Fig. 7From: Comparative performance analysis of hybrid differential evolution and pattern search technique for frequency control of the electric power systemSystem response \(\left( {\Delta P_{{D1}} = 0.01p.u.MW\& \Delta P_{{D2}} = 0} \right) \) with HVDC link. a Deviation in generated powers in thermal power plant. b Change in generated powers in hydro power plant. c Change in generated powers in gas power plantBack to article page