In the present work, the undertaken power system (PS) is isolated hybrid wind–diesel PS (IHWDPS) consists of a generator based on wind turbine (GWT), a generator based on diesel engine (GDE) and an energy storing device (ESD) (for instance, capacitive energy and storage). In the present paper, an indicative analysis of frequency control also with power control for the considered IHWDPS using proportional–integral–derivative (PID) controller and cascaded PID controller aims to govern the pitch of GWT and to govern the speed governor of GDE. The controller gains have been tuned using quasi-oppositional harmony search (QOHS). The dynamic simulation reaction compression indicates that superior enactment may be recorded with cascaded PID controller over the PID controller while exposed to dissimilar perturbation. The results obtained disclose that the optimized gains of the cascaded PID controller offered with QOHS algorithm are robust in nature and do not requires resetting for extensive range for perturbations in the system.