1,721,243 research outputs found
Penetration Level Assessment of Distributed Generation by means of Genetic Algorithms
No full textThe large amount of Distributed Generation (DG), that
will be installed in the near future, drastically changes the
behaviour of the typical passive MV distribution network.
If it is not correctly applied, it can cause degradation of
power quality, reliability and control of the power system,
vanishing the advantages it can introduce. This context
determines the need of new tools that help the planner to
correctly evaluate the DG impact on the distribution
network and to find the best size and location of the DG
for feeder voltage support and loss reduction. For these
reasons, the paper proposes a software procedure, based
on a Genetic Algorithm, able to establish the optimal
distributed generation allocation on an existing MV
distribution network, considering all technical constraints
like feeder capacity limits, feeder voltage profile and
three-phase short circuit current. The objective function
implemented includes among its terms the costs of buying
energy from the transmission system and from the DG
units. This allows assessing the more convenient
penetration level of DG in a distribution network.
Application examples are presented to illustrate the
algorithm effectiveness
Performance Metrics For Renewable Energy Communities
No full textEnergy communities have been defined in recent European directives and are being integrated into the Italian regulatory framework. They present themselves as an innovative entity in the national and international energy landscape capable of contributing to the energy transition process through locally produced energy, its self-consumption and sharing with energy community users. Local energy communities are considered an empowerment tool for end users who take charge of the distributed production and management of the energy asset, but in order for the energy asset to be put to its best, most efficient and effective use, it is necessary to develop key performance indices that are also easily understood by community members, whether they are elderly, young people, private companies, public entities, etc., and to which it is immediate to react with proactive behaviour in order to maximize their economic benefits, which, of course, translate locally into environmental and social benefits. In this context, the manuscript presents some performance indices that can be used to achieve the above goals. An energy community case study is discussed to show the purpose and usefulness of the proposed metrics
Optimal coordination of a pool of different EV charging stations
No full textThe transport sector will contribute to the decarbonisation goals by massively replacing internal combustion engine vehicles with electric vehicles (EVs). In Europe, up to 70 million EVs are expected by 2030. The diffusion of EVs will be accompanied by 50-70 million charging points connected to the distribution systems (at medium and low voltage levels). The EV charging causes power quality and operation issues, such as line overloading, voltage violations, and voltage unbalances. It will require extensive investments to develop a distribution system suited to face the electrification of heating and transportation. Using suitable control systems for optimal charging that consider charging session features and network criticalities can mitigate the impact of EVs on distribution grids and contribute to postponing or even avoiding significant investments. The paper proposes a strategy to reduce the effects of public charging on low-voltage networks. If already burdened by the increased electrification of end-use consumption and domestic vehicle charging, these networks are susceptible to significant voltage drops or overcurrents. The proposed strategy involves developing a signalling system that informs vehicle owners whether a charging station can guarantee a full charge based on current grid conditions. An Italian LV unbalanced network and charging habits in parking lots derived from the latest literature are used to demonstrate the effectiveness of the proposed approach
A Distributed Parameter Model for Grounding Systems in the PSCAD/EMTDC Environment
No full textABSTRACT: The study of grounding system behavior under lightning condition is a very hard problem to handle. The high frequencies that characterize the lightning phenomena require the use of distributed parameter models instead of lumped parameter ones. This fact makes hard to model and simulate complex earth system architectures and complete power system circuits. Aim of the paper is to develop a distributed parameter model to be implemented in an electromagnetic transients simulator (PSCAD/EMTDC), simple to use in different electric circuits in order to study lightning effects on power system. Computed results are compared to published experimental ones and to those obtained by different models reported in literature
Smartgrid: Il contributo del CIRED. Ricerca sulle reti elettriche di distribuzione – Sessione 1: Componenti di rete
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