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

Wang, Dong; Emhemed, Abdullah; Norman, Patrick; Burt, Graeme

doi:10.1049/oap-cired.2017.0673

Cited by 16 publications

(12 citation statements)

References 20 publications

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“…Whereas, due to the rapid increase of DC fault currents and a low operation speed (hundreds of ms) of MCBs, it requires distribution line and associated power electronics devices with higher capacity and size to sustain such a high current. Comparatively, SSCB-based protection methods can provide high-speed protection (few µs) schemes to prevent the high initial cost and occupation of large spaces [29]. The SSCBs are embedded into two useful major categories in protection system devices: (i) semiconductor current limiters, and (ii) semiconductor breakers [30].…”

Section: Semiconductor Breakers and Operation Principle Of The Proposmentioning

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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Section: Semiconductor Breakers and Operation Principle Of The Proposmentioning

confidence: 99%

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

et al. 2019

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“…Suppose the relay protection system, e.g. DC differential-based protection [7,30], can quickly isolate the faulty line. Since the power flow in the DC system only involves active power, the nodal equations relating real power injections to node voltages will be…”

Section: Interval Modelling For Line Outagementioning

confidence: 99%

“…If the unit protection of VSC terminal is activated due to the violation in the post-contingency period, the terminal will also be blocked so that it may cause a great disturbance to other terminals. From the perspective of maintaining secure system operation, the injury in the post-contingency period should be avoided as much as possible [7]. Hence, online contingency monitoring and analysis based on the data collected from the energy management system (EMS) are necessary for DC networks.…”

Section: Introductionmentioning

confidence: 99%

Online contingency analysis method for multi‐terminal DC distribution networks with renewable resources

Chen

Xiao

Baran

et al. 2019

IET Generation, Transmission & Distribution

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“…In a summary and based on the review presented in [28], communication-based unit protection is more promising technique for protecting LVDC distribution networks interfaced by fault intolerant converters (i.e. two-level and NPC VSCs) compared to other non-unit methods such as inverse time graded O/C protection.…”

Section: B Review Of Existing DC Protection Solutionsmentioning

confidence: 99%

A novel protection scheme for an LVDC distribution network with reduced fault levels

Wang

Emhemed

Burt

2017

2017 IEEE Second International Conference on DC Microgrids (ICDCM)

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Low Voltage Direct Current (LVDC) distribution is one of the new promising technologies that have the potential to accelerate the wider integration of distributed renewables. However, adding new power electronics to convert AC to DC will introduce new forms of faults with different characteristics. Converters with inherent fault current limiting and blocking capabilities will significantly limit the fault currents, resulting in significant impacts on the performance of existing LV overcurrent protection schemes. New protection methods based on the change in the DC voltages have been proposed recently by different researches. The issue with these methods is that the protection relays of the un-faulted feeders will also see the same change in the voltage for certain faults, leading to substandard selectivity and unnecessary tripping. This paper investigates these challenges, and presents a novel DC protection method which is based on the use of the combination of two components: the voltage change (dv/dt) and the change of current (di/dt). The new method is mainly developed to detect and locate DC faults with reduced fault current levels within DC distribution networks. The introduced protection concept is tested on an LVDC distribution network example using PSCAD/EMTDC simulation tool.

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

Cited by 16 publications

References 20 publications

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

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

Online contingency analysis method for multi‐terminal DC distribution networks with renewable resources

A novel protection scheme for an LVDC distribution network with reduced fault levels

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