基于负序分量的含光伏电源配电网故障区段定位方法

doi:10.11930/j.issn.1004-9649.202307027

中国电力 ›› 2024, Vol. 57 ›› Issue (5): 188-199.DOI: 10.11930/j.issn.1004-9649.202307027

基于负序分量的含光伏电源配电网故障区段定位方法

胡满琳¹(), 李楠²(), 李一鸣¹(), 皮志勇², 朱益¹, 李振兴¹()

1. 三峡大学电气与新能源学院，湖北宜昌　443002
2. 国网湖北省电力有限公司荆门供电公司，湖北荆门　448001

收稿日期:2023-07-10 接受日期:2024-02-05 出版日期:2024-05-28 发布日期:2024-05-16
作者简介:胡满琳（2001—），女，硕士研究生，从事电力系统继电保护与安全稳定控制研究，E-mail：2934504271@qq.com
李楠（1989—），硕士研究生，工程师，从事电力系统新技术研究，E-mail：262756996@qq.com
李一鸣（1999—），男，硕士研究生，从事电力系统继电保护与安全稳定控制研究，E-mail：290940645@qq.com
李振兴（1977—），男，通信作者，博士，教授，从事电力系统保护与控制研究，E-mail：lzx2007001@163.com
基金资助:
国家自然科学基金资助项目（大规模电力外送通道重合闸所致重大风险分析与规避控制策略研究，52077120）。

Fault Location Method for Distribution Network with Photovoltaic Power Based on Negative Sequence Component

Manlin HU¹(), Nan LI²(), Yiming LI¹(), Zhiyong PI², Yi ZHU¹, Zhenxing LI¹()

1. College of Electrical Engineering and New Energy, Three Gorges University, Yichang 443002, China
2. State Grid Hubei Jingmen Electric Power Supply Company, Jingmen 448001, China

Received:2023-07-10 Accepted:2024-02-05 Online:2024-05-28 Published:2024-05-16
Supported by:
This work is supported by National Natural Science Foundation of China (Research on Major Risk Analysis and Control Strategy by Reclosing for Large-Scale Power Transmission Channel, No.52077120)

摘要/Abstract

摘要：

针对光伏电源接入配电网导致故障电流无法正确反映故障区段的问题，分析含光伏电源配电网故障时三序分量，选择负序分量作为故障特征量；对于不对称故障场景提出负序重构方案；采用曼肯德尔（Mann-Kendall，MK）趋势检测寻求故障特征最明显的负序重构序列；利用负序重构电压幅值确定可疑故障区段，结合负序重构电流相位方向确定故障区段。在PSCAD/EMTDC仿真平台搭建含光伏电源的配电网模型。结果表明：提出的方法能够实现含光伏电源配电网在不同故障类型、故障位置下的故障区段准确定位，为含光伏电源配电网快速故障定位提供了理论依据。

关键词: 对称分量法, 故障区段定位, 负序重构, MK检测, 光伏电源

Abstract:

In order to solve the problem that the fault current can not correctly indicate the fault section due to the connection of photovoltaic power to the distribution network, the three-sequence component of the faulty distribution network with photovoltaic power generation is analyzed, and the negative sequence component is selected as the fault characteristic quantity. A negative sequence reconstruction scheme is proposed for the asymmetric fault scenario. The MK trend detection is used to search the negative-sequence reconstruction sequence with the most obvious fault characteristics. The negative sequence reconstruction voltage amplitude is used to determine the suspicious fault section, and the fault section is finally determined by the phase direction of negative sequence reconstruction current. A distribution network model with photovoltaic power generation is established with the PSCAD/EMTDC simulation platform. The results show that the proposed method can accurately locate the fault section of the distribution network with photovoltaic power generation under different fault types and fault locations, and can provide a theoretical basis for the rapid fault location of the distribution network with photovoltaic power generation.

Key words: symmetrical component method, fault location, negative sequence reconstruction, MK detection, photovoltaic power generation

胡满琳, 李楠, 李一鸣, 皮志勇, 朱益, 李振兴. 基于负序分量的含光伏电源配电网故障区段定位方法[J]. 中国电力, 2024, 57(5): 188-199.

