Frequency Control in Emergency Conditions
Following a large generation loss disturbance, a power system’s frequency may drop quickly if the remaining generation no longer matches the load demand. Significant loss of generating the plant without adequate system response can produce extreme frequency excursions outside the working range of plant. As mentioned in Chaps. 1 and 2, large frequency deviations can degrade load performance, overload transmission lines and even lead to system collapse.
Depending on the size of the frequency deviation experienced, emergency control and protection schemes may be required to maintain power system frequency. One method of characterizing frequency deviations experienced by a power system is in terms of the frequency deviation ranges and related control actions shown in Table 2.3. The frequency variation ranges (Δf1, Δf2, Δf3 and Δf4), shown in the table, are identified in terms of different power system operating conditions. The small frequency deviations (Δf1 and Δf2) can be attenuated by...
KeywordsPower System Power Flow System Frequency Emergency Control Frequency Gradient
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