Measurement and assessment of corona current density for HVDC bundle conductors by FDM integrated with full multigrid technique

Abouelatta, Mohamed; Ward, Sayed A.; Sayed, Ahmad M.; Mahmoud, Karar; Lehtonen, Matti; Darwish, Mohamed M. F.

doi:10.1016/j.epsr.2021.107370

Cited by 16 publications

(6 citation statements)

References 39 publications

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“…At the same time, due to the limitation of detection technology, it is difficult to analyze the stress of the internal components of the proportional model, so the means of verifying the vibration characteristics of the proportional model have been limited to the vibration signal analysis of the external points of the model [10]. Finite element simulation technology provides an idea for the analysis of such devices with complex internal structures and multi field stress coupling [11][12][13][14]. However, in the current finite element model research, electromagnetic field analysis is also used as the verification method of similar models, and the consistency of vibration characteristics before and after the similarity is not taken as the core idea of converter transformer vibration model verification.…”

Section: Introductionmentioning

confidence: 99%

A Vibration Similarity Model of Converter Transformers and Its Verification Method

et al. 2022

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According to the vibration characteristics of converter transformers, considering the Maxwell equation, magnetostrictive effect, Lorentz force and structural mechanics, the similarity criterion suitable for converter transformers is deduced in this paper. Using the finite element simulation platform, the multi physical field coupling model of converter transformers is constructed, and the scale coefficient is 0.1. The magnetic flux density distribution, stress distribution, shape variable and vibration characteristics of the model before and after the similarity are analyzed. The results show that the variation law of the model before and after the similarity conforms to the similarity criterion, and the correctness of the similarity criterion is verified. The converter transformer vibration similarity model and its verification method can effectively reduce the unnecessary waste of resources before the preparation of converter transformers and have important reference value for the analysis and improvement of converter transformer vibration characteristics.

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Section: Introductionmentioning

confidence: 99%

A Vibration Similarity Model of Converter Transformers and Its Verification Method

et al. 2022

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“…Moreover, a strategy for enhancing the PPHC in horizontally polarized BPFs has been proposed in [43], where a measured improvement of 8.7 dB in the high-pressure range has been demonstrated. Also, other recent trends can be highlighted in the area of the corona discharge breakdown in microwaves, such as those where some novel numerical approaches have been studied [44], [45].…”

Section: Introductionmentioning

confidence: 99%

In-Depth Study of the Corona Discharge Breakdown Thresholds in Groove Gap Waveguides and Enhancement Strategies for Inductive Bandpass Filters

et al. 2022

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This work focuses on the study of the corona discharge breakdown in groove gap waveguides (GGWs) and inductive bandpass filters (BPFs) based on this technology. With the main aim of improving the peak power handling capability (PPHC), the location of the maximum normalized electric field strength (| ÊMAX |) as a function of the geometrical parameters is analyzed. First, the research deals with wave-guiding structures, comparing the distribution of the transverse electric TE 10 -like mode of a GGW to that of an equivalent rectangular waveguide (RW). Next, a design strategy based on the adjustment of the geometrical dimensions of the bed of nails is proposed, thus achieving a considerable reduction of | ÊMAX |. The second part of this paper aims for vertically polarized GGW BPFs, where the inductive irises become the most critical part of the component. By a simple modification of their dimensions, a second design criterion is suggested for improving the PPHC. Finally, several Ku-band BPFs centered at 14 GHz and 16 GHz have been manufactured and experimentally verified at the European High-Power Radiofrequency Space Laboratory. This measurement campaign shows peak power thresholds up to 1.09 kW and 3.59 kW at 600 mbar for the non-and full-optimized GGW BPFs, respectively, thereby demonstrating a PPHC enhancement up to 5.16 dB in the high-pressure range when both strategies, proposed in this work, are used.INDEX TERMS Corona breakdown, gas discharge, groove gap waveguides, microwave bandpass filters, peak power handling capability (PPHC), power applications, voltage magnification.

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“…Consequently, DC microgrids have been proven as one of the most efficient and cost-effective systems in the integration of RES with loads, as they decrease the AC-DC and DC-AC power conversion stages compared to AC microgrids [10,11]. Machine learning and artificial intelligence have shown promising performance in different electrical engineering applications [12][13][14][15][16] as well as power system components, e.g., power transformers and high voltage transmission lines [17][18][19][20][21][22][23]. Figure 1 illustrates the microgrid components in which the load and the diesel generator along with the wind turbines are connected to the AC side.…”

Section: Introductionmentioning

confidence: 99%

Novel Control Strategy for Enhancing Microgrid Operation Connected to Photovoltaic Generation and Energy Storage Systems

et al. 2021

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Recently, the penetration of energy storage systems and photovoltaics has been significantly expanded worldwide. In this regard, this paper presents the enhanced operation and control of DC microgrid systems, which are based on photovoltaic modules, battery storage systems, and DC load. DC–DC and DC–AC converters are coordinated and controlled to achieve DC voltage stability in the microgrid. To achieve such an ambitious target, the system is widely operated in two different modes: stand-alone and grid-connected modes. The novel control strategy enables maximum power generation from the photovoltaic system across different techniques for operating the microgrid. Six different cases are simulated and analyzed using the MATLAB/Simulink platform while varying irradiance levels and consequently varying photovoltaic generation. The proposed system achieves voltage and power stability at different load demands. It is illustrated that the grid-tied mode of operation regulated by voltage source converter control offers more stability than the islanded mode. In general, the proposed battery converter control introduces a stable operation and regulated DC voltage but with few voltage spikes. The merit of the integrated DC microgrid with batteries is to attain further flexibility and reliability through balancing power demand and generation. The simulation results also show the system can operate properly in normal or abnormal cases, thanks to the proposed control strategy, which can regulate the voltage stability of the DC bus in the microgrid with energy storage systems and photovoltaics.

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Measurement and assessment of corona current density for HVDC bundle conductors by FDM integrated with full multigrid technique

Cited by 16 publications

References 39 publications

A Vibration Similarity Model of Converter Transformers and Its Verification Method

A Vibration Similarity Model of Converter Transformers and Its Verification Method

In-Depth Study of the Corona Discharge Breakdown Thresholds in Groove Gap Waveguides and Enhancement Strategies for Inductive Bandpass Filters

Novel Control Strategy for Enhancing Microgrid Operation Connected to Photovoltaic Generation and Energy Storage Systems

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