Abdelsalam A. Eajal

University of Waterloo | UWaterloo · Department of Electrical & Computer Engineering

This paper presents a proactive operation scheme for improving distribution system resiliency against natural hazards, specifically windstorms. In this context, important attributes associated with the windstorm consisting the distance from the windstorm route, the wind speed, the distance from tall trees and buildings, and cable type are used in a...

Islanded microgrids have specific features that should be considered in their harmonic analysis. First, microgrids' distributed generators (DGs) are typically droop-based, and accordingly , the steady-state frequency is different from the nominal one. This affects the harmonics produced by DGs and nonlinear loads. Second, there is no slack bus, whi...

The bidirectional power flow through the interlinking converter (IC), in ac/dc hybrid microgrids (HMGs) consisting of distributed generators (DGs) with droop controllers, plays an important role on the stability of such systems during islanding. This paper investigates the impact of the power flow direction on the small-signal stability of islanded...

The DC microgrid (DC MG) concept enables the hosting of DC-type renewable energy resources. However, their intermittent nature means that a high penetration of renewables can jeopardize supply adequacy and voltage provision during islanding. The work presented in this paper was therefore directed at developing a probabilistic graphical approach bas...

AC/DC hybrid microgrids (HMGs) represent a promising architecture that allows the hosting of a mix of ac/dc energy resources and ac/dc loads. Despite their potential, when islanded, HMGs impose operational challenges among of which are precise and stable power sharing, frequency restoration, and voltage regulation. Imprecise power sharing can resul...

The future smart grid encompasses ac–dc clusters known as ac–dc microgrids. For reliability and security purposes, each microgrid hosts a mix of synchronous-based and converter-based distributed resources. However, synchronous-based generators, in particular, are characterized by their limited reactive power capabilities because of the limitation o...

This paper presents a new optimal power flow (OPF) formulation based on loadability maximization for islanded converter-dominated AC/DC hybrid microgrids. Hybridizing AC and DC at the distribution level brings the merits of AC and DC together as a valuable future layout for AC and DC technologies. Nevertheless, most recent AC/DC distributed resourc...

The future smart grid can have an AC/DC hybrid structure that enables the integration of AC/DC energy supply and demand, thus permitting the formation of AC/DC hybrid microgrids (HMGs). The AC/DC HMG is a promising concept that provides the envisioned smart grid with the plug-and-play feature. Nevertheless, understanding such hybrid systems, especi...

A promising configuration for future smart grids is an AC/DC hybrid topology that enables the integration of AC/DC energy resources and modern loads, thus permitting the consequent formation of AC/DC hybrid microgrids (HMGs). An understanding of AC/DC HMGs and their operational premise during islanding will certainly pave the way toward the realiza...

This paper presents a two-stage stochastic centralized dispatch scheme for AC/DC hybrid smart grids. The developed dispatch scheme coordinates the operations of a variety of distributed energy resources (DERs), such as distributed generators (DGs) and energy storage systems (ESSs). It also ensures the coordinated charging of electric vehicles (EVs)...

This paper presents stochastic energy management system (S-EMS) in hybrid ac/dc smart grids. The developed S-EMS coordinates the operations of various distributed resources (DRs), i.e., distributed generators (DGs) and energy storage systems (ESSs). It also ensures coordinated charging of the plug-in electric vehicles (PEVs). The energy management...

The smart grid allows its consumers to participate in producing cost effective, sustainable, and environmentally friendly electricity. The consumers in a smart grid, for example, can plug their Electric Vehicles (EVs) into the grid to charge and discharge their vehicles' batteries. However, charging of the electric vehicles, especially during the p...

In this study, the power scheduling problem in μ-grids is investigated taking the uncertainties in power demand and wind power into account. The problem is formulated as a stochastic mixed-integer linear optimization problem with the objective being minimizing the total μ-grid cost. The objective is subject to a set of operational constraints impos...

The smart grid allows its consumers to participate in producing cost effective, sustainable, and environmentally friendly electricity. The consumers in a smart grid, for example, can install small-scale Distributed Generation (DG) units to supply their own loads and support the grid during the peak periods. However, these DG units need to be proper...

Shunt capacitor installation in distribution systems is very beneficial and requires optimal placement and sizing of theses capacitors. Due to the proliferation of electronic devices, more harmonics are being injected into distribution systems. Adding shunt capacitors may lead to high distortion levels. The capacitor placement and sizing problem is...

Shunt capacitors can be of great help in enhancing the performance of distribution systems. However, the addition of shunt capacitors may lead to high distortion levels causing damage to electric equipment of both the electric utility and customers. As a result, shunt capacitors should be optimally located and rated taking the presence of harmonics...

The capacitor placement and sizing problem is formulated as a nonlinear integer optimization problem. The discrete nature of commercially available capacitor sizes is considered. This research investigates two objectives of the optimal placement and sizing of shunt capacitors. The first objective is to minimize the system real power loss while keep...

Shunt capacitors installation in distribution systems requires optimal placement and sizing. More harmonics are being injected into distribution systems. Adding shunt capacitors may lead to high distortion levels. The capacitor placement and sizing problem is a nonlinear integer optimization problem, with locations and ratings of shunt capacitors b...