Tapping existing LCC-HVdc systems with Voltage Source Converters

Suriyaarachchi, D.H.R.; Karawita, C.; Mohaddes, M.

doi:10.1109/pesgm.2016.7741731

Cited by 10 publications

(2 citation statements)

References 5 publications

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“…The modular multilevel converter (MMC), introduced in the early 2000s, is widely popular due to its lower harmonics, and high efficiency for high voltage and power applications [12]. The fault response of a full-bridge MMC (FB-MMC) tapping station for an LCC-HVDC system is analysed in [13]; however, the study is limited to only one tapping station and systems with multiple taps that can interact with one another is not investigated. The feasibility of tapping an LCC-HVDC system with two VSC tapping stations is studied in [14].…”

Section: Introductionmentioning

confidence: 99%

Control strategies to improve stability of LCC‐HVDC systems with multiple MMC taps

Liu

Kish

Azad

2019

IET Generation, Transmission & Distribution

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Section: Introductionmentioning

confidence: 99%

Control strategies to improve stability of LCC‐HVDC systems with multiple MMC taps

Liu

Kish

Azad

2019

IET Generation, Transmission & Distribution

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“…Modern VSC stations are built using modular multilevel converter (MMC) technology using half-bridge sub-modules (HB-SM) or full-bridge sub-modules (FB-SM) [22]. Although the FB-SM option is more flexible and has the inherent DC fault current blocking capability, it is relatively expensive and currently not widely applied in practical systems.…”

mentioning

confidence: 99%

A Selective Fault Clearing Scheme for a Hybrid VSC-LCC Multi-Terminal HVdc System

et al. 2020

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A selective fault clearing scheme is proposed for a hybrid voltage source converter (VSC)-line commutated converter (LCC) multi-terminal high voltage direct current (HVdc) transmission structure in which two small capacity VSC stations tap into the main transmission line of a high capacity LCC-HVdc link. The use of dc circuit breakers (dc CBs) on the branches connecting to VSCs at the tapping points is explored to minimize the impact of tapping on the reliability of the main LCC link. This arrangement allows clearing of temporary faults on the main LCC line as usual by force retardation of the LCC rectifier. The faults on the branches connecting to VSC stations can be cleared by blocking insulated gate bipolar transistors (IGBTs) and opening ac circuit breakers (ac CB), without affecting the main line’s performance. A local voltage and current measurement based fault discrimination scheme is developed to identify the faulted sections and pole(s), and trigger appropriate fault recovery functions. This fault discrimination scheme is capable of detecting and discriminating short circuits and high resistances faults in any branch well before 2 ms. For the test grid considered, 6 kA, 2 ms dc CBs can easily facilitate the intended fault clearing functions and maintain the power transfer through healthy pole during single-pole faults.

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A protection scheme for hybrid multi-terminal HVDC networks utilizing a time-domain transient voltage based on fault-blocking converters

Chen

Liang

et al. 2020

International Journal of Electrical Power & Energy Systems

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Tapping existing LCC-HVdc systems with Voltage Source Converters

Cited by 10 publications

References 5 publications

Control strategies to improve stability of LCC‐HVDC systems with multiple MMC taps

Control strategies to improve stability of LCC‐HVDC systems with multiple MMC taps

A Selective Fault Clearing Scheme for a Hybrid VSC-LCC Multi-Terminal HVdc System

A protection scheme for hybrid multi-terminal HVDC networks utilizing a time-domain transient voltage based on fault-blocking converters

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