Search for dissertations about: "Current Controller"

Showing result 11 - 15 of 114 swedish dissertations containing the words Current Controller.

2. 11. Grid-forming wind power plants

   Author : Anant Narula; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wind power plants WPPs ; grid-forming GFM ; inertia; Ancillary services; frequency support; coordination; current limitation; energy storage systems ESS ; transient stability;

   Abstract : With growing concerns over climate change, the power system is witnessing an unprecedented growth in electricity generation from intermittent renewable energy sources (RES) such as wind and solar, which are commonly interfaced to the grid by power-electronic converters. However, increasing the penetration level of converter-interfaced generation units reduces the number of synchronous generators (SGs) in the grid that provide system services to support voltage and frequency, either inherently or through mandatory requirements and market products. READ MORE

4. 12. On the Internal Dynamics and AC-Motor Drive Application of Modular Multilevel Converters

   Author : Antonios Antonopoulos; Hans-Peter Nee; Lennart Harnefors; Hirofumi Akagi; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Capacitor-Voltage Control; Controller Interaction; Converter Control; Energy Balance; Lyapunov Stability; Medium-Voltage Drives; Modular Multilevel Converter; Modulation; Open-Loop Control; Optimization; Variable-Speed Drives; Voltage-Source Converter.; Energibalans; Kondensatorspänningsstyrning; Lyapunov-stabilitet; Mellan-spänning drivsystem; Modulation; Modulär multinivåomvandlare; Omvandlarstyrning; Optimering; Regulatorväxelverkan; Spänningsstyva omvandlare; Varvtalsstyrda motordrifter; Öppen styrning.; Electrical Engineering; Elektro- och systemteknik;

   Abstract : This thesis is an effort to investigate the operation and the performanceof modular multilevel converters (M2Cs). Proven to be the most promisingtopology in high-voltage high-power applications, it is necessary to put aneffort in understanding the physical laws that govern the internal dynamicsof such converters, in order to design appropriate control methods. READ MORE

5. 13. Resource Allocation for Data-Intensive Services in the Cloud

   Author : David Daharewa Gureya; Vladimir Vlassov; Joao Pedro Barreto; Gregory Chockler; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Cloud computing; QoS-aware resource allocation; Elasticity controller; Multi-socket systems; Non-uniform memory access; Page placement; Memory-intensive applications; Informations- och kommunikationsteknik; Information and Communication Technology;

   Abstract : Cloud computing has become ubiquitous due to its resource flexibility and cost efficiency. Resource flexibility allows Cloud users to elastically scale their Cloud resources, for instance, by horizontally scaling the number of virtual machines allocated to each application as the application demands change. READ MORE

6. 14. Grid-Connected Voltage Source Converter - Control Principles and Wind Energy Applications

   Author : Jan Svensson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wind turbine; voltage source converter; voltage angle control; frequency response; vector current control; grid-connected; forced-commutated; measurements;

   Abstract : The thesis focuses on a forced-commutated voltage source converter (VSC) connected to a grid in a wind energy application. The work consists of four parts. The first part addresses the type of electrical system which should be used in a wind turbine. READ MORE

7. 15. Distributed control of electric drives via Ehernet

   Author : Lilantha Samaranayake; KTH; []
   Keywords : Brushless DC Motor; Control Delay; Distributed Motion Control Systems; Proportional Integral Controller;

   Abstract : This report presents the work carried out aiming towardsdistributed control of electric drives through a networkcommunication medium with temporal constraints, i.e, Ethernet.A general analysis on time delayed systems is carried out,using state space representation of systems in the discretetime domain. READ MORE