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Energies 2018, 11(2), 308; doi:10.3390/en11020308

Adaptive Protection System for Microgrids Based on a Robust Optimization Strategy

Energy Center, Department of Electrical Engineering, Faculty of Mathematical and Physical Sciences, University of Chile, 8370451 Santiago, Chile
Electric Power and Energy Research Laboratory (EPER-Lab), School of Electrical Engineering, University of Costa Rica, 11501 San José, Costa Rica
Author to whom correspondence should be addressed.
Received: 14 December 2017 / Revised: 20 January 2018 / Accepted: 25 January 2018 / Published: 1 February 2018
(This article belongs to the Section Electrical Power and Energy System)
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The development of a proper protection system is essential for the secure and reliable operation of microgrids. In this paper, a novel adaptive protection system for microgrids is presented. The protection scheme is based on a protective device that includes two directional elements which are operating in an interleaved manner, namely overcurrent and undervoltage elements. The proposed protection scheme can be implemented in microprocessor-based relays. To define the settings of the protective device, a robust programming approach was proposed considering a finite set of fault scenarios. The scenarios are generated based on the predictions about the available energy and the demand. For each decision step, a robust optimization problem is solved online, which is based on forecasting with a confidence band to represent the uncertainty. The system is tested and compared using real data sets from an existing microgrid in northern Chile. To assess the performance of the proposed protection system, fault scenarios not considered in the optimization were taken into account. The results obtained show that the proposed protective device is able to manage those failure scenarios, as well as those included in the tuning of the settings. Practical considerations are also discussed. View Full-Text
Keywords: microgrid; optimization; power system fault; power system protection; distributed power generation microgrid; optimization; power system fault; power system protection; distributed power generation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Núñez-Mata, O.; Palma-Behnke, R.; Valencia, F.; Mendoza-Araya, P.; Jiménez-Estévez, G. Adaptive Protection System for Microgrids Based on a Robust Optimization Strategy. Energies 2018, 11, 308.

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