A Hierarchical Restoration Mechanism for Distribution Networks Considering Multiple Faults

Juan Wen,Siyu Lin,Xing Qu,Lin Jiang,Zhiwen Chen

doi:10.1155/2022/8787262

Juan Wen, Siyu Lin + Show 3 more

Open Access

https://doi.org/10.1155/2022/8787262

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Abstract

Service restoration of distribution networks in contingency situations is one of the highly investigated and challenging problems. In the conventional service restoration method, utilities reconfigure the topological structure of the distribution networks to supply the consumer load demands. However, the advancements in renewable distributed generations define a new dimension for developing service restoration methodologies. This paper proposes a hierarchical service restoration mechanism for distribution networks in the presence of distributed generations and multiple faults. The service restoration problem is modeled as a complicated and hierarchical program. The objectives are to achieve the maximization of loads restored with minimization of switch operations while simultaneously satisfying grid operational constraints and ensuring a radial operation configuration. We present the service restoration mechanism, which includes the dynamic topology analysis, matching isolated islands with renewable distributed generations, network reconfiguration, and network optimization. A new code scheme that avoids feasible solutions is applied to generate candidate solutions to reduce the computational burden. We evaluate the proposed mechanism on the IEEE 33 and 69 systems and report on the collected results under multitype fault cases. The results demonstrate the importance of the available renewable distributed generations in the proposed mechanism. Moreover, simulation results verify that the proposed mechanism can obtain reasonable service restoration plans to achieve the maximization of loads restored and minimization of switching operations under different faults.

Highlights

Forced and scheduled outages are inevitable in distribution networks due to a wide variety of possible causes, such as bad weather conditions, equipment failure, intentional cyberattacks, and other threats [1]. e damage caused by supply interruption results in serious consequences. e recent largest historical blackout is the India blackout which has affected over 300 million people [2]. e main reason for the incident is circuit breaker tripping
We propose a hierarchical service restoration mechanism that provides a feasible switches sequence for fault restoration of distribution networks. e main contributions of the paper are summarized as follows: (1) e SR problem of the DN is modeled as a hierarchical restoration problem, at the maximization of out-of-service load restoration and the use of renewable distributed generation (RDG) with accounting for the minimization number of switch operations
Simulation Results and Discussion is section presents the application of the proposed restoration mechanism for the SR problem

Summary

Introduction

Forced and scheduled outages are inevitable in distribution networks due to a wide variety of possible causes, such as bad weather conditions, equipment failure, intentional cyberattacks, and other threats [1]. e damage caused by supply interruption results in serious consequences. e recent largest historical blackout is the India blackout which has affected over 300 million people [2]. e main reason for the incident is circuit breaker tripping. E main reason for the incident is circuit breaker tripping In such an incidence, performing effective and timely service restoration (SR) in a distribution network (DN) has become a major concern for utilities. E common practice of the SR problem is to transfer deenergized loads in the out-of-service areas via network reconfiguration. An effective and reasonable SR plan should include switches operation sequence and RDG dispatching that the decision-maker can be followed to restore the affected loads. E aim of the SR plan is to restore the healthy loads in the out-of-service area [3]. In order to achieve this goal, one action is to transfer the deenergized loads to healthy neighboring feeders by altering the open/close status of sectionalizing and tie switches [4]

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Results

Conclusion