arXiv subjects

Ahmed Abu-Siada

Publications and source records attributed to Ahmed Abu-Siada.

3 recordsLinked to original sources

arXiv2026

Coordinated Optimal Power Quality Management in Distribution Systems Using The Residual Capacity of Community IBRs

This letter proposes a network-wide coordinated optimization model to mitigate voltage unbalance (VU) by unleashing the remaining capacity of community inverter-based resources (IBRs). Existing single-sequence strategies ignore coupled capacity constraints and cause idle headroom. Meanwhile, they fail to harness the collective governance capabilities of community IBRs. To solve this discrepancy and exploit the unused potential, we developed a sequence-domain network model in dual commonly shared synchronous reference frames. Strict phase current and apparent power limits are formulated and convexified via polyhedral approximations. A quadratic objective function flexibly balances sequence capacity allocation. Simulation and experimental results validate the effectiveness of the proposed strategy.

eess.SY↗

arXiv2026

Transient Power Allocation Control Scheme for Hybrid Hydrogen Electrolyzer-Supercapacitor System with Autonomous Inertia Response

This paper proposes a hybrid hydrogen electrolyzer-supercapacitor system (HESS) with a novel control strategy for renewable-dominant power grids. The HESS consists of alkaline electrolyzers (AEL), proton exchange membrane electrolyzers (PEMEL), and supercapacitors (SC). The interfacing inverters between HESS and power grid are regulated by an inertia emulation control strategy. From HESS, AEL is with conventional DC power control, whereas PEMEL and SC are designed with the proposed dynamic inertia control and capacitive inertia control, respectively. Benefitting from the coordination of three controls, within the HESS, high-frequency transient power components are autonomously handled by SC, stable frequency power components are regulated by PEMEL, and low-frequency steady-state power is addressed by AEL, characterized by low operational gains and longer lifetimes. SC delivers transient power, significantly alleviating energy losses on electrolyzers and achieving adequate inertia recovery capabilities while requiring no additional communication. Implementing SOC recovery control enables the SC to withstand more than three times more stability discharge cycles compared to an SC without SOC recovery. Furthermore, a large-signal mathematical model based on mixed potential theory is established, providing clear stability boundaries for system parameters. Dynamic analyses theoretically verify system feasibility, and extensive hardware-in-the-loop experimental results fully validate the proposed HESS along with the corresponding transient power allocation controls.

eess.SY↗

arXiv2017

Monitoring of SF6 Degradation in GIS Using Frequency Response Analysis

Frequency Response Analysis (FRA) is generally used to detect any changes in the active part of the test object. Several studies have analyzed the effect of different mechanical changes including deformations and oil insulation decays on frequency response of transformers as a test object, however noresearch has ever studied the effect of gas degradation on frequency signature of a gas insulated substation (GIS). This paper investigates the possibility of using frequency response analysis to assess the quality of insulation medium in gas insulated substation (GIS). For this purpose, a single phase GIS filled with SF6 between the main conductor and the enclosure is simulated in Maxwell 3D using finite element method to obtain the electrical parameters of the substation in real mode operation. Measurement of frequency response was carried out in GIS simulations with different insulation qualities from healthy to weak condition. The results show that the frequency response of GIS can disclose any minor deterioration in gas quality of the switchgear.

physics.ins-det↗