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Journal ArticleDOI

Multi-Frequency bands based Pole-to-Ground fault detection method for MMC-Based radial DC distribution systems

Changqing Yang, +2 more
- Vol. 141, pp 108250-108250
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TLDR
In this paper , a faulty feeder detection method based on the characteristics of transient zero-mode current (TZMC) in multi-frequency bands is proposed, which is tested through simulations on the PSCAD/EMTDC platform.
Abstract
In a small-current grounding system, the pole-to-ground fault may cause the voltage drop in the fault pole and the voltage rise in the other poles. In flexible DC distribution systems, Severe voltage variation may shorten the insulation lifetime of the equipment, which leads to great concerns on the safety issue. In addition, the existence of high transition resistance degrades the accuracy of fault detection methods, thus further affecting the reliability of the system. Therefore, it is essential to explore an advanced technology for faulty feeder detection. This study proposes a faulty feeder detection method based on the characteristics of transient zero-mode current (TZMC) in multi-frequency bands. The change rate of zero-mode voltage is applied as the protection activation criterion. Then, the characteristic matrix is constructed via computing the fuzzy entropy of TZMC in each frequency band. Finally, the faulty feeder can be identified by conducting fuzzy C-means on the characteristic matrix. This proposed method is tested through simulations on the PSCAD/EMTDC platform, which successfully demonstrates its outstanding adaptability, reliability, and accuracy.

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Citations
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Research on Synchronous Condenser Configuration Method for Hybrid Cascade UHVDC Transmission System Considering Voltage Instability Risk

TL;DR: In this paper , a transient voltage instability risk indicator (TVIRI) based on multi-binary tables is considered, and a condenser capacitor capacity optimization model for multi-feed DC receiving systems is established based on this indicator.
Journal ArticleDOI

An adaptive reclosing scheme for MVDC distribution networks with mechanical DCCBs

TL;DR: In this article , an adaptive reclosing scheme for medium-voltage DC (MVDC) networks is proposed in which an additional signal injection branch with a simple control strategy is added to the existing commutation branch of a mechanical DCCB for reclosing.
Proceedings ArticleDOI

Research on Synchronous Condenser Configuration Method for Hybrid Cascade UHVDC Transmission System Considering Voltage Instability Risk

TL;DR: In this article , a transient voltage instability risk indicator (TVIRI) based on multi-binary tables is considered, and a condenser capacitor capacity optimization model for multi-feed DC receiving systems is established based on this indicator.
Journal ArticleDOI

A ground fault section location method based on active detection approach for non-effectively grounded DC distribution networks

TL;DR: In this article , a ground fault section location method based on active detection approach is proposed to solve the problem of identifying and locating the single-pole-to-ground fault for non-effectively grounded DC distribution networks.
References
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Journal ArticleDOI

Short-Circuit and Ground Fault Analyses and Location in VSC-Based DC Network Cables

TL;DR: In this paper, cable faults in VSC-based dc networks are analyzed in detail with the identification and definition of the most serious stages of the fault that need to be avoided and a fault location method is proposed.
Journal ArticleDOI

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

TL;DR: In this paper, a nonunit protection scheme for DC microgrids utilizing only local measurements is proposed based on the natural characteristics of DC current and its first and second derivatives under fault transients.
Journal ArticleDOI

A Transient Voltage-Based DC Fault Line Protection Scheme for MMC-Based DC Grid Embedding DC Breakers

TL;DR: A fault identification method based on the difference of square of transient voltages to identify the faulted lines for DC grids using overhead lines and a line protection scheme including detection activation, fault identification, faulted pole discrimination, and post-fault re-closing is designed.
Journal ArticleDOI

Short-Time Fourier Transform Based Transient Analysis of VSC Interfaced Point-to-Point DC System

TL;DR: This paper presents quantitative investigation of the high-frequency components utilizing short-time Fourier transform (STFT) during transient conditions and validated and substantiated with the real fault current data obtained from a scaled-down experimental testbed.
Journal ArticleDOI

A Novel Fault Location Method and Algorithm for DC Distribution Protection

TL;DR: In this article, the authors proposed a fault location algorithm for tightly coupled dc distribution systems, which can estimate the equivalent inductance between a protection device and a fault in less than 1 ms.