A Non-unit Protection Scheme for DC Microgrid Based on Local Measurements

Meghwani, Anju; Srivastava, Suresh C.; Chakrabarti, Saikat

doi:10.1109/tpwrd.2016.2555844

Cited by 276 publications

(108 citation statements)

References 26 publications

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“…The LL faults create very serious harm to the safety of the system, and it has low fault impedance characteristics. On the other hand, the LG faults are the most frequently occurring faults that cause damage by the grounding system type in the DC network . During the selection of the suitable grounding system type, many related factors are taken into account like lessening the stray current, minimization of touch current for enhancing the personal safety, and fault current amplitude .…”

Section: Challenges Towards the Protection Of Microgridmentioning

confidence: 99%

“…On the other hand, the LG faults are the most frequently occurring faults that cause damage by the grounding system type in the DC network. 27,28 During the selection of the suitable grounding system type, many related factors are taken into account like lessening the stray current, minimization of touch current for enhancing the personal safety, and fault current amplitude. 29 The corrosion is the main consequence of stray current, and this forces to design a protection scheme with minimum stray current.…”

Section: Groundingmentioning

confidence: 99%

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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: Challenges Towards the Protection Of Microgridmentioning

confidence: 99%

Section: Groundingmentioning

confidence: 99%

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

2020

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“…Too much communication delay can also be reduced by regional measurement of the system parameters. On the other hand, the implementation of many local components causes system complexity and needs high accuracy and initial costs [24].…”

Section: Non-unit Protection Schemementioning

confidence: 99%

Low-Voltage Solid-State DC Breaker for Fault Protection Applications in Isolated DC Microgrid Cluster

et al. 2019

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Due to the interconnected scheme of multiple components, such as distributed generators, storage systems, and loads through converters to a common bus in DC microgrids, the possibility of fault occurrence is increasing significantly. Meanwhile, due to the huge and rapid increase of short-circuit currents, the development of a small- and large-scale DC system requires a reliable and fast protection system to ensure fault clearance and maintain safety for the rest of the system. Thus, fault protection has been focused on as one of the most critical issues in a direct current network. The application of traditional circuit-breakers for DC fault protection has the drawback of slow operation, which requires a high rating power equipment. Recently, the high speed and excellent performance capabilities of semiconductor breakers have attracted a lot of attention and been considered as an optimal solution for fast DC fault interruption. In this study, a bidirectional Insulated-Gate Bipolar Transistor (IGBT) semiconductor breaker, suitable for the fault protection of low-voltage DC networks, is proposed. The operating characteristics of this breaker are based on changes in the circuit current and terminal voltage of IGBTs. It detects the abrupt change of the terminal voltage as an abnormal condition and isolates the faulted branch in a short time to prevent the operation disturbance in the healthy part of the network. Therefore, for the entire protection of a typical 400V DC-microgrid cluster, breakers need to be integrated and examined in each branch and the interconnected lines. The proposed protection method in this study is examined in a Simulink®/MATLAB environment to analyze and assess its operation.

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“…However, one limitation of this method is that the type of fault resistance cannot be estimated. Meghwani [18] has recently improved the method in order to compute the total fault resistance with the use of a 2nd order derivative of fault current. In this manner, taking the derivative of (3) gives,…”

Section: B High-speed Distance Protectionmentioning

confidence: 99%

Practical computation of di/dt for high-speed protection of DC microgrids

Rakhra

Norman

et al. 2017

2017 IEEE Second International Conference on DC Microgrids (ICDCM)

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DC microgrids have the potential to radically disrupt the distribution system market due to the benefits offered in easing the integration and control of distributed renewable energy resources and energy storage systems. However, the nonzero-crossing fault current profiles associated with short-circuited DC systems present a major challenge for protection. Isolation of faulted networks prior to the peak-current discharge of DC side capacitors may address this challenge if rapid fault detection speeds (shorter than 2ms) can be achieved. Accordingly, novel methods of utilizing the rate-of-change-of-current (di/dt) have been proposed in the literature to realize new, high-speed distance protection strategies. This paper proposes two practical methods for optimizing the numerical computation of di/dt of fault current transients and evaluates the performance of each within a MATLAB/Simulink model of a DC microgrid with artificially injected measurement noise

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A Non-unit Protection Scheme for DC Microgrid Based on Local Measurements

Cited by 276 publications

References 26 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

Low-Voltage Solid-State DC Breaker for Fault Protection Applications in Isolated DC Microgrid Cluster

Practical computation of di/dt for high-speed protection of DC microgrids

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