Protection of AC and DC microgrids: Challenges, solutions and future trends

Beheshtaein, Siavash; Savaghebi, Mehdi; Vasquez, Juan C.; Guerrero, Josep M.

doi:10.1109/iecon.2015.7392927

Cited by 53 publications

(36 citation statements)

References 58 publications

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“…So, mentioned below are the key extracts for the futuristic approach in AC/DC microgrid environment for a smart and intelligent system with safe, secure, and uninterrupted power flow. Cost‐effective communication channel with efficient communication infrastructure Energy‐efficiency enhancement through an advanced communication system with smart relaying methods and coordinated multipoint algorithms The utilization of linked communication technologies like optical wireless Self‐healing capability should make adequate for a hybrid environment Advanced algorithms for compelling current to zero before it is interrupted by CBs Robust AC/DC interface should be designed. Limitation of SCC should be taken care of. Smooth conversion between microgrid mode of operations. …”

Section: Discussion and Future Trendsmentioning

confidence: 99%

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

2020

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Summary The integration of distributed energy resources (DERs) with conventional systems emerges as an intelligent solution for providing uninterrupted and secure power even at times of high load demand. Better load management with a mature fault handling mechanism makes AC a viable option which has an efficiency of 78.24%. In contrast with less power loss and slightly better efficiency of 84.6%, DC microgrid is a reliable option in a low power environment. In order to accommodate all operating conditions and load types, a hybrid system can be designed with a theoretical efficiency of more than 90%. Bidirectional power flows, low inertia, the transition between different modes of operations are the challenges for the protection of alternating current (AC) and direct current (DC) microgrid systems. Power balance fluctuation, absence of zero‐crossing currents, selection of suitable grounding, and coordination between different rating devices restrict the hybrid system to achieve the said efficiency constantly. This paper reviews in detail of existing protection along with grid‐connected algorithms for both modes of operation. Finally, the limitation, major hurdles, and future course of action for a reliable, efficient, and secure hybrid grid system are figured out.

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Section: Discussion and Future Trendsmentioning

confidence: 99%

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

2020

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“…When there is a variation in system topology, the relays automatically update their values from the database of stored values [50] [51]. A conceptual model of adaptive relaying is shown in Figure 15.…”

Section: Adaptive Protectionmentioning

confidence: 99%

Protection of Distributed Generation: Challenges and Solutions

Shahzad¹,

Kahrobaee²,

Asgarpoor³

2017

EPE

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Distributed generation (DG) is the future of energy. This technology allows the bidirectional flow of power within an electrical network. Researchers are faced with many challenges to the accurate implementation of protection schemes for DG-connected distribution network. The schemes designed must satisfy the performance requirements of selectivity, reliability, and sensitivity. Most researchers opine that conventional protection schemes based on over current detection are insufficient to completely and accurately protect a DG-connected distributed power system. There are many challenges that need to be tackled before embarking upon the journey to successfully implement these schemes. This paper summarizes the major challenges which one can encounter while designing protection schemes for DG-connected distribution networks. Some possible solutions from the literature are also mentioned. Moreover, a suggested solution for protecting future active distribution networks is provided. It is expected that this paper will act as a benchmark for future researchers in this field to tackle the challenges related to the protection of active distribution networks.

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“…In addition to recloser-fuse protection, overcurrent relaying is one of the most common approaches used in radial and meshed power networks, due to simplicity and low cost. However, high penetration of DGs could have adverse effects on the coordination of recloser-fuse and overcurrent relay approaches [8]. Distance protection, which measures impedance from the relay to the fault, will have a low selectivity in a microgrid with a high penetration of DGs.…”

Section: Introductionmentioning

confidence: 99%

Fault location in microgrids: a communication‐based high‐frequency impedance approach

Beheshtaein¹,

Cuzner

Savaghebi³

et al. 2019

IET gener. transm. distrib.

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This paper proposes a novel method to locate faults in an AC meshed microgrid. To this end, a set of features is first extracted and selected from the measured signals and fed to a Support Vector Machine (SVM) to detect the occurrence of fault. Then, the Distributed Generator (DG) with the lowest amount of fundamental voltage, which is the closest one to the fault, injects an appropriate voltage/current harmonic. As the faulted section has the lowest impedance value from the PCC of the DG, the harmonic current of the corresponding line has the highest value. Based on this fact, the first candidate DG sends a notification signal to the second candidate DG, which the fault occurs between them. Finally, the impedances in the injected frequency are measured from these two DGs and fed into a multi-class SVM to locate the faulted line. The proposed method has the ability to locate faults for islanded and grid-connected microgrids with variable configurations. Real-time simulation results are taken by OPAL-RT to show the effectiveness of the proposed method in the meshed microgrid.

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Protection of AC and DC microgrids: Challenges, solutions and future trends

Cited by 53 publications

References 58 publications

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

Protection of Distributed Generation: Challenges and Solutions

Fault location in microgrids: a communication‐based high‐frequency impedance approach

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