Assessing the value of generator reactive power support for transmission access

The new electricity markets consider reactive power support as an essential system support service. In order to procure reactive support competitively from the markets, one needs to quantify the value of the various VAr sourc es available in the system. Research results are presented oil the developm ent of concepts and methodologies for equitable reactive power support valu ation. Contribution to system security improvement is the main consideratio n for assessing the relative values of the VAr sources. The dynamic VAr sup port from generators is of much greater importance in the value assessment. A simple system is used first to demonstrate and define the problem. A sol ution method is proposed along with case study results on a large-scale pow er system.