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Ali Mubarak, Faisal (author), Mascolo, V. (author), Hussain, Faizan (author), Rietveld, Gert (author)Closed-form solutions are presented for calculating the reflection coefficient with corresponding uncertainty of metrology-grade 3.5 mm air-dielectric coaxial transmission lines for use as reference standards in S-parameter measurements up to 33 GHz. The closed-form solutions allow the calculation of the sensitivity coefficients required for...journal article 2024
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Yang, Zhe (author), Liu, Zhou (author), Zhang, Qi (author), Chen, Zhe (author), de Jesus Chavez, Jose (author), Popov, M. (author)The traditional fault control strategy of converter-interfaced renewable energy sources (CIRESs) may bring about a lower sensitivity level or misoperation of fault component-based directional elements. To overcome this problem, a new control scheme is proposed to adjust sequence impedance angles of CIRESs by computing suitable current...journal article 2023
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Ruiten, Kyra (author), Pesch, U. (author), Rodhouse, T.S.G.H. (author), Correljé, A. (author), Spruit, Shannon (author), Tenhaaf, Antje (author), Dijkshoorn, Jochem (author), van den Berg, Susan (author)This paper describes the decision-making process regarding the siting of a high voltage transmission line in the southern part of the Netherlands by TenneT, the Transmission System Operator responsible for the electricity infrastructure. TenneT started this siting process by deploying conventional decision-making procedures, which have the...journal article 2023
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Wei, Xiaoguang (author), Liu, Y. (author), Shi, Jian (author), Gao, Shibin (author), Li, Xingpeng (author), Han, Zhu (author)This article offers a novel perspective on identifying the critical branches under load redistribution (LR) attacks. Compared to the existing literature that is largely disruption-driven and based on dc state estimation, we propose to address the threat from LR attacks on a more fundamental level by modeling and analyzing the circulation of...journal article 2023
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Stumpf, Martin (author), Lager, I.E. (author), Antonini, Giulio (author)Thin-wire structures in the presence or absence of a ground plane are analyzed numerically in the time domain (TD) with the aid of the Cagniard-DeHoop method of moments (CdH-MoM). It is demonstrated that the TD solution of such problems can be cast into the form of discrete time-convolution equations. Under the assumption of piecewise linear...journal article 2022
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Heidary, Amir (author), Yazdani-Asrami, Mohammad (author), Hesami, Morteza (author), Sood, Vijay (author)Utilizing superconducting technology in fault current limiters for power grid applications is a practical solution to achieve a more modern and efficient power system. This is due to their low-loss profile, high efficiency, and ability to transmit about 5x more power in the same footprint compared to conventional counterparts. In addition,...journal article 2022
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Behdani, B. (author), Tajdinian, Mohsen (author), Allahbakhshi, Mehdi (author), Popov, M. (author), Shafie-khah, Miadreza (author), Catalao, Joao P. S. (author)Geomagnetically induced currents (GICs) are referred to the quasi-DC current flows in power networks, driven by complex space weather-related phenomena. Such currents are a potential threat to the power delivery capability of electrical grids. To mitigate the detrimental impacts of GICs on critical infrastructures, the GICs should be monitored...journal article 2022
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Kumaran, A.K. (author), Nemati, Hossein Mashad (author), de Vreede, L.C.N. (author), Alavi, S.M. (author)This paper presents a design procedure for compact lumped-element 3-/4-/5-way Doherty power combiners suitable for mm-wave 5G transmitters. Among them, the 3-way Doherty power combiner is favored due to its low complexity, compact layout, and average drain efficiency at 12 dB power back-off (PBO) when implemented using lossy lumped elements....conference paper 2022
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Hähnle, S.A. (author)Superconducting integrated circuits (SICs) represent a natural step forward for devices operating at frequencies from microwave up to sub-millimeter wavelengths. They offer massive miniaturization via compact design based on low-loss superconducting transmission lines. At sub-millimeter wavelengths, the development of SICs is driven by...doctoral thesis 2021
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Kang, Xuanwu (author), Sun, Y. (author), Zheng, Yingkui (author), Wei, Ke (author), Wu, Hao (author), Zhao, Yuanyuan (author), Liu, Xinyu (author), Zhang, Kouchi (author)In this brief, a high-performance quasi-vertical GaN Schottky barrier diode (SBD) on sapphire substrate with post-mesa nitridation process is reported, featuring a low damaged sidewall with extremely low leakage current. The fabricated SBD with a drift layer of 1 μm has achieved a very high ON/OFF current ratio (Iscriptscriptstyle ON...journal article 2021
