Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints
High-voltage direct current (HVDC) links are starting to become widely implemented thanks to their interesting advantages such as reduced operation losses, the absence of reactive power, which allows energy transport via underground cables over long distances, and improved power control. The latter...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-12-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/1/172 |
| _version_ | 1797625901304774656 |
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| author | Younes Moufakkir Ayyoub Zouaghi Christian Vollaire |
| author_facet | Younes Moufakkir Ayyoub Zouaghi Christian Vollaire |
| author_sort | Younes Moufakkir |
| collection | DOAJ |
| description | High-voltage direct current (HVDC) links are starting to become widely implemented thanks to their interesting advantages such as reduced operation losses, the absence of reactive power, which allows energy transport via underground cables over long distances, and improved power control. The latter advantage is very essential for renewable energy resource integration into power grids. However, a thorough understanding of the behavior of insulation systems for HVDC components is critical so as to ensure a more reliable service. Indeed, the existence of the direct current (DC) voltage in HVDC components may induce surface and space charge accumulation that can stress insulation further or even promote discharge inception and propagation. As such, this work focuses on showcasing the effect of surface charge on streamers that develop on the interface of liquid–solid insulation due to the advent of lightning impulse (LI) voltage in the HVDC link. This study was performed using finite-element-based numerical simulations that include a quasi-electrostatic model for surface charge accumulation and an electrohydrodynamic fluid model for streamer initiation and propagation. The geometry used was point–plane configuration where the high voltage is applied to the needle electrode located above the liquid–solid interface. The obtained results suggest that streamer initiation is affected by both the accumulated surface charge density and polarity. For a positive streamer, an accumulation of positive surface charge increases the discharge inception voltage as a result of a weakening in the electric field, while an accumulation of negative surface charge decreases the discharge inception voltage due to an intensification in the electric field. Moreover, streamer travel distance and velocity are also both shown to be affected by surface charge accumulation. |
| first_indexed | 2024-03-11T10:03:02Z |
| format | Article |
| id | doaj.art-81d0c9f87b8546b8a94956c417d82cb0 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T10:03:02Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-81d0c9f87b8546b8a94956c417d82cb02023-11-16T15:15:29ZengMDPI AGEnergies1996-10732022-12-0116117210.3390/en16010172Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed ConstraintsYounes Moufakkir0Ayyoub Zouaghi1Christian Vollaire2Univ Lyon, Ecole Centrale de Lyon, INSA Lyon, Université Lyon 1, CNRS, Ampère, UMR5005, 69130 Ecully, FranceUniv Lyon, Ecole Centrale de Lyon, INSA Lyon, Université Lyon 1, CNRS, Ampère, UMR5005, 69130 Ecully, FranceUniv Lyon, Ecole Centrale de Lyon, INSA Lyon, Université Lyon 1, CNRS, Ampère, UMR5005, 69130 Ecully, FranceHigh-voltage direct current (HVDC) links are starting to become widely implemented thanks to their interesting advantages such as reduced operation losses, the absence of reactive power, which allows energy transport via underground cables over long distances, and improved power control. The latter advantage is very essential for renewable energy resource integration into power grids. However, a thorough understanding of the behavior of insulation systems for HVDC components is critical so as to ensure a more reliable service. Indeed, the existence of the direct current (DC) voltage in HVDC components may induce surface and space charge accumulation that can stress insulation further or even promote discharge inception and propagation. As such, this work focuses on showcasing the effect of surface charge on streamers that develop on the interface of liquid–solid insulation due to the advent of lightning impulse (LI) voltage in the HVDC link. This study was performed using finite-element-based numerical simulations that include a quasi-electrostatic model for surface charge accumulation and an electrohydrodynamic fluid model for streamer initiation and propagation. The geometry used was point–plane configuration where the high voltage is applied to the needle electrode located above the liquid–solid interface. The obtained results suggest that streamer initiation is affected by both the accumulated surface charge density and polarity. For a positive streamer, an accumulation of positive surface charge increases the discharge inception voltage as a result of a weakening in the electric field, while an accumulation of negative surface charge decreases the discharge inception voltage due to an intensification in the electric field. Moreover, streamer travel distance and velocity are also both shown to be affected by surface charge accumulation.https://www.mdpi.com/1996-1073/16/1/172HVDCconverter transformerlightning impulsestreamerpartial dischargesurface charge |
| spellingShingle | Younes Moufakkir Ayyoub Zouaghi Christian Vollaire Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints Energies HVDC converter transformer lightning impulse streamer partial discharge surface charge |
| title | Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints |
| title_full | Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints |
| title_fullStr | Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints |
| title_full_unstemmed | Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints |
| title_short | Study of Discharge Inception and Propagation in Liquid–Solid Insulation System under DC–LI Superimposed Constraints |
| title_sort | study of discharge inception and propagation in liquid solid insulation system under dc li superimposed constraints |
| topic | HVDC converter transformer lightning impulse streamer partial discharge surface charge |
| url | https://www.mdpi.com/1996-1073/16/1/172 |
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