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Prioritization of Microgrid Parameters Considering Uncertainties for Use in Protection Studies
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Abbas Saberi Noughabi *1   , Saeed Yeganehfar1 |
| 1- University of Birjand |
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Abstract: (88 Views) |
The wide variations in fault current magnitude under different operating conditions pose serious challenges to conventional overcurrent protection in microgrid. Considering various uncertainties, conventional overcurrent protection based on standard characteristics, loses its coordination. One solution to this problem is to select a parameter other than current for fault detection and use it in the characteristic curve of microgrid relays. This selection requires studying the intrinsic behavior of measurable parameters at the location of primary and backup relays under various uncertainties and with considering different fault conditions in the microgrid. In this paper, three indices are proposed for selecting the best measurable parameter to be used in the characteristic curve of microgrid relays. These indices determine the impact of each uncertainty on the measurable parameters. The uncertainties considered in this paper include the outage of distributed generation sources, islanding, change in the impedance of the upstream network, change in fault type and fault resistance magnitude. The proposed indices include the Mean Square Error (MSE) index, the index for examining the possibility of the occurrence of coordination constraint violation and the index of minimum difference between the distance of the primary and backup relay curves in the post-uncertainty structure compared to the distance between these curves in the base structure. After calculating the indices, to compare the parameters for selecting the better ones, they are prioritized using the proposed Borda and Weighted Borda comparison methods. The main feature of these comparison methods is that the comparison is performed for each uncertainty separately and in a pairwise manner between the studied parameters. Using sensitivity analysis studies and simulations on the IEEE 14-bus distribution network considered as a microgrid, the effectiveness of the proposed indices and comparison methods has been proven, and the parameters have been prioritized for fault detection and use in the characteristic curve of the mentioned microgrid relays. |
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| Keywords: Microgrid, Uncertainty, Microgrid Parameter Prioritization, Borda Method, Weighted Borda Method, Standardization, Distributed Generation (DG), Fault detection. |
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Type of Study: Research |
Received: 2024/11/13 | Accepted: 2025/07/7 | Published: 2025/08/10
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