Sökning: "overvoltage"

Visar resultat 16 - 20 av 26 uppsatser innehållade ordet overvoltage.

1. 16. Batterimatning som reservdrift på mellanspänningsnätet

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för teknikvetenskaper

   Författare :Johanna Högerås; [2017]
   Nyckelord :Batterilager; batterireserv; batterilagring; batterimatning; mellanspänning; mellanspänningsnätet; lokalnät; MSP; reservdrift; reservmatning; n-1; eldistribution;

   Sammanfattning : The grid in the northern part of Sweden is characterized by long radial lines with just a few customers. To secure electricity supply it is necessary to have a redundant feeding alternative. LÄS MER

3. 17. Hosting Capacity of a Low-Voltage Grid : Development of a Simplified Model to be used in future Solar Roadmaps

   Kandidat-uppsats, Uppsala universitet/Institutionen för teknikvetenskaper

   Författare :Jonas Andersson; Vendela Bernström; Joacim Törnqvist; [2017]
   Nyckelord :solar roadmap; hosting capacity; PV power; PV system; overvoltage; low-voltage grid; self-consumption;

   Sammanfattning : The purpose of this bachelor thesis is to assess whether it is possible to create a simplified model that estimates the hosting capacity of a low-voltage grid. The Simplified model is compared with a more elaborate model created by the Built Environment Energy Systems Group (BEESG) at Uppsala University. LÄS MER

4. 18. Definition of New Critical Distances for Transformers Re-energization during a Black Start

   Master-uppsats, KTH/Elektroteknisk teori och konstruktion

   Författare :Valerian Bayle; [2017]
   Nyckelord :;

   Sammanfattning : This study aims to find new critical distances for transformer re-energization during network restoration after a blackout. Energizing a power transformer, in a grid that is lightly loaded due to the restoration process, involves a risk of temporary harmonic overvoltage. LÄS MER

5. 19. Impact Study: Photo-voltaic Distributed Generation on Power System

   Master-uppsats, Mälardalens högskola/Akademin för ekonomi, samhälle och teknik

   Författare :Smrutirekha Sahoo; [2016]
   Nyckelord :DC-AC inverter; DC-DC boost converter; Dynamic PV model; Grid-connected PV system; Harmonic distortion; LV grid-modelling; Overvoltage; THD; Voltage unbalancing; VSI;

   Sammanfattning : The grid-connected photo-voltaic (PV) system is one of the most promising renewable energy solutions which offers many benefits to both the end user and the utility network and thus it has gained the popularity over the last few decades. However, due to the very nature of its invariability and weather dependencies, the large scale integration of this type of distributed generation has created challenges for the network operator while maintaining the quality of the power supply and also for reliable and safe operations of the grids. LÄS MER

7. 20. Probabilistic Approach to InsulationCoordination

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära

   Författare :Alexander Bilock; [2016]
   Nyckelord :VSC-HVDC; KDE; Insulation coordination;

   Sammanfattning : The present work was performed at HVDC ABB as an initial study on how to adopt probabilistic concepts into the VCSHVDC insulation coordination. Due to large voltage levels in HVDC applications the corresponding insulation need to be properly addressed to ensure a safe, economical and reliable operation. LÄS MER