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A recent analysis shows that the mean reason for some major blackouts and failures of a power sys... more A recent analysis shows that the mean reason for some major blackouts and failures of a power system is the voltage-instability problem. The wind-farm power generation has received a considerable attention for its significant impact on the power system voltage stability. The paper discusses the impact of integrating wind farms using doubly-fed induction generators (DFIG) on the western Algerian power-system operation for this proposes. The wind farms have been installed at different buses to determine their best location and to optimize their power. The maximum loading factor in the power system is determined based on the P-V curves. The simulation results obtained by using the Power System Analysis Toolbox (PSAT) show that the wind farms can be effectively used to enhance the static-voltage stability and increase the network loadability margin.

2017 5th International Conference on Electrical Engineering - Boumerdes (ICEE-B)

Transient stability analysis is an indispensible part of utility system planning. At present, it ... more Transient stability analysis is an indispensible part of utility system planning. At present, it still relies on the classical numerical integration methods which are accurate but time consuming for large power systems. This paper proposes Gear's method and the block method to reduce the computational cost. These methods are used to simulate the IEEE 39 Bus system. The classical model representation of the power system is used here. To verify their effectiveness a comparison to Runge-Kutta 4th order method, which is one of the most used methods to solve the problem is done. The Gear and block methods are found to be very accurate with less computational time than the classical Runge-kutta method. The results obtained are conclusive and satisfying.

Revue internationale de génie électrique, 2008

Nous presentons dans cet article une nouvelle formulation du probleme du Dispatching Economique-E... more Nous presentons dans cet article une nouvelle formulation du probleme du Dispatching Economique-Environnemental (DEE) en tenant compte des pertes de transmission. Cette nouvelle formulation est basee sur la transformation du probleme classique du dispatching economique-environnemental, qui est un probleme d'optimisation contraint a ng variables, en un probleme d'optimisation non contraint a (ng-1) variables. Nous avons considere les pertes de transmission actives afin de voir leur influence sur la convergence des resultats optimaux. Les pertes electriques sont successivement exprimees comme constantes et fonction quadratique des puissances produites. Pour l'optimisation, nous nous sommes interesses a appliquer la methode de Hooke et Jeeves sur le reseau standard IEEE 30-bus.

Przeglad Elektrotechniczny

This paper presents the Genetic Algorithms (GA) and Hopfield Neural Network (HNN) to solve the Co... more This paper presents the Genetic Algorithms (GA) and Hopfield Neural Network (HNN) to solve the Combined Economic and Emission Dispatch (CEED) problem. The equality constraints of power balance and the inequality generator capacity constraints are considered. The CEED problem is a bi-objective non linear optimization problem since it is obtained by considering both the economy and emission objectives. This bi-objectives problem is converted into a single objective function using a price penalty factor approach. In this paper AG and HNN are tested on six generators system and the results are compared. The solutions are quite encouraging and useful in the CEED.

Przeglad Elektrotechniczny, Dec 22, 2010

ABSTRACT The Harmony Search Algorithm (HSA) is a newly developed meta-heuristic that uses a stoch... more ABSTRACT The Harmony Search Algorithm (HSA) is a newly developed meta-heuristic that uses a stochastic random search. The HSA is simple in concept, few in parameters and easy in implementation. Moreover, it does not require any derivative information. These features increase the applicability of the HSA, particularly in power system applications, where the problems have a large amount of variables and constraints. In this paper, a Fast method based on Harmony Search Algorithm (FHSA) for solving Economic Dispatch (ED) problem is proposed. The performance of FHSA is investigated and compared with HSA, Improved HSA (IHSA), Global HSA (GHSA) and Matpower method. Numerical results reveal that FHSA can find optimum solutions with reduced number of “improvisations” when compared to the other methods.

