scholarly journals A new fast-acting backup protection strategy for embedded MVDC links in future distribution networks

2020 ◽  
pp. 1-1 ◽  
Author(s):  
Lewis Hunter ◽  
Campbell David Booth ◽  
Agusti Egea-Alvarez ◽  
Adam Dysko ◽  
Stephen Finney ◽  
...  
Keyword(s):  
Distribution Networks ◽  
Backup Protection ◽  
Protection Strategy ◽  
Fast Acting

scholarly journals A New Differential Backup Protection Strategy for Smart Distribution Networks: A Fast and Reliable Approach

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 38135-38145 ◽  
Author(s):  
Wenguo Li ◽  
Yi Tan ◽  
Yong Li ◽  
Yijia Cao ◽  
Chun Chen ◽  
...  
Keyword(s):  
Distribution Networks ◽  
Backup Protection ◽  
Protection Strategy

scholarly journals Circuit Breaker Failure Protection Strategy for HVDC Grids

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4326
Author(s):  
María José Pérez-Molina ◽  
Dunixe Marene Larruskain ◽  
Pablo Eguia ◽  
Oihane Abarrategi
Keyword(s):  
High Resistance ◽  
Communication Channel ◽  
Circuit Breaker ◽  
Protection System ◽  
Reliable Operation ◽  
Backup Protection ◽  
Protection Strategy

HVDC grids demand the fast and reliable operation of the protection system. The failure of any protection element should initialize a backup protection almost immediately in order to assure the system’s stability. This paper proposes a novel backup strategy that covers the failure of the primary protection including the malfunctioning of the HVDC circuit breaker. Only local voltage measurements are employed in the proposed backup protection and the voltage derivative is calculated at both sides of the limiting inductor. Consequently, the speed and reliability of the protection system are enhanced, since no communication channel is needed. This paper contains a thorough specification of the proposed protection strategy. This strategy is validated in a four-terminal HVDC grid with various fault case scenarios, including high-resistance fault cases. The operation of the backup protection is reliable and remarkably fast.

scholarly journals Application of synchronized phasor measurements in RPA devices of distribution networks

2021 ◽  
Vol 288 ◽  
pp. 01014
Author(s):  
Sergey A. Piskunov ◽  
Alexey V. Mokeev ◽  
Evgeniy I. Khromtsov
Keyword(s):  
Single Phase ◽  
Distribution Networks ◽  
Cable Line ◽  
Cable Networks ◽  
Phasor Measurements ◽  
Step Down ◽  
The Stability ◽  
Isolated Neutral ◽  
Virtual Modeling ◽  
Fast Acting

The paper discusses the efficiency of RPA devices application with support of synchronized phasor measurements (SPM) at the step-down substations and in 6-20 kV distribution networks. The main part of the paper presents a description of the algorithm developed by the authors for determining the damaged cable line during single-phase ground faults (SGF) in 6-20 kV distribution networks with compensated and isolated neutral. The proposed algorithm makes it possible to realize reliable, fast-acting, and selective SGF protection in distribution cable networks acting either on a signal or on a trip. Based on the SGF protection using SPM, an SGF localization system can be created. This makes it easier to find a damaged cable line in the distribution network. The report presents the conditions for the application of this algorithm, which ensure the stability and reliability of its operation under various parameters of the network. The paper authors propose options for improving the SGF protection algorithm, which allows expanding the field of its application. The results of virtual modeling confirm the effectiveness of SGF protection based on the SPM using the developed algorithm. The final part of the paper contains examples demonstrating other areas of SPM application for RPA devices of step-down transformers, substations, cable distribution networks.

scholarly journals An Adaptive and Decentralized Protection Scheme for Microgrid Protection

2019 ◽  
Author(s):  
Mahdi Ghotbi Maleki ◽  
Hamid Javadi ◽  
Mojtaba Khederzadeh ◽  
Siamak Farajzadeh
Keyword(s):  
Short Circuit ◽  
Characteristic Curve ◽  
Short Circuit Current ◽  
Distribution Networks ◽  
The Other ◽  
Central Unit ◽  
Backup Protection ◽  
Protection Scheme ◽  
Distributed Generators ◽  
Overcurrent Relays

In this paper a protection scheme is provided to protect microgrid by considering the problems that are generated by addition of distributed generators to distribution networks and change these networks from passive to active. At first, changes in microgrid conditions that can affect short-circuit current is explained. Then Based on these changes, an algorithm is proposed to update relays settings. The algorithm can be used for both instantaneous and inverse time relays. In this protection scheme, central unit has no place and relays are responsible for monitoring microgrid and update their settings. In other words, this protection scheme is an adaptive and decentralized microgrid protection scheme. Instantaneous overcurrent relays are used in this paper. To avoid storing large amounts of setting data in relays memory, a method for calculating pickup current of instantaneous relay is provided. Since digital relays used, a new characteristic curve for instantaneous relay for better performance in the field of backup protection is defined. This new characteristic curve has two peakup currents: one of them for main protection and the other one for backup protection. Then coordination of instantaneous relay using the new characteristic curve is explained. At the end, this protection scheme is implemented on a microgrid.

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