Evaluating the contribution of system control to the reliability of the power system. II

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Amid profound transformations in the global energy landscape, the restructuring of electricity sectors has become a central element of national strategies to accelerate the growing integration of renewable energy sources (RES) into the power system. In parallel, the liberalization of the electricity industry in the 1990s has led to a significant transformation of this sector, rearranging the vertically integrated supply model into a market-regulated system. This has resulted in an increased need for flexibl

In Part-I, we presented an optimal day-ahead scheduling scheme for dispatching active distribution networks accounting for the flexibility provided by electric vehicle charging stations (EVCSs) and other controllable resources such as battery energy storage systems (BESSs). Part-II presents the intra-day control layer for tracking the dispatch plan computed from the day-ahead scheduling stage. The control problem is formulated as model predictive control (MPC) with an objective to track the dispatch plan se

Programming by Demonstration (PbD) offers a user-friendly way of skill transfer from human to robot. Typically, demonstration data do not contain the control inputs required to reproduce the demonstrated skill. These control commands can be obtained from a low-level controller tracking the movement dynamics of the skill. Both the generation of the reference signal and the selection of the low-level controller are critical for reproduction. In this work we present a low-level controller with a minimal interv

This work is unique as it provides a uniform treatment of the Fourier theories of functions (Fourier transforms and series, z-transforms), finite measures (characteristic functions, convergence in distribution), and stochastic processes (including arma series and point processes). It emphasises the links between these three themes. The chapter on the Fourier theory of point processes and signals structured by point processes is a novel addition to the literature on Fourier analysis of stochastic processes.

In our research we use the technology of electrochromic (EC) glazing to maximize the use of daylight and minimize the energy consumption in buildings while preserving visual and thermal comfort of the users. We propose an advanced automatic control of EC windows coupled with an anidolic daylighting system (ADS), blinds and dimmable fluorescent lights. EC windows with a visible transmittance range (Tv) of 0.15 – 0.50 were installed on the southern façade of an office room of the LESO experimental building (E

In spring 2013, the Edipo facility of CRPP was commissioned. The dipole is powered via two 18 kA HTS current leads, designed and manufactured at CRPP. As part of the Edipo commissioning framework, the operational parameters of the leads were implemented in the control system. The in-situ tests were found to be in good agreement with the tests performed without a background field in 2011. The leads consist of a conduction cooled HTS module, made of AgMgAu/Bi-2223 stacks, and a wire bundle heat exchanger. The

The loss of feedback linearizability of control systems is studied when restricted to a submanifold of the state-space. The slow approximation of singularly perturbed systems also falls into this category. We show that even if the static-feedback linearizability is lost, the flatness property of the system may be conserved. The comparison between a flexibly linked pendulum and a rigidly linked one, both equipped with two controls and evolving in the plane, illustrates the theoretical results.

The Inertia Wheel Assembly (IWA) is composed by the IWA motor, the inertia wheel and the command electronics. IWA belongs to the Attitude Determination and Control System (ADCS) of the SwissCube satellite. Swisscube is a pico-satellite that complies with CubeSat specifications. It will be the first satellite entirely developed by students at EPFL. Its principal characteristics are the dimension, 10x10x10 cm and weight, 1Kg. The objective of this project is to develop a low power electronic equipment able to

A new MATLAB toolbox for computing eigenvalues and invariant subspaces of Hamiltonian and skew-Hamiltonian matrices is described. Based on orthogonal symplectic decompositions, the implemented algorithms are both numerically backward stable and structure-preserving. It will be demonstrated how this toolbox can be used to address a number of tasks in systems and control theory, including some model reduction methods and the computation of the H ∞ norm. © 2005 IEEE.

