Reactive Power and System Frequency Relationship – A Case Study

This paper describes the impact of system frequency on reactive power. The discussion is based on the study of these two important parameters on generator, urban radial load and SVC. In Northern India wide variation in frequency, in the range of 48.5 - 50.2 Hz, is observed against the permissible limit of 49 - 50.5 Hz in the absence of free governor mode of operation (FGMO). Studies show that relation of Reactive power with respect to frequency is negative. One percent increase/decrease in frequency causes 6–12% decrease/increase in Reactive power. To minimize this variation in Reactive power, for better Reactive power management, system stability and voltage control, a tighter frequency band is an urgent need today.