Discussion of “Hybrid Differential Evolution With Biogeography-Based Optimization for Solution of Economic Load Dispatch”

We commend the authors of for application of an interesting optimization methodology to solve economic dispatch problem. Their discussion presents a hybrid technique combining differential evolution with the biogeography-based optimization (DE/BBO) algorithm to solve both convex and nonconvex economic load dispatch (ELD) problems of thermal power units considering transmission losses, and constraints such as ramp-rate limits, valve-point loading, and prohibited operating zones (POZ). The proposed DE/BBO algorithm has been applied to solve ELD problems in four different test cases to verify its feasibility. In the test Case 1 of the paper, the authors examined a three-generator test system with ramp rate limit and prohibited operating zone constrains, as explained well in the paper.