On-line stability constraint assessment for large complex power systems

Power systems around the world are increasingly subject to stability limits. Variation in operating conditions from scenarios used for off-line studies require the adoption of conservative transmission limits. The result is the operation of less economic generation systems leading to unnecessary constraint costs. From an operational perspective, any on-line methods that could identify the generator contributions for a given stability problem and the generation changes required to operate closer to stability limits would be most valuable. This paper presents new developments, which have been carried out at the University of Bath, UK, in the areas of on-line stability constraint cost management for large complex power systems