Voltage Instability in Power Systems

The following topics are included:
- Description of phenomena and problem based on recent incidents in the power systems
- Fundamental theory and mechanisms describing voltage stability: static analysis based on load flow equations and nose curves, and dynamic mechanisms as automatic tap-changers and rotating machines.
- Methods for calculation of static stability, reactive power reserves and margins to voltage collapse: load flows, sensitivity analysis, continuation power flows
Methods and techniques from a dynamic perspective: for example load characteristics

To give a deep understanding of the mechanisms contributing to voltage instability and collapse. Also analytical techniques used to study the voltage collapse phenomena will be described.

Colloquiums, written assignments using Matlab as well as self study.
The course is given every second year, next time spring 2009.