International Journal of Electrical Power Energy Systems, May 1, 2010
A methodology for the analysis of radial or weakly meshed distribution systems supplying voltage ... more A methodology for the analysis of radial or weakly meshed distribution systems supplying voltage dependent loads is here developed. The solution process is iterative and, at each step, loads are simulated by means of impedances. Therefore, at each iteration, it is necessary to solve a network made up only of impedances; for this kind of network, all the voltages and currents can be expressed as linear functions of a single unknown current (in radial systems) or of two unknown currents for each independent mesh (for meshed systems). The methodology has been called “backward” since the unique equation, in case of radial network, and the linear system of equations, in case of meshed network, in which such unknown currents appear can be determined by starting from the ending nodes of the radial system, or of the radialized network (obtained by means of cuts in meshed networks). After a brief presentation of the b/f method, which is currently the most commonly used technique for solving distribution networks, the solution methodology is detailed both for radial and for meshed systems. Then, the way in which PV nodes can be considered is also described.Finally, the results obtained in the solution of some networks already studied in the literature are presented with other methods, in order to compare their performances.The applications show the efficiency of the proposed methodology in solving distribution networks with many meshes and PV nodes.
18th International Conference and Exhibition on Electricity Distribution (CIRED 2005), 2005
... Giacomo COCCHIARA, Mariano G. IPPOLITO, Giuseppe MORANA Università degli Studi di Palermo - D... more ... Giacomo COCCHIARA, Mariano G. IPPOLITO, Giuseppe MORANA Università degli Studi di Palermo - Department of Electrical Engineering - Italy cocchiara@diepa.unipa.it; ippolito@diepa.unipa.it; morana@diepa.unipa.it INTRODUCTION ... [1] H. Awad, J. Svensson, MHJ ...
SUMMARY The paper develops some technical and economic aspects of a new LC device, called Current... more SUMMARY The paper develops some technical and economic aspects of a new LC device, called Current Pumping Device, that may be employed to improve power quality in low voltage distribution networks fed by inverter. Particularly the paper deals with the main ...
The growing sensibility to environment issues contributed in recent years to the erection of barr... more The growing sensibility to environment issues contributed in recent years to the erection of barriers in the construction of new overhead transmission lines. One of the solutions to overcome these problems was the use of cable lines for high (HV) and extra-high (EHV) voltage systems. However, the coexistence of overhead and cable lines in transmission systems, in the so called ¿mixed¿ lines, has raised a number of issues regarding the behaviour of such systems both in transient and steady-state. In particular, the definition of transient stability is necessary for a system to describe the behaviour respect to events aimed at altering its equilibrium point. The purpose of this study was to investigate the transient stability of single machine infinite bus (SMIB) system containing a mixed overhead-cable line affected by fault: the critical clearing time (CCT) was assumed as stability index. The study has taken under investigation three different cases and was developed through a sen...
2001 IEEE International Conference on Systems, Man and Cybernetics. e-Systems and e-Man for Cybernetics in Cyberspace (Cat.No.01CH37236), 2001
Strategic planning requires the optimisation of many objects. The paper aims at the solution of t... more Strategic planning requires the optimisation of many objects. The paper aims at the solution of this multiobjective optimisation problem using a nondominated sorting genetic algorithm (NSGA)-based approach. Distribution systems design using modular strategical planning indeed requires the minimisation/maximisation of many objects depending on mixed-integer variables. In the paper the concept of modularity has been used in the formulation of the strategical planning of electrical distribution systems. In this way, innovative and more rational design solutions have been identified. Each module represents the topology and behaviour of each part of the distribution system. The entire system has been represented by the combination of one or more modules. Each combination is characterised by a set of functions expressing the installation cost per year and per squared km, the operational cost, the maximum unavailability, the voltage dips and short interruptions and the voltage unbalances due to single-phase loads feed. In this way, the set of parameter values analytically describing the entire system can be identified, these being the set of optimisation variables
Proceedings of the 2004 Congress on Evolutionary Computation (IEEE Cat. No.04TH8753), 2004
Abstract-In this paper, a dynamic MultiObjective, MO, algorithm based on the Ant Colony Search, t... more Abstract-In this paper, a dynamic MultiObjective, MO, algorithm based on the Ant Colony Search, the MultiObjective Ant colony Search Algorithm, MOACS, is presented. The application domain is that of dynamic planning for electrical distribution systems. A time horizon of H ...
IEEE Power Engineering Society General Meeting, 2004., 2004
... Tipologia: Proceedings. Citazione: IPPOLITO MG, SANNINO A, VUINOVICH F, & MORANA G. (2004... more ... Tipologia: Proceedings. Citazione: IPPOLITO MG, SANNINO A, VUINOVICH F, & MORANA G. (2004). ... IEEE PES General Meeting 2004, June 6-10, Denver, Colorado USA.. Autori: IPPOLITO MG; SANNINO A; VUINOVICH F; MORANA G. ...
