نتایج جستجو برای: islanding
تعداد نتایج: 763 فیلتر نتایج به سال:
In order to study the influence of system parameters on the stability and dynamic performance of combination-configuration microgrid based on droop control, small-signal model is established at the point of steady state. By calculating the eigenvalues of state matrix, the small-signal stability of combination-configuration microgrid can be directly analyzed. Based on sensitivity analysis, the k...
Abstract There are stability risks after PV plants drop into island operation, especially in case of unintentional islanding caused by grid faults and the islanding-state detection device fails to operate time. In order estimate those risks, firstly, mechanism three factors (power difference, permeability motor inertia) influencing characteristics system a short time unintentionally dropped ope...
The likelihood of an unintentional power system islanding is increased in systems with significant penetration distributed generation. To mitigate the adverse effects islanding, a quick and reliable detection method needed. This paper first analyzes covariance matrices linearized model, relates them to principal component analysis experimentally obtained matrices. Additionally, new model-indepe...
The development and use of PV (Photovoltaic), Wind, Hydro-based Distributed Generation (DG) is presently on the rise worldwide for improving stability reliability, reducing power loss in distribution system with reduced emission harmful gases. A crucial issue addressed this article, due to increased penetration DGs, islanding operations. detection performed by a proposed v&f (voltage freque...
This paper presents an analysis of the anti-islanding protection (AIP) functions behavior during islanded operation a distribution network section that contains simul- taneously distributed generators interfaced by inverters and directly connected to grid via synchronous generator. Through simulations carried out, it was verified tripping time traditional passive islanding detection is signific...
The objective of this paper is to present novel control strategies for MicroGrid operation, especially in islanded mode. The control strategies involve mainly the coordination of secondary load-frequency control by a MicroGrid Central Controller that heads a hierarchical control system able to assure stable and secure operation when the islanding of the MicroGrid occurs and in load-following si...
Many owners of Distributed Resources such as synchronous Industrial Commercial Generators, ICG, are concerned about the requirements for protective relaying when connecting to a local utility even for only a short transfer time of a few seconds when paralleling to test their ICG on a periodic basis. They tend to look at the consequences of just their own ICG trying to serve a much larger utilit...
In islanding, a portion of the power network, comprised of the loads and distributed generation (DG) units, is isolated from the rest of the power grid and forms a micro grid (MG). In this condition, it becomes essential for the islanded MG to operate in a stable and controlled manner by providing ancillary services. When the MG is cut off from the main grid, the islanding must be detected by t...
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