A. Hellal

A. Hellal
National Polytechnic School of Algiers | ENP · Department of Electrical Engineering

MS, PhD In Power Systems (McGill University, Montreal, Canada)

About

60
Publications
10,657
Reads
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315
Citations
Citations since 2016
5 Research Items
188 Citations
201620172018201920202021202205101520253035
201620172018201920202021202205101520253035
201620172018201920202021202205101520253035
201620172018201920202021202205101520253035
Additional affiliations
January 1992 - October 2015
National Polytechnic School of Algiers
Position
  • Professor (Assistant)
October 1984 - December 1991
McGill University
Position
  • Doctorant
Description
  • I was in Post Graduate studies

Publications

Publications (60)
Article
Full-text available
This article presents a robust and optimal PSS tuning with the Monte‐Carlo approach for probabilistic small‐signal stability analysis in electric power systems under uncertainties. The uncertainties are mainly related to renewable energy and include production and demand in power systems. Additionally, lines and transformers contingencies have also...
Conference Paper
Full-text available
The Topology Processing is a crucial part in the energy management system. The topology processor must handle reading of the input data, treating the splitting and merging buses and their connectivity to the different circuits and proceeding to islanding and energizing analysis of the network. It has also to support all the types of substations con...
Conference Paper
Full-text available
The integration of shunts capacitor in the distribution system can have significant effects on the behavior of the system. An improper insertion of this equipment can cause negative impacts, the solution of these impacts requires an optimal location of shunt capacitors with adequate power injected. The main objective of this study is to determine t...
Conference Paper
Shunt capacitors placement is addressed in this paper. A cost based model to find the optimal size and location of shunt capacitors in a power distribution networks is proposed in which the objective is to minimize the total annual cost function of capacitor placement and power losses. Biogeography-Based Optimization (BBO) algorithm is adopted in t...
Article
Full-text available
Photovoltaic electrical forecasting is significance for the optimal operation and power predication of grid-connected photovoltaic (PV) plants, and it is important task in renewable energy electrical system planning and operating. This paper explores the application of neural networks (NN) to study the design of photovoltaic electrical forecasting...
Article
Full-text available
This paper proposes a technique for shedding against voltage collapse (Under Voltage Load Shedding or UVLS) which is based on the optimal power flow procedure OPF with transient stability constraints (Transient Stability Constraints Optimal Power Flow TSC-OPF). To solve this problem we used a meta-heuristic approach to learn the method of Genetic A...
Conference Paper
Full-text available
The present paper describes the application of the biogeography-based optimization approach to determine the optimal real time reconfiguration in radial distribution smart networks. The main objectives are to minimize the active power loss. A detailed performance analysis is applied on 33, 69, 84, and 118 bus networksto illustrate the effectiveness...
Article
Full-text available
This paper presents the solution of Security-Constrained Unit Commitment Problem (SCUCP) using the simulated annealing method with memory component (MSA). The Unit Commitment solutions without operational and power flow constraints are not practical due to the secure operation of the power system network. The algorithm was developed in an Object-Or...
Article
Full-text available
This paper deals with small signal stability analysis for large scale power systems using Krylov subspace techniques, we develop an algorithm based on the Implicitly Restarted method coupled with a dynamic switching approach in such manner to adapt the well known algorithm to our study issue which is converging to the few sought eigenvalues with po...
Conference Paper
Full-text available
This paper aims to present the design of a computer code Transient Stability Code (TRANS_STAB_CODE) for the Transient Stability studies of electrical power systems under the influence of harmonics, using the GUI in MATLAB. The program was run for the loads are linear and nonlinear (Static Var Compensator (SVC), Thyristor controlled Reactor (TCR), a...
Article
Full-text available
The present paper describes a multi-objective optimization approach to determine the optimal placement and sizing of Distributed Generation (DG) units in radial distribution systems. The main objectives are to minimize the active power loss and to enhance the voltage stability. Non-dominated Sorting Genetic Algorithms II (NSGA-II) is used to obtain...
Conference Paper
Full-text available
This paper deals with the application of an adaptive Implicitly Restarted Arnoldi Algorithm based on Krylov subspaces to the small signal stability eigen analysis problem for power systems.. The aim of our modified algorithm is to find directly to the sought critical eigenvalues concerned with poor damping ratios instead of calculating the whole of...
Article
Photovoltaic power generation forecasting is an important task in renewable energy power system planning and operating. This paper explores the application of neural networks (NN) to study the design of photovoltaic power generation forecasting systems for one week ahead using weather databases include the global irradiance, and temperature of Ghar...
