Fig. 6From: Comparative performance analysis of hybrid differential evolution and pattern search technique for frequency control of the electric power systemSystem response with HVDC link (AC–DC parallel line). a ΔF1 b ΔF2 c ΔPTie\(\left( {\Delta P_{{D1}} = 0.01p.u.MW \& \Delta P_{{D2}} = 0} \right) \). d ΔF1 e ΔF2 f ΔPTie \(\left( {\Delta P_{{D1}} = 0.01p.u.MW \& \Delta P_{{D2}} = 0.02p.u.MW} \right) \)Back to article page