Manlin HU, Nan LI, Yiming LI, Zhiyong PI, Yi ZHU, Zhenxing LI. Fault Location Method for Distribution Network with Photovoltaic Power Based on Negative Sequence Component[J]. Electric Power, 2024, 57(5): 188-199.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202307027

https://www.electricpower.com.cn/CN/Y2024/V57/I5/188

图/表 28

图 1 光伏电源接入配电网

Fig.1 Connection of photovoltaic power to distribution network

图 2 K3处故障时正序分量分析

Fig.2 Positive sequence component analysis for fault at K3

图 3 K3处故障时零序分量分析

Fig.3 Zero sequence component analysis for fault at K3

图 4 K3处故障时负序等效网络

Fig.4 Negative sequence equivalent network when K3 is faulty

图 5 K3处故障时负序网络

Fig.5 Negative sequence network when K3 is faulty

表 1 负序重构权重系数取值仿真结果

Table 1 Simulation result with different weight coefficient values of negative sequence reconstruction

K取值	各节点重构负序电压幅值/kV	实际故障区段	定位故障区段
0.8	（2.25、3.75、4.09、4.89、1.891）	（2、3）	（3、4）
0.9	（1.75、2.49、5.13、4.19、3.91）		（3、4）
1.0	（1.29、2.15、3.12、4.89、5.62）		（4、5）
1.1	（3.48、3.95、4.09、2.87、1.57）		（2、3）
1.2	（1.85、3.75、4.09、1.89、0.891）		（2、3）
1.3	（–0.32、1.34、2.44、1.21、–0.46）		（2、3）
1.4	（1.51、4.25、4.67、3.77、3.03）		（2、3）
1.5	（2.66、5.295、5.52、3.96、2.95）		（2、3）
1.6	（5.1、5.86、5.43、2.47、1.12）		（2、3）
1.7	（5.15、6.82、6.49、3.79、2.4）		（2、3）
1.8	（5.7、3.6、2.59、–0.32、1.32）		（1、2）
1.9	（1.77、3.05、4.21、2.37、1.81）		（2、3）
2.0	（3.85、3.75、2.74、2.59、1.1）		（1、2）
2.1	（–2.15、–3.32、–4.74、–5.73、–2.1）		（3、4）
2.2	（3.27、4.56、4.93、5.2、4.17）		（3、4）

图 6 负序重构流程

Fig.6 Negative sequence reconstruction process

图 7 光伏接入配网仿真

Fig.7 Simulation of distribution network integrated with photovoltaic

图 8 上游侧不对称故障K=1.0与K=1.5时MK仿真

Fig.8 MK simulation with upstream asymmetric fault K=1.0 and K=1.5

表 2 上游侧不对称故障时各权重K下的MK仿真结果

Table 2 MK simulation results under different weight K values for upstream asymmetric fault

K	${U_{\text{F}}}_k$绝对值	K	${U_{\text{F}}}_k$绝对值
1.0	4.526	1.6	2.038
1.1	2.038	1.7	2.038
1.2	2.038	1.8	2.038
1.3	2.038	1.9	2.038
1.4	2.038	2.0	2.038
1.5	2.038

图 9 上游侧不对称故障时负序重构电压幅值

Fig.9 The voltage amplitude of negative sequence reconstruction with upstream side asymmetric fault

表 3 上游侧不对称故障$ K $=1.0时的负序仿真结果

Table 3 Negative sequence simulation results with upstream side asymmetric fault $ K $=1.0

测量点	负序电压幅值/kV	负序电流相位正负	测量点	负序电压幅值/kV	负序电流相位正负
1	0.33	负	7	2.60	正
2	1.82	负	8	2.15	正
3	3.30	负	9	1.76	正
4	4.95	负	10	1.47	正
5	4.07	正	11	1.32	正
6	3.27	正	12	1.21	正

图 10 上游侧对称故障$ K $=1.1时的MK仿真

Fig.10 MK simulation with upstream side symmetric fault $ K $=1.1

图 11 上游侧对称故障时负序重构电压幅值

Fig.11 The voltage amplitude of negative sequence reconstruction with upstream side symmetric fault

表 4 上游侧对称故障K=1.1时的负序仿真结果

Table 4 Negative sequence simulation results with upstream side symmetric fault K=1.1

