OICC Press Majlesi Journal of Electrical Engineering 2345-3796 12 2 2024 02 15 Load Frequency Control of an Isolated Power System in Presence of Controllable Energy Storage Devices EN Mallareddy Mounica Department of Electrical and Electronics Engineering, SRKR Engineering College, Bhimavaram, India. Chinta Prasad Department of Electrical and Electronics Engineering, SRKR Engineering College, Bhimavaram, India. D. J. V Prasad Department of Electrical and Electronics Engineering, SRKR Engineering College, Bhimavaram, India M. Aruna Bharathi Department of Electrical and Electronics Engineering, BhojReddy Engineering College for Women, Hyderabad, India Journal Article 2024 02 15 The usage of energy storage units in power system will reduce frequency oscillations immediately subjected to random load changes. In this project, investigations are carried out for an isolated power system with ALFC unit and isolated power system with mutual coupling effects. In each case the effect of different storage units are studied for random load changes. Here particle swarm optimization algorithm (PSO) and improved particle swarm optimization technique (IPSO) are used to tune the parameters of storage units to provide proper control strategy for the system. Instead of using two flexible storage devices, here one flexible storage unit is considered with constant storage system.  Results are carried out in MATLAB/SIMULINK software.