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277 results on '"Dusonchet L"'

20. Optimal reconfiguration of weakly meshed distribution systems

Author

Augugliaro, A., Dusonchet, L., Salvatore FAVUZZA, Ippolito, M. G., Riva Sanseverino, E., Augugliaro, A, Dusonchet, L, Favuzza, S, Ippolito, M G, and Riva Sanseverino, E

Subjects
Settore ING-IND/33 - Sistemi Elettrici Per L'Energia, Electrical power system, Meshed system, Power losses
Abstract

In this paper the problem of optimal reconfiguration for weakly meshed systems is dealt with; meshes are created by the presence of Favoured Customers (FC) requiring supply through two different paths in order to guarantee the maximum service continuity. Aim of the reconfiguration is to attain a network that operates with minimum power losses, and in order to account for particular needs of the FC loads, that shows the minimum overall yearly fault rate on the branches where the power required by the loads flows. Moreover the constraints concerning the bus voltage profiles, the current in branches and the power balance among HV/MV transformers supplying the network must be full-filled. Due to the intrinsic nature of the problem, for its solution a Genetic Algorithm has been adopted creating some perturbation operators that, differently from existing and well-known perturbation operators, allows to widely explore the search space still keeping the feasibility of solutions.

Published
2011

21. A Backward Method for Solving PV Nodes in Weakly Meshed Distribution Networks

Author

Augugliaro, A., Dusonchet, L., Salvatore FAVUZZA, Ippolito, M. G., Sanseverino, E. R., Augugliaro, A., Dusonchet, L., Favuzza, S., Ippolito, M., and RIVA SANSEVERINO, E.

Subjects
Settore ING-IND/33 - Sistemi Elettrici Per L'Energia, Backward/forward methods, distribution networks, load flow
Abstract

In this paper, a new iterative backward/forward methodology for the load flow solution of weakly meshed systems with fixed voltage nodes is presented. Such technique models the loads at each iteration by means of impedances, and the PV nodes by means of reactances. Each iteration is organised in two steps. In the first, the radial network attained from the meshed system through cuts and composed of shunt and series impedances is solved. In the second step, based on a reduced Thévenin impedance matrix, the compensation currents to be injected in the cut nodes are deduced. Modelling the PV nodes by means of reactances allows the attainment, for the reactive power of these nodes, of the same precision that it is possible to get solving the network with the methods usually adopted for transmission networks. After the presentation of the different implementations of the backward/forward method proposed in the literature, the new technique and the relevant implementation are presented in detail. The methodology allows the solution of systems with meshes and PV nodes; test results show precision, speed and good convergence properties.

Published
2007

28. Voltage Collapse Proximity Assessment for Radial Distribution Networks

Author

Augugliaro, A., Dusonchet, L., Salvatore FAVUZZA, Mangione, S., AUGUGLIARO, A, DUSONCHET, L, FAVUZZA, S, and MANGIONE, S

Subjects
Settore ING-IND/33 - Sistemi Elettrici Per L'Energia, Radial distribution network, voltage stability, voltage collapse proximity, critical power
Abstract

The paper deals with voltage stability assessment in radial distribution networks. The voltage collapse proximity index already utilized in literature for power transmission systems is assumed. Based on the optimal impedance solution of a two-bus equivalent system, this index indicates how far the load nodes of the actual network are from their voltage collapse points, allowing the weak node and its maximum load power beyond which voltage collapse takes place to be identified. The proposed method differs from the other methods on the determination of the parameters which define the two-bus equivalent of the network, allowing to better identify the maximum loading point beyond which the voltage collapse takes place in the network. Simulation results show that the proposed method is significantly more accurate than other existing methods on evaluating the critical power at a particular node (i.e. the weak node of the network) starting from any operating point, with smaller errors between actual and predicted values.

Published
2005

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