Article
This paper aims to present the design of a computer code (HPFCODE), for calculate a power flow and power losses in power systems under the influence of harmonics, using the GUI in MATLAB. After described the program was run for two networks IEEE 6 nodes and IEEE 14 nodes. The power flow by Newton-Raphson method was calculated as the losses of activ...
Article
This paper aims to present the design of a computer code (HPFCODE) of the power flow and losses in power systems under the influence of harmonics, using the GUI in MATLAB. After describing the program was run for two networks IEEE 6 nodes and IEEE 14 nodes. The power flow by Newton-Raphson method was calculated as the loss of active and reactive po...
Article
Full-text available
This paper proposes an improved local search metaheuristic using simulated annealing method with memory component (MSA) for solving the unit commitment problem (UCP) with ramp constraints. The proposed method benefits simultaneously from the advantages of a two metaheuristics: acceptance of “bad” solutions in order to escape from local optimal conf...
Article
Full-text available
Short-term photovoltaic power generation forecasting is an important task in renewable energy power system planning and operating. This paper explores the application of neural networks (NN) to study the design of photovoltaic power generation forecasting systems for one week ahead using weather databases include the global irradiance, and temperat...
Article
This paper proposes a novel approach of genetic algorithms (GAs) based on dynamic search space constraints for the optimization of power system stabilizers (PSSs). When using search spaces with fixed constraints, the evolution of the objective function may slow down or even stabilize before to reach the global optimal solution. Our approach is base...
Article
This paper presents the application of hybrid techniques based on collaborative combinations of meta-heuristic methods applied to the problem of the Optimal Reactive Power Flow (ORPF). These approaches are a combination of population methods (such as genetic algorithms and particle swarm optimization) and local search methods (such as tabu search a...
Article
Full-text available
This article aims to create simulation software MATP for power systems transients, replacing the two transient's simulation softwares ATP and PSCAD. We described the program MATP, and then we simulated several defects that can cause transients in different networks by ATP, PSCAD and MATP with interpretations of results.
Article
The choice of Power System Stabilizer (PSS) parameters and PSS number as well as their location in power systems are an essential feature in small signal stability. This paper presents genetic algorithms based technique that improves PSS tuning and optimizes location with a reduced number of PSSs devices in a multimachine power system. To validate...
Article
Le choix des paramètres et le nombre de stabilisateurs de puissance (PSS : Power System Stabilizer), ainsi que leur localisation au sein d'un réseau électrique constituent une composante essentielle de la stabilité aux petites perturbations. Dans cet article nous présentons une technique d'amélioration du réglage, de la localisation et de la réduct...
Article
Le choix des paramètres et le nombre de stabilisateurs de puissance (PSS : Power System Stabilizer), ainsi que leur localisation au sein d'un réseau électrique constituent une composante essentielle de la stabilité aux petites perturbations. Dans cet article nous présentons une technique d'amélioration du réglage, de la localisation et de la réduct...
Article
Full-text available
An efficient distribution of the reactive power in an electric network aims generally to maintain voltages in acceptable limits and control transmission losses. This paper presents a comparative study of solving the optimal reactive power flow (ORPF) problem using several meta-heuristic techniques such as simulated annealing, genetic algorithms, ev...
Article
Power system stabilizers (PSS) are usually used in power system plants to damp out power system oscillations. In this paper, a simultaneous coordinated tuning procedure of multiple power system stabilizers (PSSs) in multimachine power systems based multiobjective functions Hybridation technique using genetic algorithms (GAs) and the requit simulé (...
Conference Paper
The optimal performance of power system stabilizers (PSSs), in multimachine power systems, depends highly on their parameters, location and number. This paper presents an approach of simultaneous optimization of PSS parameters, location and number in multimachine power systems based eigenvalue multiobjective function and solving using genetic algor...
Article
Full-text available
Purpose – The purpose of this paper is to deal with a new dispatching and optimization of reactive power sources in power systems. Design/methodology/approach – The methodology is first based on an optimal movement of existing reactive sources as a first phase, then an optimal investment in a second phase and finally a combination of the two previ...
Article
Full-text available
La répartition efficace de la puissance réactive dans un réseau électrique vise à maintenir la tension dans les limites acceptables de fonctionnement et à contrôler les pertes de transmission. Cet article présente la résolution du problème de l'écoulement optimal de puissance réactive en utilisant la méthode d'optimisation par essaim de particules...
Article
Full-text available