In order to define a real-world model problem for research work in the area of predictable assembly of certifiable software components, this paper introduces the substation automation domain, as a representative for the wide spectrum of data acquisition and process control systems. Special emphasis in the paper is put on those aspects of the application area, which make its employment as a model problem provider attractive. First, the compositions are required to meet several well defined quality requiremen

The original TCV control system was designed in the late 1980s to be inherently network based in that all control operations were performed from X-windows terminals and the control computers were networked. Using VMS-VAX technology, the acquisition system (CAMAC) and control system (BITBUS) were connected to controllers situated in the machine bus of these machines that were linked homogeneously by the VMS 'cluster' technology. Although the computing power and network bandwidth have improved considerably ov

A review, with 17 refs., on research carried out by the polymer reaction engineering group at EPFL in reaction engineering, including kinetic modeling of polymn. reactions (lab. and pilot scale reactors), free radical, polyepoxydation, polycondensation. Development, scale-up and optimization of continuous polymn. processes, in-line sensors for polymn. process control are discussed. Polymn. reactions, including polymn. initiated by multifunctional initiators and polymn. under supercrit. conditions are also d

This paper presents an account of the current state of sampling, 50 years after Shannon's formulation of the sampling theorem. The emphasis is on regular sampling where the grid is uniform. This topic has benefited from a strong research revival during the past few years, thanks in part to the mathematical connections that were made with wavelet theory. To introduce the reader to the modern, Hilbert-space formulation, we re-interpret Shannon's sampling procedure as an orthogonal projection onto the subspace

In a previous paper, we proposed a general Fourier method which provides an accurate prediction of the approximation error, irrespective of the scaling properties of the approximating functions. Here, we apply our results when these functions satisfy the usual two-scale relation encountered in dyadic multiresolution analysis. As a consequence of this additional constraint, the quantities introduced in our previous paper can be computed explicitly as a function of the refinement filter. This is in particular

A novel architecture descending from the work of von Neumann, has been developed. This architecture borrows its main principles from living systems. Like living beings, the organisms considered here are able to autonomously develop, maintain their functionality and reproduce. These genomic architectures are developed on reprogrammable hardware. They are not restricted to a given class of functions but accept any combinational and sequential function to be downloaded. These architectures are fault tolerant b

When an injective pseudo-Boolean function f:B^n -> R is minimized, where B^n=0,1^n is the set of vertices of the unit-hypercube, it is natural to consider so-called greedy vertex-following algorithms. These algorithms construct a sequence of neighbouring (Hamming distance 1) vertices with decreasing f-value. The question arises as to when such algorithm will find the global optimum given any starting point. This paper describes a hierarchy of such classes of fonctions that are shown to strictly contain each

Shaft systems of large turbine-generators can be subjected to high torsional stresses due to subsynchronous resonance especially in networks with capacitor- compensated lines. A second benchmark model for computer simulation of this phenomena has been proposed recently [1]. This one, more realistic in actual operation of a power system, permits to compare different analytic methods and simulations realized on this subject. It provides specifically two system configurations as benchmark models:

Evaluating the contribution of system control to the reliability of the power system. II

Chat with Graph Search

Modeling, optimization and experimental assessment of transient-induced fatigue in hydraulic machines

Grid-aware Scheduling and Control of Electric Vehicle Charging Stations for Dispatching Active Distribution Networks. Part-II: Intra-day and Experimental Validation

Variable Duration Movement Encoding with Minimal Intervention Control

Fourier Analysis and Stochastic Processes

Advanced Control of Electrochromic Windows

Operational experience in the use of 18 kA HTS current leads

Feedback Linearizability and Flatness in Restricted Control Systems

SwissCube Inertia Wheel Assembly - Electronics

New Hamiltonian eigensolvers with applications in control

Towards a composition model problem based on IEC61850

Evolution not revolution in the TCV tokamak control and acquisition system

Polymer reaction engineering at EPFL

Sampling—50 Years After Shannon

Quantitative Fourier Analysis of Approximation Techniques: Part II—Wavelets

Embryonics: The Birth of Synthetic Life

From linear separability to unimodality: a hierarchy of pseudo-boolean functions

Results of computer simulation of subsynchronous resonance of synchronous generators