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The availability of fast-reacting frequency-controlled reserves is essential for any Utility to ensure the power system reliability. This paper presents so a concept of coordinated up and down modulation of distributed loads, willing to supply frequency-controlled reserves. These reserves are provided through a structure of Virtual Power Plant (VPP), managed by a multi-agents system. These reserves...
The present paper introduces a method for voltage profile mitigation aiming at solving voltage deviations through LV flexibility activation based on voltage sensitivity analysis in unbalanced LV distribution system. This method aims to help the DSO to benefit of the flexibility available on a given LV network to solve voltage constraints, while minimizing the cost of LV flexibility offer activation...
In this paper, we propose methods for minimizing power losses through dynamic reconfiguration. Two methods for determining the best sequence of configurations, while minimizing the total network losses and reconfiguration cost have been developed. The first method is based on a shortest path algorithm, whereas the second one is based on mixed integer linear programming. The algorithms are tested on...
This paper deals with Benders' Decomposition techniques applied to Volt Var Control algorithms for MV distribution networks. This partitioning technique helps to solve certain classes of Mixed Integer Nonlinear Programming problems with decomposable structure. Therefore, this approach can be applied to the standard case of Volt Var Control algorithms in distribution systems which use continuous and...
The short-circuit computations are usually performed in power system studies to determine currents and voltages in the power grid under fault. The interconnection of Distributed Generation (DG) increases the short-circuit currents and may cause that electric equipments overcome their capacity limits. At the same time, the increment of renewable energy sources and other forms of DG, introduces more...
Societies become more and more demanding regarding the future distribution networks role and functionalities. They will have to be accessible to whole actors and in particularly to renewable energies. They must be economic managing for the best the energy efficiency of the system and the energy politics (competition, deregulation). Finally, they must be reliable in order to satisfy the societal expectations...
This work is related to the protection system of distribution networks. Radial MV distribution grids can be protected by a single relay placed at the beginning of the feeder. But the future operation of distribution grids turning into Smart Grids will surely impose more complex operations. Therefore a more advanced protection scheme could be needed and could include several protection relays on a...
Distribution networks will experience a deep mutation concerning their planning and operation rules due to the expected increase of distributed generation (DG) interconnection to the grid. Indeed, the opening of the electricity market or the growing global concern for environmental issues will lead to a massive development of DGs. Yet, a too large amount of DGs could raise technical problems on distribution...
Nowadays, distribution networks are facing tremendous challenges. Actually, the opening of the energy market, the wish to preserve the environment and the reduction of fossil energy stocks have lead to use more and more distributed, renewable and local energy resources, such as wind and photovoltaic generators. These generating units are mostly connected to the distribution networks. With the increase...
Electrical Distribution Systems (EDS) are facing ever-increased complexity due, in part, to fast growing consumer demands and the integration of large amounts of distributed energy resources. The conventional operation modes need to be adapted to the significant changes. With advanced Information and Communication Technology (ICT) infrastructure and sophisticated new functionalities for energy management,...
Electrical distribution systems (EDS) are undergoing some significant changes at various scales and levels. These changes are triggered by several factors such as the event of distributed energy resources (DER) and the need to improve the quality of supply while achieving economical optima. Hence, several research initiatives, technological development and experiments have been launched worldwide...
The research of weakness ties in graphs such as interconnected electrical transmission grids is a major concern in large infrastructures' studies. Some novel methodologies which are developed in advanced topics of complex systems studies and graph theory may be applied to the electrical grid. Indeed, in order to identify the potential cuts of large interconnected networks such as the interconnected...
Increasing complexity of interconnected electricity grids with a high integration level of dispersed generators leads that ldquobusiness as usualrdquo operating modes and regular devices in distribution networks are not efficient enough to ensure the centralized management of a large amount of information and high-level functionalities (advanced distribution automation-ADA) for future electricity...
This article presents a methodology to assess the most critical components of a given IT&C infrastructure. The focus is especially on the electric network management applications. The steps of this procedure are illustrated in a case study based on an industrial simulation tool performing technical operating tasks in distribution utilities. The obtained criticality hierarchy in our use case is...
Presently, there is a poor knowledge about the coupled systems and their interdependency. Failures caused by cascade effects are increasing and operators' systems do not know how to control adequately the negative consequences on their systems. At the same time, critical infrastructures due to their relevance are potential targets of outlaw groups, ill- disposed people, and terrorist groups. The modeling...
A new type of network namely “Active Network” is foreseen as a relevant evolution of the current passive distribution networks and might be a technically and economically feasible solution to facilitate Decentralized Energy Resources (DERs) interconnections in a deregulated energy market. But one of the difficulties of related studies consists in the small size of Distributed Generator (DGs) and the...
This paper deals with distribution network (DN) reconfiguration for loss minimization. To solve this combinatorial problem, a genetic algorithm (GA) is considered. In order to enhance its ability to explore the solution space, efficient genetic operators are developed. After a survey of the existing DN topology description methods, a theoretical approach based on the graph and matroid theories (graphic...
The major change in the last decade concerning distribution network is related to the penetration of distributed generation (DG). The current practice in France concerning the connection of DG was to fit the network to the worse case of use of DG to avoid any problem. This approach will reach his limits and many developments will be necessary to optimize the network operation, taking the presence...
The security of critical infrastructures, such as power systems, telecommunication networks, information facilities or even emergency and financial services, is a major aspect for our modern societies. One of the main threats is the growing interdependency between them. Failure in one infrastructure may cascade on others. In many infrastructures, it is mainly caused by the increasing complexity of...
Linear programming methods have long been used in optimizing power system problems. Because of the size and complexity of many such problems, a commercial solver may be the fastest, most efficient means of optimization. This paper gives a review of optimization solvers within GAMS and MATLAB, including an overview of their algorithms and some of their main advantages, particularly where large problems...
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