Search for dissertations about: "HVDC control"

Showing result 6 - 10 of 52 swedish dissertations containing the words HVDC control.

2. 6. Fundamental Control Performance Limitations for Interarea Oscillation Damping and Frequency Stability

   Author : Joakim Björk; Karl H. Johansson; Lennart Harnefors; Joe H. Chow; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Power system control; HVDC transmission control; interarea oscillations; power oscillation damping; small-signal stability; fundamental control limitations; frequency stability; hydro power; wind power; non-minimum phase; zero dynamics; eigenvalue analysis; Electrical Engineering; Elektro- och systemteknik;

   Abstract : With the transition towards renewable energy and the deregulation of the electricity markets, the power system is changing. Growing electricity demand and more intermittent power production increase the need for transfer capacity. Lower inertia levels due to a higher share of renewables increase the need for fast frequency reserves (FFR). READ MORE

4. 7. Distributed Control of HVDC Transmission Grids

   Author : Davood Babazadeh; Lars Nordström; Oriol Gomis; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; co-simulation; cyber-physical system; DC slack bus; distributed control; HVDC grids; power injection; topology processor; wind farms; Electrical Engineering; Elektro- och systemteknik;

   Abstract : Recent issues such as priority access of renewable resources recommended by European energy directives and increase the electricity trading among countries lead to new requirements on the operation and expansion of transmission grids. Since AC grid expansions are limited by legislative issues and long distance transmission capacity, there is a considerable attention drawn to application of HVDC transmission grids on top of, or in complement to, existing AC power systems. READ MORE

5. 8. Coordinated Control of HVDC Links in Transmission Systems

   Author : Robert Eriksson; Lennart Söder; Kjetil Uhlen; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; coordinated control; dynamic security; exact-feedback linearization; feedforward control; HVDC poser modulation; Electric power engineering; Elkraftteknik;

   Abstract : Dynamic security limits the power transfer capacity between regions and therefore has an economic impact. The power modulation control of high-voltage direct current (HVDC) links can improve the dynamic security of the power system. READ MORE

6. 9. Operation and control of HVDC links embedded in AC systems

   Author : Jenny Paulinder; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; load voltage dependency; system overload; AC DC interaction; HVDC; voltage instability; control of hvdc converters;

   Abstract : .... READ MORE

7. 10. Modeling and Control of VSC-HVDC Transmissions

   Author : Hector Latorre; Mehrdad Ghandhari; Luis Rouco; KTH; []
   Keywords : Control Lyapunov Functions; Energy Function; Modal Analysis; Transient Stability; Voltage Stability; VSC-HVDC Transmission.; TECHNOLOGY; TEKNIKVETENSKAP;

   Abstract : Presently power systems are being operated under high stress level conditions unforeseen at the moment they were designed. These operating conditions have negatively impacted reliability, controllability and security margins. FACTS devices and HVDC transmissions have emerged as solutions to help power systems to increase the stability margins. READ MORE