Results 1 to 10 of about 34,516 (159)
Quantitative Assessment for Commutation Security Based on Extinction Angle Trajectory [PDF]
Journal of Modern Power Systems and Clean Energy, 2021 In order to reduce the risk of commutation failure (CF) in the AC/DC hybrid power system, the quantitative analysis on CF is required for on-line assessment and optimal control.
Qi Tao, Yusheng Xue
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Critical Angle Refractometry for Lossy Media with a Priori Known Extinction Coefficient [PDF]
Physics, 2021 Critical angle refractometry is an established technique for determining the refractive index of liquids and solids. For transparent samples, the critical angle refractometry precision is limited by incidence angle resolution.
Spyridon Koutsoumpos +2 more
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Improved predictive calculation-based extinction angle control for HVDC
International Journal of Electrical Power and Energy Systems, 2021 Abstract In HVDC projects, the predictive calculation-based extinction angle control (PC-EAC) generates the firing angle order by means of open loop. Under the steady-state condition, the result of its calculation is accurate. However, when a fault occurs in AC system, a serious calculation error will exist, which increases the risk of commutation ...
Qiumei Wu, Chuang FU, Shukai Xu
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A novel laboratory methodology to evaluate the particle extinction-to-backscatter ratio or particle lidar ratio of aerosols [PDF]
Scientific ReportsWhile atmospheric particles are ubiquitous in nature and contribute to the Earth’s radiative budget, their backscattering and extinction remain insufficiently quantified due to their complexity in size, shape and chemical composition.
Alain Miffre +3 more
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Wide-angle near infrared polarizer with extremely high extinction ratio
Optics Express, 2013 An infrared polarizer is designed with a predicted extremely high extinction ratio exceeding 3 × 10(16) and transmittance higher than 89% for one polarization in the wavelength region from 1.6 to 2.3 µm. Moreover, the performance does not start to deteriorate until 60° tilting angle.
Bo Zhao
exaly +3 more sources
Fabrication of multi-layer antireflection coating consisting of ZnS and MgF2 [PDF]
Progress in Physics of Applied Materials, 2021 In this study, Magnesium Fluoride (MgF2) and Zinc Sulfide (ZnS) multi-layer antireflection coatings were prepared using Glancing Angle Deposition (GLAD) technique.
Reza Zarei Moghadam +3 more
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Zhongguo dianli, 2021 Aiming at the continuous commutation failures in LCC-HVDC systems, a nonlinear dynamic current deviation control method is proposed. The operation curve of current deviation controller is dynamically adjusted according to the severity of AC faults ...
Bo YUAN +6 more
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Bibechana, 2021 Interstellar dust properties using far-infrared bands analyze nature around asymptotic giant branch stars and stellar objects. Here, we present physical properties around the cavity region across an AGB star named IRAS 04427+4951 Sky View Observatory of ...
Devendra Raj Upadhyay, Trishna Subedi
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Commutation Failure Predictive Control Based on Fast AC Voltage Measurement in LCC-HVDC
IEEE Access, 2023 To inhibit commutation failure (CF), in this paper, the influence factors of CF were analyzed, and considering different fault types and different valves, the mathematical expression of extinction angle was deduced.
Guodong Huang +5 more
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Commutation Failure Mitigation Method Based on Imaginary Commutation Process
Journal of Modern Power Systems and Clean Energy, 2022 The commutation failure (CF) mitigation effectiveness is normally restricted by the delay of extinction angle (EA) measurement or the errors of existing prediction methods for EA or firing angle (FA). For this purpose, this paper proposes a CF mitigation
Renlong Zhu +6 more
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