A Power Allocation Strategy for DC Line Fault in Serial Hybrid LCC-MMC HVDC System

Li, Xiaopeng; Teng, Yufei; Liu, Lei; Fang, Gui Hua

doi:10.1109/access.2022.3189171

Cited by 2 publications

(1 citation statement)

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“…frontiersin.org dimensional space projection of dual differential currents for lines connecting converter stations. Li et al (2022) designed an MMC active power allocation strategy in which, during DC line faults, the constant DC voltage converter is switched to constant active power control, and the other two converters are switched to voltage droop control. A new pilot directional protection scheme for HVDC lines based on grounding resistance was proposed by Ma et al (2022).…”

Section: Frontiers In Energy Researchmentioning

confidence: 99%

A novel primary and backup relaying scheme considering internal and external faults in HVDC transmission lines

Swetapadma

Agarwal²,

Abdelaziz

et al. 2022

Front. Energy Res.

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Discrimination of different DC faults near a converter end of a DC section consisting of a filter, a smoothing reactor, and a transmission line is not an easy task. The faults occurring in the AC section can be easily distinguished, but the internal and near-side external faults in the DC section are very similar, and the relay may cause false tripping. This work proposes a method to distinguish external and internal faults occurring in the DC section. The inputs are the voltage signals at the start of the transmission line and the end of the converter filter. The difference in voltage signals is calculated and given to an intelligent controller to detect and discriminate the faults. The intelligent controller is designed using machine learning (ML) and deep learning (DL) techniques for fault detection. The long short-term memory (LSTM-) based relay gives better results than other ML methods. The proposed method can distinguish internal from external faults with 100% accuracy. Another advantage is that a primary relay is suggested that detects faults quickly within a fraction of milliseconds. Nevertheless, another advantage is that a backup relay has been designed in case the primary relay cannot operate. Results show that the LSTM-based protection scheme provides higher sensitivity and reliability under different operation modes than the conventional traveling wave-based relay.

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Section: Frontiers In Energy Researchmentioning

confidence: 99%