Efficient protection scheme for low‐voltage DC micro‐grid

Som, Shreyasi; Samantaray, Subhransu Ranjan

doi:10.1049/iet-gtd.2017.1533

Cited by 58 publications

(17 citation statements)

References 19 publications

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“…The advent of smart grid technology requires an intelligent and automated fault detection and clearing operation scheme with little or no human interventions required [23]. This enhances protection and monitoring devices to be intelligently smart and adaptive in nature to faults or disturbances for data acquisition [24], faults classification and trip decision making when necessary [25].…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, it is limited to fault current discrimination across transmission lines and cannot handle fault classifications, and location functions. An adaptive backup scheme has been proposed for fault location determination using a limited number of the phasor line voltage and current measurements from the backup protection zone [20], [23], [24]. An advanced signal processing analysis method of wavelet transform analysis of fault voltage and current waveforms recorded at a suitable monitoring location in the multi-bus meshed power system, to detect and classify faults has been proposed [25].…”

mentioning

confidence: 99%

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Hybrid Signal Processing and Machine Learning Algorithm for Adaptive Fault Classification of Wind Farm Integrated Transmission Line Protection

Emmanue

Othman

Hizam

et al. 2019

IJIE

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Hybrid Signal Processing and Machine Learning Algorithm for Adaptive Fault Classification of Wind Farm Integrated Transmission Line Protection

Emmanue

Othman

Hizam

et al. 2019

IJIE

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“…Therefore, protection schemes were proposed that utilize knowledge about the system's topology in order to achieve selectivity. For example, faults can be located by measuring the grid's impedance and comparing it to known line parameters, or a wavelet transform can be used to identify faults by comparing them to simulations of the system [24][25][26][27][28]. Furthermore, a handshaking protection scheme was introduced, which locates and isolates a fault by temporarily powering down the dc system [29].…”

Section: Introductionmentioning

confidence: 99%

Decentralized Plug-and-Play Protection Scheme for Low Voltage DC Grids

et al. 2020

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Since the voltages and currents in dc grids do not have a natural zero-crossing, the protection of these grids is more challenging than the protection of conventional ac grids. Literature presents several unit and non-unit protection schemes that rely on communication, or knowledge about the system’s topology and parameters in order to achieve selective protection in these grids. However, communication complicates fast fault detection and interruption, and a system’s parameters are subject to uncertainty and change. This paper demonstrates that, in low voltage dc grids, faults propagate fast through the grid and interrupted inductive currents commutate to non-faulted sections of the grid, which both can cause circuit breakers in non-faulted sections to trip. A decentralized plug-and-play protection scheme is proposed that ensures selectivity via an augmented solid-state circuit breaker topology and by utilizing the proposed time-current characteristic. It is experimentally shown that the proposed scheme provides secure and selective fault interruption for radial and meshed low voltage dc grids under various conditions.

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“…However, they do not provide any fault control capabilities and hence require higher equipment ratings and fast protection due to high di/dt and high fault current infeed from the AC grid. There are already a number of DC protection solutions available in the literature to meet such requirements [12][13][14][15]. Very recently, new innovative interface technologies such as solid-state transformers (SSTs) have been proposed to replace conventional transformers at medium voltage (MV) to LV (MV/LV) secondary substations with the additional capability to provide both LVAC and LVDC supply [16].…”

Section: Introductionmentioning

confidence: 99%

Improved voltage‐based protection scheme for an LVDC distribution network interfaced by a solid state smart transformer

Wang

Emhemed²,

Burt

2019

IET Generation, Transmission & Distribution

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The increasing electrification of transport and heat will place increasing demand on low voltage (LV) networks with the potential to overload MV/LV transformers and LV cables. Deployment of a solid state transformer (SST) at MV/LV substations and using LV Direct Current (LVDC) distribution systems offer great potential to address such c hallenges. However, the SST deployment in addition to the introduction of LVDC will fundamentally change LV fault behaviour and protection requirements due to the limited short-circuit capabilities of such technologies. The SST will deliver limited fault c urrents, making currentbased protection (widely used in LV networks) less reliable. Therefore, this paper presents an advanced communication-less protection scheme which can effectively detect and locate DC faults even with reduced fault levels. The devel oped protection scheme overcomes the selectivity limitations in LVDC voltage-based protection solutions by using a combination of DC voltage magnitude, voltage concavity (sign of d 2 v/dt 2) and the sign of the rate of change of current (di/dt) regardless of the current magnitudes. The credibility of the developed protection algorithm is tested against different fault scenarios applied on an active LVDC network model built in PSCAD/EMTDC. Noise signals have been included in the simulation to appraise the resilience of the developed scheme.

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Efficient protection scheme for low‐voltage DC micro‐grid

Cited by 58 publications

References 19 publications

Hybrid Signal Processing and Machine Learning Algorithm for Adaptive Fault Classification of Wind Farm Integrated Transmission Line Protection

Hybrid Signal Processing and Machine Learning Algorithm for Adaptive Fault Classification of Wind Farm Integrated Transmission Line Protection

Decentralized Plug-and-Play Protection Scheme for Low Voltage DC Grids

Improved voltage‐based protection scheme for an LVDC distribution network interfaced by a solid state smart transformer

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