Proceedings of IEEE International Conference on Systems, Man and Cybernetics, 1994
This paper deals with the conception, construction and simulation of gripping systems for handlin... more This paper deals with the conception, construction and simulation of gripping systems for handling flat non-rigid materials (NRMs). A prototype gripping system dedicated to handle regular shaped flat materials, has been designed, constructed and experimentally tested. In addition two other gripping systems for grasping irregular shaped NRMs have also been designed and simulated through this work. A consistent review in
International Journal of Electrical Power Energy Systems, May 1, 2010
A methodology for the analysis of radial or weakly meshed distribution systems supplying voltage ... more A methodology for the analysis of radial or weakly meshed distribution systems supplying voltage dependent loads is here developed. The solution process is iterative and, at each step, loads are simulated by means of impedances. Therefore, at each iteration, it is necessary to solve a network made up only of impedances; for this kind of network, all the voltages and currents can be expressed as linear functions of a single unknown current (in radial systems) or of two unknown currents for each independent mesh (for meshed systems). The methodology has been called “backward” since the unique equation, in case of radial network, and the linear system of equations, in case of meshed network, in which such unknown currents appear can be determined by starting from the ending nodes of the radial system, or of the radialized network (obtained by means of cuts in meshed networks). After a brief presentation of the b/f method, which is currently the most commonly used technique for solving distribution networks, the solution methodology is detailed both for radial and for meshed systems. Then, the way in which PV nodes can be considered is also described.Finally, the results obtained in the solution of some networks already studied in the literature are presented with other methods, in order to compare their performances.The applications show the efficiency of the proposed methodology in solving distribution networks with many meshes and PV nodes.
18th International Conference and Exhibition on Electricity Distribution (CIRED 2005), 2005
... Giacomo COCCHIARA, Mariano G. IPPOLITO, Giuseppe MORANA Università degli Studi di Palermo - D... more ... Giacomo COCCHIARA, Mariano G. IPPOLITO, Giuseppe MORANA Università degli Studi di Palermo - Department of Electrical Engineering - Italy cocchiara@diepa.unipa.it; ippolito@diepa.unipa.it; morana@diepa.unipa.it INTRODUCTION ... [1] H. Awad, J. Svensson, MHJ ...
SUMMARY The paper develops some technical and economic aspects of a new LC device, called Current... more SUMMARY The paper develops some technical and economic aspects of a new LC device, called Current Pumping Device, that may be employed to improve power quality in low voltage distribution networks fed by inverter. Particularly the paper deals with the main ...
The growing sensibility to environment issues contributed in recent years to the erection of barr... more The growing sensibility to environment issues contributed in recent years to the erection of barriers in the construction of new overhead transmission lines. One of the solutions to overcome these problems was the use of cable lines for high (HV) and extra-high (EHV) voltage systems. However, the coexistence of overhead and cable lines in transmission systems, in the so called ¿mixed¿ lines, has raised a number of issues regarding the behaviour of such systems both in transient and steady-state. In particular, the definition of transient stability is necessary for a system to describe the behaviour respect to events aimed at altering its equilibrium point. The purpose of this study was to investigate the transient stability of single machine infinite bus (SMIB) system containing a mixed overhead-cable line affected by fault: the critical clearing time (CCT) was assumed as stability index. The study has taken under investigation three different cases and was developed through a sen...
2001 IEEE International Conference on Systems, Man and Cybernetics. e-Systems and e-Man for Cybernetics in Cyberspace (Cat.No.01CH37236), 2001
Strategic planning requires the optimisation of many objects. The paper aims at the solution of t... more Strategic planning requires the optimisation of many objects. The paper aims at the solution of this multiobjective optimisation problem using a nondominated sorting genetic algorithm (NSGA)-based approach. Distribution systems design using modular strategical planning indeed requires the minimisation/maximisation of many objects depending on mixed-integer variables. In the paper the concept of modularity has been used in the formulation of the strategical planning of electrical distribution systems. In this way, innovative and more rational design solutions have been identified. Each module represents the topology and behaviour of each part of the distribution system. The entire system has been represented by the combination of one or more modules. Each combination is characterised by a set of functions expressing the installation cost per year and per squared km, the operational cost, the maximum unavailability, the voltage dips and short interruptions and the voltage unbalances due to single-phase loads feed. In this way, the set of parameter values analytically describing the entire system can be identified, these being the set of optimisation variables
Proceedings of the 2004 Congress on Evolutionary Computation (IEEE Cat. No.04TH8753), 2004
Abstract-In this paper, a dynamic MultiObjective, MO, algorithm based on the Ant Colony Search, t... more Abstract-In this paper, a dynamic MultiObjective, MO, algorithm based on the Ant Colony Search, the MultiObjective Ant colony Search Algorithm, MOACS, is presented. The application domain is that of dynamic planning for electrical distribution systems. A time horizon of H ...
IEEE Power Engineering Society General Meeting, 2004., 2004
... Tipologia: Proceedings. Citazione: IPPOLITO MG, SANNINO A, VUINOVICH F, & MORANA G. (2004... more ... Tipologia: Proceedings. Citazione: IPPOLITO MG, SANNINO A, VUINOVICH F, & MORANA G. (2004). ... IEEE PES General Meeting 2004, June 6-10, Denver, Colorado USA.. Autori: IPPOLITO MG; SANNINO A; VUINOVICH F; MORANA G. ...
Proceedings of IEEE International Conference on Systems, Man and Cybernetics, 1994
This paper deals with the conception, construction and simulation of gripping systems for handlin... more This paper deals with the conception, construction and simulation of gripping systems for handling flat non-rigid materials (NRMs). A prototype gripping system dedicated to handle regular shaped flat materials, has been designed, constructed and experimentally tested. In addition two other gripping systems for grasping irregular shaped NRMs have also been designed and simulated through this work. A consistent review in
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Papers by Mariano Ippolito