研究员，研究方向为先进电气材料与高压绝缘测试技术、先进电力装备与新型电力系统、高电压新技术，E-mail：chenxiangrongxh@zju.edu.cn

中图分类号: TM247
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- 文章访问数: 42
- HTML全文浏览量: 20
- PDF下载量: 7
- 被引次数: 0
出版历程
- 收稿日期: 2022-10-19
- 修回日期: 2023-04-17
- 网络出版日期: 2024-08-31

Direct Current Ampacity of 35 kV Alternating Current Cross-Linked Polyethylene Cables under Various Direct Current Topologies and Laying Environments

ZHANG Tianyin^{1, 2
,},
WANG Qilong^{1, 2},
WANG Xin³,
JIN Yang³,
YANG Min³,
CHEN Xiangrong^{1, 2, 4, 5
, ,}

1.
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
2.
ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou 311200, China
3.
Zhejiang Provincial Key Laboratory of High-Efficiency Energy-Saving and Pollutant Control Technology for Thermal Power Generation, Zhejiang Energy Research Institute Co. Ltd., Hangzhou 311121, China
4.
Zhejiang Provincial Key Laboratory of Power Semiconductor Materials and Devices, Zhejiang University, Hangzhou 311200, China
5.
International Research Center for Advanced Electrical Engineering, Zhejiang University, Haining 314400, China

摘要

摘要:
交流电缆改为直流运行对于新能源发电并网以及提高供电容量有着重要意义. 本文以35 kV交流交联聚乙烯(cross-linked polyethylene，XLPE)电缆为研究对象，采用有限元方法对三线双极式、单极式和双极式3种直流拓扑结构下的三芯交流电缆进行温度场仿真；同时考虑配电网中常见的影响因素，如靠近热水管道、电缆集群敷设、电流不平衡等，研究其对交流电缆改为直流运行下的电缆载流量的影响. 研究发现：在相同工作温度下，35 kV交流XLPE电缆在单极式直流拓扑结构下运行时的载流量最小，在三线双极式直流拓扑下运行时的载流量最大；当交流电缆与城市供水管道水平间距为2.0 m，垂直间距为0.5 m时，在上述3种直流拓扑下运行时的载流量下降了约3.0%；在电缆集群敷设时，加载非同步峰值能使载流量最大提升90 A；电缆载流量随电流不平衡度先增大后减小，在不平衡度为0时，电缆载流量达到最大. 研究结果为35 kV交流XLPE电缆的直流改造提供了参考依据.
- XLPE电缆 /
- 直流拓扑 /
- 敷设环境 /
- 直流载流量
Abstract:
Converting alternating current (AC) cables into direct current (DC) operation is of great significance to achieve new energy generation connected to the grid and increase power supply capacity. A 35 kV AC cross-linked polyethylene (XLPE) cable was taken as the research object, and temperature field simulation of the three-core AC cable was carried out through the finite element method under three kinds of DC topologies: three-wire bipole, monopole, and bipole. At the same time, common influencing factors in the distribution network were considered, such as distance from hot water pipes, cable cluster laying, and current imbalance, so as to explore the influence of these factors on the ampacity of the cable when the AC cable was changed to the DC operation. The results show that under the same operating temperature, the 35 kV AC XLPE cable has the smallest ampacity when operating under the monopolar DC topology and the largest ampacity under the three-wire bipolar DC topology. When the horizontal distance between AC cable and urban water supply pipes is 2.0 m, and the vertical distance is 0.5 m, the ampacity of cables operating under the above kinds of DC topologies is reduced by about 3.0%. The maximum ampacity can be increased by 90 A as the asynchronous peak value is loaded when the cable cluster is laid. The cable ampacity increases first and then decreases with increasing current imbalance, and it reaches the maximum value when the current imbalance is 0. The research results can provide some reference for converting 35 kV AC XLPE cables into DC operation.
- XLPE cables /
- DC topologies /
- laying environment /
- DC ampacity

HTML全文

图 1 三相电缆的双极式直流运行方案

Figure 1. Bipolar DC operation scheme of three-phase cables

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图 2 三相电缆的单极式直流运行方案

Figure 2. Monopolar DC operation scheme of three-phase cables

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图 3 三相电缆的TWBS-HVDC直流运行方案

Figure 3. TWBS-HVDC operation scheme of three-phase cables

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图 4 电缆的敷设环境

Figure 4. Laying environment of cable

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图 5 网格剖分

Figure 5. Mesh settings

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图 6 不同直流拓扑和直流负荷的缆芯温度

Figure 6. Cable core temperature under different DC topologies and loads

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图 7 通过210.0 A电流时单极式电缆的温度场分布

Figure 7. Temperature field distribution of monopolar cable at current of 210.0 A

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图 8 通过240.0 A电流时双极式电缆的温度场分布

Figure 8. Temperature field distribution of bipolar cable at current of 240.0 A

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图 9 不同直流拓扑和工作温度的电缆载流量

Figure 9. Cable ampacity under different DC topologies and operating temperatures

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图 10 热水管与电缆的相对位置

Figure 10. Distance from hot water pipe to cable

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图 11 电缆载流量随热水管道和电缆距离的变化

Figure 11. Variation of cable ampacity with distance from hot water pipe to cable

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图 12 集群电缆加载相同直流负荷时的温度场分布

Figure 12. Temperature field distribution of cluster cables under same DC load

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图 13 单根电缆运行时的温度场分布

Figure 13. Temperature field distribution of a single cable in operation

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图 14 集群电缆加载不同负荷时的温度场分布

Figure 14. Temperature field distribution of cluster cables under different loads

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图 15 电缆温度场分布

Figure 15. Temperature field distribution of cable

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图 16 电流不平衡度和三芯电流和之间的关系

Figure 16. Relationship between current unbalance and three-core current sum

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表 1 电缆材料与尺寸参数

Table 1. Cable materials and size parameters

结构名称	材料	厚度/mm	直径/mm
导体	铜		13.0
导体屏蔽层	半导体混合物	0.8	14.6
XLPE屏蔽层	XLPE	10.5	35.6
绝缘屏蔽层	半导体混合物	1.0	37.6
铜屏蔽层	铜	0.2	38.0
包带	聚丙烯	0.4	83.2
内护套	聚氯乙烯	2.0	87.2
铠装层	钢	1.6	90.4
外护套	聚氯乙烯	5.0	100.4

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表 2 电缆材料的物理参数

Table 2. Physical parameters of cable materials

材料	密度/ （kg·m⁻³）	比热容/ （J·（kg·K）⁻¹）	热导率/ （W·（m·K）⁻¹）
铜	8900	380	385.00
XLPE	1200	1000	0.29
聚氯乙烯	1380	1000	0.16
半导电材料	1200	1100	0.28
填充材料	550	1900	0.25
钢	7850	450	45.00

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表 3 热水管道的材料和结构参数

Table 3. Hot water pipe materials and structural parameters

结构名称	材料	厚度/mm	半径/mm
工作区	水		516
保温层	硬质聚氨酯	65	581
外护管	高密度聚乙烯	15	596
螺旋焊缝钢管	钢	14	610

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