Discussion of “Continuous quick group search optimizer for solving non-convex economic dispatch problems” by Moradi-Dalvand et al. [Electr. Power Syst. Res. 93 (2012) 93–105]

This short communication presents a discussion of “Continuous quick group search optimizer for solving non-convex economic dispatch problems” by Moradi-Dalvand et al. [Electr. Power Syst. Res.] 93 (2012) 93–105. The discussed paper presented economic dispatch problem by experimenting with five example systems considering 6, 10, 20, 40 and 140-unit test systems considering non-convex cost function with valve point loading effects, multi-fuel effects and prohibited operating zones. However, in the reported results for the 6 and 20-unit test system, the total generation, total loss and the cost quoted were different for the given generation schedule. In this communication, the corrected data of the 6-unit test system and clarification regarding power transmission losses and cost calculations are presented.

► B matrix data for loss calculation and cost function formulation of the test system I are corrected.
► This paper clarifies the total generation and cost calculations for 6 and 20-unit test system.
► Solutions of test system I and III cannot measure the effectiveness of the GSO and CQGSO algorithms.