A Fully Decentralized Multi-Agent Fault Location and Isolation for Distribution Networks With DGs

Wenguo Li,Lincheng Zhang,Yaqi Deng,Saiwen Zhang,Jiasheng Li,Yong Li,Mingmin Zhang,Qiuxiang Zhu

doi:10.1109/access.2021.3058308

Wenguo Li, Lincheng Zhang + Show 6 more

Open Access

https://doi.org/10.1109/access.2021.3058308

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Abstract

The modern distribution automation suggests to enable decentralized self-healing of distribution networks using advance metering and controlling infrastructure. Decentralized fault location and isolation, as an essential and vital component of self-healing, has attracted considerable attention over the years. In this paper, an integrated fault location and isolation strategy based on fully decentralized multi-agents system (FDMAS) is presented for distribution system with distributed generators (DGs) by combining the primary protection with device failure protection (i.e., backup protection). The proposed FDMAS strategy can locate and isolate electrical fault rapidly even under device failures with minimum fault clearance time and range by using expert logical rules, meanwhile can detect and identify device failure adaptively. Furthermore, a unified programming framework is developed for generalization and application of the proposed strategy. The simulation studies are carried out on 22-bus distribution system by using dynamic model test platform. The test results show that the proposed strategy has an excellent performance on fault clearance time, fault isolation range and device failure detection.

Highlights

CONTRIBUTIONS To address such drawbacks, this study introduces an integrated fully decentralized multiagents system (FDMAS) strategy of fault location and isolation for distribution network with distributed generators (DGs) by combining primary protection with
An integrated primary and backup protection strategy based on FDMAS is presented which is composed of an expert logical rules-based fault location algorithm, primary fault isolation algorithm, backup fault isolation algorithm and a unified programming framework
Backup protection under CT failure: If a backup agent locates the fault in its backup protection zone (BPZ) and the agent itself and its neighbors in its BPZ fail to locate the fault in their primary protection zone (PPZ) by their primary protections, the agent determines that a CT fails in its BPZ and trips its backup CBs to isolate the fault by Rule 5, and further detects the failure type of the CT by Rule 6 and reports the failed CT to substation; otherwise, goes to the step

Summary

INTRODUCTION

Though the presented protection scheme can detect and isolate fault rapidly by using fuzzy controller and possesses online backup protection function, it requires hundreds of milliseconds of operation time Another DMAS-based protection strategy is proposed by [32], which is composed of integrated primary and backup fault location and isolation schemes and can be online employed in distribution system with DGs. its handto-hand communication architecture and its device failure detection-based backup protection scheme make it difficult to be combined into integrated self-healing systems of distribution networks with other service restoration methods. C. RESEARCH GAP many MAS-based methods or strategies have been presented in the previous works for fault location and isolation, to the best of our knowledge, several important aspects have not been considered as follows: 1) The majority of previous so-called decentralized methods are based on hybrid centralized-decentralized structures that are suitable for remedial and non-real time control.

THE PROPOSED FDMAS ARCHITECTURE

CASE STUDIES

K19 K20 K21 K22 K23 K24

RESULT

Findings

CONCLUSION