A survey of hybrid energy storage systems applied for intermittent renewable energy systems

Hybrid Energy Storage Systems (HESS) draws more attention to electrical power generation systems from renewable energy resources as they can solve problems of fluctuated power created by intermittent energy sources (PV/Wind/Wave). Moreover, the HESS can minimize and smoothen out demand and supply mismatch of energy. This paper is a survey of the HESS applied for renewable energy sources. The structure of HESS based on combining of electrical storage devices and electrochemical energy storage is comparatively studied. The evaluation on capital cost, power rating and characteristic of storage devices results in an optimum combination of the Magnetic Energy Storage (SMES) with battery and Super Capacitor (SC) with battery. The mixture of the SMES with battery is appropriate for power generation system with high power penetration, such as wind power generation. However, the combination of SC with battery is suitable for the lower power penetration system such as a solar PV generation system.