Optimization of insulators in ±550 kV HVDC GIS for offshore wind platform considering charge accumulation

Li, Yixuan; Zhang, Boya; Li, Xingwen; Li, Kaixuan; Jiao, Kai; Zhang, Nan; Xuan, Yi

doi:10.1016/j.epsr.2023.109549

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…During the past decade, this model has facilitated numerous simulation studies on the multi-physical coupling processes in DC GIS [11][12][13][14][71][72][73][74][75][76][77][78][79], providing a deeper understanding of the surface charging mechanism. For instance, it is now recognized that surface charge accumulation is determined by the competitive relationship between gas current and solid current [12-14, 75, 76]; furthermore, simulation results provide information about the field transition process from capacitive to resistive in DC GIS and the corresponding time constant [12-14, 75, 76]; recently, this model has also assisted in optimizing structure and material designs [77][78][79].…”

Section: Fundamentals Of Surface Charge Accumulationmentioning

confidence: 99%

“…Kansai Electric Power Co., Inc. [153], ABB [159], Siemens [160] and Pinggao Electric Co., Ltd [154] have separately performed DC superimposed LI tests on their designed insulators. In our recent research with Xi'an XD Switchgear Electric Co., Ltd [79], we have designed a DC insulator of ±550 kV GIS for use in offshore wind platforms. In the design, an additional criterion was added to minimize the tangential component of the electric field under DC superposition LI voltage.…”

Section: Structure Optimizationmentioning

confidence: 99%

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Insight into charge-induced flashover at the gas–solid interface in DC gas-insulated systems

Zhang,

Li,

Min

et al. 2023

J. Phys. D: Appl. Phys.

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The proliferation of urbanization and the integration of new energy sources have stimulated the development of gas-insulated transmission lines and switchgear (GIL/GIS). In particular, the compact DC GIS in offshore converter platforms will significantly reduce footprints for DC switchyards, exhibit exceptional climatic resistance, and facilitate the cost-effective connection of remote offshore wind farms and submarine links. Nevertheless, insulators used in GIS/GIL always suffer from surface charge accumulation under DC stress, which could distort and enhance the local electric field and thus trigger a flashover at the gas-solid interface if it exceeds certain magnitude levels. This susceptibility becomes a major concern affecting the reliability of DC gas-insulated systems. Beyond these engineering-related challenges lie fundamental physics problems involving mechanisms of charge accumulation and charge-induced flashover which still require exploration. To this end, this paper presents an overview of recent advancements on this topic whilst highlighting relevant issues to be addressed. Specifically, the surface charge accumulation phenomena under DC fields are reviewed, and the charging mechanisms are summarized from macroscopic to microscopic perspectives. Further, the correlation between surface charge and surface flashover is discussed. Moreover, recent developments in tailoring methods for surface charging are also presented. Finally, perspectives are given on current research progress and future needs.

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Section: Fundamentals Of Surface Charge Accumulationmentioning

confidence: 99%

Section: Structure Optimizationmentioning

confidence: 99%

Insight into charge-induced flashover at the gas–solid interface in DC gas-insulated systems

Zhang,

Li,

Min

et al. 2023

J. Phys. D: Appl. Phys.

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“…GIS for ±320 kV in 2023 and ±550 kV in the future [1,2]. Xidian Group Co., Ltd and Piaggio Group Co., Ltd in China are also engaged in the development of ±550 kV GIS [3,4]. Additionally, Siemens is conducting research on the Blue DC GIS, which utilizes air insulation [2].…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of charge-induced surface discharge under positive impulse voltages

Li,

Zhang,

Zhou

et al. 2024

J. Phys. D: Appl. Phys.

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Charge-induced surface flashover is a critical factor leading to insulation failures in high-voltage direct current (HVDC) gas-insulated equipment, and the underlying mechanisms are still unclear. In the present study, the impact of charge polarity and position on surface discharge characteristics in ambient air are studied, and the surface charge dynamics during multiple discharge process are also focused. The results indicate that the repulsive effect of deposited positive charges significantly inhibits the positive streamer development by reducing the electric field. The acceleration of negative charges on positive streamer propagation is the result of two competitive mechanisms: the enhancement of the electric field and the neutralization with positive charges in the streamer channel. In the multiple discharge process, positive streamers develop along the gap of positive streamer channels from the previous discharge. When the last discharge is intense enough, back discharges may occur along the pattern of the deposited positive channels from the previous discharge. These findings will be advantages in improving the insulation reliability of gas insulated equipment.

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Optimization method for geometric shape of DC GIL insulators based on electric thermal multi-physics field coupling model

Shao

2024

Electr Eng

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Optimization of insulators in ±550 kV HVDC GIS for offshore wind platform considering charge accumulation

Cited by 7 publications

References 23 publications

Insight into charge-induced flashover at the gas–solid interface in DC gas-insulated systems

Insight into charge-induced flashover at the gas–solid interface in DC gas-insulated systems

Mechanisms of charge-induced surface discharge under positive impulse voltages

Optimization method for geometric shape of DC GIL insulators based on electric thermal multi-physics field coupling model

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