Sökning: "weak grid"
Visar resultat 1 - 5 av 19 avhandlingar innehållade orden weak grid.
1. Converter Interfaced Distributed Generation - Grid Interconnection Issues
Sammanfattning : Distributed generation (DG) with a converter interface to the grid is found in many of the green power resources applications. In this thesis, the control of a voltage source converter (VSC), as the DG front end, is in focus regarding the power quality problems that could appear at the connection point. LÄS MER
2. On Power Electronics Interface for Distributed Generation Applications and its Impact on System Reliability to Customers
Sammanfattning : Distributed generation (DG) is being employed as a means of achieving increased reliability for electrical power systems as regarded by consumers. As the most of DG technologies utilize renewable sources, the power electronic interface plays a vital role to match the characteristics of a DG unit with the grid requirements. LÄS MER
3. Fault Behavior of Wind Turbines
Sammanfattning : Synchronous generators have always been the dominant generation type in the grid. This fact affected both planning and operation of power systems. With the fast increase of wind power share in the grid in the last decade, the situation is changing. In some countries wind power represents already a consistent amount of the total generation. LÄS MER
4. Weak Boundary and Interface Procedures for Wave and Flow Problems
Sammanfattning : In this thesis, we have analyzed the accuracy and stability aspects of weak boundary and interface conditions (WBCs) for high order finite difference methods on Summations-By-Parts (SBP) form. The numerical technique has been applied to wave propagation and flow problems. LÄS MER
5. Nyquist Stability Analysis of a VSC-HVDC System with a Distributed Parameter DC-cable Model
Sammanfattning : Voltage source converter based high voltage direct current (VSC-HVDC) transmission systems have now been in operation since 1997 as it is a reliable and flexible method of power transmission. This thesis focuses on small signal dynamics of such systems, emphasizing stability properties. LÄS MER