Multi-point Synchronous Protection Scheme for Active Distribution Network Based on 5G Communication

doi:10.11930/j.issn.1004-9649.202304099

Abstract

Abstract:

The linear section location method based on remote signaling data does not consider the influence of communication time-delay and reliability, and is only applicable to large current faults and single faults. In this regard, a multi-point synchronous protection scheme for active distribution network based on 5G communication is proposed. Firstly, a section location communication architecture based on 5G communication is established, and its communication time-delay and reliability are analyzed. Secondly, on the basis of analyzing the direction distribution characteristics of the transient zero-sequence current, the switching function is redefined, and a logical relationship location model suitable for small current faults is proposed. Then, using the left-right approximation method, the switching function established according to the logic relationship is linearized, which makes the linearized logic relationship location model not only suitable for single faults, but also for multiple faults. Finally, the proposed protection scheme is validated in an active distribution network with different topologies and 5G communication. The results show that the proposed scheme can not only realize multi-point synchronous protection, but also be applicable to both small current faults and multiple faults.

Key words: active distribution network, synchronous protection, 5G communication, small current fault, multiple faults, transient zero-sequence current

CLC Number:

TM773

Tiecheng LI, Hui FAN, Qian ZANG, Jiangbo REN, Weiming ZHANG, Yibo WANG. Multi-point Synchronous Protection Scheme for Active Distribution Network Based on 5G Communication[J]. Electric Power, 2023, 56(11): 113-120.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202304099

https://www.electricpower.com.cn/EN/Y2023/V56/I11/113

Figures/Tables 11

References 29

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通信过程	类型	通信过程	类型
0→1	误报	1→1	正常
1→0	漏报	0→0	正常

通信过程	类型	通信过程	类型
0→1	误报	1→1	正常
1→0	漏报	0→0	正常

节点	稳态零序电流方向	节点稳态状态编码	暂态零序电流方向	节点暂态状态编码
S1	–	1	–	1
S2	–	1	–	1
S3	–	1	–	1
S4	+	0	+	0
S5	+	0	+	0
S6	–	1	–	1
S7	+	0	+	0

节点	稳态零序电流方向	节点稳态状态编码	暂态零序电流方向	节点暂态状态编码
S1	–	1	–	1
S2	–	1	–	1
S3	–	1	–	1
S4	+	0	+	0
S5	+	0	+	0
S6	–	1	–	1
S7	+	0	+	0

模型	故障线路位置	漏误报节点位置	线路定位结果
本文	2	无漏误报	2
文献[18]	2	无漏误报	无法定位
文献[22]	2	无漏误报	无法定位
本文	5	S2	5
文献[18]	5	S2	无法定位
文献[22]	5	S2	无法定位
本文	6	S4	6
文献[18]	6	S4	无法定位
文献[22]	6	S4	无法定位