This article presents an artificial neural-net based technique that combines supervised and unsupervised learning for evaluating online power system static security. It automatically scans contingencies of a power system. The proposed approach allows the online security evaluation of (N - 1) contingencies by considering the pre-fault state vector....
Article
The authors present a fast and reliable software method for power system static security assessment. This method deals with the generalization of fast decoupled load flow calculations based on the use of participation factors of generating units and realistic load behaviour representation. Results of simulation tests with IEEE-14 and IEEE-30 bus ne...
Article
This paper proposes a new methodology which combines supervised and unsupervised learning for evaluating power system dynamic security. Based on the concept of stability margin, pre-fault power system conditions are assigned to the output neurons on the two-dimensional grid with the growing hierarchical self-organizing map technique (GHSOM) via sup...
Article
This paper proposes a new methodology for the power system dynamic security assessment. Based on the concept of stability margin, the method estimates a dynamic stability index that corresponds to the most critical value of synchronizing and damping torques of multimachine power systems. ANN-based pattern recognition is carried out with the self-or...
Conference Paper
Full-text available
This paper proposes a new methodology which combines supervised and unsupervised learning for evaluating power system dynamic security. Based on the concept of stability margin, pre-fault power system conditions are assigned to the output neurons on the two-dimensional grid with the growing hierarchical self-organizing map technique (GHSOM) via sup...
Chapter
This paper proposes a new methodology which combines supervised learning, unsupervised learning and genetic algorithm for evaluating power system dynamic security. Based on the concept of stability margin, pre-fault power system conditions are assigned to the output neurons on the two-dimensional grid with the growing hierarchical self-organizing m...
Article
Full-text available
ABSTRACT . This paper presents a fast and reliable software method for power system static security assessment. This method deals with the generalization of fast decoupled load flow calculations based on the use of participation factors of generating units and realistic load behaviour modelization. Results of simulation tests with IEEE-14 and IEEE-...
Conference Paper
Full-text available
This paper presents an artificial neural-net based technique which combines supervised and unsupervised learning for evaluating on-line power system static security. It automatically scans contingencies of a power system. The proposed approach allows the on-line security evaluation of (N -1) contingencies by considering the pre-fault state vector....
Article
Full-text available
This article develops a new optimization strategy of reactive power sources based, first, on an optimal movement of existing reactive sources. A second phase concerns an optimal investment, and a third phase is a combination of the two previous phases. The formulation of the global problem leads to a constrained nonlinear one, which necessitates no...
Article
The paper presents an artificial neural-net based technique which combines supervised and unsupervised learning for on-line evaluating of power system static security. It automatically scans contingencies of a power system. The proposed approach allows the on-line security evaluation of (N - 1) contingencies by considering the pre-fault state vecto...
Conference Paper
This paper proposes a new methodology of the power system dynamic security assessment. Based on the concept of stability margin, the method estimates the dynamic stability index that corresponds to the most critical value of synchronizing and damping torques of multimachine power systems. ANN-based pattern recognition is carried out with the self-o...
Article
In a power system, the role of a generator voltage regulator is to ensure that the output voltage is maintained within an acceptable threshold. In this paper a voltage regulator is proposed. The design of this regulator is based on both variable structure control theory and a pole assignment technique. The performance of the proposed regulator has...
Conference Paper
Full-text available
In this paper an adaptive voltage regulator for power systems is proposed. The design of this regulator is based on variable structure control theory. To make the regulator adaptive to the power system operating conditions, an artificial neural network is used. The effect of the proposed regulator has been compared to that of the realistic regulato...
Article
Feasibility study shows that, when operating in the context of weak ac systems, the automatic feedback controls of the HVDC link, based on the Constant Extinction Angle and the Constant Current strategies, may hunt in vain for non-existent equilibrium operating points. This problem can be solved by switching over to the Constant Ignition Angle stra...
Article
Includes abstract in English and French. Thesis (M. Eng.)--McGill University, 1986. Includes bibliographical references.
Article
University Microfilms order no. UMI00372493. Thesis (Ph. D.)--McGill University, 1992. Includes bibliographical references.
Article
Full-text available
One of the principal functions of static var compensators (SVCs) in a transmission system is the voltage control at the point of connection. As power and transmission systems have grown considerably in the last decades, many systems have been interconnected for economic reasons. The use of SVCs became more important as the systems were required to...

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