Journal of Information Science and Engineering, 2008

The Economic Dispatch Problem (EDP) is one of the important optimization problem in a power syste... more The Economic Dispatch Problem (EDP) is one of the important optimization problem in a power system. Traditionally, in EDP, the cost function for each generator has been approximately represented by a single quadratic function. The main aim of EDP is to minimize the total cost of generating real power while satisfying the equality constraints of power balance and the inequality generator capacity constraints. In this paper a New Economic Dispatch Problem Formulation (NEDPF) has been proposed to solve EDP. This new formulation is based on the reduction of the number of variables (number of generators) and elimination of the equality and inequality constraints, thus the transformation of the constrained non linear programming problem to an unconstrained one. The new unconstrained objective function, is minimized by Hooke-Jeeves' method. The NEDPF was tested for different cases (2, 3 and 6 generator units) and the results are judged satisfactory.

Acta Polytechnica Hungarica, Dec 22, 2011

In this paper, we investigate the effect of the injection of wind farm energy in the western Alge... more In this paper, we investigate the effect of the injection of wind farm energy in the western Algerian electrical power system on Dynamic Economic Dispatch (DED). DED is solved by Harmony Search algorithm (HS). HS is a newly-developed meta-heuristic algorithm that uses a stochastic random search. It is simple in concept, few in parameters and easy in implementation. The simulations are realized by considering first the western Algerian power system as it is (WA: 2003 data), then the western Algerian electrical power system with the injection of wind farm energy (Western Algerian power system + Wind energy WAW). The results are compared in production cost and harmful emissions (CO 2). After a theoretical introduction of the problem formulation and the harmony search algorithm, a description of the site and the wind farm is presented, followed by a discussion of the simulation results.

This paper presents a new approach for solving the combined economic and emission dispatch proble... more This paper presents a new approach for solving the combined economic and emission dispatch problem under some equality and inequality constraints. The equality constraints reflect a real power balance, and the inequality constraints reflect the limits of real generation. The voltage levels and security are assumed to be constant. The problem is solved by a Sequential Unconstrained Minimization Technique (SUMT) algorithm which was developed by Fiacco and McCormick. Combined economic emission dispatch problem is obtained by considering both the economy and emission objectives. This bi-objective problem is converted into a single objective function using a price penalty factor. In this paper SUMT method is tested on three generators system and its results are compared with the solutions obtained in [1]. The results are quite encouraging and useful in the economic emission environment.

L’étude de la stabilité transitoire est une tâche fondamentale car l’évaluation rapide de celle-c... more L’étude de la stabilité transitoire est une tâche fondamentale car l’évaluation rapide de celle-ci est une exigence importante pour l’évaluation du comportement dynamique des réseaux électriques. Ce comportement est décrit par des équations différentielles dont la résolution nécessite la résolution du problème de l’écoulement de puissance pour la détermination des conditions initiales. Différentes méthodes, comme la méthode de Gauss-Seidel, de Newton-Raphson et de Newton-Raphson découplée rapide sont utilisées pour résoudre le problème de l’écoulement de puissance. Des informations dans le domaine des études de la stabilité peuvent être aussi connues en appliquant la théorie des catastrophes. Cette dernière détermine la zone de stabilité dans le plan de contrôle du système, montrant que si le point opérationnel se déplace en dehors de la limite de la stabilité qui est déterminée par la théorie des catastrophes, le système doit être instable et vice-versa. L’estimation du temps d’éli...

International Journal of Electrical Power & Energy Systems

The Spiral Optimization Algorithm (SOA) is an optimization technique developed recently (2011) by... more The Spiral Optimization Algorithm (SOA) is an optimization technique developed recently (2011) by K. Tamura and K. Yasuda at Tokyo Metropolitan University-Japan. SOA is a metaheuristic based on an analogy of spiral phenomena in nature and it is simple in concept, few in parameters and easy in implementation. In this paper, SOA is proposed for solving the Combined Economic and Emission Dispatch (CEED) problem. It is aimed, in the CEED problem, that scheduling of generators should operate with both minimum fuel costs and emission levels, simultaneously, while satisfying the load demand and operational constraints. The CEED problem is formulated as a multi-objective problem by considering the fuel cost and emission objectives of generating units. The bi-objective optimization problem is converted into a single objective function using a price penalty factor. The proposed algorithm has been implemented on three test systems with 3, 6, and 40 generating units, with different constraints ...

