Wind Power Plant Transmission System Modelling for Harmonic Propagation and Small-signal Stability Analysis

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Emlékállítás és felejtés. A „málenkij robot” emlékezete a szatmári sváboknál

Commemorative practices and oblivion mechanism. The memory of the deportations of the Satu Mare Swabians) In 1945, a series of violent events took place, bringing the greatest individual and collective trauma in the history of the Satu Mare Swabians. The paper presents the various communication situations in which deportation narratives were drafted and transmitted. I wanted to reveal all the channels in which the commemoration of the deportations (both private and public) took/take place, paying special attention to changes in commemoration forms, as historical phenomena, and also making a comparison between the approaches in the Swabian villages from Romania and Hungary. In commemorating practicesof the deportations I distinguished four levels: individual memory, memory of generations, communicative memory and collective memory, all four having different functions and contexts

The Low Emission Oil and Gas Open reference platform—An off-grid energy system for renewable integration studies

The data that support the findings of this study are openly available in Zenodo at https://doi.org/10.5281/zenodo (7373223)This article introduces and describes the integrated energy system of the Low Emission Oil and Gas Open reference platform. It is a hypothetical case meant to represent a typical oil and gas installation in the North Sea. The aim of this detailed specification is to serve as an open reference case where all the information about it can be publicly shared, facilitating benchmarking and collaboration. The relevance of this reference case of an off-grid energy system is not limited to the oil and gas industry, since it can also be seen as a special kind of electrical micro grid. The remote offshore location makes it especially relevant for studying offshore wind power and ocean energy sources like wave power. The specification has an emphasis on the energy system and electrical configuration, but also includes a basic description of the oil field and processing system. The intention is that it will serve as a basis for energy system studies and relating power system stability analyses regarding the integration of renewable energy sources. This allows for comparisons of a base case with different design modifications, new operational planning methods, power management strategies and control concepts. Examples of possible modifications are the replacement of gas turbines by wind turbines, addition of energy storage systems, a more variable operation of loads etc. The last part of the article demonstrates the behaviour of the reference platform implemented in two software tools: one for operational planning and one for dynamic power system analyses.publishedVersio

Operational Planning and Power Management System for Offshore Platform With Wind Energy Supply – Impacts on CO2 Reduction and Power Quality

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An Electromechanical Model of the TotalControl Reference Wind Power Plant

An electromechanical model of the TotalControl Reference Wind Power Plant has been built. This is based on SINTEF's STAS software, for the system dynamics and control of wind power plants. An overview is given of the theory behind the STAS software, and the architecture of the system model. A wind turbine control system has been designed, which is well-suited to the STAS model and the upcoming research on plant control algorithms in the TotalControl project. The STAS model consists of linear/nonlinear equation pairs, and it is shown how these can be used to obtain Newton-Raphon solutions for operating points, as well as precise gradients with the complex step approach. A procedure for scaling stochastic atmospheric turbulence is presented, that greatly accelerates design and optimization studies involving turbulent wind fields. The detailed electrical design of the TotalControl Reference Wind Power Plant is described, and this is applied together with the wind turbine module to construct a holistic electromechanical model of the plant. The dynamics of the plant is characterized in terms of transfer functionsAn Electromechanical Model of the TotalControl Reference Wind Power PlantpublishedVersio

Resonance Characteristics in Offshore Wind Power Plants with 66 kV Collection Grids

This paper presents a study of the influence of doubling the collection grid voltage on the electric resonances in the collection grid of large offshore wind power plants. This was done using wide-band models of most important passive components such as transformers and cables. Wide-band models based on measurements (black box) of transformers were used. Scaling of admittance matrix elements was used in order to adjust the voltage ratio of the measured wind turbine transformers to take into account the doubled voltage at the medium voltage side. It was shown that doubling the collection grid voltage decreases the main resonance frequency seen at the medium voltage terminal of the wind turbine transformers as well as the offshore substation transformer. The decrease was approximately 25 per cent when doubling the voltage and keeping the same number of turbines in a radial. When the number of turbines was doubled, there was a proportional decrease of the resonance frequency. Decreasing the main resonance frequency in offshore wind power plants might have an impact on the harmonic and transient behaviour and should therefore be investigated by develope