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Optimal Service Restoration and Adaptive Switching of Tie Switches Method of Distributed Self-healing Control in Distribution Systems

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Abstract

Because the distribution networks distribute electric energy to customers, has many equipment, a wide range and complex network structure, various failures are prone to occur. Rapid failure self-healing is the key means to improve the reliability of power supply in distribution network. This paper proposes a method for fast service restoration of out-of-service areas without failures based on peer-to-peer (P2P) communication of intelligent terminals. It uses distributed intelligent terminal units as the algorithm carrier and a P2P communication network composed of loop Ethernet. It can accurately distinguish the normal state and the failure state based on the generalized Kirchhoff Current Law setting and realize the failure location and isolation without the delay setting problem of the three-stage current protection. In order to verify its effectiveness, a 0.4 kV dynamic simulation model was developed, and scenarios including different types of switches and different topologies are established. The experimental results show that, unlike other algorithms, such as building a convex model, then, using various intelligent algorithms to solve it, the proposed method can complete the load transfer more quickly, whether switches are all circuit breakers, or partly circuit breakers and partly load switches. In the former case, service restoration can be completed within 2.4 s, faster than other centralized or distributed methods, even when the failure occurs in the worst point, as is shown in the results of test scenario 1. In addition, in the latter case, service restoration can be achieved at least within 4.2 s.

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Abbreviations

DITU:

Distributed intelligent terminal unit

DR1–DR9 :

Differential protection loop

KCL:

Kirchhoff Current Law

OSAWF:

Out-of-service areas without failures

H1–H8 :

Outdoor ring main unit

S1–S8 :

Sectionalizing switch

CB1–CB2 :

Outlet circuit breaker

K1–K4 :

Branch switch

F:

Short circuit failure

P2P:

Peer-to-peer

i x and i y :

The currents flowing through the DITU on the x side and the y side of the line respectively

Imax :

The maximum current allowed by the first switch of the feeder

I new :

The current value flowing through the switches updated every five minutes

i 1–i n :

Second harmonic content of the line current

i s.set :

The differential current action setting value

I s.set :

Current flowing through each switch

i a and i b :

The currents flowing through the DITU on side a and the DITU on side b of the line respectively

i Amax :

The maximum allowable current of substation A

i Bmax :

The maximum allowable current of substation B

U 1 :

The voltage value at the connection switch S7

U 2 :

The voltage value at the connection switch S15

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Acknowledgements

The authors gratefully acknowledge the support of National Natural Science Foundation of China (52007009); 2021 Hunan Province Graduate Student Innovation Project (CX20210794); Hunan Natural Science and Technology Fund Project (No. 2020JJ5574); Outstanding Youth Project of Hunan Provincial Department of Education (No. 19B003); National Outstanding Youth Science Fund Project of National Natural Science Foundation of Hunan Provincial Education Department (No. 19B002).

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Authors and Affiliations

  1. School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha, 410114, China

    Chun Chen, ShengPeng Liu & Yijia Cao

  2. Yunnan Power Grid Co., Ltd, China Suthern Power Grid, Kunming, 650000, China

    Liangxing Tang

  3. College of Electrical and Information Engineering, Hunan University, Changsha, 410082, China

    Yong Li

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  1. Chun Chen
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Correspondence to Chun Chen.

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Chen, C., Liu, S., Cao, Y. et al. Optimal Service Restoration and Adaptive Switching of Tie Switches Method of Distributed Self-healing Control in Distribution Systems. J. Electr. Eng. Technol. 18, 3457–3473 (2023). https://doi.org/10.1007/s42835-023-01463-6

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