The Galaxy-based Search Algorithm (GbSA)is an optimization technique developed recently by Hamed ... more The Galaxy-based Search Algorithm (GbSA)is an optimization technique developed recently by Hamed Shah-Hosseini at Shahid Beheshti University-Iran [1, 2]. GbSA is a meta-heuristic that uses a modified Hill Climbing algorithm as a local search and resembles the spiral arms of some galaxies to search the optimum. In this paper, GbSA is proposed for solving the Combined Economic and Emission Dispatch (CEED) problem under some equality and inequality constraints. The equality constraints are the active power flow balance equations, while the inequality constraints are the minimum and maximum power output of each unit. The voltage levels and security are assumed to be constant. The CEED problem is obtained by considering both the economy and emission objectives. This bi-objective problem is converted into a single objective function using a price penalty factor. The validity of GbSA is tested on two samplesystems and the results are compared to those reported in the recent literature. The...

Przeglad Elektrotechniczny

This paper presents an application of Harmony Search algorithm (HSA) to solve the Dynamic Economi... more This paper presents an application of Harmony Search algorithm (HSA) to solve the Dynamic Economic-Environmental Dispatch (DEED) problem under some equality and inequality constraints. The equality constraints reflect a real power balance, and the inequality constraint reflects the limits of real generation. The voltage levels and security are assumed to be constant. Dynamic Economic-Environmental Dispatch problem is obtained by considering both the economy and emission objectives. This bi-objective problem is converted into a single objective function using a price penalty factor. Harmony Search algorithm is tested on six generators system and its results are compared with the solutions obtained in paper of Keerati. The results are quite encouraging and useful in the economic emission environment. Streszczenie. Zbadano zastosowanie algorytmu HSA do rozwiązania problemów dynamicznego rozsyłu energii. Uwzględniono realny balans mocy jak i realne ograniczenia. Algorytm przetestowano n...

A recent analysis shows that the mean reason for some major blackouts and failures of a power sys... more A recent analysis shows that the mean reason for some major blackouts and failures of a power system is the voltage-instability problem. The wind-farm power generation has received a considerable attention for its significant impact on the power system voltage stability. The paper discusses the impact of integrating wind farms using doubly-fed induction generators (DFIG) on the western Algerian power-system operation for this proposes. The wind farms have been installed at different buses to determine their best location and to optimize their power. The maximum loading factor in the power system is determined based on the P-V curves. The simulation results obtained by using the Power System Analysis Toolbox (PSAT) show that the wind farms can be effectively used to enhance the static-voltage stability and increase the network loadability margin.

2017 5th International Conference on Electrical Engineering - Boumerdes (ICEE-B)

Transient stability analysis is an indispensible part of utility system planning. At present, it ... more Transient stability analysis is an indispensible part of utility system planning. At present, it still relies on the classical numerical integration methods which are accurate but time consuming for large power systems. This paper proposes Gear's method and the block method to reduce the computational cost. These methods are used to simulate the IEEE 39 Bus system. The classical model representation of the power system is used here. To verify their effectiveness a comparison to Runge-Kutta 4th order method, which is one of the most used methods to solve the problem is done. The Gear and block methods are found to be very accurate with less computational time than the classical Runge-kutta method. The results obtained are conclusive and satisfying.

Revue internationale de génie électrique, 2008

Nous presentons dans cet article une nouvelle formulation du probleme du Dispatching Economique-E... more Nous presentons dans cet article une nouvelle formulation du probleme du Dispatching Economique-Environnemental (DEE) en tenant compte des pertes de transmission. Cette nouvelle formulation est basee sur la transformation du probleme classique du dispatching economique-environnemental, qui est un probleme d'optimisation contraint a ng variables, en un probleme d'optimisation non contraint a (ng-1) variables. Nous avons considere les pertes de transmission actives afin de voir leur influence sur la convergence des resultats optimaux. Les pertes electriques sont successivement exprimees comme constantes et fonction quadratique des puissances produites. Pour l'optimisation, nous nous sommes interesses a appliquer la methode de Hooke et Jeeves sur le reseau standard IEEE 30-bus.

