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Your search keyword '"Illias, Hazlee A."' showing total 32 results
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32 results on '"Illias, Hazlee A."'

13. Modelling spatiotemporal impact of flash floods on power distribution system and dynamic service restoration with renewable generators considering interdependent critical loads.

Author

Afzal, Suhail, Mokhlis, Hazlie, Illias, Hazlee Azil, Bajwa, Abdullah Akram, Mekhilef, Saad, Mubin, Marizan, Muhammad, Munir Azam, and Shareef, Hussain

Subjects
WINDSTORMS, DYNAMICAL systems, INFRASTRUCTURE (Economics), FLOODS, DYNAMIC loads, CITIES & towns
Abstract

In recent decades, flash floods have become more common because of climate change and are considered a substantial risk for many cities worldwide. This catastrophic natural hazard presents a significant threat to critical infrastructure in urban areas, particularly the power distribution system. As modern societies are much more dependent on electrical energy these days, it is essential and imperative to make existing distribution systems resilient against flash flooding. Although researchers in this area have proposed various algorithms to impart resilience to a distribution system, however, the focus in these works is on wind‐related events such as hurricanes, cyclones, and windstorms. Therefore, here, the spatiotemporal effects of a flash flood on the distribution system are modelled using a grid‐based hydrodynamic model. The evolving line faults are then included in the proposed resilience‐oriented time horizon‐based service restoration model that also considers dynamic load demand, heavy uncertainties related to renewable generation, and interdependence among critical loads. Finally, the resilience of the distribution system's response is assessed using an operational resilience metric. The efficacy of the proposed framework is evaluated on IEEE 33‐bus and 69‐bus systems and the results show that the model provides an efficient restoration solution despite increased complexity caused by varying conditions. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Planar Sensor for Noise Cancellation During Partial Discharge Detection in Open Substation

Author

Azam, S. M. Kayser, Othman, Mohamadariff, Illias, Hazlee Azil, Latef, Tarik Abdul, Mahadi, Wan Nor Liza Wan, Fahmi, Daniar, Hossain, A. K. M. Zakir, and Ain, Mohd Fadzil

Abstract

In compliance with next-generation high-voltage substations, ultrahigh-frequency (UHF) planar sensors are becoming more popular than ever for their online features in partial discharge (PD) diagnostics. However, PD signals mixing with different noises still exist as a major challenge for UHF sensors. Especially in open substations, telecommunication interferences become predominant noise sources to an external UHF sensor placed outside of the equipment chamber. Even though band-stop filters are additionally connected to UHF sensors for denoising, the inherent noise cancellation mechanism is not yet found in any UHF sensor. With the best of our knowledge and survey, we are the first to introduce here a planar sensor that inherently eliminates telecommunication interferences during PD detection (PDD) for open substations even without using any postprocessing filters. To design our sensor, we have applied techniques of truncated partial ground plane for wideband characteristics and modified radiating patch for enhanced gain performance. A novel intermingled coupling resonator is designed to remove the GSM-900 band from within the sensor bandwidth. We have tested our prototype both for free-space propagation and PDD performances. The prototype has a compact physical size of $16\times $ 8 cm2 and an operational bandwidth of 792–1414 MHz. For a surface discharge source, the prototype successfully detects the PD signals at the earliest stage. Our prototype minimizes the ambient noise floor to 2.5 mV and improves the signal-to-noise ratio by more than 27.9 dB, which is relatively higher than conventional UHF sensors. The proposed sensor also has the potential of classifying PD sources.

Published
2023
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