Mitigating low fault current in microgrids through renewables-battery hybrid units

Bawayan, Haneen; Younis, Mohamed

doi:10.1016/j.ijepes.2022.108611

Cited by 4 publications

(1 citation statement)

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“…a fault condition, ESD is performed regardless of which switch (𝑆 1 ) is on or (𝑆 2 ) is off (buck mode) to store excess power in the DC link to keep the DC link balanced and return it when needed[49]. The bidirectional DC/DC converter's dynamic average model's mathematical formulae are as follows.…”

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confidence: 99%

Consolidation of LVFRT capabilities of microgrids using energy storage devices

Moheb

El-Hay

El‐Fergany

2023

Preprint

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The integration of microgrids (MGs) along the distribution networks may improve their performance and reliability. However, it is required to improve the low voltage (LV) fault-ride-through (FRT) i.e. LVFRT ability to deter abrupt disconnecting from the grid during LV events in faulty conditions. In this study, a control strategy for energy storage elements (ESDs) which includes batteries and supercapacitors is proposed to enhance FRT under balanced and unbalanced faults. The MG comprises wind farms and/or photovoltaic arrays. Based on the dynamic simulations using MATLAB/SIMULINK, the ESDs can enhance FRT capability. A comparison of the conventional crowbar scheme and ESDs is realized, and the latter has a better performance than the former in retaining the DC link voltage within satisfactory bounds. At an advanced stage of this effort, the coot bird optimizer (CBO) is applied to generate the best gains of bi-directional converter PI-controller and the ESDs ratings to have minimum ripples in the DC bus voltage and to boost the LVFRT capability of the MGs. The viability of the proposed method based on the CBO’s results is indicated with further validations under different operating scenarios.

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confidence: 99%