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Fu, J. (author), Song, Guobing (author), De Schutter, B.H.K. (author)Fault location algorithms for transmission lines use the parameters of the transmission line to locate faults after the faults have occurred along the line. Although these parameters can be estimated by the phasor measurement units (PMUs) at the terminal(s) of the transmission line continuously, the uncertainty in the measurements will give...journal article 2021
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Stumpf, Martin (author), Antonini, Giulio (author), Lager, I.E. (author)The pulsed electromagnetic (EM) field transfer between a horizontal electric dipole (HED) and a transmission line is described analytically with the aid of the time-domain (TD) reciprocity theorem and the Cagniard-de Hoop technique. A suitably chosen wave-slowness representation makes it possible to cast the pertaining interaction integrals...journal article 2020
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Galatro, L. (author)As the number of wireless applications increases every year, overcrowding the RF/microwave spectrum, research community and industry are gradually starting to dedicate more attention to the less exploited (sub)millimeter wave spectrum, spanning from 30 GHz to 1 THz. While the high frequency and large available bandwidth of the latter promises...doctoral thesis 2019
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Khuntia, S.R. (author), Rueda, José L. (author), van der Meijden, M.A.M.M. (author)Location of wind power plants and demand centres are not always close by; hence, the transmission of energy puts a burden on existing grid infrastructure. This unwanted burden necessitates transmission lines to operate more and more frequently close to their operating limits. To alleviate such situations, this research addresses the advantages...journal article 2019
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van der Blij, N.H. (author), Ramirez Elizondo, L.M. (author), Spaan, M.T.J. (author), Bauer, P. (author)Employing bipolar dc distribution systems introduces the possibility of imbalance in the system. To analyze these systems it is crucial to create novel modelling techniques. This paper presents a method to decompose dc distribution systems into symmetrical components. The presented method simplifies the analysis of balanced, unbalanced, and...journal article 2018
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Kulkarni, Raunak R. (author), Khuntia, S.R. (author), Joseph, A. (author), Rueda, José L. (author), Palensky, P. (author)A substantial increase in renewable energy in-feed to the primary grid as well as demand growth poses a challenge for transmission system operators (TSOs) to perform maintenance activities while addressing security of supply. A computationally efficient outage scheduling algorithm which is customizable in terms of area and time selection is...conference paper 2018
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Dabironezare, Shahab Oddin (author), Hassel, J. (author), Gandini, E. (author), Grönberg, L. (author), Sipola, H. (author), Vesterinen, V. (author), Llombart, Nuria (author)In this contribution, a focal plane array (FPA) at submillimeter wavelengths is presented for security applications. The detectors are based on kinetic inductance bolometers. Two frequency selective absorber (FSA) sets were designed to implement a security imager. The effective pattern of the imager coupled to a black body point source over a...conference paper 2018
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Pan, K. (author), Teixeira, André (author), Cvetkovic, M. (author), Palensky, P. (author)Understanding smart grid cyber attacks is key for developing appropriate protection and recovery measures. Advanced attacks pursue maximized impact at minimized costs and detectability. This paper conducts risk analysis of combined data integrity and availability attacks against the power system state estimation. We compare the combined...journal article 2018
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van Berkel, S.L. (author), Garufo, A. (author), Llombart, Nuria (author), Neto, A. (author)In this article, we present a freely accessible software tool that allows for fast characterization of dynamic phenomena in a wide variety of transmission lines that include characteristic impedance, effective dielectric constant, and losses, such as radiation into space and surface waves. For printed transmission lines, the radiation effects...journal article 2016
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Popov, M. (author), Parmar, Shreya (author), Rietveld, Gert (author), Preston, Gary (author), Radojevic, Zoran (author), Terzija, Vladimir (author)This paper presents a comparison between two different approaches to fault location both with and without utilising transmission line parameters. Firstly, an impedance-based parameter-dependent algorithm, derived by using modal transformation theory and fast Fourier transform is presented. The methodology is able to locate the fault whether it...journal article 2016
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