Sökning: "frequency estimation"

Visar resultat 21 - 25 av 272 uppsatser innehållade orden frequency estimation.

1. 21. Dynamic Control, Modeling and Sizing of Hybrid Power Plants : Investigating the optimum usage of energy storage for Fortum’s hydropower

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Klas Lindgren; [2023]
   Nyckelord :Hydropower Plants; Energy Storage Systems; Hybrid Units; Frequency Regulation; Modeling; XGBoost Regression; Vattenkraftverk; Energilagringsystem; Hybridkraftverk; Frekvensreglering; Modellering; XGBoost Regression;

   Sammanfattning : The rapidly evolving Nordic Power System demands enhanced flexibility and robustness in electricity production. The traditional role of hydropower plants in regulating the grid frequency has been challenged by new criteria for dynamic stability, which some units struggle to meet due to their relatively poor dynamic performance. LÄS MER

3. 22. Ingen skillnad i rörelseekonomi mellan modern stakning och gammeldags stakning, trots stora biomekaniska skillnader

   Kandidat-uppsats,

   Författare :Wilma Fjordell; [2022]
   Nyckelord :Cross-country skiing; double poling; vertical displacement; poling cycles; Längdskidåkning; stakning; vertikalförskjutning; stakcykler;

   Sammanfattning : Syfte Undersöka biomekaniska och fysiologiska skillnader mellan modern och gammeldags stakteknik vid konstant submaximalt arbete på rullskidor. Metod Tolv manliga elitskidåkare rekryterades till studien (ålder: 21 ± 4 år, längd: 183,6 ± 9,3 cm, och vikt: 77,8 ± 10,3 kg). LÄS MER

4. 23. Combining Continuous and Event-based Hydrological Modeling in Kävlinge River Basin with HEC-HMS

   Master-uppsats, Lunds universitet/Avdelningen för Teknisk vattenresurslära

   Författare :Wenli Hu; [2022]
   Nyckelord :HEC-HMS; SCS-CN; Climate Change; GIS; Flood; Technology and Engineering;

   Sammanfattning : Prediction of flood and evaluation of the impact of climate change in a catchment needs to be correctly estimated, which can be accomplished by hydrological modelling in HEC-HMS. In this paper, the objectives were to gain an understanding of the rainfall-runoff process and estimate the flood frequency curve in the Kävlinge River Basin. LÄS MER

5. 24. Damping of sub-synchronous control interactions with a STATCOM : Wind farms & series compensated power lines

   Master-uppsats, Uppsala universitet/Institutionen för elektroteknik

   Författare :Leonardo Alvarez Urrutia; [2022]
   Nyckelord :Sub-Synchronous Control Interactions; Power Systems; STATCOM; Network Stability; Doubly-Fed Induction Generator; Impedance-Based Stability Analysis;

   Sammanfattning : The power converter is one of the key components in power system applications such as high voltage direct current (HVDC) systems and the grid connection of intermittent sources such as wind and solar power. However, the increased penetration of converter-based generation introduces challenges, such as sub-synchronous interaction between the converter control system and the grid. LÄS MER

7. 25. Towards Deep Learning Accelerated Sparse Bayesian Frequency Estimation

   Master-uppsats, Lunds universitet/Matematisk statistik

   Författare :Mika Persson; [2022]
   Nyckelord :Bayesian Statistics; Deep Learning; Frequency Estimation; Generative Adversarial Networks; Artificial Neural Networks; Statistical Modelling; Mathematics and Statistics;

   Sammanfattning : The Discrete Fourier Transform is the simplest way to obtain the spectrum of a discrete complex signal. This thesis concerns the case when the signal is known to contain a small (unknown) number of frequencies, not limited to the discrete Fourier frequencies, embedded in complex Gaussian noise. LÄS MER