Detection and classification of MMC-HVDC transmission line faults based on one-terminal transient current signal

Ning, Lianying; Tai, Nengling; Zheng, Xiaodong; Huang, Wentao; Nadeem, Muhammad

doi:10.1109/pesgm.2017.8274238

Cited by 8 publications

(8 citation statements)

References 12 publications

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“…By dividing the intrinsic mode function of each layer obtained by decomposition into n parts on the time axis and combining it with information entropy, we can define the intrinsic mode energy entropy H as (Ning et al, 2017):…”

Section: The Intrinsic Mode Energy Entropymentioning

confidence: 99%

Multiterminal Hybrid DC Line Protection Based on Intrinsic Mode Energy Entropy

Xing¹,

et al. 2022

Front. Energy Res.

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In view of the UHV multiterminal hybrid DC transmission system, the DC line protection with universal applicability, fast response speed, stability, and reliability is particularly important for its safe and economic operation. In this article, the boundary frequency characteristics of the UHV multiterminal hybrid DC transmission system are analyzed by considering the DC boundary of the rectifier side and inverter side, line frequency variation, and other factors. According to the fact that the boundary of the fault line has a strong attenuation effect on the high-frequency component of the transient current, a protection method based on the intrinsic mode energy entropy is proposed to distinguish the faults inside and outside. The criterion to initiate the protection is constructed by using the amplitude of the transient power; the fault direction criterion is constructed by using the positive and negative characteristics of the transient energy of the fault power detected by power direction elements on both sides of the T-zone; the fault pole selection criterion is constructed by using the ratio of low-frequency transient power changes of positive and negative poles. Finally, the Kun–Liu–Long line UHV three-terminal hybrid DC transmission system model is built on the PSCAD/EMTDC simulation platform, and a large number of simulation examples verify that the protection can operate reliably under different fault poles, fault positions, and transition resistances.

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Section: The Intrinsic Mode Energy Entropymentioning

confidence: 99%

Multiterminal Hybrid DC Line Protection Based on Intrinsic Mode Energy Entropy

Xing¹,

et al. 2022

Front. Energy Res.

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“…Fault surges are often approximated as unit-step functions, where the rise time is negligible, but it is sensible to expect a finite rise time, due to the inevitable inertia in any real system. A non-negligible rise time has indeed been argued in the literature, with typical values of T r reported to vary between 1 and 100 µs [31]- [35]. Given that in real-life applications signals are sampled, a discrete-time description of (4) will be adopted…”

Section: Transient Modelmentioning

confidence: 99%

“…VI-C. The fault surge is assumed to have a rise time T r = 20 µs, chosen as an intermediate value in the range 1-100 µs reported in the literature [31]- [35]; Sec. VI-D presents results for other values of T r .…”

Section: A Single-phase-to-ground Faultmentioning

confidence: 99%

Surge Compression for Improved Fault Location Accuracy in Full Transient-Based Methods

Cozza

2021

IEEE Sensors J.

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This paper proves that the accuracy of singleended fault location techniques based on the correlation of fault transients in power lines can be significantly improved by inversefiltering transients first. The reason for this improved accuracy is found in the reduction of the duration of the fault surge signal, thus increasing the sensitivity of fault-location metrics to the fault position. Reported results show that by using the proposed filtering strategy, faster sampling rates systematically and significantly improve the location accuracy, as opposed to the case when no filter is applied, for which virtually no improvement is observed. Because of its higher spatial selectivity, the proposed fault-location technique required the development of a new synchronization method, which ensures a precise transient synchronization without the need for high-speed sampling. It is concluded that by jointly using the proposed transient filtering and synchronization solutions, correlation-based fault location can be significantly improved even when using sampling rates as low as 100 kHz. Extensive numerical simulations for a threephase transmission line confirm an improvement exceeding one order of magnitude in the fault location accuracy, for both lowand high-impedance faults.

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“…Since the 1990s, the voltage source inverters commonly used in HVDC project have undergone a transition from two-level and diode-clamped three-level to modular multilevel. Unlike VSCs, a MMCs is not directly connected in series with multiple IGBTs; rather, it uses a sub-module (SM) cascade method, which has the advantages of lower converter loss, better waveform quality, and faster fault handling [10] . The basic topology of MMC is illustrated in Fig.…”

Section: Modular Multilevel Convertermentioning

confidence: 99%

Fast protection strategy for DC transmission lines of MMC-based MT-HVDC grid

Sihua

Zhou

et al. 2021

Chin. J. Electr. Eng.

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：Multi-terminal high voltage DC (MT-HVDC) grid has broad application prospects in connecting different energy sources, asynchronous interconnection of power grids, remote load power supply, and other fields. At present, the key technologies that affect the development of MT-HVDC transmission system include swift fault identification and location in the DC line and its rapid isolation. Traditional fault monitoring relies on line communication, which cannot guarantee the rapidity and reliability of protection; moreover, it may even cause device damage. A fault identification scheme based on a single-terminal transient is presented in this paper. This scheme calculates the line inductance by using the rise rate of fault current at the initial stage of the fault, and determines the occurrence of the fault by comparing the observed line inductance with the set value, which lays a foundation for calculating the location of the fault point using distance protection. A simulation model on the PSCAD/EMTDC platform is built; the simulation example verifies that the proposed scheme can identify faults under dissimilar conditions while maintaining a low error level on the premise of no communication lines so as to meet the protection requirements of the MT-HVDC grid.

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Detection and classification of MMC-HVDC transmission line faults based on one-terminal transient current signal

Cited by 8 publications

References 12 publications

Multiterminal Hybrid DC Line Protection Based on Intrinsic Mode Energy Entropy

Multiterminal Hybrid DC Line Protection Based on Intrinsic Mode Energy Entropy

Surge Compression for Improved Fault Location Accuracy in Full Transient-Based Methods

Fast protection strategy for DC transmission lines of MMC-based MT-HVDC grid

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