Page 37 - Mathematical Models and Algorithms for Power System Optimization
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Daily Economic Dispatch Optimization With Pumped Storage Plant 27
3. If the sum of lower limits of generated output for all units of the plant in various time
periods is within the specified range of the power plant, yet the sum of upper limits of
generated output for all units of the plant in various time periods is larger than the
upper limit of the specified range, such as [450MW, 600MW], the specified range is
reasonable, as shown in Fig. 2.5.
The sum of lower output The sum of upper output
limits of units limits of units
Lower output limit of power plant Upper output limit of power plant
Fig. 2.5
Reasonable range 3 of power plant output.
4. If the sum of upper and lower limits of generated output for all units of the plant in
various time periods is beyond a specified range, such as [550MW, 700MW] or
[50MW, 200MW], the specified is unreasonable. As shown in Fig. 2.6, for the
situation in Fig. 2.6A, the specified upper limit should be enlarged, or some units of
The sum of lower output The sum of upper output
limits of units limits of units
Lower output limit Upper output limit
of power plant of power plant
(A)
The sum of lower output The sum of upper output
limits of units limits of units
Lower output limit Upper output limit
of power plant of power plant
(B)
Fig. 2.6
Unreasonable range of power plant output. (A) Beyond the upper limit; (B) Below the lower limit.
