This paper presents a suitable mathematical model of Hydro-Thermal (H-T), Wind-Diesel (W-D) and Combined Cycle Gas Turbine (CCGT) system under deregulated environment. The variable power consumption as well as intermittent load variation may cause large fluctuations on system frequency. To reduce the system oscillations Superconducting Magnetic Energy Storage (SMES) and Capacitive Energy Storage (CES), which will supply and absorb active, reactive powers quickly, can be applied. In addition, variation of system parameters, load and unpredictable power demands cause various uncertainties in the system. Energy storage devices so far designed without considering such uncertainties may lose control effect. To enhance the robustness of storage devices, this paper focuses on a new SMES and CES robust frequency controllers are designed for three area power system. The coprime factorization method is used to represent the unstructured uncertainties in a system modeling. The structure of SMES and CES controller are the practical first order lead/lag compensator. To tune the controller parameters, the optimization problem is formulated based on loop shaping technique. The particle swarm optimization (PSO) is applied to solve the problem to achieve the controller parameters and also to optimize the Integral Controllers of three area power system in deregulated environment.