Sökning: "control or direct"

Visar resultat 16 - 20 av 560 avhandlingar innehållade orden control or direct.

1. 16. Modeling and Control of VSC-HVDC Links Connected to Weak AC Systems

   Författare :Lidong Zhang; Hans-Peter Nee; Alan Wood; KTH; []
   Nyckelord :Control; modeling; multivariable feedback control; HVDC; power systems; stability; subsynchronous torsional interaction; voltage-source converter; weak ac systems;

   Sammanfattning : For high-voltage direct-current (HVDC) transmission, the strength of the ac system is important for normal operation. An ac system can be considered as weak either because its impedance is high or its inertia is low. LÄS MER

3. 17. Synchronous Reluctance Machine (SynRM) in Variable Speed Drives (VSD) Applications

   Författare :Reza Rajabi Moghaddam; Chandur Sadarangani; Alfredo Vagati; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Synchronous Reluctance Machine SynRM ; Torque; Torque Ripple; Design; Optimization; FEM; Control; Standard Size; Measurement; Performance Comparison; Induction Machine IM ; Interior Permanent Magnet Machine IPM ; Variable Speed Drive VSD ; General Purpose GP ; Field Oriented Control FOC ; Direct Torque Control DTC ; Heat Run; Test; Thermal; Operation Diagram; Circle Diagram; Electrical engineering; Elektroteknik;

   Sammanfattning : This thesis is comprehensively dedicated to the theoretical and experimental reevaluation of the Synchronous Reluctance Machine (SynRM). A simple approach to derive the SynRM main characteristics and behavior is followed. An introduction to an evaluation of the different control strategies in is given. LÄS MER

4. 18. Outsourcing of Organizational Routines : Knowledge, control, and learning aspects

   Författare :Elisabeth Kjellström; Företagsekonomiska institutionen; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Organizational routine; knowledge; tacit knowing; control; learning; outsourcing; Organizational routines; knowledge; tacit knowing; control; learning; outsourcing;

   Sammanfattning : Organizational routines that are critical to learning, flexibility, and adaptation explain the behaviour of the business organization. When organizational routines cross the boundary of the organization, variability and stability are affected. LÄS MER

5. 19. Analysis of VSC-based HVDC systems

   Författare :Georgios Stamatiou; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HVDC; MMC; MTDC; Poor damping; Symbolic eigenvalue expressions; Droop control; Passivity Analysis; Net damping; Frequency Domain Analysis; VSC;

   Sammanfattning : The main objective of this thesis is to perform stability and control studies in the area of VSC-HVDC systems. A major part of the investigation focuses on the development of procedures, whose aim is to understand, explain and avoid poorly-damped conditions or instability that may appear due to dc-side resonances, which stem from the interaction of converters and passive elements in such systems. LÄS MER

7. 20. Observer Design and Model Augmentation for Bias Compensation with Engine Applications

   Författare :Erik Höckerdal; Erik Frisk; Tomas McKelvey; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Estimation; observer; bias compensation; diesel engine; EKF; Automatic control; Reglerteknik;

   Sammanfattning : Control and diagnosis of complex systems demand accurate knowledge of certain quantities to be able to control the system efficiently and also to detect small errors. Physical sensors are expensive and some quantities are hard or even impossible to measure with physical sensors. This has made model-based estimation an attractive alternative. LÄS MER