Analysis and Design of the Protection Scheme for a LVDC Microgrid

Lazzari, Riccardo; Piegari, Luigi

doi:10.1109/iccep.2019.8890189

Cited by 2 publications

(4 citation statements)

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“…A new protection scheme completely decentralized is proposed in this paper. Te proposed protection scheme is compared with the centralized scheme of [26], that resorting to all the DC grid information determines the fault location and allows the isolation of the faulty feeder. On the contrary, the proposed protection scheme does not need any information exchange among the converters and the protection devices and can be used as a backup system to improve the reliability of the system.…”

Section: Discussionmentioning

confidence: 99%

“…In this situation, it is essential to develop a well-designed protection scheme. Lazzari and Piegari proposed a centralized controller to coordinate the intervention of the converters and the HCBs installed in the grid for ensuring protection from a pole-to-pole short circuit in a low-voltage dc grid [26]. Tis control strategy allows fast fault-clearing time and selectivity, but due to its centralized structure, it must be updated at any new installation of RESs or any time the grid topology changes.…”

Section: Introductionmentioning

confidence: 99%

“…Starting from the results of this analysis performed through an LVDC benchmark, the protection devices' positioning is evaluated by considering the installation of both MCBs and HCBs. Finally, a completely decentralized control strategy is proposed, and it is compared with the one of [26] using numerical simulations of pole-to-pole faults on dc test microgrids. From the comparison, it is shown that the performances of the proposed decentralized controller are comparable with the performances of the centralized one.…”

Section: Introductionmentioning

confidence: 99%

“…Section 3 addresses the efect of a short-circuit incident in an LVDC microgrid to individuate the placement of the HCBs and MCBs. In Section 4, the centralized protection scheme of [26] is recalled, the new decentralized controller is proposed, and fnally, these two schemes are verifed and then compared resorting to simulations. Finally, some conclusions are given in Section 5.…”

Section: Introductionmentioning

confidence: 99%

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Short-Circuit Protection Schemes for LVDC Microgrids Based on the Combination of Hybrid Circuit Breakers and Mechanical Breakers

Lazzari¹,

Piegari

2023

International Transactions on Electrical Energy Systems

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In recent years, low-voltage direct current (LVDC) microgrids are becoming more attractive because they represent a solution to integrate renewable sources, storage, and electronic loads bringing some advantages in comparison with traditional AC grids. However, the protection of such a network involves many challenges, especially in the case of LVDC microgrids with more than one feeder and multiple energy sources. Indeed, the traditional protection breakers used for an AC grid cannot isolate the faults and protect the components of a DC grid, while the use of solid-state circuit breakers increases energy losses. This paper deals with the analysis and design of the protection schemes for LVDC microgrids through the combination of mechanical circuit breakers and hybrid circuit breakers. This solution has the advantage of energy loss reduction but introduces further issues due to the slow transition times of the mechanical circuit breakers. Thus, a completely decentralized control system capable of overcoming the fast fault-clearing time, cost-effectiveness, and selectivity issues is designed to protect from pole-to-pole faults. The proposed control strategy is compared with a centralized protection scheme available in the literature through numerical simulation. The two algorithms show similar performances, with a mean voltage dip duration of less than 30 ms and a maximum voltage dip duration of about 100 ms in the most severe fault condition, but the proposed solution is more reliable and flexible since it does not depend on the communication system.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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