Correlation and comparison between bus participation factor and voltage sensitivity factor for simultaneous and individual bus load change in multi bus power system

In heavily loaded systems, voltage stability limit is usually dominant and voltage instability is usually observed following large disturbance. This is typically the case in the deregulated environment as the transmission systems are operating under more stressed condition due to increased transaction level associated with open access. Sufficient attention to voltage stability in deregulated system is not paid as compared to angle stability. More attention is required to be paid to keep voltage profile and hold the voltage stability under control. There are various methods for voltage stability analysis in the literature. In this paper simple voltage stability analysis is carried out for a multi bus power system (IEEE 14 Bus System) using V-Q Sensitivity analysis and modal analysis. A software code is specially written which allows increasing the load on the selected buses simultaneously as well as individually. The changes in V-Q sensitivity and bus participation is studied with simultaneous load increase on the group of buses compared with individual bus load increase. Also the correlation between the voltage sensitivity factor and bus participation factor is established.