Design issues and practical application challenges of DC shipboard distribuiton system protection

Li, Qi; Liang, Jiaqi

doi:10.1109/ests.2015.7157926

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…In the future, fault tolerant converters (such as modular multilevel converter and dual active bridge converter) are likely to be widely deployed with LVDC distribution systems. Such technologies will allow the use of lower rating power electronic devices with reduced cost [23]. This will require an effective coordination between the Paper 0673 CIRED 2017 5/5…”

Section: Discussionmentioning

confidence: 99%

Evaluation of existing DC protection solutions on an active LVDC distribution network under different fault conditions

Wang

Emhemed

Norman

et al. 2017

CIRED - Open Access Proceedings Journal

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Low Voltage Direct Current (LVDC) distribution is considered as one of the new promising technologies for better integration of distributed generation, and supplying local loads in more efficient way compare to AC systems. However, DC protection is still considered as one of the outstanding challenges that holds back the wide deployment of LVDC in last mile utility applications. Most of existing DC solutions have been developed for specific applications such as data centres, PV systems, electric ships, and traction systems. However, their suitability for providing a good level of protection and safety for an LVDC last mile public network is still not fully understood. Therefore, this paper evaluates the performances of a wide number of DC protection solutions that have been proposed for the applications on an active LVDC last mile distribution network with local generation sources (including PVs and battery storages). Based on the findings, recommendations of LVDC protection for resilient operation are presented in the paper.

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Section: Discussionmentioning

confidence: 99%

Evaluation of existing DC protection solutions on an active LVDC distribution network under different fault conditions

Wang

Emhemed

Norman

et al. 2017

CIRED - Open Access Proceedings Journal

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“…Conventional methods to identify a fault section in a ring-type distribution system are based on the fault current as opposed to voltage along the feeder [15,28]. This is because it is possible to specify a fault section more accurately by measuring the flow direction of a fault current.…”

Section: Review Of Conventional Methodsmentioning

confidence: 99%

Development of fault section identification technique for low voltage DC distribution systems by using capacitive discharge current

Noh

Kim

Gwon

et al. 2018

J. Mod. Power Syst. Clean Energy

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The increasing importance of energy efficiency has led to several studies related to the construction of a reliable low voltage DC (LVDC) distribution system. Specifically, studies on a protection scheme that considers the fault characteristics of an LVDC distribution system are essential to improve system reliability. When compared to a conventional distribution system, the most distinct feature of an LVDC distribution system is the existence of a capacitive discharge current from converters under a fault condition that results in the prompt operation of protection devices. Therefore, this study involves proposing a precise and rapid technique to identify the fault section in an LVDC distribution system. The technique involves two stages, namely: an analysis stage to analyze the capacitive discharge current and a decision stage to identify the fault section based on the fault type. A detailed discussion of each step is presented and its feasibility is verified based on the results of simulations with an ElectroMagnetic Transients Program and MATLAB Ò .

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“…Currently, studies and standards on grounding systems in DC-SMGs are limited. On the other hand, due to the presence of pulsed loads, conventional DC MGs fault detection approaches presented in [21], [22], [23] have to be modified to fit the DC-SMGs. Without a zero-crossing point in DC fault current, DC breaker is still a barrier in high power applications, leading to the popularity of converters with fault isolation capability [24], [25], [26].…”

Section: Introductionmentioning

confidence: 99%

A Review of DC Shipboard Microgrids—Part II: Control Architectures, Stability Analysis, and Protection Schemes

Guerrero

Lashab

et al. 2022

IEEE Trans. Power Electron.

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This paper presents a review of coordinated control strategies, stability analysis, and fault management for DC shipboard microgrids (DC-SMGs). As an emerging application, the DC-SMG lacks a comprehensive summary of the control schemes. Considering the specific load profile in ships, this paper discusses the coordinated control strategies of diesel generators and energy storage system (ESS). Depending on the maritime conditions, different operation modes are switched by the energy management system (EMS). Due to the presence of highbandwidth controlled constant power load (CPL) converters, negative impedance instability is induced. Meanwhile, the pulsed loads in DC-SMG may affect the voltage stability significantly. Small-signal and large-signal stability analysis can be used to evaluate the effect of these two types of loads. In the aspect of shipboard protection system, this paper presents the specific requirements of DC-SMG based on the standards. Lacking of 'ground' in ships, solutions in designing the grounding system for DC-SMG is described. Besides, the short-circuit fault management consisting of fault detection, fault isolation, and reconfiguration in DC-SMGs are summarized. Finally, existing commercial DC ships are presented and compared to demonstrate the developing trends.

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Design issues and practical application challenges of DC shipboard distribuiton system protection

Cited by 11 publications

References 22 publications

Evaluation of existing DC protection solutions on an active LVDC distribution network under different fault conditions

Evaluation of existing DC protection solutions on an active LVDC distribution network under different fault conditions

Development of fault section identification technique for low voltage DC distribution systems by using capacitive discharge current

A Review of DC Shipboard Microgrids—Part II: Control Architectures, Stability Analysis, and Protection Schemes

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