Przeglad Elektrotechniczny

This paper presents the Genetic Algorithms (GA) and Hopfield Neural Network (HNN) to solve the Co... more This paper presents the Genetic Algorithms (GA) and Hopfield Neural Network (HNN) to solve the Combined Economic and Emission Dispatch (CEED) problem. The equality constraints of power balance and the inequality generator capacity constraints are considered. The CEED problem is a bi-objective non linear optimization problem since it is obtained by considering both the economy and emission objectives. This bi-objectives problem is converted into a single objective function using a price penalty factor approach. In this paper AG and HNN are tested on six generators system and the results are compared. The solutions are quite encouraging and useful in the CEED.

Przeglad Elektrotechniczny, Dec 22, 2010

ABSTRACT The Harmony Search Algorithm (HSA) is a newly developed meta-heuristic that uses a stoch... more ABSTRACT The Harmony Search Algorithm (HSA) is a newly developed meta-heuristic that uses a stochastic random search. The HSA is simple in concept, few in parameters and easy in implementation. Moreover, it does not require any derivative information. These features increase the applicability of the HSA, particularly in power system applications, where the problems have a large amount of variables and constraints. In this paper, a Fast method based on Harmony Search Algorithm (FHSA) for solving Economic Dispatch (ED) problem is proposed. The performance of FHSA is investigated and compared with HSA, Improved HSA (IHSA), Global HSA (GHSA) and Matpower method. Numerical results reveal that FHSA can find optimum solutions with reduced number of “improvisations” when compared to the other methods.

Journal of Information Science and Engineering, 2008

The Economic Dispatch Problem (EDP) is one of the important optimization problem in a power syste... more The Economic Dispatch Problem (EDP) is one of the important optimization problem in a power system. Traditionally, in EDP, the cost function for each generator has been approximately represented by a single quadratic function. The main aim of EDP is to minimize the total cost of generating real power while satisfying the equality constraints of power balance and the inequality generator capacity constraints. In this paper a New Economic Dispatch Problem Formulation (NEDPF) has been proposed to solve EDP. This new formulation is based on the reduction of the number of variables (number of generators) and elimination of the equality and inequality constraints, thus the transformation of the constrained non linear programming problem to an unconstrained one. The new unconstrained objective function, is minimized by Hooke-Jeeves' method. The NEDPF was tested for different cases (2, 3 and 6 generator units) and the results are judged satisfactory.

Acta Polytechnica Hungarica, Dec 22, 2011

In this paper, we investigate the effect of the injection of wind farm energy in the western Alge... more In this paper, we investigate the effect of the injection of wind farm energy in the western Algerian electrical power system on Dynamic Economic Dispatch (DED). DED is solved by Harmony Search algorithm (HS). HS is a newly-developed meta-heuristic algorithm that uses a stochastic random search. It is simple in concept, few in parameters and easy in implementation. The simulations are realized by considering first the western Algerian power system as it is (WA: 2003 data), then the western Algerian electrical power system with the injection of wind farm energy (Western Algerian power system + Wind energy WAW). The results are compared in production cost and harmful emissions (CO 2). After a theoretical introduction of the problem formulation and the harmony search algorithm, a description of the site and the wind farm is presented, followed by a discussion of the simulation results.

This paper presents a new approach for solving the combined economic and emission dispatch proble... more This paper presents a new approach for solving the combined economic and emission dispatch problem under some equality and inequality constraints. The equality constraints reflect a real power balance, and the inequality constraints reflect the limits of real generation. The voltage levels and security are assumed to be constant. The problem is solved by a Sequential Unconstrained Minimization Technique (SUMT) algorithm which was developed by Fiacco and McCormick. Combined economic emission dispatch problem is obtained by considering both the economy and emission objectives. This bi-objective problem is converted into a single objective function using a price penalty factor. In this paper SUMT method is tested on three generators system and its results are compared with the solutions obtained in [1]. The results are quite encouraging and useful in the economic emission environment.

