Utility power systems are faced to an increasing number of small size producers requiring interconnection particularly the low voltage (LV) network. Since most distribution not designed "receive" large scale injections, these generation units may impact networks specifically in terms quality energy delivered, reliability and safety whole system from LV medium (MV) levels. In this paper, a methodology, based on parametric study, is proposed investigate distributed (DG) impacts when...

Power flows in transmission networks are driven by the structure of network and spatial distribution generators loads. Understanding interplay between grid, generators, loads is crucial for efficient robust planning management electrical networks. Using spectral properties graph Laplacian, we show that can express power on basis Laplacian eigenvectors reveal dominant modes nodal voltages branch powers. The bus dominated low rank modes. lines depends generators/loads, line impedances,...

This work presents a new approach to model the dynamic behaviour of supercapacitors using half-order systems. The is determined in frequency domain but Matlab can be use simulating voltage response and energy efficiency e,g. for automotive power.

The large-scale deployment of distributed generation including intermittent renewable energy sources introduces several challenges to power systems operation and planning. Although often evolve in a fairly incremental way meet these challenges, the ambitious objectives for RES development next decades (2030–2050), together with storage options active demand, indicate that more essential paradigm change shift may be required. This study presents future state art research works new concepts...

Non-integer-order systems are used to model diffusion in conductive parts of electrical machines as they lead more compact knowledge models and also improve their precision. In this paper, a linear half-order impedance ferromagnetic sheet deduced from the magnetic field is briefly introduced. Then, physical considerations finite-element simulation, nonlinear proposed, taking into account both saturation effects. Next, it has been proved that can be successfully included equivalent circuits...

Utility power systems are faced to an increasing number of small size producers requiring interconnection, particularly the low voltage (LV) network. Since most distribution not designed accept large scale injections, these generation units may impact on their interconnected networks. The quality supplied energy be altered, and reliability safety whole system from LV medium (MV) levels affected. aim this paper is establish a new methodology find best location for remotely controlled...

In this paper, a new HVDC power supply system for light rail systems is presented and compared to classical distribution networks based on AC/DC controlled converters. A simulation tool has been developed simulate such complex system, taking into account vehicle motion electrical distribution. Then, an optimization of structure control will be using Lagrangian formulation. All the results are distributions, show effectiveness proposed used systems.

In the last two decades, electricity grids have faced many challenges that they were not designed to handle. These include integrating weather-dependent renewables, distributed generators, storage units and other advanced components, as well taking into account active demand. challenges, together with ageing of infrastructures, make it more difficult deliver cost-effective, reliable power. To overcome these issues requires creating new network architectures. The research project Fractal Grid...

The flowing of induced currents in electric machines, especially the dampers synchronous implies an increase order equivalent circuits used to model their frequency response. But physical meanings circuit parameters are often lost. Thus, authors propose come back over modeling skin effect and define noninteger which would accurately physically represent development currents. In this paper, theoretical basis approach is presented. Then, half-order a turbine generator given.

The increasing number of power electronic converters connected to aircraft electrical supply networks increases the harmonic levels. Conventional filter design is not well adapted many converters, since their behaviour strongly coupled with values. This paper proposes a methodology optimize passive input and fulfil factor standards. method applied diode rectifier, capacitive load, which represents very common stage for actuators.

Improving the braking energy recovery efficiency in light rail systems can reduce their consumption. In order to compare and quantify contribution of different technologies with respect traditional systems, a quasi-static decoupled load flow modelling power supply network AC-DC converters has been developed by authors. It uses an empiric model uncontrolled rectifiers based on abacuses determined simulation.

Purpose The purpose of this paper is to describe an optimization methodology based on a mixed (analytical‐numerical) design model and evolutionary algorithms. Design/methodology/approach In paper, optimal sizing used the new architecture embedded electrical system. An approach presented for defining specifications method modeling network. This will enable problem be set. Findings shows that proposed useful It illustrated by its application aircraft power channel (auto‐transformer‐rectifier...

This paper presents a methodology which allows to obtain time domain response of synchronous generator modelled by the half-order systems. The machine is connected an electrical network composed RL circuit. From Park d-q axis equivalent circuit containing impedances transmittances, state space equation system has been built. Then, using Grünwald-Letnikov approximation derivatives, equations have solved program written in Matlab <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Smart grids are new complex systems used for the optimal delivery of electricity. Their study and design require a better understanding interactions between their topological structure performance. It is proved that power self-similar can be characterized by spectral dimension. The effects scale invariance on frequency response networks shown at intermediate frequencies. Impacts wideband dynamic equivalent modeling finally explored. Two IEEE test cases numerical verifications results.

The ever increasing complexity of power systems mandates a further improvement the numerical methods used for their simulation. We propose new approach that is inspired by an exact analogy with quantum mechanics, but requires no specific knowledge physics. This allows in particular to use local commonly applied such as Lanczos' algorithm. It computing load flow and extended simple dynamic studies where nodes are described swing equations. first set results ideal 2D-lattice grid illustrate...

Purpose Static converters generate current harmonics in power grids. For numerous studies, analytical frequency modeling is preferred to carry out their harmonic the context of sizing by optimization. However, a design optimization has consider other constraints, e.g. constraints and operating constraints. In this way, paper aims focus on applying an aircraft electrical channel. Design/methodology/approach The size multiphysical system channel been carried out. models all components are...

The recent evolution of aircraft power networks makes new design study necessary for solving key issues such as optimal efficiency, reliability, adaptability and performances. Indeed, DC systems are subject to strong dynamic interactions between the source loads. In this paper, need a method network is explained, authors propose use robust performance analysis method. first main result concerns robustness classical where parameters bus unknown. second one shows efficiency evaluate potential...

Non integer order systems are used to model diffusion in conductive parts of electrical machines as they lead more compact and knowledge models but also improve their precision. Nevertheless, non have been established under linear conditions. It is than interesting study the influence saturation on such parameters. In this article, a half-order impedance ferromagnetic sheet deduced from magnetic field introduced. Then, proposed. finally validated by performing 3D finite element simulations...

Power electronics converters can generate a high level of harmonic perturbations on on-board electrical systems (planes, ships, road vehicles…). For the optimal sizing these systems, harmonics must be known to select best components (generator, filter…) that will limit their effects. In paper, an analytical frequency domain modeling is proposed accurately compute generated static converters. Because no numerical simulation used, presented approach fast, accurate and applicable for or...

Power transmission blackouts, have large technical, economic, and social consequences in the affected areas. As power systems evolve with new customs, technologies regulations, continuous analysis of recent blackouts is crucial for identifying trends updating prevention measures.In this paper, we analyze 9 major that happened between 2005 2016, to complete previous blackout studies. We classify these depending on conditions events before during cascades identify their main characteristics....

Purpose Due to the increase of traffic, issues are appearing on DC electrified railway feeding systems. One candidate solution solve these and improve their performances is add storage systems in electrical network. The paper presents a method based an Optimal Power Flow (OPF) for analysis design with storage. Design/methodology/approach describes new methodology optimization study railways, including A load flow model 1500V electrification system presented, mobility train sets. Then,...