6 Effect of power imbalance on system frequency

There will be a frequency drop or increase depending

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there will be a frequency drop or increase (depending on the sign of the change). The kinetic energy of rotation is given by, 2 1 2 e m k I ω = Then the change ratio of the kinetic energy with respect to time is equal to the power misbalance. e m m mech elec dk d I P P dt dt ω ω = = Hence if dk e /dt = 0 then k e is constant ( 0 e k ). The demand of power in MW versus time varies during the day as exemplified in Figure 3 Figure 3 - Demand vs. Time The mismatch between the electrical and the mechanical power causes a frequency variation over time. Figure 4 - Frequency vs. Time
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