L’étude de la stabilité transitoire est une tâche fondamentale car l’évaluation rapide de celle-c... more L’étude de la stabilité transitoire est une tâche fondamentale car l’évaluation rapide de celle-ci est une exigence importante pour l’évaluation du comportement dynamique des réseaux électriques. Ce comportement est décrit par des équations différentielles dont la résolution nécessite la résolution du problème de l’écoulement de puissance pour la détermination des conditions initiales. Différentes méthodes, comme la méthode de Gauss-Seidel, de Newton-Raphson et de Newton-Raphson découplée rapide sont utilisées pour résoudre le problème de l’écoulement de puissance. Des informations dans le domaine des études de la stabilité peuvent être aussi connues en appliquant la théorie des catastrophes. Cette dernière détermine la zone de stabilité dans le plan de contrôle du système, montrant que si le point opérationnel se déplace en dehors de la limite de la stabilité qui est déterminée par la théorie des catastrophes, le système doit être instable et vice-versa. L’estimation du temps d’éli...

International Journal of Electrical Power & Energy Systems

The Spiral Optimization Algorithm (SOA) is an optimization technique developed recently (2011) by... more The Spiral Optimization Algorithm (SOA) is an optimization technique developed recently (2011) by K. Tamura and K. Yasuda at Tokyo Metropolitan University-Japan. SOA is a metaheuristic based on an analogy of spiral phenomena in nature and it is simple in concept, few in parameters and easy in implementation. In this paper, SOA is proposed for solving the Combined Economic and Emission Dispatch (CEED) problem. It is aimed, in the CEED problem, that scheduling of generators should operate with both minimum fuel costs and emission levels, simultaneously, while satisfying the load demand and operational constraints. The CEED problem is formulated as a multi-objective problem by considering the fuel cost and emission objectives of generating units. The bi-objective optimization problem is converted into a single objective function using a price penalty factor. The proposed algorithm has been implemented on three test systems with 3, 6, and 40 generating units, with different constraints ...

The Galaxy-based Search Algorithm (GbSA)is an optimization technique developed recently by Hamed ... more The Galaxy-based Search Algorithm (GbSA)is an optimization technique developed recently by Hamed Shah-Hosseini at Shahid Beheshti University-Iran [1, 2]. GbSA is a meta-heuristic that uses a modified Hill Climbing algorithm as a local search and resembles the spiral arms of some galaxies to search the optimum. In this paper, GbSA is proposed for solving the Combined Economic and Emission Dispatch (CEED) problem under some equality and inequality constraints. The equality constraints are the active power flow balance equations, while the inequality constraints are the minimum and maximum power output of each unit. The voltage levels and security are assumed to be constant. The CEED problem is obtained by considering both the economy and emission objectives. This bi-objective problem is converted into a single objective function using a price penalty factor. The validity of GbSA is tested on two samplesystems and the results are compared to those reported in the recent literature. The...

Przeglad Elektrotechniczny

This paper presents an application of Harmony Search algorithm (HSA) to solve the Dynamic Economi... more This paper presents an application of Harmony Search algorithm (HSA) to solve the Dynamic Economic-Environmental Dispatch (DEED) problem under some equality and inequality constraints. The equality constraints reflect a real power balance, and the inequality constraint reflects the limits of real generation. The voltage levels and security are assumed to be constant. Dynamic Economic-Environmental Dispatch problem is obtained by considering both the economy and emission objectives. This bi-objective problem is converted into a single objective function using a price penalty factor. Harmony Search algorithm is tested on six generators system and its results are compared with the solutions obtained in paper of Keerati. The results are quite encouraging and useful in the economic emission environment. Streszczenie. Zbadano zastosowanie algorytmu HSA do rozwiązania problemów dynamicznego rozsyłu energii. Uwzględniono realny balans mocy jak i realne ograniczenia. Algorytm przetestowano n...