750 kV超高压输电线路对共用走廊并行配电线路三相电压不平衡的影响分析及治理措施*

doi:10.11985/2024.01.033

电气工程学报 ›› 2024, Vol. 19 ›› Issue (1): 308-315.doi: 10.11985/2024.01.033

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750 kV超高压输电线路对共用走廊并行配电线路三相电压不平衡的影响分析及治理措施^*

包艳艳¹(), 刘康¹(), 温定筠²(), 张广东¹(), 丁玉剑³()

1.国网甘肃省电力公司电力科学研究院兰州 730070
2.国网甘肃省电力公司培训中心兰州 730070
3.中国电力科学研究院有限公司北京 100192

收稿日期:2023-01-30 修回日期:2023-06-30 出版日期:2024-03-25 发布日期:2024-04-25
通讯作者: 包艳艳，女，1990年生，博士研究生。主要研究方向为电网设备状态评估分析。E-mail：1076453621@qq.com
作者简介:刘康，男，1988年生，硕士。主要研究方向为电网设备状态评估分析。E-mail：Liukang@gs.sgcc.com.cn;
温定筠，男，1982年生，硕士。主要研究方向为电网设备状态评估分析。E-mail：wendj@gs.sgcc.com.cn;
张广东，男，1983年生，硕士。主要研究方向为电网设备状态评估分析。E-mail：zhanggd_dky@gs.sgcc.com.cn;
丁玉剑，男，1983年生，硕士。主要研究方向为电网设备状态评估分析。E-mail：dingyj@sgcc.com.cn
基金资助:
国网公司科技资助项目(52272219100A)

Analysis of the Influence of 750 kV Ultra-high Voltage Transmission Line on the Three-phase Voltage Imbalance of Shared Corridor Parallel Distribution Line and Governance Measures

BAO Yanyan¹(), LIU Kang¹(), WEN Dingjun²(), ZHANG Guangdong¹(), DING Yujian³()

1. Power Research Institute, State Grid Gansu Electric Power Company, Lanzhou 730070
2. Training Center, State Grid Gansu Electric Power Company, Lanzhou 730070
3. China Electric Power Research Institute, Beijing 100192

Received:2023-01-30 Revised:2023-06-30 Online:2024-03-25 Published:2024-04-25

摘要/Abstract

摘要：

受750 kV输电线路电磁感应影响，35 kV配电线路并行接近共用走廊的750 kV输电线路时，35 kV配电线路会出现三相电压不平衡问题，严重时会引起35 kV输电线路继电保护装置动作，影响该线路的运行可靠性，目前国内外针对该问题的治理措施报道较少。分析了并行段内不同电压等级导线间的距离、高度、并行长度等参数对35 kV线路三相电压的影响程度，提出了降低35 kV配电线路对地高度并加装屏蔽地线，在35 kV配电线路上加装并联电容器，在35 kV配电线路上加装并联电抗器等保护措施，研究结果表明，采用上述措施可有效改善35 kV配电线路三相电压不平衡问题，提升了配电线路运行可靠性和抵御电磁影响的能力，为750 kV和35 kV线路共用走廊段线路的设计标准制定提供参考方案。

关键词: 电能质量, 共用走廊, 治理措施, 配电线路, 电磁影响

Abstract:

When the 35 kV distribution line runs parallel to the 750 kV ultra-high voltage(UHV) transmission line in the shared corridor, the power quality such as the three-phase voltage imbalance of the 35 kV distribution line will be affected by the strong electromagnetic induction of the 750 kV UHV transmission line. In order to ensure the reliability of the power supply of 35 kV distribution lines and solve the problem of three-phase voltage imbalance in operation, the three-phase voltage imbalance changes under different distances, heights and different lengths of parallel sections between 750 kV ultra-high voltage transmission lines and 35 kV distribution lines are analyzed. Reliable and feasible solutions based on actual conditions are put forward, including reducing the height of 35 kV distribution lines to the ground while installing shielded ground wires, installing parallel capacitors on 35 kV distribution lines, and installing parallel reactors on 35 kV distribution lines. Through these measures, the impact of the 750 kV ultra-high voltage transmission line on the three-phase voltage imbalance of the distribution line during the operation of the shared corridor can be improved, the ability of the distribution line to withstand the influence of the electromagnetic environment is improved, and the reliability and safety of the operation of the distribution line are enhanced. The technical solutions for the operation design and planning of UHV transmission lines and distribution lines in shared corridors are provided.

Key words: Power quality, shared corridors, governance measures, power distribution lines, electromagnetic influences

中图分类号:

TM561

包艳艳, 刘康, 温定筠, 张广东, 丁玉剑. 750 kV超高压输电线路对共用走廊并行配电线路三相电压不平衡的影响分析及治理措施^*[J]. 电气工程学报, 2024, 19(1): 308-315.

BAO Yanyan, LIU Kang, WEN Dingjun, ZHANG Guangdong, DING Yujian. Analysis of the Influence of 750 kV Ultra-high Voltage Transmission Line on the Three-phase Voltage Imbalance of Shared Corridor Parallel Distribution Line and Governance Measures[J]. Journal of Electrical Engineering, 2024, 19(1): 308-315.

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参数	感应电压幅值1/kV		电压幅值2/kV		电压幅值3/kV
电压幅值	A相	11.14	A相	11.14	A相	11.30
	B相	15.71	B相	15.70	B相	15.88
	C相	10.61	C相	10.60	C相	10.77
电压相角	A相	27.93	A相	27.94	A相	25.07
	B相	25.97	B相	25.99	B相	23.66
	C相	26.57	C相	26.58	C相	23.60

线路长度/km	A相电压/kV	B相电压/kV	C相电压/kV
20	20.044	23.408	18.583
25	16.142	18.842	14.977
30	13.585	15.845	12.625
35	11.678	13.647	10.854

超高压输电线路平均对地高度/m	A相电压/ kV	B相电压/ kV	C相电压/ kV
20	14.94	15.95	13.96
24	15.39	16.56	14.51
28	15.31	16.59	14.57

线路之间距离/m	电场强度/(V/m)	磁感应强度/μT
20	3 226.6	1.063 2
24	2 091.1	0.811 9
28	1 478.4	0.662 5

三相对地高度/m	A相电压/kV	B相电压/kV	C相电压/kV
5	2.26	2.07	1.95
6	2.54	2.31	2.18
7	2.81	2.54	2.38
8	3.06	2.76	2.58
9	3.30	2.97	2.77

750 kV超高压输电线路对共用走廊并行配电线路三相电压不平衡的影响分析及治理措施^*

Analysis of the Influence of 750 kV Ultra-high Voltage Transmission Line on the Three-phase Voltage Imbalance of Shared Corridor Parallel Distribution Line and Governance Measures

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电容/μF	A相电压/kV	B相电压/kV	C相电压/kV
0.1	10.736	13.418	9.548
0.5	3.734	5.172	3.034
1	2.050	2.962	1.611
5	0.446	0.677	0.329

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电感/H	A相电压/kV	B相电压/kV	C相电压/kV
1	0.352	0.524	0.292
5	2.524	3.702	2.089
10	5.142	7.697	3.988