Detailed Dynamic DC Models of VSC Considering Controls for DC-Fault Simulations in Modernized Microgrid Protection

Davari, Masoud; Aghazadeh, Amir; Gao, Weinan; Blaabjerg, Frede

doi:10.1109/jestpe.2020.3036409

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…x ai and x bi represent the values of the first and second selected characteristic parameters, respectively. Then, four of the n sampling data are randomly selected as the initial clustering centres, expressed as in (2).…”

Section: Beginmentioning

confidence: 99%

“…With the rapid development of the smart grid, renewable energy sources and multiple categories of DC loads are increasing while DC storage applications are becoming increasingly widespread [1,2]. The issues of high AC / DC energy conversion loss, relatively poor flexibility and numerous converter links in AC distribution systems become increasingly conspicuous [3].…”

Section: Introductionmentioning

confidence: 99%

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Flexible DC distribution line protection principle based on distance metric of clustering centres

Dai

Liu

Chen

et al. 2022

IET Generation Trans & Dist

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Aiming at the issue of unsatisfactory selectivity of single‐terminal protection, and poor speed and high requirements for data synchronization of double‐terminal protection in flexible DC distribution networks, an artificial intelligence (AI)‐based method is proposed to obtain the best clustering centres through unsupervised clustering analysis of historical data to realize the non‐deterministic flexible DC distribution line protection principle. The method forms historical data samples by simulating different types of short‐circuit faults at different locations of the line in advance, combining them with the actual faults, and collecting and processing the post‐fault currents. The K‐means clustering algorithm is then used to find the best clustering centres corresponding to different fault types, and fault identification and pole selection are realized by comparing the distance between real‐time data and each clustering centre. The process relies merely on single‐terminal current as the characteristic quantity, and it does not need complicated feature extraction and calculation. Thus, the cumbersome threshold setting in conventional current protections can be avoided. Finally, the case studies are carried out in PSCAD/EMTDC, and the results show that the proposed protection has good selectivity and rapidity, and the tolerance to fault resistance is improved compared with the conventional local‐current‐based protections.

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Section: Beginmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexible DC distribution line protection principle based on distance metric of clustering centres

Dai

Liu

Chen

et al. 2022

IET Generation Trans & Dist

View full text Add to dashboard Cite

show abstract

“…Regarding these limitations, fault assessment is often mainly focused on the maximum fault current values that can be generated in the case of a fault to establish the protections settings. This is shown in [23], where the technologies addressing the previously mentioned issues for DC grids protection are explored. However, as demonstrated in [24], when it comes to establishing a protection coordination scheme for a DC smart grid, a more accurate fault current evaluation is needed.…”

Section: Introductionmentioning

confidence: 99%

Innovative Fault Current Evaluation Method for Active DC Grids

Valbuena Godoy,

Negri,

Oliva

et al. 2024

Electronics

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DC smart grids are a promising solution for the efficient integration of renewable energy sources and loads. Still, their widespread adoption is hindered by significant challenges related to fault response, identification, and clearance. The traditional DC fault analysis method is a useful tool for straightforwardly understanding the behaviour of fault current contributions from DC converters in LVDC networks during a fault. However, when a system with multiple converters and non-negligible fault impedance need to be considered, its accuracy is severely limited due to the assumptions included in the problem solution, thus leading to the following: (a) the dependency of the results’ reliability on fault impedance values and/or other converter fault current contributions; (b) the inaccuracy of the diode current estimation; and (c) the inaccuracy of the conductor joule integral. Thus, these results’ data may be unreliable for designing protection systems for one converter or for an entire network. In order to overcome these issues, this paper proposes an innovative, simple numerical approach to DC fault current evaluation, which can be adopted when the number of converters become significant, or the network is complex. This method arises from the primary interest in solving the circuit to extract the indicators (current peak value and time, joule integral, etc.) necessary for designing circuit protections. This approach proved to grant two main advantages over traditional methods: (a) it provides accurate results, with no need to introduce any specific assumption; (b) it can be structured to manage an arbitrary number of converters; and (c) it reduces the computational processing times and resources necessary to simulate an entire DC network in comparison to other circuit solution software.

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Analysis of the Effect of an Active Current Limiter on a DC Circuit Breaker’s Breaking Characteristics

Wang,

Chen,

et al. 2023

2023 7th International Conference on Smart Grid and Smart Cities (ICSGSC)

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Detailed Dynamic DC Models of VSC Considering Controls for DC-Fault Simulations in Modernized Microgrid Protection

Cited by 8 publications

References 28 publications

Flexible DC distribution line protection principle based on distance metric of clustering centres

Flexible DC distribution line protection principle based on distance metric of clustering centres

Innovative Fault Current Evaluation Method for Active DC Grids

Analysis of the Effect of an Active Current Limiter on a DC Circuit Breaker’s Breaking Characteristics

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