Consideration of the Insulation Design Method on a ±200 kV Converter Valve Unit in an HVDC Converter Hall

Bang, Seungmin; Kim, Ho-Seung; Koo, Ja-Yoon; Lee, Bang-Wook

doi:10.3390/en14082296

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…If SF is less than 1, the insulation performance is very unsafe [21]. Alternatively, if SF is greater than 1, the performance is safe [21]. As a result, the electrical characteristics of the final model are all safe because the value of SF exceeds 1.…”

Section: Insulation Supplement Design Methods For the Real-time Monitoring Technologymentioning

confidence: 99%

“…SF is given by the following Equation [20]: In Equation ( 4), E criterion refers to the maximum electric field at the discharge of the dielectric material, and E Designed refers to the maximum electric field of the designed model. If SF is less than 1, the insulation performance is very unsafe [21]. Alternatively, if SF is greater than 1, the performance is safe [21].…”

Section: Insulation Supplement Design Methods For the Real-time Monitoring Technologymentioning

confidence: 99%

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Real-Time Monitoring of the Vacuum Degree Based on the Partial Discharge and an Insulation Supplement Design for a Distribution Class Vacuum Interrupter

Bang

Lee

2021

Energies

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The internal pressure of a vacuum interrupter (VI) is increased by arc heat, ceramic cracking, gas leakage, and manufacturing defects. Accordingly, the dielectric strength of VI rapidly decreases. To improve the reliability of power transmission, efficient maintenance through the real-time monitoring of the vacuum degree is essential. However, real-time monitoring of the vacuum degree is difficult, and related research is scarce. Additionally, due to the insulation problems of this technology, there are few commercially available products. Therefore, this paper proposes a method for real-time monitoring of the vacuum degree and an insulation supplement design for a distribution class VI. First, dielectric experiments were conducted to identify the section in which the dielectric strength of the VI rapidly decreased according to the vacuum degree. Second, for real-time monitoring of the VI, several factors were proposed through the partial discharge in the VI, while the capacitance characteristics of the VI were calculated to improve the signal of the internal partial discharge. Finally, to supplement the dielectric problems of the solid insulation high voltage apparatus that occur when real-time monitoring technology is applied, the insulation supplement design was performed through the finite element method (FEM).

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Section: Insulation Supplement Design Methods For the Real-time Monitoring Technologymentioning

confidence: 99%

Section: Insulation Supplement Design Methods For the Real-time Monitoring Technologymentioning

confidence: 99%

Real-Time Monitoring of the Vacuum Degree Based on the Partial Discharge and an Insulation Supplement Design for a Distribution Class Vacuum Interrupter

Bang

Lee

2021

Energies

Self Cite

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“…When modeling HVDC substation structure, the equipment model in real scale should be built accurately to obtain the stress of structural components, node displacements, and local mode/vibration, among other indicators. Those are necessary to increase the computation accuracy and are calculated for the important equipment positions (Bang et al, 2021). Further, large-scale high-voltage electrical equipment has a significant number of diverse components.…”

Section: Introductionmentioning

confidence: 99%

Simplified Method for Vibration Model of Converter Valve in Offshore HVDC Substation Based on Response Surface

Sun

Li²,

Zhao³

et al. 2022

Front. Energy Res.

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To ensure the computational accuracy for the offshore high voltage direct current substation local structure and its large and complex electrical equipment, it is necessary to reduce the modeling complexity and improve the calculation efficiency. Thus, a simplified vibration model with constant key physical parameters was established; the converter valve was used as a test design example and a lower number of samples was used. Finally, the response surface fitting was carried out. Based on the machine learning concept, problems such as the loss of physical meaning of complex system matrices and low iteration efficiency, caused by high-dimensional matrix operations were avoided. In addition, the deterministic screening experiment design greatly reduced the number of samples needed while also ensuring the second-order effect. The fit between the response surface equation and experimental results was good after optimizing the relevant design factors based on the vibration equation. The comparison between the simplified vibration converter valve model and the original complex model has shown that the errors for various physical parameters and the vibration characteristics were below 5% and that the model simplification degree was 95%.

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“…There is much research on converter valves focused on their electrical characteristics [8][9][10]. However, the support (or suspension) structure has poor overall stiffness, resulting in high vibration vulnerability under strong dynamic actions, such as earthquakes [11][12][13], which is obviously different from the vibration response and vibration vulnerability of the wind turbine tower or offshore jacket structure [14][15][16][17]. At present, existing research on the seismic performance of converter valve towers has mainly been performed using onshore substations.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Analysis of an Offshore Converter Platform with Valve Towers under Seismic Excitation

Sun

Zhao

et al. 2022

Symmetry

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Converter valves are the core equipment of offshore wind power structures. However, they are highly vulnerable to vibration under strong earthquakes, which will affect normal operation of the offshore wind farm. Converter station is an axisymmetric structure with obvious asymmetry in its internal configuration of the superstructure. This study aimed to analyze the dynamic response of a supported converter valve in an offshore converter station under seismic excitation. The coupling model of the supported valve tower group and the converter station were established, and the distribution law of the valve tower dynamic response and foundation settlement were investigated. The dynamic response effect of the modal truncation, valve tower stiffness, and basic size on different areas and foundations of the valve towers were studied. The findings were as follows: (i) the effect of local vibration of the valve tower should not be simplified by using equivalent mass and node condensation; (ii) the structure–equipment coupling analysis method should be used to review the structural design scheme of the offshore converter station in the intensity VII region; (iii) the vertical higher-order modes should be considered during the vibration response calculation and its participation ratio in mass should not be lower than 90%; (iv) the frequency range that minimizes the vibration response is the characteristic frequency range of horizontal vibration, while the best vibration suppression effect cannot be obtained in both the horizontal and vertical directions; and (v) the stiffness of the valve tower itself should be adjusted and different stiffness designs of the valve tower in different positions should be adopted to realize effective vibration response control.

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Consideration of the Insulation Design Method on a ±200 kV Converter Valve Unit in an HVDC Converter Hall

Cited by 8 publications

References 10 publications

Real-Time Monitoring of the Vacuum Degree Based on the Partial Discharge and an Insulation Supplement Design for a Distribution Class Vacuum Interrupter

Real-Time Monitoring of the Vacuum Degree Based on the Partial Discharge and an Insulation Supplement Design for a Distribution Class Vacuum Interrupter

Simplified Method for Vibration Model of Converter Valve in Offshore HVDC Substation Based on Response Surface

Dynamic Response Analysis of an Offshore Converter Platform with Valve Towers under Seismic Excitation

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