Optimal generation scheduling of thermal units with considering startup and shutdown ramp limits

This paper presents a generation scheduling of thermal units considering startup and shutdown ramp limits by using Shuffled Frog Leaping Algorithm. TheStartup and shutdown ramp limits are does not consider in the conventional method of unit commitment (UC). Without considering the ramp limits in generation scheduling problem, solution for large power system does not give practical value. The objective of proposed work is to determine the optimal committed of thermal generating units at minimum operating cost while considering load demand, spinning reserve and otherequality and inequality constraints at each hour time interval. The solution obtained from the proposed Shuffled Frog Leaping Algorithm(SFLA) for four unit system is compared with other conventional methods.