Cold Load Pickup Model Adequacy for Power System Restoration Studies

When a grid section is re-energized after an interruption, the load behaviour can be significantly different from normal operation. In this manuscript, the impact of the phenomenon—known as cold load pickup—is investigated by evaluating 31 time series measured after network outages in Austria and Germany. Its impact on power system restoration and the adequacy of the most common type of simplified model for such investigations is assessed by the time domain simulation of a restoration setting involving the parallel operation of conventional and renewable generation. Parameter distributions are provided for the exponential decay and the delayed exponential decay model with the aim of facilitating meaningful consideration of the phenomenon in time domain simulations of power system restoration. The benefits and limitations of these models are assessed by comparison of time domain simulation results using either the normalized raw data, an exponential decay model or a step-wise active power chance to reflect load behaviour. It is shown that using an exponential decay model leads to higher fidelity of simulation results with respect to the resulting steady-state active power sharing among generators than just applying a step-wise power change in the simulation

Research & Innovation: Which priorities for structural funds in Luxembourg

It is a key aim of the EU2020 strategy and of the Luxembourg government to promote research and innovation (“smart growth”). The 2014-2020 programming period of the Structural Funds offers an opportunity to support projects in this field at national, cross-border and transnational levels. This leaflet synthesises the results of a consultation process organised by the ESPON Contact Point of Luxembourg in summer and autumn 2013 in the framework of the USESPON project. First, it aimed at analysing the relevance of ESPON results in the field of research, development and innovation (RDI) in Luxembourg. Second, this process reflected on possible priorities for the future operational programmes of the structural funds. This process involved either experts in the field of RDI or those responsible for drafting operational programmes. The consultation process has been framed by a Delphi technique. First, participants received “support material” presenting the situation of Luxembourg according to the ESPON results. Second, they participated in a workshop on 11th July 2013. Third, a synthesis based on the results of the workshop was provided together with a questionnaire giving the experts the opportunity to deepen and concretise their contribution. By summarising this consultation process, this leaflet aims at 1) working out a profile of Luxembourg on the basis of ESPON results in the field of RDI and 2) developing recommendations of how future-oriented innovation strategies can be implemented in the context of European Territorial Cooperation. The final version of this document was published on the ECP Luxembourg website in autumn 2013

Cold Load Pickup Model Adequacy for Power System Restoration Studies

Gefördert durch den Publikationsfonds der Universität Kasse

Asymmetric Contributions to Instantaneous Reserve by Generation, Loads, and Storage

This article is the English version of the originally published German article. Deutsche Version dieses Artikels: doi:10.17170/kobra-202202015686.PtJ FKZ 0350023C and 0350048

Unsymmetrische Beiträge zur Momentanreserve durch Erzeugung, Verbrauch und Speicher

Dies ist die deutsche Version des Artikels, wie im Tagungsband erschienen. English version of this article: doi:10.17170/kobra-202202015687PtJ FKZ 0350023C und 0350048

Signature Rollback -- A Technique for Testing Robust Circuits

Dealing with static and dynamic parameter variations has become a major challenge for design and test. To avoid unnecessary yield loss and to ensure reliable system operation a robust design has become mandatory. However, standard structural test procedures still address classical fault models and cannot deal with the non-deterministic behavior caused by parameter variations and other reasons. Chips may be rejected, even if the test reveals only non-critical failures that could be compensated during system operation. This paper introduces a scheme for embedded test, which can distinguish critical permanent and noncritical transient failures for circuits with time redundancy. To minimize both yield loss and the overall test time, the scheme relies on partitioning the test into shorter sessions. If a faulty signature is observed at the end of a session, a rollback is triggered, and this particular session is repeated. An analytical model for the expected overall test time provides guidelines to determine the optimal parameters of the scheme

Teaching, learning and technology during the Corona pandemic: Introduktion til Læring og Medier (LOM) nr. 24, 2021

Indledning Præsentation af temanummerets artikler Et blik mod horisonten Hvad blev vi ikke klogere på?Introduction Presentation of the articles in LOM no. 24 Looking to the horizon What did we not learn

Unterstützung des Netzwiederaufbaus durch Ausregelung der dezentralen Erzeugung im Verteilnetz

Bundesministerium für Wirtschaft und Energie / Projektträger Jülich, Projekt NETZ:KRAFT (FKZ 032577