Investigate dynamic and transient characteristics of microgrid operation and develop a fast-scalable-adaptable algorithm for fault protection system

Bùi, Dương Minh; Lien, Keng-Yu; Chen, Shilin; Ying-chen, LU; Chan, Chen-Min; Chang, Yung‐Ruei

doi:10.1016/j.epsr.2014.04.003

Cited by 37 publications

(13 citation statements)

References 5 publications

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“…The second is an overload protection scheme. The work in [59] proposed a protection system that aims to improve microgrid reliability and adaptability operation. This scheme used parameters of voltage, current and angle phase with communication links to protect the microgrid.…”

Section: Overcurrent Protection Schemementioning

confidence: 99%

Review of microgrid protection strategies: current status and future prospects

2022

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Section: Overcurrent Protection Schemementioning

confidence: 99%

Review of microgrid protection strategies: current status and future prospects

2022

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“…For example, rotating-based distributed generators (RBDGs) can contribute high fault currents whereas inverter-based distributed generators (IBDGs) can only inject the limited fault currents about 1.2~2.0 p.u. to a distribution network [1][2][3]. Moreover, high penetration of DGs may lead to a magnitude decrease in fault-currents contributed from the utility, which can reduce the sensitivity and selectivity of OCRs on feeders of the distribution network [4][5][6][7][8].…”

Section: Introduction 1motivation and Assumptionmentioning

confidence: 99%

An Adaptive and Scalable Protection Coordination System of Overcurrent Relays in Distributed-Generator-Integrated Distribution Networks

Bùi

Nguyễn

et al. 2021

Applied Sciences

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Integration of distributed generators (DGs) into a distribution network (DN) can cause coordination challenges of overcurrent relays (OCRs) because of different fault-current contributions of DGs as well as the directional change in fault currents. Therefore, the OCRs should be properly coordinated to maintain their adaptability and scalability to protect the DG-integrated distribution network. In this study, an adaptive and scalable protection coordination (ASPC) approach has been developed for the OCRs in a DG-contained distribution network based on two implementation stages. At the first stage, the reliability improvement of fault-current calculation results is performed by determining the min-max confidence interval of fault current for each different fault type, which is the basis for properly selecting tripping and pick-up thresholds of definite-time and inverse-time OC functions in the same OCR. At the second stage, optimization algorithms are used for calculating protection-curve coefficients and Time-Dial Setting (TDS) multiplier for the inverse-time OC functions in the OCR. A real 22 kV DG-integrated distribution network which is simulated by ETAP software is considered a reliable test-bed to validate the proposed ASPC system of OCRs in the multiple-DG-contained distribution network. In addition, the coordination results of OCRs can be obtained by three common optimization algorithms, Particle Swarm Optimization (PSO), Gravitational Search Algorithm (GSA), and Genetic Algorithm (GA). These relay coordination results have shown an effective protection combination of the definite-time OC functions (50P and 50G) and the inverse-time OC functions (51P and 51G) in the same OCR to get the adaptable and scalable DN protection system.

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“…Indeed, the isolated mode operation appears the most challenging to solve, due to the absence of a bulk power system [5]. On the one hand, at a grid-connected microgrid, directional overcurrent protection solutions can be applied [6]. On the other hand, in an isolated microgrid, the directional overcurrent protective devices might not be sufficient, due to the possible reduced fault current magnitudes [7].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Protection System for Microgrids Based on a Robust Optimization Strategy

et al. 2018

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Abstract: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.

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Investigate dynamic and transient characteristics of microgrid operation and develop a fast-scalable-adaptable algorithm for fault protection system

Cited by 37 publications

References 5 publications

Review of microgrid protection strategies: current status and future prospects

Review of microgrid protection strategies: current status and future prospects

An Adaptive and Scalable Protection Coordination System of Overcurrent Relays in Distributed-Generator-Integrated Distribution Networks

Adaptive Protection System for Microgrids Based on a Robust Optimization Strategy

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