测量点	负序电压幅值/kV	负序电流相位正负	测量点	负序电压幅值/kV	负序电流相位正负
1	0.86	负	7	2.78	正
2	2.26	负	8	2.30	正
3	3.68	负	9	1.89	正
4	5.28	负	10	1.58	正
5	4.34	正	11	1.42	正
6	3.48	正	12	1.32	正

图 12 下游侧不对称故障K=1.0时的MK仿真

Fig.12 MK simulation with downstream side asymmetric fault K=1.0

图 13 下游侧不对称故障时负序重构电压幅值

Fig.13 The voltage amplitude of negative sequence reconstruction with downstream side asymmetric fault

表 5 下游侧不对称故障K=1.0时的负序仿真结果

Table 5 Negative sequence simulation results with downstream side asymmetric fault K=1.0

测量点	负序电压幅值/kV	负序电流相位正负	测量点	负序电压幅值/kV	负序电流相位正负
1	0.11	负	7	1.28	负
2	0.25	负	8	1.57	负
3	0.44	负	9	1.88	负
4	0.65	负	10	2.19	负
5	0.86	负	11	1.98	正
6	1.07	负	12	1.82	正

图 14 下游侧对称故障K=1.2时的MK仿真

Fig.14 MK simulation with downstream side symmetric fault K=1.2

图 15 下游侧对称故障时负序重构电压幅值

Fig.15 Negative sequence reconstruction voltage amplitude with the downstream side symmetric fault

表 6 下游侧对称故障K=1.2时的负序仿真结果

Table 6 Negative sequence simulation results with downstream side symmetric fault K=1.2

测量点	负序电压幅值/kV	负序电流相位正负	测量点	负序电压幅值/kV	负序电流相位正负
1	1.21	负	7	1.09	负
2	0.94	负	8	1.29	负
3	0.79	负	9	1.49	负
4	0.78	负	10	1.69	负
5	0.84	负	11	1.52	正
6	0.95	负	12	1.40	正

图 16 PV不同工况不对称故障K=1.0时的MK仿真

Fig.16 MK simulation with asymmetric fault K=1.0 under different PV working conditions

图 17 PV不同工况不对称故障负序重构电压幅值

Fig.17 Negative sequence reconstruction voltage amplitude with asymmetric fault under different PV working conditions

表 7 PV不同工况上游侧不对称故障K=1.0时负序仿真结果

Table 7 Negative sequence simulation results with upstream side asymmetric faults K=1.0 under different PV working conditions

测量点	负序电压幅值/kV	负序电流相位正负	测量点	负序电压幅值/kV	负序电流相位正负
1	0.33	负	7	2.60	正
2	1.82	负	8	2.16	正
3	3.30	负	9	1.77	正
4	4.95	负	10	1.49	正
5	4.07	正	11	1.34	正
6	3.26	正	12	1.23	正

图 18 DG不同工况对称故障K=1.1时的MK仿真

Fig.18 MK simulation with symmetric fault K=1.1 under different DG working conditions

图 19 DG不同工况对称故障时负序重构电压幅值

Fig.19 Negative sequence reconstruction voltage amplitude with symmetric fault under different DG working conditions

表 8 PV不同工况上游侧对称故障时K=1.1下的负序仿真结果

Table 8 Negative sequence simulation results with upstream side symmetric fault K=1.1 under different PV working conditions

测量点	负序电压幅值/kV	负序电流相位正负	测量点	负序电压幅值/kV	负序电流相位正负
1	0.52	负	7	1.31	正
2	0.49	负	8	1.10	正
3	1.41	负	9	0.92	正
4	2.40	负	10	0.77	正
5	1.99	正	11	0.69	正
6	1.61	正	12	0.62	正

表 9 不同方法性能比较

Table 9 Performance comparison of different methods

方法	解决故障类型	计算量	成本	工程难度	精确度
1	不对称故障	大	低	低	低
2	单相接地故障	小	高	高	高
3	单相接地故障	小	低	低	低
4	单相故障	小	高	低	高
5	全类型故障	小	低	低	高

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基于负序分量的含光伏电源配电网故障区段定位方法

Fault Location Method for Distribution Network with Photovoltaic Power Based on Negative Sequence Component

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基于负序分量的含光伏电源配电网故障区段定位方法

Fault Location Method for Distribution Network with Photovoltaic Power Based on Negative Sequence Component

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摘要/Abstract

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参考文献 25

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