A Multi-Stage Model for the Electromagnetic Shielding Effectiveness Prediction of an Infinite Conductor Plane With Periodic Apertures

Bai, Wanxin; Guo, Anhong; Li, Tianle; Cheng, Ruiqi; Jiao, Chongqing

doi:10.1109/access.2019.2916145

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…As a result, in order to ensure the operational reliability of the MMC‐HVDC converter valve, protective measures should be taken combined with the specific electromagnetic environment inside the valve tower in actual engineering, such as installing a shielding box [26] on the drive board of the top layer SMs of the valve tower, especially the SMs at the centre.…”

Section: Analysis Of Magnetic Field Disturbance Characteristicsmentioning

confidence: 99%

Analysis for magnetic field disturbance of modular multilevel converter based high voltage direct current (MMC‐HVDC) converter valve

Wang

Zhang

et al. 2022

High Voltage

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The standardised design and operational reliability enhancement of the flexible DC converter valve are impending with the construction of high shares of renewables and power electronics power system. A power frequency magnetic field calculation model able to obtain the electromagnetic disturbance at the submodule (SM) drive board during normal operation of a flexible DC converter valve is presented. Hundreds of SMs with complex structures in a converter valve tower are simplified by the equivalent to the line current to fulfil calculation accuracy requirements. In addition, a random function is employed to simulate the non‐sequential switching process of the SMs. By comparing the calculated results with the measured data obtained from the SM equivalent operation experiment of 2200 V/2150 A, the validity of the calculation model is confirmed. According to the final calculations, the influence of non‐sequential switching cannot be ignored when recognising the time‐domain distribution features of the power frequency magnetic field of the drive board. However, engineering design can be guided only by the power frequency magnetic field intensity of the drive board calculated based on SM’s full removal in the valve tower.

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Section: Analysis Of Magnetic Field Disturbance Characteristicsmentioning

confidence: 99%

Analysis for magnetic field disturbance of modular multilevel converter based high voltage direct current (MMC‐HVDC) converter valve

Wang

Zhang

et al. 2022

High Voltage

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“…Possible reasons for this deviation are: The energy flow in the complex structure of enclosures leads to reflection and diffraction. From the comparison between the SE results of the front and rear enclosure, it can be seen that: (1) in the lower frequency band, the shielding capacity of the rear enclosure is better than that of the front enclosure; (2) the result of SE contains not only the resonant modes of the front enclosure but also the resonances of the rear enclosure.…”

Section: Validation For Casementioning

confidence: 99%

“…Shielding is a widely used solution to reduce interference. The performance of a shielding enclosure is quantified by its shielding effectiveness (SE), which is the ratio of the electric field at an observation point without and with the enclosure 1 . Since a shielding enclosure always contains apertures, the electromagnetic shielding effectiveness of an enclosure with aperture is a typical problem in electromagnetic interference.…”

Section: Introductionmentioning

confidence: 99%

Fast prediction of the shielding effectiveness of heterotypic enclosures based on EMT theory

Zhou

Wang

2022

Int J RF Mic Comp-Aid Eng

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A fast analytical method for predicting the shielding effectiveness (SE) of heterotypic enclosures was proposed. By applying the concept of electromagnetic topology, the observation points and the walls are treated as nodes, and the space between them as tubes. Equivalent circuit models of the enclosures are derived in which the aperture on the front wall are considered as a two-port network and so is the shape of the discontinuous part, which resembles a window structure. Then, the expressions of the total voltage components can be obtained using the extended Baum-Liu-Tesche (BLT) equation. Three different types of heterotypic enclosures are proposed to validate the method. Compared with numerical simulation, the proposed method can reduce the computation time from 1000 s for numerical algorithms to a few hundred milliseconds while maintaining a very close accuracy.

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“…Low-frequency magnetic shielding is frequently commonly used to prevent electromagnetic interference in various practical applications, including electric vehicles [1], wireless power transfer [2,3], power converters [4], ultrasensitive atomic sensors [5], resistance spot welding [6], magnetic resonance imaging [7], and power transformers [8]. Depending on specific requirements and working environments, different shielding configurations are selected, such as enclosures [1,9], solid plates [10][11][12][13][14], perforated plates [15][16][17], and wire meshes [18][19][20][21]. Among these, perforated plates offer moderate shielding effectiveness (SE), ventilation capacity, and weight, making them especially suitable for situations where a tradeoff among SE, ventilation, and weight is required.…”

Section: Introductionmentioning

confidence: 99%

“…This article builds upon earlier research on a single-layer conducting plate with periodic apertures (CPPA) [15] by studying the SE of a double-layer CPPA. It should be noted that for such a small spacing, the analytical theory based on the traditional surface impedance formula is no longer applicable [15,19,21]. This is because the surface impedance will be affected by the close layer-to-layer coupling.…”

Section: Introductionmentioning

confidence: 99%

Low-frequency Magnetic Shielding of Double-layer Conducting Plates with Periodic Apertures: Experimental Observation of Great Improvement of Shielding Effectiveness by Slightly Separating the Two Plates

Zhou¹,

Wu²,

Gu³

et al. 2023

PIER M

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This article focuses on the low-frequency magnetic shielding of double-layer conducting plates with periodic circular apertures. The shielding effectiveness (SE) is measured as the insertion loss of the plates when they are placed between a pair of coaxial loops, one for magnetic field emission and the other for receiving. Our experimental results show that the SE sharply increases with the layer-to-layer spacing increasing from zero to the aperture diameter. For aluminum plates with 1 mm thickness, 20 mm unit cell, and 10 mm aperture diameter, the enhancement is approximately 10 dB and 20 dB for 3 mm and 9 mm spacing, respectively. In addition, the effect of the lateral deviation on the SE is evident only if the spacing is smaller than the aperture diameter.

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A Multi-Stage Model for the Electromagnetic Shielding Effectiveness Prediction of an Infinite Conductor Plane With Periodic Apertures

Cited by 7 publications

References 13 publications

Analysis for magnetic field disturbance of modular multilevel converter based high voltage direct current (MMC‐HVDC) converter valve

Analysis for magnetic field disturbance of modular multilevel converter based high voltage direct current (MMC‐HVDC) converter valve

Fast prediction of the shielding effectiveness of heterotypic enclosures based on EMT theory

Low-frequency Magnetic Shielding of Double-layer Conducting Plates with Periodic Apertures: Experimental Observation of Great Improvement of Shielding Effectiveness by Slightly Separating the Two Plates

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