Fig. 11From: A new two-degree of freedom combined PID controller for automatic generation control of a wind integrated interconnected power systemImprovement in responses with the combined controller during simultaneous load change (as shown in Fig. 12) and wind disturbances (+ 6% at 20 s and − 12% at 40 s). (a): frequency deviations of area I; (b): frequency deviations of area II; (c): tie line power changesBack to article page