Local measurement based ultra-fast directional ROCOV scheme for protecting Bi-pole HVDC grids with a metallic return conductor

Haleem, Naushath M.; Rajapakse, Athula D.

doi:10.1016/j.ijepes.2017.11.033

Cited by 34 publications

(23 citation statements)

References 24 publications

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“…Based on this, the voltage signatures are influenced due to the inductive termination of the lines. This important property can assist the discrimination of DC faults and has led to significant research, through which frequency-based nonunit protection schemes for selective HVDC protection have been developed [23]- [27]. These schemes make use of the inductive termination at both ends of a line to define protection zones and divide the system into clear zones.…”

Section: Summary Of Detection Methods and Discussionmentioning

confidence: 99%

Review and Evaluation of the State of the Art of DC Fault Detection for HVDC Grids

Psaras

Emhemed

Adam

et al. 2018

2018 53rd International Universities Power Engineering Conference (UPEC)

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This paper reviews the state of the art of DC fault discrimination and detection methods of HVDC grids, and summarises the underlying principles and the characteristics of each method. To minimize HVDC grid disturbance and power transfer interruption due to DC faults, it is critically important to have protection schemes that can detect, discriminate and isolate DC faults at high speeds with full selectivity. On this basis, this paper lists the advantages and disadvantages of the most promising fault detection methods, with the aim of articulating the future directions of HVDC protection systems. From the qualitative comparison of relative merits, the initial recommendations on HVDC grid protection are presented. Moreover, a comprehensive quantitative assessments of different fault detection methods discussed above are carried out on a generic 4-terminal meshed HVDC grid, which is modelled in PSCAD environment. The presented simulation results identify that the voltage derivative and wavelet transform are the most promising methods for DC fault detection and discrimination.

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Section: Summary Of Detection Methods and Discussionmentioning

confidence: 99%

Review and Evaluation of the State of the Art of DC Fault Detection for HVDC Grids

Psaras

Emhemed

Adam

et al. 2018

2018 53rd International Universities Power Engineering Conference (UPEC)

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“…The limiting inductors placed at both ends of the links delimit the borders of the protection zones, allowing selectivity. A faster protection system is presented in [26] where the ratio between the ROCOV at both sides of the reactor is used as a fault marker; it presents a detection time of 200 microseconds.…”

Section: Rate Of Change Of Voltagementioning

confidence: 99%

Fault detection based on ROCOV in a multi-terminal HVDC grid

Pérez-Molina¹,

Eguia²,

Larruskain-Eskobal³

et al. 2024

RE&PQJ

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Protection of a meshed VSC-HVDC grid is a challenge due to the behaviour of DC current and voltage signals during fault conditions. Protection systems must operate in a very short time range. Since fault detection should be very fast, local measurement based algorithms are mostly used; communication based algorithms lack the needed speed as a result of the communication time delay. This way, a ROCOV algorithm is proposed in this paper. This algorithm is analysed for different fault conditions.

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“…The frequency response of the voltage transfer functions is used to identify the decomposition level (and its corresponding frequency band), in which the impact of a highly-resistive internal fault is more distinctive than that of the external fault. To quantify this impact, the areas underneath the U r /U f transfer function are calculated at each level j, for a 500 Ω resistive fault at F int and for a solid fault at F ext , as shown in (9). The areas are denoted as λ j int and λ j ext , respectively.…”

Section: A Selection Of Decomposition Levelmentioning

confidence: 99%

Non-Unit Protection for HVDC Grids: An Analytical Approach for Wavelet Transform-Based Schemes

Psaras

Tzelepis

Vozikis

et al. 2021

IEEE Trans. Power Delivery

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Speed and selectivity of DC fault protection are critical for High-Voltage DC (HVDC) grids and present significant technical and economic challenges. Therefore, this paper proposes a non-unit protection solution that detects and discriminates DC faults based on frequency domain analysis of the transient period of DC faults. The representation of a generic HVDC grid section and the corresponding DC-side fault signatures in the frequency domain form the basis of a generalized approach for analytically designing a protection scheme based on Wavelet Transform (WT). The proposed solution is adaptive within its design stage and offers general applicability and immunity to system changes, while the protection settings are configured for optimized performance. The scheme is validated through offline simulations in PSCAD/EMTDC and the technical feasibility of the algorithm in the real world is demonstrated through the use of real-time digital simulation (using RTDS) and Hardware-inthe-Loop (HIL) testing. Both offline and real-time simulations demonstrate that the scheme is able to detect and discriminate between internal and external faults at a significantly high speed, while remaining sensitive to high impedance faults and robust to external disturbances and outside noise.

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Local measurement based ultra-fast directional ROCOV scheme for protecting Bi-pole HVDC grids with a metallic return conductor

Cited by 34 publications

References 24 publications

Review and Evaluation of the State of the Art of DC Fault Detection for HVDC Grids

Review and Evaluation of the State of the Art of DC Fault Detection for HVDC Grids

Fault detection based on ROCOV in a multi-terminal HVDC grid

Non-Unit Protection for HVDC Grids: An Analytical Approach for Wavelet Transform-Based Schemes

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